CN110655271A - Integrated technology for treating wheat straw wastewater - Google Patents
Integrated technology for treating wheat straw wastewater Download PDFInfo
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C02F1/00—Treatment of water, waste water, or sewage
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- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F1/72—Treatment of water, waste water, or sewage by oxidation
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- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone
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- C02F2001/007—Processes including a sedimentation step
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Abstract
The invention discloses an integrated technology for treating wheat straw wastewater, which specifically comprises the following steps: s1, cleaning of organic substances such as suspended matters: the invention relates to the technical field of wastewater treatment, in particular to a method for treating wastewater by using a chlorine-alkali cleaning pulping process, which comprises the steps of discharging the wastewater generated by the chlorine-alkali cleaning pulping process into an adjusting tank, buffering in the adjusting tank, setting proper buffering time, adjusting the pH value of the wastewater in the adjusting tank and performing pre-aeration. The integrated technology for treating the wheat straw wastewater can form pulp under the low-temperature catalysis condition by adopting the chlor-alkali clean pulping process, the dissolution of lignin is less, the degradation reaction degree of hemicellulose and hydrolyzed saccharides and carbohydrates is lower, the chlor-alkali clean pulping process does not generate black liquor, the pollution load (COD) of the generated process liquid is lower, the chroma is small, the pH value is only 7.5-8, the emission of pollutants and refractory organic matters and the like can be effectively reduced, and the technology is green and environment-friendly and does not cause secondary pollution to the environment.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to an integrated technology for treating wheat straw wastewater.
Background
The wheat straw is a general term for the rest of the plant after harvesting wheat crops, generally comprises leaves, stems, nodes, roots and other organs, and the main components of the wheat straw are extracts (non-structural sugar, protein and the like), cellulose, hemicellulose, lignin, ash and the like. As agricultural waste, the main treatment mode at present is to directly return to the field, and the straw can also be used as industrial raw materials, feed, mushroom cultivation base materials and the like, and the straw is widely used as a renewable biomass resource at present.
The wheat straw is soft, suitable for straw weaving, and is a good raw material for producing biogas, and can also utilize the wheat straw to extract industrial starch, but the most used wheat straw is used as the raw material of straw board and paper web, the wheat straw is a good raw material for making paper and straw board through chemical treatment, the wheat straw is used for making straw board, and no machinery is needed, the quality is comparable to fiber board and sawed board, the manufacturing process comprises adding additives such as magnesium oxide and the like into water for hydrolysis and dilution, preparing a binding agent, adding the wheat straw for stirring, and enabling the wheat straw to be dry and wet uniformly, the wheat straw can also be mechanically smashed into pulp for making paper, the paper web is a material with higher consumption in the current building, the wheat straw is a main raw material for producing the paper web, and the method comprises the following steps: the method comprises the steps of adding about 20% of quick lime into wheat straws for softening, then crushing with water to obtain paper ribs, cooking the wheat straws by using sodium hydroxide and sodium sulfite in the conventional pulping and papermaking, wherein the main components of the generated black liquor comprise lignin, cellulose, hemicellulose, monosaccharide, organic acid, sodium hydroxide and the like, the pH value is generally 11.5-12.3, the black liquor is strong alkaline, the middle-section wastewater contains relatively high-concentration lignin, cellulose, resinate and other substances which are difficult to biodegrade, the black liquor is rich in organic chloride which is generated in the bleaching stage and harmful to the environment, the chroma is deep, the COD is generally 18000 and 22000mg/l, the treatment difficulty is high, once the wastewater and floaters in the wastewater are discharged to the outside, secondary pollution can be caused to the environment, and the requirements of energy conservation and environmental protection are not facilitated.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an integrated technology for treating straw wastewater, and solves the problems that organic chloride which is harmful to the environment is generated after the traditional wheat straw chemical pulping process is used for papermaking, and once the wastewater and floating objects are discharged to the outside, the environment is polluted secondarily.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the utility model provides an integrated technology of processing wheat straw waste water, relative traditional wheat straw chemical pulping process waste water COD concentration is low, and the colourity is little, and pH value is only 7.5-8, can effectively reduce the emission of pollutant and refractory organic matter etc. this integrated technology green does not cause secondary pollution to the environment, satisfies actual user demand, specifically includes following step:
