CN117843171A - Cultivation sewage denitrification method and system - Google Patents
Cultivation sewage denitrification method and system Download PDFInfo
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- CN117843171A CN117843171A CN202311871966.8A CN202311871966A CN117843171A CN 117843171 A CN117843171 A CN 117843171A CN 202311871966 A CN202311871966 A CN 202311871966A CN 117843171 A CN117843171 A CN 117843171A
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- 238000000034 method Methods 0.000 title claims abstract description 36
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- 208000028659 discharge Diseases 0.000 claims description 23
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- 238000001556 precipitation Methods 0.000 claims description 12
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/043—Treatment of partial or bypass streams
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The application discloses a method and a system for denitrification of culture sewage, comprising the steps of carrying out solid-liquid separation treatment on the culture sewage discharged by a farm to obtain separated first-stage sewage; anaerobic fermentation treatment is carried out on the first-stage sewage to obtain second-stage sewage; first mixing the second-stage sewage and the first split sewage of the first-stage sewage to obtain a first mixed solution, and performing primary anaerobic-aerobic treatment on the first mixed solution to obtain primary denitrification effluent; and carrying out second mixing on the first-stage denitrification effluent and the second split sewage of the first-stage sewage to obtain a second mixed solution, and carrying out second-stage anaerobic and aerobic treatment on the second mixed solution to obtain second-stage denitrification effluent. The cultivation sewage denitrification method and system provided by the application have the advantages of high denitrification efficiency, low operation cost and the like.
Description
Technical Field
The present application relates generally to the field of aquaculture wastewater treatment technology. More particularly, the present application relates to a method and system for denitrification of aquaculture wastewater.
Background
This section is intended to provide a background or context for embodiments of the present application that are recited in the claims. The description herein may include concepts that could be pursued, but are not necessarily ones that have been previously conceived or pursued. Accordingly, unless indicated otherwise, what is described in this section is not prior art to the description and claims in this application and is not admitted to be prior art by inclusion in this section.
In livestock farms, particularly large-scale livestock farms, a large amount of cultivation sewage containing animal manure, animal feed, colony flushing water and the like is produced every day, and the cultivation sewage contains high-concentration organic matters, pathogens, nitrogen, phosphorus and other pollutants, and the content of organic pollutant indexes COD (Chemica lOxygen Demand ), ammonia nitrogen and the like is hundreds of times that of common domestic sewage, so that the treatment difficulty is high and the standard emission is difficult to realize.
The related technology at present adopts the technologies such as an AO treatment technology (anaerobic and aerobic treatment technology) to treat the cultivation sewage so as to remove COD (Chemica lOxygen Demand ), TN (total nitrogen), TP (total phosphorus) and the like in the cultivation sewage, but the treatment mode needs additional carbon source, and has the problems of high treatment cost, low denitrification efficiency, poor denitrification stability and the like, so that the further development of a large-scale livestock farm is restricted to a certain extent. In view of the foregoing, there is a need for a method for denitrification of aquaculture wastewater that is low in treatment cost and high in denitrification efficiency.
Disclosure of Invention
In order to solve at least one or more of the technical problems mentioned above, the present application proposes, in various aspects, a method and system for denitrification of aquaculture wastewater.
In a first aspect, the present application provides a method of denitrification of aquaculture wastewater. The method comprises the following steps: carrying out solid-liquid separation treatment on the culture sewage discharged by the farm to obtain first-stage sewage; anaerobic fermentation treatment is carried out on the first-stage sewage to obtain second-stage sewage; first mixing the second-stage sewage and the first split sewage of the first-stage sewage to obtain a first mixed solution, and performing primary anaerobic-aerobic treatment on the first mixed solution to obtain primary denitrification effluent; and carrying out second mixing on the first-stage denitrification effluent and the second split sewage of the first-stage sewage to obtain a second mixed solution, and carrying out second-stage anaerobic and aerobic treatment on the second mixed solution to obtain second-stage denitrification effluent.
In an alternative, the primary anaerobic-aerobic treatment comprises: performing first denitrification treatment on the first mixed solution to obtain a first denitrification solution; performing first nitrification treatment on the first denitrification liquid to obtain a first nitrified liquid; performing first precipitation treatment on the first nitrifying liquid to obtain first-stage denitrification effluent and a first precipitate, wherein the carbon-nitrogen ratio of the first mixed liquid is greater than or equal to 7; the secondary anaerobic-aerobic treatment comprises: performing a second denitrification treatment on the second mixed solution to obtain a second denitrification solution; performing a second nitrification treatment on the second denitrification liquid to obtain a second nitrified liquid; and performing second precipitation treatment on the second nitrifying liquid to obtain second-stage denitrification effluent and second precipitate, wherein the carbon-nitrogen ratio of the second mixed liquid is greater than or equal to 5.
In an alternative, the primary anaerobic-aerobic treatment further comprises: the first nitrifying liquid is refluxed into the first mixed liquid according to a first internal reflux ratio which is greater than or equal to 8, wherein the first internal reflux ratio is the ratio of the reflux first nitrifying liquid flow rate to the first mixed liquid flow rate; and refluxing the first precipitate into the first mixed liquid according to a first external reflux ratio, wherein the first external reflux ratio is the ratio of the refluxed first precipitate flow to the first mixed liquid flow, and is greater than or equal to 1; the secondary anaerobic-aerobic treatment further comprises: refluxing the second nitrifying liquid into the second mixed liquid according to a second internal reflux ratio, wherein the second internal reflux ratio is greater than or equal to 8, and the second internal reflux ratio is the ratio of the flow rate of the refluxed second nitrifying liquid to the flow rate of the second mixed liquid; and refluxing the second precipitate into the second mixed liquid according to a second external reflux ratio, wherein the second external reflux ratio is greater than or equal to 1, and the second external reflux ratio is the ratio of the flow rate of the refluxed second precipitate to the flow rate of the second mixed liquid.
