CN103641278A - System and method for treating purified cotton production wastewater by adopting anoxic processes - Google Patents
System and method for treating purified cotton production wastewater by adopting anoxic processes Download PDFInfo
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to a system and method for treating purified cotton production wastewater by adopting anoxic processes and belongs to the field of wastewater treatment. The system disclosed by the invention comprises a thick black liquor storage tank, a dilute black liquor storage tank, an acidic water storage tank, a blending pool, an anoxic tank, an anoxic precipitation tank, an aerobic pool, an aerobic precipitation tank and a coagulative precipitation tank. According to the system and the method, through treating purified cotton black liquor by the anoxic processes, the COD (Chemical Oxygen Demand) of aerobic influent and effluent is lowered greatly, so that the dosage for coagulative precipitation is reduced, and the operating cost is reduced greatly while the emission standard is improved.
Description
Technical field
The present invention relates to a kind for the treatment of system and method that adopts anoxic process to process purified cotton factory effluent, belong to field of waste water treatment.
Background technology
Linters be take as raw material production purified cotton in certain nitro-cotton company, then by purified cotton, is produced the enterprise of nitro-cotton.Purified cotton can produce a large amount of alkaline waste waters in process of production, this alkaline waste water is referred to as " black liquor ", black liquor is divided into two portions according to the operation difference producing, and linters adds alkaline boiling process and produces concentrated black liquid, and the linters of boiling produces rare black liquor at squeezing washing process.This alkaline waste water is colloidal solution, mainly contains fat, protein, pectin, tannin, the material of the difficult degradeds such as xylogen, hemicellulose, has that COD is high, colourity is high, SS high, BOD/COD ≈ 0.3, belong to reluctantly can be biochemical waste water.Nitro-cotton discharges in process of production acid waste water and is referred to as " plain boiled water ", and principal pollutant are sulfuric acid and nitric acid, and gas chromatography and mineral compound, has the features such as acidity height and suspended substance height
The method of the purified cotton of traditional technology processing at present black liquor is: by purified cotton black liquor acid out precipitation, the sour water of generation, by after neutralizing, enters anaerobism, aerobic, second pond biochemical system successively, finally passes through aluminate coagulating.
Mainly there is following shortcoming in this treatment process: owing to containing a large amount of vitriol in the purified cotton black liquor after acid out, part of sulfuric acid salt is reduced to elemental sulfur by sulphate reducing bacteria in anaerobic process, and then continued to be reduced to the sulphur of negative divalence, the S in water
2-during concentration>=50mg/L, can suppress the growth of anerobe, reduce anaerobic unit processing efficiency; When the concentration of hydrogen sulfide in water surpasses its solubility range, will overflow with the form of gas, have secondary pollution problem, affect Air quality.Due to anaerobic pond S
2-concentration is high, cause anaerobism efficiency low, cause Aerobic Pond load too high, biological degradation is not thorough, make follow-up materialization processing add dose larger, processing cost is higher, relies on dosing can stablize the emission standard that reaches fiery explosive > > (GB14470.1-2002) table 1 of < < weapon industry pollution discharge standard, i.e. COD
cr≤ 300mg/L, BOD
5the standard of≤100mg/L, SS≤150mg/L, colourity≤200 times, pH:6～9.Production along with enterprise's product innovation, existing emission standard need to upgrade to the emission standard of < < weapon industry pollution discharge standard fire explosive > > (GB14470.1-2002) table 2, i.e. COD
cr≤ 150mg/L, BOD
5≤ 60mg/L, SS≤100mg/L, colourity≤80 times, pH:6～9; And local environmental administration is according to the supporting capacity of local environment, wish that enterprise can reach the requirement of < < composite wastewater emission standard > > (GB8978-1996) table 2 primary standard.Therefore, need to be optimized current technology.
Summary of the invention
The object of the invention is to solve traditional technology in processing purified cotton black liquor process, exist anaerobic treatment efficiency low, produce hydrogen sulfide foul smell cause secondary pollution, coagulating sedimentation working cost high, process the problems such as index can not meet the demands, thereby a kind for the treatment of system and method that adopts anoxic process to process purified cotton factory effluent is provided.
The object of the invention is to be achieved through the following technical solutions:
A kind for the treatment of system that adopts anoxic process to process purified cotton factory effluent of the present invention, this system comprises: concentrated black liquid storage pond, rare black liquor storage pond, sour water store up pond, blend pond, anoxic pond, anoxic settling tank, Aerobic Pond, aerobic sedimentation tank, coagulative precipitation tank.
