CN211141836U - Waste paper regeneration papermaking wastewater treatment device - Google Patents
Waste paper regeneration papermaking wastewater treatment device Download PDFInfo
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- CN211141836U CN211141836U CN201922091863.5U CN201922091863U CN211141836U CN 211141836 U CN211141836 U CN 211141836U CN 201922091863 U CN201922091863 U CN 201922091863U CN 211141836 U CN211141836 U CN 211141836U
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Abstract
The utility model discloses a waste paper regeneration papermaking effluent treatment plant belongs to waste water treatment technical field. Papermaking effluent treatment plant is regenerated to waste paper, include the grid well, inclined wire that connect gradually with waste water pipeline and receive thick liquid pond, just sink pond, shallow air supporting pond, aerobe and secondary sedimentation tank, inclined wire receive thick liquid pond with set up the equalizing basin between the just sink pond, set up middle pond between shallow air supporting pond and the aerobe and handle the pond, charge device is connected respectively to shallow air supporting pond and secondary sedimentation tank, just sink pond, shallow air supporting pond and secondary sedimentation tank respectively with dirty sedimentation tankThe mud concentration tanks are connected. The utility model discloses can be to the COD in the waste paper regeneration papermaking treatment waste watercr、BOD5And SS is effectively removed, and the comprehensive treatment effect of the wastewater is improved.
Description
Technical Field
The utility model belongs to the technical field of waste water treatment, especially, relate to a waste paper regeneration papermaking effluent treatment plant.
Background
The production raw material of the waste paper regeneration papermaking process is waste cardboard paper, and the waste cardboard paper is adopted for pulping to produce the original color cardboard paper. The production process includes the steps of hydraulic pulping of waste paper, screening, concentrating, grinding and other steps to obtain pulp, and mixing the pulp to obtain paper product. The discharge of waste water pollutants is mainly waste water generated in production processes of washing, pulp screening, concentration and the like, the papermaking white water is completely used for diluting pulp to carry out pulping, pulp grinding and concentration processes, and the washing waste water is discharged after being treated in a sewage treatment station.
The patent document with publication number CN 201971706U discloses a papermaking wastewater treatment system, which consists of a slurry collecting tank, a sedimentation tank, a primary sedimentation tank, an adjusting tank, a water collecting tank, a secondary sedimentation tank, a sand filter and a reuse water tank which are connected in sequence, wherein an anaerobic tank and an aerobic tank are sequentially connected between the water collecting tank and the secondary sedimentation tank, the utility model can decompose organic matters in wastewater, and realize effective treatment and utilization of wastewater and sludge. But the treatment system is directed to CODcr、BOD5And the comprehensive treatment effect of SS is poor, and various indexes are difficult to meet the requirements of relevant emission standards and need to be improved.
SUMMERY OF THE UTILITY MODEL
In view of this, the technical problem to be solved of the present invention is to provide a waste paper recycling and papermaking wastewater treatment device to reduce COD in the wastewatercr、BOD5And SS concentration to meet the relevant emission standard requirements.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
waste paper regeneration papermaking effluent treatment plant includes grid well, inclined wire collecting tank, just heavy pond, shallow air supporting pond, aerobe processing pond and the secondary sedimentation tank that connects gradually with waste water pipeline, inclined wire collecting tank with set up the equalizing basin between the just heavy pond, set up middle pond between shallow air supporting pond and the aerobe processing pond, retrieval and utilization water pipeline is connected to middle pond, charge device is connected respectively to shallow air supporting pond and secondary sedimentation tank, just heavy pond, shallow air supporting pond and secondary sedimentation tank are connected with sludge thickening pond respectively.
Preferably, the grid well is provided with accident bypass channels.
Preferably, a submersible stirrer, an electromagnetic flow meter and a liquid level controller are arranged in the regulating tank.
Preferably, the regulating reservoir is connected with an emergency accident pool.
Preferably, the aerobic biological treatment tank is an SBR reaction tank or an MBR membrane biological reaction tank.
Preferably, the sludge concentration tank is connected with a sludge dewatering machine room, and supernatant of the sludge concentration tank and leachate of the sludge dewatering machine room respectively flow into the regulating tank through a return pipeline.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses effluent treatment plant is applicable to and handles waste paper regeneration papermaking waste water, especially adopts the technology of useless boxboard pulping production primary color boxboard, and the waste water that the discharge of this kind of waste water pollutant mainly produced for production processes such as washing, screening thick liquid, concentration, and SS content in this kind of waste water is higher, and silt content is great, and the biodegradability is lower, has consequently adopted pretreatment systems.