In an alternative, the first mixed liquor has a ph in the range of 7.45-7.54; the pH value of the first nitrifying liquid ranges from 7.25 to 7.34; the ph value of the second mixed solution ranges from 7.25 to 7.34; and the ph value of the second nitrifying liquid ranges from 7.05 to 7.14.
In an alternative, the method further comprises: performing third precipitation treatment on the second-stage denitrification effluent to obtain third-stage effluent; and storing the sediment generated by the solid-liquid separation treatment, anaerobic fermentation treatment, primary anaerobic-aerobic treatment and/or secondary anaerobic-aerobic treatment.
In a second aspect, the present application provides a aquaculture wastewater denitrification system. The aquaculture sewage denitrification system comprises: the solid-liquid separation device is used for carrying out solid-liquid separation on the culture sewage discharged by the farm to obtain first-stage sewage; the anaerobic fermentation device is used for carrying out anaerobic fermentation on the first-stage sewage to obtain second-stage sewage, and the anaerobic fermentation device is connected with the solid-liquid separation device; the first-stage anaerobic and aerobic treatment device is connected with the solid-liquid separation device and is used for carrying out first mixing on the second-stage sewage and the first split sewage of the first-stage sewage to obtain a first mixed solution, and carrying out first-stage anaerobic and aerobic treatment on the first mixed solution to obtain first-stage denitrification effluent; the second-stage anaerobic-aerobic treatment device is connected with the first-stage anaerobic-aerobic treatment device and is used for carrying out second mixing on the first-stage denitrification effluent and the second split sewage of the first-stage sewage to obtain a second mixed solution, and carrying out second-stage anaerobic-aerobic treatment on the second mixed solution to obtain second-stage denitrification effluent; the discharge treatment device is connected with the secondary anaerobic-aerobic treatment device and is used for carrying out third precipitation treatment on the secondary denitrification effluent to obtain third-stage effluent; and the sedimentation treatment device is connected with the solid-liquid separation device, the anaerobic fermentation device, the primary anaerobic-aerobic treatment device, the secondary anaerobic-aerobic treatment device and/or the discharge treatment device and is used for storing sediments generated by the solid-liquid separation device, the anaerobic fermentation device, the primary anaerobic-aerobic treatment device, the secondary anaerobic-aerobic treatment device and/or the discharge treatment device.
In an alternative, the primary anaerobic-aerobic treatment device includes: the first-stage denitrification tank is used for carrying out denitrification treatment on the first mixed liquid to obtain first denitrification liquid; the first-stage nitrification tank is connected with the first-stage denitrification tank and is used for nitrifying the first denitrification liquid to obtain a first nitrified liquid; the first-stage sedimentation tank is connected with the first-stage nitrification tank and is used for carrying out sedimentation treatment on the first nitrified liquid to obtain first-stage denitrification effluent and a first sediment; the secondary anaerobic-aerobic treatment device comprises: the second-stage denitrification tank is connected with the first-stage sedimentation tank and is used for carrying out denitrification treatment on the second mixed liquid to obtain a second denitrification liquid; the secondary nitrification tank is used for nitrifying the second denitrification liquid to obtain a second nitrification liquid, and the secondary nitrification tank is connected with the secondary denitrification tank; and the secondary sedimentation tank is connected with the secondary nitrification tank and is used for carrying out sedimentation treatment on the second nitrifying liquid to obtain the secondary denitrification effluent and a second sediment.
In an alternative, the solid-liquid separation device includes: a filter tank for removing floaters in the culture sewage; the solid-liquid separation unit is connected with the filter tank and is used for carrying out solid-liquid separation treatment on the culture sewage; the buffer tank is connected with the solid-liquid separation unit and is used for temporarily storing the first-stage sewage to meet the intermittent water storage requirement of starting and stopping the water outlet pump; the anaerobic treatment device comprises: the anaerobic fermentation unit is connected with the buffer tank and is used for carrying out anaerobic fermentation on the first-stage sewage; the primary sedimentation tank is connected with the anaerobic fermentation unit and the primary denitrification tank and is used for storing the second-stage sewage; the emission treatment device includes: the final sedimentation tank is connected with the secondary sedimentation tank and is used for carrying out third sedimentation treatment on the secondary denitrification effluent to obtain the third-stage effluent; and a discharge tank connected to the final sedimentation tank and for temporarily storing the third stage effluent.
In an alternative, the sedimentation treatment device comprises a sedimentation storage tank connected to the sludge tank, buffer tank, anaerobic fermentation unit, primary sedimentation tank, primary denitrification tank, primary sedimentation tank, secondary denitrification tank, secondary sedimentation tank and/or final sedimentation tank and used for storing the sediment.
In an alternative, the sedimentation treatment device further comprises a sedimentation treatment unit connected to the sedimentation reservoir.
By adopting the culture sewage denitrification method and the culture sewage denitrification system provided by the invention, a person skilled in the art can understand that the culture sewage denitrification method and the culture sewage denitrification system provided by the application adopt the primary anaerobic and aerobic treatment and the secondary anaerobic and aerobic treatment on the culture sewage, and part of the culture sewage is used as an added carbon source, so that the additional purchase of the added carbon source is not needed, the denitrification efficiency of the culture sewage is effectively improved, and the cost of sewage treatment is greatly reduced.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present application will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. Several embodiments of the present application are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:
FIG. 1 illustrates a aquaculture wastewater denitrification system according to an embodiment of the present application;
FIG. 2 shows a primary anaerobic-aerobic treatment device and a secondary anaerobic-aerobic treatment device according to an embodiment of the present application;
FIG. 3 illustrates a aquaculture wastewater denitrification system according to another embodiment of the present application;
FIG. 4 illustrates an exemplary flow chart of a method of denitrification of aquaculture wastewater according to an embodiment of the present application.