Concentrated black liquid storage pond is used for storing purified cotton concentrated black liquid, inside establishes pneumatic blending, plays even water quality and water yield effect;
Rare black liquor storage pond is used for storing the rare black liquor of purified cotton, inside establishes pneumatic blending, plays even water quality and water yield effect;
Sour water storage pond is used for storing nitro-cotton sour water, inside establishes pneumatic blending, plays even water quality and water yield effect;
Blend pond for regulating the reaction tank of waste water ph; Blend pH real-time monitoring device and aeration stirrer are set in pond; Wherein, acid-base modifier throwing device is thrown in acid-base modifier automatically according to the pH pre-determined range of pH real-time monitoring device setting, and the pH of pending waste water is adjusted to pH pre-determined range.
Anoxic pond inside arranges anaerobism combined stuffing and aerating apparatus, and combined stuffing is denitrifying bacterium and amphimicrobe filler; Aerating apparatus provides the environment of a micro-oxygen for bacterium.
Anoxic settling tank carries out mud-water separation to anoxic pond water outlet, removes the suspended substance that anoxic process produces.
Aerobic Pond inside sets supports combined stuffing and aerating apparatus, utilizes aerobe further to process the organism in degrading waste water.
Aerobic sedimentation tank carries out mud-water separation to Aerobic Pond water outlet, removes the suspended substance that aerobic processes produces.
Coagulative precipitation tank is provided with flocculation agent throwing device and whipping appts, mainly utilizes COD, colourity that the further removal of materialization effect can not be biochemical.
Concentrated black liquid storage pond, sour water storage tank pond and blending between pond is connected with pipeline with pump, blends between pond and anoxic pond and is connected with pump, under meter and pipeline, connected with pipeline between anoxic pond, anoxic settling tank, Aerobic Pond, aerobic sedimentation tank, coagulative precipitation tank.Between rare black liquor storage pond and Aerobic Pond, with pump, flow, taking into account pipeline is connected.
A kind for the treatment of process that adopts anoxic process to process purified cotton factory effluent of the present invention, concrete treatment step is as follows:
1) concentrated black liquid that purified cotton production cooking process produces enters concentrated black liquid storage pond, sour water in nitro-cotton production process enters sour water storage pond, by two kinds of waste water liftings, to blending pond, according to the volume ratio of concentrated black liquid and sour water, be 1: 3～5 to blend, the pH that makes blending liquid is 1～4.Rare black liquor that purified cotton washing produces enters rare black liquor storage pond.
2) by through 1) step pH value regulates the waste water lifting after processing to enter anoxic pond, make carbon source and the nitrate nitrogen in sour water in concentrated black liquid carry out heterotrophic denitrification under anaerobism combined stuffing environment, the dissolved oxygen of controlling denitrification process is <1.0mg/L; By the reaction solution pH adding in water management pond, remain on 6-9, reach denitrogenation, degraded COD, reclaim basicity and reduce the objects such as sulfate radical is reduced.
3) through 2) waste water after step is processed is from flowing into anoxic settling tank, by settling tank, realizes mud-water separation.
4) through 3) waste water after processing and the rare black liquor in rare black liquor storage pond be promoted to Aerobic Pond, and two kinds of waste water mix according to anoxic pond water outlet and the rare black liquor volume ratio of 2: 1 at Aerobic Pond, and further degradation of organic substances, until that BOD≤5mg/L finishes is aerobic.
5) through 4) waste water after processing is from flowing into aerobic sedimentation tank, carries out mud-water separation.
6) through 5) waste water after processing is from flowing into coagulative precipitation tank, and by adding the liquid polymeric ferric sulfate that accounts for cumulative volume 1.5 ‰, the reaction times more than 15 minutes, is carried out mud-water separation, discharged wastewater met the national standard.
Beneficial effect
Method of the present invention is processed purified cotton black liquor with anoxic process, compare with current technology, anoxic process COD clearance has improved 47.5%, by anoxic, helped sulfuration bacterium, weakened the breeding of sulphate reducing bacteria, having reduced the concentration of solvability sulfide in anaerobic system, thereby made rotten-egg odour gas---hydrogen sulfide disappears.Adopt anoxic process to strengthen the stability of system operation, reduced running cost.Adopt device and method of the present invention to process, indices is better than < < weapon industry pollution discharge standard fire explosive > > (GB14470.1-2002) table 2 effluent standard, i.e. COD
cr≤ 150mg/L, BOD5≤60mg/L, SS≤100mg/L, colourity≤80 times, pH are 6～9, can stable reach the requirement of < < integrated wastewater discharge standard > > (GB8978-1996) primary standard, i.e. COD
cr≤ 100mg/L, BOD5≤30mg/L, SS≤100mg/L, colourity≤50 times, pH are 6～9.