The waste water generated in the above process firstly passes through the grating to remove larger floaters and then enters the inclined wire pulp collecting tank, and after residual paper pulp in the waste water is recovered, the waste water enters the adjusting tank, the grating removal efficiency reaches 98 percent, and the adjusting tank enables the quality of the waste water to be uniformly mixed and prevents suspended matters from depositing; the wastewater in the regulating tank is lifted to a primary sedimentation tank through a lifting pump, large-particle impurities and suspended matters in the wastewater are precipitated and removed, and then the wastewater enters a shallow air flotation tank to remove oil and small suspended matters in the wastewater, so that the pressure of a subsequent biochemical system is reduced; then the wastewater enters an intermediate water tank, part of the recycled water flows out from a recycled water pipeline, the rest part flows into an aerobic biological treatment tank automatically, and the aerobic biological treatment tank preferably adopts SBR treatment process or MBR membrane treatment process to treat COD (chemical oxygen demand) in the wastewatercr、BOD5Effectively removing pollutants; then the wastewater enters a secondary sedimentation tank, a dosing device, namely a flocculating agent dosing system, is additionally arranged before the wastewater enters the secondary sedimentation tank, and dosing is carried out if necessary, so that the wastewater is ensured to be subjected to good mud-water separation, and the effluent of the secondary sedimentation tank reaches the standard and is discharged outside. Sludge discharged from each stage of sedimentation tank enters a sludge concentration tank, the sludge concentration tank is designed in a semi-underground manner, and partial sedimentation tanks can discharge sludge under self-pressure; the sludge concentrated by the sludge concentration tank is lifted and then enters a sludge dewatering machine for dewatering, and the dewatered sludge cake can be composted or transported outside.
The utility model discloses combine the characteristics of waste paper regeneration papermaking waste water, adopt the inclined wire to receive thick liquid + just sink + shallow air supporting + SBR's processing technology, handle the target pollutant of waste paper regeneration papermaking waste water and reach the relevant standard requirement in national "paper industry water pollutant discharge standard" (DB 41/389) supplementarian 2004) to the limit value, whole technological design is reasonable, and the treatment effeciency is high.
Drawings
FIG. 1 is a process flow diagram of a waste paper recycling and papermaking wastewater treatment device of the present invention;
wherein: 1-grid well, 2-inclined net slurry collecting tank, 3-regulating tank, 4-primary settling tank, 5-shallow air floating tank, 6-intermediate water tank, 7-aerobic biological treatment tank, 8-secondary settling tank, 9-sludge concentration tank, 10-emergency accident tank and 11-sludge dewatering machine room.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the waste paper regeneration papermaking wastewater treatment device comprises a grid well 1, an inclined net pulp collecting tank 2, a primary sedimentation tank 4, a shallow air flotation tank 5, an aerobic biological treatment tank 7 and a secondary sedimentation tank 8 which are sequentially connected with a wastewater pipeline, wherein an adjusting tank 3 is arranged between the inclined net pulp collecting tank 2 and the primary sedimentation tank 4, an intermediate water tank 6 is arranged between the shallow air flotation tank 5 and the aerobic biological treatment tank 7, the intermediate water tank is connected with a recycling water pipeline, the shallow air flotation tank 5 and the secondary sedimentation tank 8 are respectively connected with a chemical adding device, and the primary sedimentation tank 4, the shallow air flotation tank 5 and the secondary sedimentation tank 8 are respectively connected with a sludge concentration tank 9.
The grid well 1 is an installation platform of a mechanical grid, most of large floating and suspended impurities in sewage are removed through the mechanical grid, and the removal rate can reach more than 98 percent so as to reduce the failure rate of subsequent equipment operation. Preferably, the grating well 1 is provided with accident bypass channels.
The inclined wire pulp collecting tank 2 recycles the paper pulp in the waste water once, saves precious paper pulp resources, reduces certain operation cost and reduces the treatment pressure of a subsequent treatment system. Inclined net slurry collecting equipment is arranged in the inclined net slurry collecting tank 2, the inclined net slurry collecting equipment generally consists of an inclined net and a flat net and is conventional water treatment used equipment, engineering practices show that the number of the inclined net is generally 60-80 meshes, the number of the flat net is generally 100 meshes, the installation form adopts fixed installation, the installation angle is 45-65 degrees, the installation angle is not easy to be overlarge, the hydraulic load is reduced when the installation angle is overlarge, the treatment capacity is reduced, partial investment is increased, the screen is easy to be blocked when the installation angle is too small, the slag removal difficulty is increased, and the treatment effect is influenced.