Reference numerals illustrate:
1. a cultivation sewage denitrification system; 11. a solid-liquid separation device; 12. an anaerobic fermentation device; 13. a primary anaerobic-aerobic device; 131. a primary denitrification tank; 132. a primary nitrification tank; 133. a first-stage sedimentation tank; 14. a secondary anaerobic-aerobic device; 141. a secondary denitrification tank; 142. a secondary nitrification tank; 143. a secondary sedimentation tank; 15. an emission treatment device; 16. a sedimentation treatment device; a1, first split sewage, a2 and second split sewage; b1, a first nitrifying liquid; b2, a second nitrifying liquid; c1, a first precipitate; cc2, a second precipitate; 100. a denitrification method for cultivation sewage.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Briefly, sewage treatment can be understood as: in order to make the sewage meet the water quality requirement of being discharged into a certain water body or reused, the sewage is purified. The biological sewage treatment method utilizes microorganisms to adsorb, decompose and oxidize organic matters in sewage, so that the sewage is purified, and the method is the most commonly used sewage treatment method at present. The activated sludge process is a sewage treatment method for removing organic matter pollution in wastewater by utilizing the actions of coagulation, adsorption, oxidation, decomposition, precipitation and the like of activated sludge in the wastewater, has the advantages of good effect, high efficiency, low cost and the like, and is widely applied to the fields of cultivation wastewater, domestic wastewater, industrial wastewater and the like.
In the sewage treatment, COD (Chemica lOxygen Demand ) refers to the amount of oxygen consumed when substances capable of being oxidized in a water body are subjected to chemical oxidation, and is generally expressed in milligrams per liter of water, and is a basic comprehensive index for water quality monitoring, wherein the greater the COD, the more serious the pollution of the water body by organic matters. TN (total nitrogen) refers to the total amount of inorganic nitrogen (including NO3-, NO2-, NH4+ and the like) and organic nitrogen (including proteins, amino acids, organic amines and the like) in various forms in a water body, and is often used to represent the degree of pollution of the water body by nutrients. TP (total phosphorus) refers to the total amount of phosphorus in a water body in an inorganic state and an organic state, and is one of indexes for measuring the pollution degree of water. SS (Suspended Solids) refers to solid materials Suspended in water, including inorganic materials, organic materials, sediment, clay, microorganisms, etc., which are insoluble in water, and are one of the indicators for measuring the pollution level of water.
Specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.
According to one embodiment of the present application, there is provided a aquaculture wastewater denitrification system. FIG. 1 shows a aquaculture wastewater denitrification system according to an embodiment of the present application.
As shown in fig. 1, the cultivation sewage denitrification system comprises a solid-liquid separation device, an anaerobic fermentation device, a primary anaerobic-aerobic treatment device, a secondary anaerobic-aerobic treatment device and a discharge treatment device which are connected in sequence, and a sedimentation treatment device connected with the solid-liquid separation device, the anaerobic fermentation device, the primary anaerobic-aerobic treatment device, the secondary anaerobic-aerobic treatment device and/or the discharge treatment device.
In this embodiment, the solid-liquid separation device is used for solid-liquid separation of the cultivation wastewater discharged from a livestock farm (e.g., pig farm) or the like, to separate solid matter in the cultivation wastewater from the cultivation wastewater, and to obtain first-stage wastewater. The solid-liquid separation device can remove solid matters such as livestock manure and feed in the breeding sewage, can prevent equipment from being blocked or damaged due to larger solid matters, can reduce the content of organic matters in the water body, and effectively lightens the treatment load of subsequent devices in the system.
The anaerobic fermentation device is connected with the solid-liquid separation device and is used for carrying out anaerobic fermentation on the first-stage sewage so as to reduce the organic matter content in the water body and obtain the second-stage sewage. The anaerobic fermentation device can decompose organic matters in the sewage in the first stage and generate methane, so that the organic matter content in the water body is further reduced. In addition, the generated biogas can also be used for farms or auxiliary factories (such as harmless boilers, heating furnaces or feed factories) on the upstream and downstream sides of the farms, thereby being beneficial to reducing the running cost of the farms.
The first-stage anaerobic and aerobic treatment device is connected with the anaerobic fermentation device and is used for carrying out first mixing on the second-stage sewage and the first split sewage of the first-stage sewage to obtain a first mixed solution, and carrying out first-stage anaerobic and aerobic treatment on the first mixed solution so as to further reduce the organic matter content in the water body and obtain first-stage denitrification effluent. Similarly, the second-stage anaerobic and aerobic treatment device is connected with the first-stage anaerobic and aerobic treatment device and is used for carrying out second mixing on the first-stage denitrification effluent and the second split sewage of the first-stage sewage to obtain a second mixed solution, and carrying out second-stage anaerobic and aerobic treatment on the second mixed solution so as to further reduce the organic matter content in the water body and obtain second-stage denitrification effluent.