s1, cleaning of organic substances such as suspended matters: the waste water generated after the chlor-alkali clean pulping process is discharged into an adjusting tank, the waste water is buffered in the adjusting tank, the proper buffering time is set, the PH value of the wastewater is regulated in the regulating tank, the pre-aeration work is carried out, the wastewater is conveyed into the high-speed spiral separator after the buffering of the period of time, the rotating speed is 300-500r/min, after most suspended matters in the wastewater and organic substances existing in the suspended matters are completely removed, the high-speed spiral separator can be closed, the regulating tank refers to a structure for regulating the flow of inlet and outlet water, in the hydropower station, the water pool with a certain adjusting volume is adapted to the load change of the hydropower station, in order to ensure that a pipe duct and a structure work normally on a sewage treatment plant and are not influenced by the peak flow rate or concentration change of wastewater, a water tank is required to be arranged in front of a wastewater treatment facility;
s2, anaerobic reaction treatment of wastewater: conveying the wastewater from which the suspended matters are removed in the step S1 to an anaerobic reactor, reacting in the anaerobic reactor for 3-5h, stopping the anaerobic reactor after most organic substances are removed under the action of anaerobic microorganisms, and recycling biogas generated in the reaction process by adopting a boiler combustion mode, wherein the anaerobic reactor firstly adopts sand as a carrier in anaerobic treatment at home and abroad, the equipment structure is an inner cylinder and an outer cylinder, and the sewage and the sand of an organic biofilm are circulated in the outer cylinder by using a special axial-flow pump to achieve the purpose of fluidization;
s3, settling and dewatering solid matter: naturally settling the suspended matters separated by the high-speed spiral separator in the S1 and the sludge generated by the anaerobic reactor in the S2, putting the impurities into a dehydration centrifugal machine after natural settling, performing dehydration treatment in the dehydration centrifugal machine, setting the centrifugal time to be 1-3h, sending solid matters generated after dehydration to an incineration plant for incineration treatment, and waiting for further treatment of the wastewater generated after dehydration;
s4, decoloring the wastewater: and (4) conveying the wastewater generated in the step S3 to a decoloring tank, adding a decoloring agent into the decoloring tank for decoloring, and after the decoloring treatment after 2-4 hours is finished, collecting the finally processed water to wait for subsequent recycling.
Preferably, the suitable buffering time in S1 is 2-3 h.
Preferably, in the anaerobic reactor in S2, a material having a large surface area, such as sand, is used as a carrier, anaerobic microorganisms are bonded to the surface of the sand or other carrier in the form of a film, and the anaerobic microorganisms flow in the sewage, and the microorganisms contact organic matter in the sewage to adsorb and decompose the organic matter.
Preferably, the decolorizer used in S4 has a decolorization ratio of 90% or more.
Preferably, the decolorizing agent in S4 is one of a flocculation decolorizing agent, an oxidation decolorizing agent or an adsorption decolorizing agent, the flocculation decolorizing agent is a quaternary amine type cationic polymer compound integrating multiple functions of decolorizing, flocculating and degrading CODcr, the adsorption decolorizing agent is generally active carbon, white clay or adsorption resin, and can directly filter impurities and oxides in oil products in a filtering manner, and the adsorption decolorizing agent integrates impurity removal, deodorization, decolorization and separation, so that the blackened oil products become light-colored transparent liquid, the acid value and the chromaticity of the processed diesel oil meet the national fuel standard, and the oxidation decolorizing agent adopts oxidizing substances, such as sodium hypochlorite, potassium permanganate, ozone and the like, to destroy colored groups to achieve the purpose of removing the chromaticity.
Preferably, the dewatering centrifuge in S3 is a machine for accelerating separation of the solid matter to be separated and the waste water by centrifugal force.