The regulating tank 3 regulates the quality and quantity of wastewater discharged from a factory to ensure the stability of water inlet load and the normal operation of a system in a subsequent treatment stage. A submersible mixer, an electromagnetic flow meter and a liquid level controller are arranged in the regulating tank 3, wherein the submersible mixer is HTQJ1.5/6-260 in model, the electromagnetic flow meter is MGG-C-200 in model, and the liquid level controller is SF-102 in model.
Preferably, the adjusting pool 3 is connected with an emergency accident pool 10. In order to guarantee that waste water is not directly discharged outside during the overhaul of the facility and impact on a system caused by sudden change of water quality and water quantity, an emergency accident pool 10 is arranged, waste water can be temporarily stored in the accident pool during the overhaul of the system, the emergency accident pool 10 and a regulating pool 3 are jointly built or a gate channel is arranged between the two pools, when the regulating pool 3 is at a low water level, the waste water in the emergency accident pool 10 can automatically flow into the regulating pool 3, and the cost for lifting part of waste water is saved.
A primary sedimentation tank 4: inorganic sand and sludge in the wastewater are precipitated from the wastewater, and the mud-water mixed liquor is well separated, so that the purposes of removing suspended impurities and reducing the pressure of subsequent treatment facilities are achieved.
Shallow air flotation tank 5: a large amount of dense micro bubbles are introduced into the wastewater, so that the dense micro bubbles and impurities, micro suspended matters and flocculating particles in the wastewater are adhered to each other to form a floating body with integral specific gravity smaller than that of water, and the floating body rises to the water surface by means of buoyancy to complete solid-liquid separation and achieve the aim of effectively removing the suspended matters. A shallow air flotation machine and a matched system are arranged in the shallow air flotation tank 5, and the dosing device is specifically a flocculating agent dosing device.
The intermediate water pool 6: the recycled water part flows out from the pool, and the rest part automatically flows into the aerobic treatment system and can be used as a water diversion facility of a subsequent treatment facility.
Aerobic biological treatment tank 7: activated sludge is cultured in the tank, aeration is carried out on the bottom of the tank to oxygenate the sewage, and the sewage in the tank body is in an aerobic state, so that the sewage is fully contacted with the activated sludge, and the defect that the sewage and the sludge are not uniformly contacted in the aerobic biological treatment tank 7 is avoided. By means of blast aeration supply and control of the operation mode, a biological community with a long food chain formed by anaerobic bacteria, facultative bacteria, aerobic bacteria, primary and secondary animals can be formed in the sludge, and nitrogen and phosphorus in the wastewater can be well removed. Anaerobic degradation is carried out to biochemical organic matters, the purpose of removing pollutants in the wastewater is achieved, and aged activated sludge or residual activated sludge is discharged out of the pool.
And (4) secondary sedimentation tank 8: the settling time reaches 3.3 hours, so that the sludge-water mixed liquid in the sewage is further well separated, and a better settling effect is achieved. Wherein, set up tubular static mixer and scrape the suction dredge in the secondary sedimentation tank 8, scrape the suction dredge and be connected with the mud pipeline, secondary sedimentation tank 8 connects charge device, specifically coagulant adding equipment.
Sludge concentration tank 9: and collecting sludge in each sedimentation tank, concentrating, and then delivering to a sludge dewatering machine room 11 for dewatering.
As a specific embodiment of the utility model, the sludge thickening tank 9 is connected with the sludge dewatering machine room 11, and the supernatant of the sludge thickening tank 9 and the percolate of the sludge dewatering machine room 11 flow into the regulating tank 3 through the backflow pipeline respectively.
Wherein: sludge dewatering machine room 11: a belt type sludge dewatering machine is arranged in a complete set of installation place of the sludge dewatering machine.
The dosing device is arranged in the dosing room and mainly comprises a flocculating agent dosing device for the shallow air flotation tank 5 and a coagulating agent dosing device for the secondary sedimentation tank 8.
The treatment of such wastewater may be carried out by various treatment processes, but basically may be defined as "physical and chemical treatment + biochemical treatment". The physicochemical treatment mainly comprises the comparison of inclined screen slurry collection, coagulation primary sedimentation and shallow air flotation and the comparison of inclined screen slurry collection, primary sedimentation and shallow air flotation; because the ammonia nitrogen content of the wastewater is low, the biochemical treatment system is mainly the process comparison of an aerobic treatment system, and the comparative analysis and the preferred selection of the provided processes are carried out below.