It should be noted here that in sewage treatment, anaerobic aerobic treatment, also referred to as AO treatment, means adding a anaerobic or anoxic biological treatment process before aerobic biological treatment of sewage. Illustratively, in the aerobic treatment stage, nitrifying bacteria and the like utilize ammonia nitrogen in the aquaculture sewage to perform a nitrifying reaction, converting the ammonia nitrogen into nitrite nitrogen and nitrate nitrogen or absorbing phosphorus. And then, returning nitrite nitrogen and nitrate nitrogen in the cultivation sewage to an anoxic treatment stage, and performing denitrification reaction by denitrifying bacteria and the like by utilizing the nitrite nitrogen and the nitrate nitrogen in the cultivation sewage and adding a carbon source (organic carbon), so that the compound ammonia is converted into molecular ammonia, and the effect of simultaneously removing COD and ammonia nitrogen content is achieved. The AO treatment can simultaneously remove the contents of organic matters such as ammonia nitrogen, phosphorus and the like in the sewage, and has the advantages of high degradation efficiency, simple flow, low cost and the like, so that the AO treatment method is particularly suitable for the treatment of the cultivation sewage.
In the embodiment, the first-stage anaerobic and aerobic treatment and the second-stage anaerobic and aerobic treatment are adopted, so that the denitrification efficiency of the culture sewage can be effectively improved, and the treatment cost of the culture sewage can be greatly reduced by taking the first split sewage and the second split sewage of the first-stage sewage as the added carbon source.
Further, the discharge treatment device is connected with the secondary anaerobic-aerobic treatment device and is used for carrying out third precipitation treatment on the secondary denitrification effluent to obtain third-stage effluent. The sedimentation treatment device is connected with the solid-liquid separation device, the anaerobic fermentation device, the primary anaerobic-aerobic treatment device, the secondary anaerobic-aerobic treatment device and/or the discharge treatment device and is used for storing sediment generated by the solid-liquid separation device, the anaerobic fermentation device, the primary anaerobic-aerobic treatment device, the secondary anaerobic-aerobic treatment device and/or the discharge treatment device.
Fig. 2 shows a primary anaerobic-aerobic treatment device and a secondary anaerobic-aerobic treatment device according to an embodiment of the present application.
As shown in FIG. 2, the primary anaerobic-aerobic treatment device comprises a primary denitrification tank, a primary nitrification tank and a primary sedimentation tank which are sequentially connected, and the primary denitrification tank is connected with the primary sedimentation tank. The first-stage denitrification tank is used for receiving the second-stage sewage from the anaerobic fermentation device, the first split-flow sewage from the first-stage sewage from the solid-liquid separation device and the first nitrifying liquid from the first-stage nitrification tank, performing first mixing to obtain a first mixed liquid, and performing denitrification treatment on the first mixed liquid to obtain a first denitrifying liquid. The first-stage nitrification tank is used for receiving the first denitrification liquid from the first-stage denitrification tank and performing nitrification treatment on the first denitrification liquid to obtain first nitrification liquid. The first sedimentation tank is used for carrying out first sedimentation treatment on the first nitrifying liquid, and further removing the organic matter content in the water to obtain first-stage denitrification effluent and first sediment.
Illustratively, the second stage sewage from the primary sedimentation tank first enters a primary denitrification tank, and is subjected to first mixing with the first split sewage and the first nitrifying liquid to obtain a first mixed liquid, wherein the carbon nitrogen ratio of the first mixed liquid is greater than or equal to 7, and the first mixed liquid is subjected to denitrification reaction under the action of denitrifying bacteria to obtain a first denitrifying liquid. Then, the first denitrifying liquid enters a first-stage nitrifying pond, nitrifying reaction is carried out under the action of nitrifying bacteria, one part of the obtained first nitrifying liquid enters a first-stage sedimentation pond, the other part of the obtained first nitrifying liquid flows back into the first denitrifying pond according to a first internal reflux ratio, and the first internal reflux ratio is more than or equal to 8. Then, adding a flocculating agent into the primary sedimentation tank to carry out first sedimentation treatment on the first nitrifying liquid. Finally, the first-stage denitrification effluent obtained in the first-stage sedimentation tank enters a subsequent second-stage anaerobic and aerobic treatment device through overflow, one part of the obtained first sediment flows back to the first-stage denitrification tank according to a first external reflux ratio, the first external reflux ratio is greater than or equal to 1, and the other part of the first sediment enters the sedimentation treatment device through a sludge pump or a sludge discharge pipe and the like. The first internal reflux ratio is the ratio of the reflux first nitrifying liquid flow rate to the first mixed liquid flow rate, and the first external reflux ratio is the ratio of the reflux first sediment flow rate to the first mixed liquid flow rate.
Similarly, the secondary anaerobic-aerobic treatment device comprises a secondary denitrification tank, a secondary nitrification tank and a secondary sedimentation tank which are connected in sequence, and the secondary denitrification tank is connected with the primary sedimentation tank. The second-stage denitrification tank is used for receiving the first-stage denitrification effluent from the first-stage anaerobic and aerobic treatment device, the second split sewage from the first-stage sewage of the solid-liquid separation device and the second nitrifying liquid from the second-stage nitrification tank, performing second mixing to obtain a second mixed liquid, and performing denitrification treatment on the second mixed liquid to obtain a second denitrifying liquid. The second-stage nitrification tank is used for receiving second denitrification liquid from the second-stage denitrification tank and performing nitrification treatment on the second denitrification liquid to obtain second nitrification liquid. The second sedimentation tank is used for carrying out second sedimentation treatment on the second nitrifying liquid, and further removing the organic matter content in the water to obtain second-stage denitrification effluent and second sediment.