(III) advantageous effects
The invention provides an integrated technology for treating wheat straw wastewater. The method has the following beneficial effects: the integrated technology for treating the straw wastewater has the following steps of cleaning organic substances such as S1, suspended matters and the like: discharging the waste water generated by adopting the chlor-alkali cleaning pulping process into an adjusting tank, buffering in the adjusting tank, setting a proper buffering time, adjusting the pH value of the waste water in the adjusting tank, performing pre-aeration work, buffering for the period of time, conveying the waste water into a high-speed spiral separator at the rotating speed of 300-500r/min, and closing the high-speed spiral separator after most suspended matters in the waste water and organic substances existing in the suspended matter state are completely removed; s2, anaerobic reaction treatment of wastewater: conveying the wastewater from which the suspended matters are removed in the step S1 to an anaerobic reactor, reacting in the anaerobic reactor for 3-5h, stopping the anaerobic reactor after most organic substances are removed under the action of anaerobic microorganisms, and recycling the biogas generated in the reaction process by adopting a boiler combustion mode; s3, settling and dewatering solid matter: naturally settling the suspended matters separated by the high-speed spiral separator in the S1 and the sludge generated by the anaerobic reactor in the S2, putting the impurities into a dehydration centrifugal machine after natural settling, performing dehydration treatment in the dehydration centrifugal machine, setting the centrifugal time to be 1-3h, sending solid matters generated after dehydration to an incineration plant for incineration treatment, and waiting for further treatment of the wastewater generated after dehydration; s4, decoloring the wastewater: the wastewater generated in the S3 is conveyed into a decoloring tank, a decoloring agent is added into the decoloring tank for decoloring, after the decoloring treatment is finished after 2-4h, the finally processed water can be collected for later recycling, the water can be pulped under the condition of low-temperature catalysis by adopting the chlor-alkali clean pulping process, the dissolution of lignin is less, the degradation reaction degree of hemicellulose, sugars hydrolyzed by the hemicellulose and carbohydrates is lower, the chlor-alkali clean pulping process does not generate black liquor, the pollution load (COD) of the generated process liquid is lower, meanwhile, the process liquid generated in the pulping process is recycled, only a small amount of organic matters enter the subsequent working section, so that the COD concentration of the middle section water generated by the chlor-alkali clean pulping process is lower than that of the traditional wheat straw chemical pulping process, the chroma is small, the pH value is only 7.5-8, the emission of pollutants and the organic matters difficult to degrade can be effectively reduced, the integrated technology is green and environment-friendly, does not cause secondary pollution to the environment, and meets the actual use requirement.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the embodiment of the present invention provides three technical solutions: an integrated technology for treating wheat straw wastewater specifically comprises the following embodiments:
example 1
S1, cleaning of organic substances such as suspended matters: discharging waste water generated after a chlor-alkali cleaning pulping process into an adjusting tank, buffering in the adjusting tank, setting a proper buffering time, adjusting the pH value of the waste water in the adjusting tank, performing pre-aeration work, buffering for the period of time, conveying the waste water into a high-speed spiral separator at a rotating speed of 300r/min, and closing the high-speed spiral separator after most suspended matters and organic substances existing in the suspended matters in the waste water are completely removed;
s2, anaerobic reaction treatment of wastewater: conveying the wastewater from which the suspended matters are removed in the step S1 to an anaerobic reactor, reacting in the anaerobic reactor for 3 hours, stopping the anaerobic reactor after most organic substances are removed under the action of anaerobic microorganisms, and recycling the biogas generated in the reaction process by adopting a boiler combustion mode;
s3, settling and dewatering solid matter: naturally settling the suspended matters separated by the high-speed spiral separator in the S1 and the sludge generated by the anaerobic reactor in the S2, putting the impurities into a dehydration centrifugal machine after natural settling, performing dehydration treatment in the dehydration centrifugal machine, setting the centrifugal time for 1h, sending solid matters generated after dehydration to an incineration plant for incineration treatment, and waiting for further treatment of the wastewater generated after dehydration;
s4, decoloring the wastewater: and (4) conveying the wastewater generated in the step (S3) into a decoloring tank, adding a decoloring agent into the decoloring tank for decoloring, and after finishing the decoloring after 2 hours, collecting the finally processed water to wait for subsequent recycling.