1) Comparative process 1:
inclined net slurry collection, coagulation primary sedimentation, shallow air flotation and aerobic treatment
The process adopts a method of physicochemical treatment and biochemical treatment, is basically the same as the process adopted by people, and has the difference that the coagulation treatment is added in a primary sedimentation tank of a physicochemical system, the coagulation treatment is beneficial to the formation and generation of sediment, the effect of the sediment is greatly increased, particularly the removal rate of suspended matters is increased by 50 percent, and the pressure of a shallow air floatation treatment system can be effectively reduced. In the shallow air flotation treatment process, a coagulant is also needed, the operation cost, capital investment, maintenance cost and operation difficulty of the shallow air flotation treatment process are increased due to the use of the coagulant twice, and the biodegradability of treated effluent is influenced to a certain extent.
2) Comparative process 2:
inclined net slurry collection, primary sedimentation, shallow air flotation and oxidation ditch
The oxidation ditch has various forms such as a Pasteur oxidation ditch, a Carussel oxidation ditch, an Oebel oxidation ditch and the like, is mostly adopted in large and medium-sized sewage treatment systems, and is more common in urban sewage treatment systems. The total water amount in the first project of the plant was 7000m3About d, and the water quantity entering the aerobic treatment system is only 4000m3About d, water amount is relativelySmall, is not suitable for adopting the aerobic treatment process of the oxidation ditch.
3) Comparative process 3:
inclined net slurry collection, primary sedimentation, shallow air flotation and MBR
The process can ensure that effluent reaches the standard, the biochemical treatment process is advanced, the operation and maintenance are convenient, but the MBR investment is high, and the operation cost is high.
The MBR process is a membrane bioreactor treatment process, is a novel wastewater biological treatment technology organically combining a modern membrane separation technology and a biotechnology, and utilizes a membrane separation device to effectively intercept active sludge and macromolecular organic substances in a biochemical reaction tank to replace a secondary sedimentation tank so as to greatly improve the concentration (biomass) of the active sludge in the biochemical reaction tank; realizes the respective control of Hydraulic Retention Time (HRT) and Sludge Retention Time (SRT), and traps the macromolecular organic substances which are difficult to degrade in the reaction tank for continuous reaction and degradation.
The membrane bioreactor process greatly improves the treatment efficiency of the bioreactor through a membrane separation technology, has the advantages of high biochemical efficiency, strong load impact resistance, good and stable effluent water quality, small occupied area, long sludge discharge period, easy realization of automatic control and the like compared with the traditional biological treatment process, is one of the most promising wastewater biological treatment technologies in the fields of high-concentration organic wastewater treatment, reclaimed water recycling treatment and the like at present, has good treatment effect, and can directly reach the quality of reuse water.
The investment of MBR process is 160-190 ten thousand yuan higher than that of SBR process, the operation cost is high, only the operation cost of the section reaches more than 1.0 yuan/ton of water, and meanwhile, the operation management and operation maintenance are complex, and the labor intensity is high.
4) Comparative process 4:
inclined net slurry collection, primary sedimentation, shallow air flotation and SBR
The utility model discloses a processing technology of "oblique net receipts thick liquid + just sinks + shallow air supporting + SBR", this technology can guarantee that it is up to standard to go out water, and the technology is more reasonable, and degree of automation is higher, and operation maintenance is convenient. SBR is a simple, rapid and low-energy-consumption wastewater biological treatment process, and the operation mode of the process consists of a water inlet period, an aeration period, a precipitation period, a water discharge period and a no-load sludge discharge period. The SBR process adopts an intermittent operation mode, and sewage intermittently enters a treatment system and is intermittently discharged. Only one treatment unit is arranged in the system, the unit plays different roles at different times, sewage enters the unit and then is treated in sequence, and finally the total treatment is finished and discharged. Generally, one run cycle of SBR comprises five phases. Stage I is a water inlet period, and sewage continuously enters the treatment tank in the period until the highest operation liquid level is reached; and the stage II is an aeration stage, water is not fed or discharged in the stage, an aeration system is started for aeration to carry out biochemical decomposition on pollutants, the stage III is a precipitation stage, water is not fed or discharged in the stage, and aeration is not carried out, the reaction tank is in a static settling state to carry out high-efficiency sludge-water separation, the stage IV is a drainage stage, separated supernatant is continuously discharged in the stage V is an idle-load sludge discharge stage, no sewage exists in the tank, only activated sludge is precipitated and separated, and part of sludge is discharged as residual sludge in the stage.