Illustratively, the first-stage denitrification effluent from the first-stage sedimentation tank firstly enters a second-stage denitrification tank, and is subjected to second mixing with the second split sewage and the second nitrifying liquid to obtain a second mixed liquid, wherein the carbon nitrogen ratio of the second mixed liquid is greater than or equal to 5, and the second mixed liquid is subjected to denitrification reaction under the action of denitrifying bacteria to obtain a second denitrifying liquid. And then, the second denitrifying liquid enters a secondary nitrifying pond, nitrifying reaction is carried out under the action of nitrifying bacteria, one part of the obtained second nitrifying liquid enters a secondary sedimentation pond, the other part of the obtained second nitrifying liquid flows back into the second denitrifying pond according to a second internal reflux ratio, and the second internal reflux ratio is more than or equal to 8. And then adding a flocculating agent into the secondary sedimentation tank to carry out second sedimentation treatment on the second nitrifying liquid. Finally, the second-stage denitrification effluent obtained in the second-stage sedimentation tank enters a subsequent discharge treatment device through overflow, one part of the obtained second sediment flows back to the second-stage denitrification tank according to a second external reflux ratio, the second external reflux ratio is greater than or equal to 1, and the other part of the second sediment enters the sedimentation treatment device through a sludge discharge pump or a sludge discharge pipe and the like. The second internal reflux ratio is the ratio of the flow rate of the refluxed second nitrifying liquid to the flow rate of the second mixed liquid, and the second external reflux ratio is the ratio of the flow rate of the refluxed second sediment to the flow rate of the second mixed liquid.
FIG. 3 illustrates a aquaculture wastewater denitrification system according to another embodiment of the present application.
With respect to the above-mentioned solid-liquid separation apparatus, as one example, the solid-liquid separation apparatus includes a filtration tank, a solid-liquid separation unit, and a buffer tank, which are connected in this order. Optionally, the solid-liquid separation device may further include a collecting tank provided between the filtering tank and the solid-liquid separation unit. Wherein, the filter tank is used for receiving the cultivation sewage and utilizing a grid or a silk screen and the like to intercept the massive solid floaters in the cultivation sewage. The collecting tank is used for further removing part of solid particles in the culture sewage. The solid-liquid separation unit is used for separating solid from liquid in the culture sewage, and can be specifically selected as a rotary screen or an inclined screen plate. The buffer pool is used for adjusting the water quantity and the uniform water quality so that the cultivation sewage denitrification system continuously and stably operates. Illustratively, the aquaculture wastewater discharged from livestock farms and the like first enters a filter tank to remove large solid floats, then self-flows into a collection tank, and removes solid particulates in the water body by gravity settling. The culture sewage in the collecting tank is transmitted to the solid-liquid separation unit through the water pump and the like for solid-liquid separation, solid sediment separated by the solid-liquid separation unit is subjected to manure fermentation treatment, and separated liquid automatically flows into the buffer tank. Finally, the first stage sewage obtained in the buffer pool is pumped to the anaerobic fermentation device through a water pump. In a preferred embodiment, the first stage wastewater has a COD removal of up to about 24% and an ammonia nitrogen removal of up to about 7% as compared to untreated aquaculture wastewater.
With respect to the anaerobic fermentation apparatus mentioned above, as an example, the anaerobic fermentation apparatus includes an anaerobic fermentation unit connected to a buffer tank and a primary sedimentation tank connected to the anaerobic fermentation unit. The anaerobic fermentation unit is used for carrying out anaerobic fermentation on the first-stage sewage, and can be selected from an IC anaerobic reactor (interna lcirculation, internal circulation anaerobic reactor) or a UASB reactor (Up-flow Anaerobic Sludge Bed/blancet, upflow anaerobic sludge Blanket reactor) and the like. The primary sedimentation tank is used for further removing solid particles in the sewage of the first stage. The sewage from the first stage of the buffer tank firstly enters the anaerobic fermentation unit after passing through the primary sedimentation tank, most of organic matters are removed after anaerobic fermentation reaction, biogas and biogas slurry are produced simultaneously, the biogas can be used as fuel after being collected, purified and the like, and the biogas slurry overflows into the primary sedimentation tank. Next, a flocculating agent such as PAC (Poly aluminium Chloride ) or PAM (Poly acrylic amide, polyacrylamide) is added into the primary sedimentation tank, and the flocculating agent can adsorb suspended matters or colloidal particles in the biogas slurry and integrate to form large particles, and then sedimentation is performed by gravity to form a precipitate, so that solid particles in the water body are further removed. Finally, the sewage in the second stage obtained in the primary sedimentation tank enters a subsequent first-stage anaerobic and aerobic treatment device through overflow, and sediment enters a sediment treatment device through a mud pump or a mud pipe and the like. In a preferred embodiment, the removal rate of COD content in the second stage wastewater can be up to about 32% and the removal rate of SS content in the water can be up to about 73% as compared with untreated aquaculture wastewater.
The above-mentioned primary anaerobic-aerobic treatment device and secondary anaerobic-aerobic treatment device have been described in detail in connection with fig. 1 or 2, and will not be described again here. In a preferred embodiment, the removal rate of COD content in the water body can reach about 70% and the removal rate of TN content can reach about 60% compared with untreated aquaculture wastewater. In a preferred embodiment, the removal rate of COD content in the water body of the secondary denitrification effluent water is up to about 85% and the removal rate of TN content is up to about 90% compared with untreated aquaculture wastewater.