Example 2
S1, cleaning of organic substances such as suspended matters: discharging waste water generated after a chlor-alkali cleaning pulping process into an adjusting tank, buffering in the adjusting tank, setting a proper buffering time, adjusting the pH value of the waste water in the adjusting tank, performing pre-aeration work, buffering for the period of time, conveying the waste water into a high-speed spiral separator at a rotating speed of 400r/min, and closing the high-speed spiral separator after most suspended matters and organic substances existing in the suspended matters in the waste water are completely removed;
s2, anaerobic reaction treatment of wastewater: conveying the wastewater from which the suspended matters are removed in the step S1 to an anaerobic reactor, reacting in the anaerobic reactor for 4 hours, stopping the anaerobic reactor after most organic substances are removed under the action of anaerobic microorganisms, and recycling the biogas generated in the reaction process by adopting a boiler combustion mode;
s3, settling and dewatering solid matter: naturally settling the suspended matters separated by the high-speed spiral separator in the S1 and the sludge generated by the anaerobic reactor in the S2, putting the impurities into a dehydration centrifugal machine after natural settling, performing dehydration treatment in the dehydration centrifugal machine, setting the centrifugal time for 2 hours, sending solid matters generated after dehydration to an incineration plant for incineration treatment, and waiting for further treatment of the wastewater generated after dehydration;
s4, decoloring the wastewater: and (4) conveying the wastewater generated in the step (S3) into a decoloring tank, adding a decoloring agent into the decoloring tank for decoloring, and after the decoloring after 3 hours is finished, collecting the finally processed water to wait for subsequent recycling.
Example 3
S1, cleaning of organic substances such as suspended matters: discharging waste water generated after a chlor-alkali cleaning pulping process into an adjusting tank, buffering in the adjusting tank, setting a proper buffering time, adjusting the pH value of the waste water in the adjusting tank, performing pre-aeration work, buffering for the period of time, conveying the waste water into a high-speed spiral separator at a rotating speed of 500r/min, and closing the high-speed spiral separator after most suspended matters and organic substances existing in the suspended matters in the waste water are completely removed;
s2, anaerobic reaction treatment of wastewater: conveying the wastewater from which the suspended matters are removed in the step S1 to an anaerobic reactor, reacting in the anaerobic reactor for 5 hours, stopping the anaerobic reactor after most organic substances are removed under the action of anaerobic microorganisms, and recycling the biogas generated in the reaction process by adopting a boiler combustion mode;
s3, settling and dewatering solid matter: naturally settling the suspended matters separated by the high-speed spiral separator in the S1 and the sludge generated by the anaerobic reactor in the S2, putting the impurities into a dehydration centrifugal machine after natural settling, performing dehydration treatment in the dehydration centrifugal machine, setting the centrifugal time for 3 hours, sending solid matters generated after dehydration to an incineration plant for incineration treatment, and waiting for further treatment of the wastewater generated after dehydration;
s4, decoloring the wastewater: and (4) conveying the wastewater generated in the step S3 to a decoloring tank, adding a decoloring agent into the decoloring tank for decoloring, and after the decoloring after 4 hours is finished, collecting the finally processed water to wait for subsequent recycling.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. An integrated technology for treating wheat straw wastewater specifically comprises the following steps:
s1, cleaning of organic substances such as suspended matters: discharging the waste water generated by adopting the chlor-alkali cleaning pulping process into an adjusting tank, buffering in the adjusting tank, setting a proper buffering time, adjusting the pH value of the waste water in the adjusting tank, performing pre-aeration work, buffering for the period of time, conveying the waste water into a high-speed spiral separator at the rotating speed of 300-500r/min, and closing the high-speed spiral separator after most suspended matters in the waste water and organic substances existing in the suspended matter state are completely removed;
s2, anaerobic reaction treatment of wastewater: conveying the wastewater from which the suspended matters are removed in the step S1 to an anaerobic reactor, reacting in the anaerobic reactor for 3-5h, stopping the anaerobic reactor after most organic substances are removed under the action of anaerobic microorganisms, and recycling the biogas generated in the reaction process by adopting a boiler combustion mode;
s3, settling and dewatering solid matter: naturally settling the suspended matters separated by the high-speed spiral separator in the S1 and the sludge generated by the anaerobic reactor in the S2, putting the impurities into a dehydration centrifugal machine after natural settling, performing dehydration treatment in the dehydration centrifugal machine, setting the centrifugal time to be 1-3h, sending solid matters generated after dehydration to an incineration plant for incineration treatment, and waiting for further treatment of the wastewater generated after dehydration;
s4, decoloring the wastewater: and (4) conveying the wastewater generated in the step S3 to a decoloring tank, adding a decoloring agent into the decoloring tank for decoloring, and after the decoloring treatment after 2-4 hours is finished, collecting the finally processed water to wait for subsequent recycling.