And a diaphragm aerator and a decanter are arranged in the SBR reaction tank, wherein the diaphragm aerator is connected with a fan. The number of the aerobic biological treatment tanks is more than 2, the running period is 6.0h (1), and the reaction time is as follows: 4.0h (1 seat), hypoxia time: 1.3 h (1 seat), aerobic time: 2.7 h (1 seat), decanting time: 1.0 h (1 seat), water inlet and sludge discharge time: 1.0 h (1 seat), operation mode: the two tanks operate alternately.
The method is characterized in that: 1. the operation mode is flexible, and better nitrogen and phosphorus removal effects can be achieved by controlling the operation mode; 2. the secondary sedimentation tank can be saved, and part of capital construction investment is saved; 3. the automation is easy to realize, and the automation degree is higher; 4. because the device adopts a periodic operation mode, more than two pools are required to be operated in parallel during operation.
Synthesize above analysis, the utility model discloses the aerobic biological treatment pond is considering under each pollutant index up to standard's the condition, can select SBR reaction tank or MBR membrane biological reaction pond, combines the cost to consider again, prefers SBR reaction tank.
The device is used for treating wastePaper regeneration papermaking wastewater, treatment scale: 8000m3The recovery amount is 3500m3D, emission 4500 m3D (containing domestic wastewater 7 m)3/d)。
Designing the quality of inlet water:
CODcr：1300mg/L；
BOD5：400mg/L ；
SS：1100 mg/L；
PH：6.9；
chroma: 300 times.
After the treatment of the wastewater treatment device of the utility model, the drainage reaches the relevant requirements of the discharge standard of water pollutants for paper industry (DB 41/389-supplement 2004), and the specific indexes are as follows:
CODcr：≤100mg/L；
BOD5：≤40mg/L；
SS： ≤100mg/L；
pH value: 6-9;
chroma: less than or equal to 100 times;
the removal rates (E) of the main indexes are respectively:
CODcr：E≥92.3%；
BOD5：E≥90.0%；
SS：E≥90.9%；
chroma: e is more than or equal to 76 percent.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent replacements made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. Waste paper regeneration papermaking effluent treatment plant which characterized in that: include the grid well, inclined wire slurry collecting tank, just heavy pond, shallow air supporting pond, aerobic biological treatment pond and the secondary sedimentation tank that connect gradually with waste water pipeline, inclined wire slurry collecting tank with set up the equalizing basin between the just heavy pond, set up middle pond between shallow air supporting pond and the aerobic biological treatment pond, retrieval and utilization water pipeling is connected to middle pond, charge device is connected respectively to shallow air supporting pond and secondary sedimentation tank, just heavy pond, shallow air supporting pond and secondary sedimentation tank are connected with sludge concentration tank respectively.
2. The used paper recycling papermaking wastewater treatment apparatus according to claim 1, characterized in that: the grid well is provided with an accident bypass channel.
3. The waste paper recycling papermaking wastewater treatment apparatus according to claim 2, characterized in that: and a submersible stirrer, an electromagnetic flow meter and a liquid level controller are arranged in the regulating tank.
4. The waste paper recycling papermaking wastewater treatment apparatus according to claim 3, characterized in that: the adjusting pool is connected with the emergency accident pool.
5. The waste paper recycling papermaking wastewater treatment apparatus according to claim 3, characterized in that: the aerobic biological treatment tank is an SBR reaction tank or an MBR membrane biological reaction tank.
6. The used paper recycling papermaking wastewater treatment apparatus according to any one of claims 1 to 5, characterized in that: the sludge concentration tank is connected with the sludge dewatering machine room, and supernatant of the sludge concentration tank and percolate of the sludge dewatering machine room respectively flow into the regulating tank through return pipes.
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| CN201922091863.5U CN211141836U (en) | 2019-11-28 | 2019-11-28 | Waste paper regeneration papermaking wastewater treatment device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115893719A (en) * | 2022-11-14 | 2023-04-04 | 新疆水处理工程技术研究中心有限公司 | Treatment system and treatment method for papermaking wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115893719A (en) * | 2022-11-14 | 2023-04-04 | 新疆水处理工程技术研究中心有限公司 | Treatment system and treatment method for papermaking wastewater |
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