It will be appreciated by those skilled in the art that the reaction rate of the primary anaerobic-aerobic treatment and/or the secondary anaerobic-aerobic treatment is mainly related to the nitrification rate of nitrifying bacteria and the denitrification rate of denitrifying bacteria, and is susceptible to various factors, such as: C/N ratio, reflux ratio, ph value, mixed liquor activated sludge concentration (mixed liquor suspended solids, MLSS), sludge sedimentation ratio (sludge settling velocity, SV), sludge age, dissolved Oxygen (DO), and the like. Wherein the C/N ratio, namely the carbon nitrogen ratio, refers to the ratio of COD (chemical oxygen demand) to TN (total nitrogen) in water, and can reflect the biodegradability of sewage. The concentration of the activated sludge in the mixed liquor is an index of the quantity of the activated sludge in the mixed liquor after the sewage and the activated sludge are mixed, and can be used for representing the growth balance condition of microorganisms. The sludge sedimentation ratio refers to the proportion of the sediment sludge solvent formed after the mixed solution stands for 30 minutes in a measuring cylinder in the sewage aerobic treatment, and is one of important indexes for evaluating the activated sludge. Sludge age refers to the average residence time of activated sludge in a pond and is one of the indicators for evaluating the microbial status of activated sludge. The dissolved oxygen refers to the content of oxygen dissolved in water in sewage, and is one of the most important parameters in the sewage treatment process.
Regarding control of the carbon-nitrogen ratio (C/N ratio), it is verified through a lot of experiments by the applicant that when the carbon-nitrogen ratio of the first mixed solution is 7 or more and the carbon-nitrogen ratio of the second mixed solution is 5 or more, sufficient carbon sources can be allowed to react for denitrifying bacteria in the primary denitrification tank and the secondary denitrification tank, thereby improving the rate of denitrification reaction and further improving the overall denitrification efficiency.
Regarding the control of the reflux ratio, through a great number of experiments of the applicant, when the first internal reflux ratio is greater than or equal to 8 and the first external reflux ratio is greater than or equal to 1, nitrate nitrogen and/or nitrite nitrogen generated in the primary nitrification tank can be sufficiently refluxed to the primary denitrification tank to perform denitrification reaction, and meanwhile, the acidification of the first denitrification liquid is prevented, thereby being beneficial to improving the overall denitrification efficiency. Similarly, through a large number of experiments of the applicant, when the second internal reflux ratio is greater than or equal to 8 and the second external reflux ratio is greater than or equal to 1, nitrate nitrogen and/or nitrite nitrogen generated in the secondary nitrification tank can be sufficiently refluxed to the secondary denitrification tank to perform denitrification reaction, and meanwhile, acidification of the second denitrification liquid is prevented, so that the overall denitrification efficiency is improved.
Regarding the control of ph, it is preferable that the ph of the first mixed solution in this embodiment is in the range of 7.45 to 7.54; the pH value of the first nitrifying liquid ranges from 7.25 to 7.34, so that the growth of denitrifying bacteria is facilitated, and the rate of denitrification reaction is improved; the ph value of the second mixed solution ranges from 7.25 to 7.34; and the pH value of the second nitrifying liquid ranges from 7.05 to 7.14, so that the growth of nitrifying bacteria is facilitated, and the rate of the nitrifying reaction is improved.
Regarding the control of the sludge concentration (MLSS), it is preferable that the sludge concentration in this embodiment is generally controlled to 4000-4500mg/L, the activity of the sludge in winter is reduced, and the sludge concentration is controlled to about 5000 mg/L.
Regarding the control of the sludge sedimentation ratio (SV 30), it is preferable that the sludge sedimentation ratio in this embodiment is generally controlled to about 30% -40%, the activity of sludge in winter is reduced, and the sludge sedimentation ratio is controlled to about 50%.
Regarding the control of sludge age, it is preferable that the sludge age in this example is generally controlled to about 20 days, the activity of the sludge is reduced in winter, and the sludge age is controlled to about 25 days.
Regarding the control of Dissolved Oxygen (DO), preferably, the dissolved oxygen of the first mixed solution in this embodiment is generally controlled to be 0.1-0.5mg/L, which is advantageous for the growth of denitrifying bacteria and increases the rate of denitrification; the dissolved oxygen of the second mixed solution is generally controlled to be 1-2mg/L, thus being beneficial to the growth of nitrifying bacteria and improving the rate of nitrifying reaction.
With respect to the above-mentioned discharge treatment device, as one example, the discharge treatment device includes a final sedimentation tank and a discharge tank connected in sequence, and the final sedimentation tank is connected with the secondary sedimentation tank. The final sedimentation tank is used for receiving the second-stage denitrification effluent from the second-stage anaerobic and aerobic treatment device and carrying out sedimentation treatment on the second-stage denitrification effluent to obtain third-stage effluent, and the discharge tank is used for storing and discharging the third-stage effluent. Illustratively, the secondary denitrification effluent from the secondary sedimentation tank first enters a final sedimentation tank, and a flocculant is added to the final sedimentation tank to further remove solid particulates in the water body, and obtain a third stage effluent and a precipitate. And the effluent from the third stage overflows into a discharge tank, and the sediment is conveyed to a sediment treatment device through a mud pump or a mud pipe and the like. Finally, third-stage effluent meeting the discharge standard is obtained in the discharge pool, and is conveyed to a sewage treatment plant for centralized treatment by a water pump and the like. It should be noted that, the quality of the effluent water of the third stage should meet the pollutant emission limit value in the pollutant emission standard of livestock and poultry farming (GB 18596-2001), and the effluent water can be used for breeding three water bodies of hurdles, aquaculture or surface water, which are well known to those skilled in the art and will not be described herein.
With respect to the above-mentioned sedimentation treatment device, as an example, the sedimentation treatment device includes a sedimentation reservoir for storing sediment and a sedimentation treatment unit connected to the sedimentation reservoir. Illustratively, the sedimentation reservoir is connected to the buffer reservoir, anaerobic fermentation unit, primary sedimentation reservoir, primary denitrification reservoir, primary sedimentation reservoir, secondary denitrification reservoir, secondary sedimentation reservoir and/or final sedimentation reservoir mentioned above. Preferably, the sedimentation treatment unit can be a spiral shell stacking machine, and the spiral shell stacking machine can be used for carrying out dehydration treatment on sediments and has the advantages of difficult blockage, simple operation, wide application and the like. The treated precipitate contains a large amount of organic matters, can be used for producing organic fertilizer after being treated (aerobic fermentation or composting and the like), and has good environmental protection benefit and economic benefit.