Accompanying drawing explanation
Fig. 1 is the treating processes schematic diagram of purified cotton production wastewater treatment system of the present invention;
Embodiment
Below in conjunction with drawings and Examples, content of the present invention is further described.
Embodiment
The purified cotton factory effluent that Yi Mou nitro-cotton company discharges is for processing object, and its parameters is: purified cotton waste water COD=6000～7000mg/L, BOD=1800～2100mg/L, B/C=0.3, basicity=2500～5500mg/L; Nitro-cotton waste water COD=200～1000mg/L, sulfate radical=3700～4100mg/L, BOD=90～450mg/L, B/C=0.45, acidity=4000～14000mg/L.
Adopt apparatus of the present invention and method to carry out comprehensive treating process to above-mentioned nitro-cotton factory effluent; Concrete treating processes is as follows:
1) in purified cotton production process, purified cotton concentrated black liquid enters concentrated black liquid storage pond, and the sour water in nitro-cotton production process enters sour water storage pond, by storage, stirs after balanced water quality and quantity, and by two kinds of waste water liftings, to blending pond, the pH that blends pond remains on 1～4.Blend pond the online chain controller of pH and whipping appts are housed, pH exceeds this scope and adds sour water, lower than this scope, adds concentrated black liquid.Rare black liquor that purified cotton washing produces enters rare black liquor storage pond.
2) by through 1) step pH value regulates the waste water lifting after processing to enter anoxic pond, make carbon source and the nitrate nitrogen in sour water in concentrated black liquid carry out heterotrophic denitrification under anaerobism combined stuffing environment, the dissolved oxygen of controlling denitrification process is <1.0mg/L.PH in pond remains on 6-9, and the pH of intaking during pH>9 reduces; During pH<6, water inlet pH raises.By anoxic process, reach denitrogenation, degraded COD, reclaim basicity and reduce the objects such as sulfate radical is reduced.
3) through 2) waste water after step is processed is from flowing into anoxic settling tank, by settling tank, realizes mud-water separation.Every 8 hours spoil disposals of anoxic settling tank 1 time, the culturing bacterium phase is supplemented bacterial classification by sludge reflux to anoxic pond, and after normal operation, excess sludge enters the sludge sump of sewage plant.
4) through 3) waste water after processing enters Aerobic Pond, and rare black liquor is promoted to Aerobic Pond, and two kinds of waste water mix according to volume ratio at Aerobic Pond at 2: 1, further degradation of organic substances.The dissolved oxygen of controlling Aerobic Pond is >2.0mg/L and <5.0mg/L, aeration when dissolved oxygen <2mg/L.
5) through 4) waste water after processing is from flowing into aerobic sedimentation tank, carries out mud-water separation.Every 12 hours spoil disposals of aerobic sedimentation tank 1 time, the culturing bacterium phase is back to Aerobic Pond and supplements bacterial classification, and after normal operation, excess sludge enters the sludge sump of sewage plant.
6) through 5) waste water after processing is from flowing into coagulative precipitation tank, by adding, accounts for the 1.5 ‰ liquid polymeric ferric sulfate reaction times of cumulative volume more than 15 minutes, carries out mud-water separation, discharged wastewater met the national standard.Every 6 hours spoil disposals of coagulative precipitation tank 1 time, enter the sludge sump of sewage plant.
Adopt front and back contrast effect that system and method for the present invention processes purified cotton factory effluent as following table:
Table 1 anoxic process test example and anaerobic technique Embodiment C OD contrast effect
Table 2 anoxic and existing anaerobic technique sulfate reduction effect comparison effect
Table 3 embodiment anaerobism+aerobic+mixed depositing technology effect (COD≤150mg/L)
Table 4 test example anoxic+aerobic+coagulation-settlement process effect (COD≤100mg/L)
Method of the present invention is processed purified cotton black liquor with anoxic process, compares with embodiment, and sulfate reduction rate reduces by 40.02%, COD clearance and improves 47.5%.Because of the raising of anoxic effect, cause the significantly reduction of aerobic water inlet and water outlet COD, thereby saved coagulation precipitation dispensing amount, when improving emission standard, significantly cut down working cost.