2. The integrated technology for treating wheat straw wastewater as claimed in claim 1, wherein the integrated technology comprises the following steps: the suitable buffering time in the S1 is 2-3 h.
3. The integrated technology for treating wheat straw wastewater as claimed in claim 1, wherein the integrated technology comprises the following steps: in the anaerobic reactor in the step S2, a large surface area material such as sand is used as a carrier, anaerobic microorganisms are bonded to the surface of the sand or other carriers in the form of a film, and the anaerobic microorganisms flow in the sewage, and the microorganisms contact with organic matters in the sewage to adsorb and decompose the organic matters.
4. The integrated technology for treating wheat straw wastewater as claimed in claim 1, wherein the integrated technology comprises the following steps: the decolorizer used in the S4 has a decolorization rate of more than 90%.
5. The integrated technology for treating wheat straw wastewater as claimed in claim 1, wherein the integrated technology comprises the following steps: the decolorizing agent in S4 is one of flocculation decolorizing agent, oxidation decolorizing agent or adsorption decolorizing agent.
6. The integrated technology for treating wheat straw wastewater as claimed in claim 1, wherein the integrated technology comprises the following steps: the dewatering centrifuge in S3 is a machine for accelerating separation of solids and wastewater to be separated by centrifugal force.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4559142A (en) * | 1983-02-17 | 1985-12-17 | Linde Aktiengesellschaft | Split feed for the anaerobic biological purification of wastewater |
| US5976375A (en) * | 1998-04-03 | 1999-11-02 | Pulp And Paper Research Institute Of Canada | Process for reducing production of biomass during activated sludge treatment of pulp and paper mill effluents |
| CN101343129A (en) * | 2008-08-15 | 2009-01-14 | 中冶华天工程技术有限公司 | Pretreatment technique for decolorization of wastewater at middle plate of paper-making pulping |
| CN101575162A (en) * | 2009-06-12 | 2009-11-11 | 广西丰林木业集团股份有限公司 | Method for treating wastewater of fibre-board plant |
| CN103466884A (en) * | 2013-09-12 | 2013-12-25 | 安徽省绿巨人环境技术有限公司 | Process for treating waste paper pulping and papermaking waste water |
-
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- 2019-09-06 CN CN201910842423.0A patent/CN110655271A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4559142A (en) * | 1983-02-17 | 1985-12-17 | Linde Aktiengesellschaft | Split feed for the anaerobic biological purification of wastewater |
| US5976375A (en) * | 1998-04-03 | 1999-11-02 | Pulp And Paper Research Institute Of Canada | Process for reducing production of biomass during activated sludge treatment of pulp and paper mill effluents |
| CN101343129A (en) * | 2008-08-15 | 2009-01-14 | 中冶华天工程技术有限公司 | Pretreatment technique for decolorization of wastewater at middle plate of paper-making pulping |
| CN101575162A (en) * | 2009-06-12 | 2009-11-11 | 广西丰林木业集团股份有限公司 | Method for treating wastewater of fibre-board plant |
| CN103466884A (en) * | 2013-09-12 | 2013-12-25 | 安徽省绿巨人环境技术有限公司 | Process for treating waste paper pulping and papermaking waste water |
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