FIG. 4 illustrates an exemplary flow chart of a method of denitrification of aquaculture wastewater according to an embodiment of the present application. It will be appreciated that the method 100 illustrated in FIG. 4 may be implemented in the aquaculture wastewater denitrification system described hereinabove, and thus the description hereinabove regarding the aquaculture wastewater denitrification system applies equally to the method 100 illustrated in FIG. 4.
As shown in FIG. 4, the cultivation wastewater denitrification method comprises the following steps:
s101: and (3) carrying out solid-liquid separation treatment on the culture sewage discharged by the farm to obtain separated first-stage sewage.
S102: anaerobic fermentation treatment is carried out on the sewage in the first stage, and the sewage in the second stage is obtained.
S103: and carrying out first mixing on the second-stage sewage and the first split sewage of the first-stage sewage to obtain a first mixed solution, and carrying out first-stage anaerobic and aerobic treatment on the first mixed solution to obtain first-stage denitrification effluent.
S104: and carrying out second mixing on the first-stage denitrification effluent and second split sewage of the first-stage sewage to obtain a second mixed solution, and carrying out second-stage anaerobic and aerobic treatment on the second mixed solution to obtain second-stage denitrification effluent.
Further, as shown in fig. 4, the method for denitrification of the cultivation sewage according to the embodiment of the application further includes:
s105: and carrying out third precipitation treatment on the second-stage denitrification effluent to obtain third-stage effluent.
S106: and storing the sediment generated by the solid-liquid separation treatment, anaerobic fermentation treatment, primary anaerobic-aerobic treatment and/or secondary anaerobic-aerobic treatment.
In particular embodiments, steps S1-S6 of the process may be performed by any means that may be practiced, such as the solid-liquid separation means, anaerobic fermentation means, primary anaerobic-aerobic treatment means, secondary anaerobic-aerobic treatment means, discharge treatment means, and/or precipitation treatment means described above. The method 100 shown in fig. 4 has been described in detail in connection with the system described in any of fig. 1-3, and will not be described in detail here.
Thus, by the method and the system for denitrification of the aquaculture sewage provided above, those skilled in the art can understand that the primary anaerobic-aerobic treatment and the secondary anaerobic-aerobic treatment are adopted for the aquaculture sewage, and part of the aquaculture sewage is used as an added carbon source, so that the additional purchase of the added carbon source is not required, thereby effectively improving the denitrification efficiency of the aquaculture sewage and greatly reducing the cost of sewage treatment.
It should be understood that the terms "comprises" and "comprising," when used in this specification and in the claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the present application is for the purpose of describing particular embodiments only, and is not intended to be limiting of the application. As used in the specification and claims of this application, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in the present specification and claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
While various embodiments of the present application have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous modifications, changes, and substitutions will occur to those skilled in the art without departing from the spirit and scope of the present application. It should be understood that various alternatives to the embodiments of the present application described herein may be employed in practicing the application. The appended claims are intended to define the scope of the application and are therefore to cover all equivalents and alternatives falling within the scope of these claims.
Claims (10)
1. A method for denitrifying aquaculture wastewater, said method comprising:
carrying out solid-liquid separation treatment on the culture sewage discharged by the farm to obtain first-stage sewage;
anaerobic fermentation treatment is carried out on the first-stage sewage to obtain second-stage sewage;
first mixing the second-stage sewage and the first split sewage of the first-stage sewage to obtain a first mixed solution, and performing primary anaerobic-aerobic treatment on the first mixed solution to obtain primary denitrification effluent; and
and carrying out second mixing on the first-stage denitrification effluent and the second split sewage of the first-stage sewage to obtain a second mixed solution, and carrying out second-stage anaerobic and aerobic treatment on the second mixed solution to obtain second-stage denitrification effluent.
2. A method for denitrification of aquaculture wastewater according to claim 1,
the primary anaerobic-aerobic treatment comprises the following steps:
performing first denitrification treatment on the first mixed solution to obtain a first denitrification solution;
performing first nitrification treatment on the first denitrification liquid to obtain a first nitrified liquid; and
performing first precipitation treatment on the first nitrifying liquid to obtain first-stage denitrification effluent and first precipitate, wherein the carbon-nitrogen ratio of the first mixed liquid is greater than or equal to 7;
the secondary anaerobic-aerobic treatment comprises:
performing a second denitrification treatment on the second mixed solution to obtain a second denitrification solution;
performing a second nitrification treatment on the second denitrification liquid to obtain a second nitrified liquid; and
and carrying out second precipitation treatment on the second nitrifying liquid to obtain second-stage denitrification effluent and second precipitate, wherein the carbon-nitrogen ratio of the second mixed liquid is greater than or equal to 5.
3. A method for denitrification of aquaculture wastewater according to claim 2,
the primary anaerobic-aerobic treatment further comprises:
the first nitrifying liquid is refluxed into the first mixed liquid according to a first internal reflux ratio which is greater than or equal to 8, wherein the first internal reflux ratio is the ratio of the reflux first nitrifying liquid flow rate to the first mixed liquid flow rate; and
refluxing the first precipitate into the first mixed liquid according to a first external reflux ratio, wherein the first external reflux ratio is greater than or equal to 1, and is the ratio of the refluxed first precipitate flow to the first mixed liquid flow;
the secondary anaerobic-aerobic treatment further comprises:
refluxing the second nitrifying liquid into the second mixed liquid according to a second internal reflux ratio, wherein the second internal reflux ratio is greater than or equal to 8, and the second internal reflux ratio is the ratio of the flow rate of the refluxed second nitrifying liquid to the flow rate of the second mixed liquid; and
and refluxing the second precipitate into the second mixed liquid according to a second external reflux ratio, wherein the second external reflux ratio is greater than or equal to 1, and the second external reflux ratio is the ratio of the flow rate of the refluxed second precipitate to the flow rate of the second mixed liquid.