Claims (2)
1. adopt anoxic process to process a treatment system for purified cotton factory effluent, it is characterized in that: this system comprises concentrated black liquid storage pond, rare black liquor storage pond, sour water storage pond, blends pond, anoxic pond, anoxic settling tank, Aerobic Pond, aerobic sedimentation tank, coagulative precipitation tank;
Concentrated black liquid storage pond is used for storing purified cotton concentrated black liquid, inside establishes pneumatic blending;
Rare black liquor storage pond is used for storing the rare black liquor of purified cotton, inside establishes pneumatic blending;
Sour water storage pond is used for storing nitro-cotton sour water, inside establishes pneumatic blending;
Blend pond for regulating the reaction tank of waste water ph; Blend pH real-time monitoring device and aeration stirrer are set in pond; Wherein, acid-base modifier throwing device is thrown in acid-base modifier automatically according to the pH pre-determined range of pH real-time monitoring device setting, and the pH of pending waste water is adjusted to pH pre-determined range;
Anoxic pond inside arranges anaerobism combined stuffing and aerating apparatus, and combined stuffing is denitrifying bacterium and amphimicrobe filler;
Anoxic settling tank carries out mud-water separation to anoxic pond water outlet, removes the suspended substance that anoxic process produces;
Aerobic Pond inside sets supports combined stuffing and aerating apparatus;
Aerobic sedimentation tank carries out mud-water separation to Aerobic Pond water outlet, removes the suspended substance that aerobic processes produces;
Coagulative precipitation tank is provided with flocculation agent throwing device and whipping appts;
Concentrated black liquid storage pond, sour water storage tank pond and blending between pond is connected with pipeline with pump, blends between pond and anoxic pond and is connected with pump, under meter and pipeline, connected with pipeline between anoxic pond, anoxic settling tank, Aerobic Pond, aerobic sedimentation tank, coagulative precipitation tank; Between rare black liquor storage pond and Aerobic Pond, with pump, flow, taking into account pipeline is connected.
2. adopt anoxic process to process a treatment process for purified cotton factory effluent, it is characterized in that: concrete treatment step is as follows:
1) concentrated black liquid that purified cotton production cooking process produces enters concentrated black liquid storage pond, sour water in nitro-cotton production process enters sour water storage pond, by two kinds of waste water liftings, to blending pond, according to the volume ratio of concentrated black liquid and sour water, be that blend 1:3～5, the pH that makes blending liquid is 1～4; Rare black liquor that purified cotton washing produces enters rare black liquor storage pond;
2) by through 1) step pH value regulates the waste water lifting after processing to enter anoxic pond, make carbon source and the nitrate nitrogen in sour water in concentrated black liquid carry out heterotrophic denitrification under anaerobism combined stuffing environment, the dissolved oxygen of controlling denitrification process is <1.0mg/L; By the reaction solution pH adding in water management pond, remain on 6-9;
3) through 2) waste water after step is processed is from flowing into anoxic settling tank, by settling tank, realizes mud-water separation;
4) through 3) waste water after processing and the rare black liquor in rare black liquor storage pond be promoted to Aerobic Pond, and two kinds of waste water mix according to anoxic pond water outlet and the rare black liquor volume ratio of 2: 1 at Aerobic Pond, until that BOD≤5mg/L finishes is aerobic;
5) through 4) waste water after processing is from flowing into aerobic sedimentation tank, carries out mud-water separation;
6) through 5) waste water after processing is from flowing into coagulative precipitation tank, and by adding the liquid polymeric ferric sulfate that accounts for cumulative volume 1.5 ‰, the reaction times more than 15 minutes, is carried out mud-water separation, discharged wastewater met the national standard.
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| CN104355461A (en) * | 2014-12-03 | 2015-02-18 | 四川北方硝化棉股份有限公司 | Method for preprocessing strong black liquor |
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| CN112573766A (en) * | 2020-11-27 | 2021-03-30 | 北方化学工业股份有限公司 | Nitrocellulose wastewater treatment system and treatment method |
| CN119176620A (en) * | 2024-11-25 | 2024-12-24 | 中国市政工程西南设计研究总院有限公司 | Rural sewage treatment system based on wind-solar complementary power generation low power consumption |
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