4. A method for denitrification of aquaculture wastewater according to claim 3,
the pH value of the first mixed solution ranges from 7.45 to 7.54;
the pH value of the first nitrifying liquid ranges from 7.25 to 7.34;
the ph value of the second mixed solution ranges from 7.25 to 7.34; and
the pH value of the second nitrifying liquid ranges from 7.05 to 7.14.
5. The method of denitrification of aquaculture wastewater according to claim 1, further comprising:
performing third precipitation treatment on the second-stage denitrification effluent to obtain third-stage effluent; and
and storing the sediment generated by the solid-liquid separation treatment, anaerobic fermentation treatment, primary anaerobic-aerobic treatment and/or secondary anaerobic-aerobic treatment.
6. A aquaculture wastewater denitrification system, the aquaculture wastewater denitrification system comprising:
the solid-liquid separation device is used for carrying out solid-liquid separation on the culture sewage discharged by the farm to obtain first-stage sewage;
the anaerobic fermentation device is used for carrying out anaerobic fermentation on the first-stage sewage to obtain second-stage sewage, and the anaerobic fermentation device is connected with the solid-liquid separation device;
the first-stage anaerobic and aerobic treatment device is connected with the solid-liquid separation device and is used for carrying out first mixing on the second-stage sewage and the first split sewage of the first-stage sewage to obtain a first mixed solution, and carrying out first-stage anaerobic and aerobic treatment on the first mixed solution to obtain first-stage denitrification effluent;
the second-stage anaerobic-aerobic treatment device is connected with the first-stage anaerobic-aerobic treatment device and is used for carrying out second mixing on the first-stage denitrification effluent and the second split sewage of the first-stage sewage to obtain a second mixed solution, and carrying out second-stage anaerobic-aerobic treatment on the second mixed solution to obtain second-stage denitrification effluent;
the discharge treatment device is connected with the secondary anaerobic-aerobic treatment device and is used for carrying out third precipitation treatment on the secondary denitrification effluent to obtain third-stage effluent; and
the sedimentation treatment device is connected with the solid-liquid separation device, the anaerobic fermentation device, the primary anaerobic-aerobic treatment device, the secondary anaerobic-aerobic treatment device and/or the discharge treatment device and is used for storing sediment generated by the solid-liquid separation device, the anaerobic fermentation device, the primary anaerobic-aerobic treatment device, the secondary anaerobic-aerobic treatment device and/or the discharge treatment device.
7. The system for denitrification of aquaculture wastewater according to claim 6,
the primary anaerobic-aerobic treatment device comprises:
the first-stage denitrification tank is used for carrying out denitrification treatment on the first mixed liquid to obtain first denitrification liquid;
the first-stage nitrification tank is connected with the first-stage denitrification tank and is used for nitrifying the first denitrification liquid to obtain a first nitrified liquid; and
the first-stage sedimentation tank is connected with the first-stage nitrification tank and is used for carrying out sedimentation treatment on the first nitrifying liquid to obtain the first-stage denitrification effluent and a first precipitate;
the secondary anaerobic-aerobic treatment device comprises:
the second-stage denitrification tank is connected with the first-stage sedimentation tank and is used for carrying out denitrification treatment on the second mixed liquid to obtain a second denitrification liquid;
the secondary nitrification tank is used for nitrifying the second denitrification liquid to obtain a second nitrification liquid, and the secondary nitrification tank is connected with the secondary denitrification tank; and
and the secondary sedimentation tank is connected with the secondary nitrification tank and is used for carrying out sedimentation treatment on the second nitrifying liquid to obtain the secondary denitrification effluent and a second sediment.
8. The system for denitrification of aquaculture wastewater according to claim 6,
the solid-liquid separation device includes:
a filter tank for removing floaters in the culture sewage;
the solid-liquid separation unit is connected with the filter tank and is used for carrying out solid-liquid separation treatment on the culture sewage; and
the buffer tank is connected with the solid-liquid separation unit and is used for temporarily storing the first-stage sewage to meet the intermittent water storage requirement of starting and stopping the water outlet pump;
the anaerobic treatment device comprises:
the anaerobic fermentation unit is connected with the buffer tank and is used for carrying out anaerobic fermentation on the first-stage sewage; and
the primary sedimentation tank is connected with the anaerobic fermentation unit and the primary denitrification tank and is used for storing the second-stage sewage;
the emission treatment device includes:
the final sedimentation tank is connected with the secondary sedimentation tank and is used for carrying out third sedimentation treatment on the secondary denitrification effluent to obtain the third-stage effluent; and
and the discharge pool is connected with the final sedimentation pool and is used for temporarily storing the effluent of the third stage.
9. The aquaculture wastewater denitrification system according to claim 8, wherein the sedimentation treatment device comprises a sedimentation storage tank connected to the sludge tank, buffer tank, anaerobic fermentation unit, primary sedimentation tank, primary denitrification tank, primary sedimentation tank, secondary denitrification tank, secondary sedimentation tank and/or final sedimentation tank for storing the sediment.
10. The aquaculture wastewater denitrification system of claim 8 wherein the sediment treatment assembly further comprises a sediment treatment unit coupled to the sediment reservoir.
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