CN107352757A - A kind of microelectrolysis processing technique of dyeing waste water - Google Patents

A kind of microelectrolysis processing technique of dyeing waste water Download PDF

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Publication number
CN107352757A
CN107352757A CN201710789945.XA CN201710789945A CN107352757A CN 107352757 A CN107352757 A CN 107352757A CN 201710789945 A CN201710789945 A CN 201710789945A CN 107352757 A CN107352757 A CN 107352757A
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China
Prior art keywords
waste water
pond
water
treatment
anaerobic
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Pending
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CN201710789945.XA
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Inventor
邓辅商
邓辅唐
曾郴林
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YUNNAN JINYE ECOLOGICAL CONSTRUCTION GROUP CO Ltd
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YUNNAN JINYE ECOLOGICAL CONSTRUCTION GROUP CO Ltd
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Priority to CN201710789945.XA priority Critical patent/CN107352757A/en
Publication of CN107352757A publication Critical patent/CN107352757A/en
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/24Treatment of water, waste water, or sewage by flotation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/28Treatment of water, waste water, or sewage by sorption
    • C02F1/283Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104Devices therefor; Their operating or servicing
    • C02F1/46176Galvanic cells
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56Macromolecular compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • C02F2101/308Dyes; Colorants; Fluorescent agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/30Nature of the water, waste water, sewage or sludge to be treated from the textile industry
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/04Flow arrangements
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment

Abstract

The invention belongs to chemical wastewater treatment field, and in particular to a kind of microelectrolysis processing technique of dyeing waste water.Flotation tank is arranged on front end and suspension in water is removed by the present invention, Fe-C micro electrolysis reaction is carried out according to waste water characteristic simultaneously, open loop, chain rupture are carried out to the pollutant of difficult for biological degradation in waste water, so as to improve the biodegradability of waste water, the effect of efficient hardening pretreatment, advantage is created for follow-up biochemical treatment;The present invention sets up diving mixer in anaerobic pond and improves waste water hydrolysis acidification degree, Flat Membrane is arranged in Aerobic Pond, utilize membrane bioreactor MBR technology, realize that HRT separates with SRT, sludge loading is lifted, stable biological treatment, water outlet SS concentration is effectively reduced and improves sewage treatment load, so as to effectively stabilize the effect of this technique biochemical treatment, stable effluent quality;The present invention is filtered using charcoal absorption in order to prevent the appearance of the unstable situation of system operation and ensures standard water discharge, ensure advanced treating effect.

Description

A kind of microelectrolysis processing technique of dyeing waste water
Technical field
The invention belongs to chemical wastewater treatment field, and in particular to a kind of microelectrolysis processing technique of dyeing waste water.
Background technology
Textile printing and dyeing industry is that China's water consumption is larger, one of more industrial department of waste discharge amount.According to incomplete system Meter, domestic daily waste discharge amount 300 ~ 4,000,000 ton of printing and dyeing enterprise.Entrainment in the waste water of discharge containing fibrous raw material in itself Slurry, postal agent, dyestuff and chemical assistant used etc. in thing, and process, there is high biochemical oxygen demand (BOD), colourity height, PH It is worth the features such as high, belongs to intractable industrial wastewater.
Textile enterprise for using the cotton produce leftover pieces based on denim reprocess fiber production, production Technique is divided into the workshop sections such as pickling, alkali cleaning, drying, selection, shredding, spinning.Produced in pickling and alkali washing process section and mainly contain indigo The acid washing water and alkali-wash waste water of the pollutants such as indigo plant.At present, the printing-dyeing waste water treatment process of this kind of textile enterprise typically uses " coagulation Pretreatment+A2The group technology of/O biological treatments+coagulating treatment+air supporting+filtering ", but water outlet COD after this PROCESS FOR TREATMENTCrMatter Amount concentration is 140 ~ 290mg/L, and colourity is 125 ~ 200 times, is unable to reach newest《Textile dyeing and finishing industrial water pollution thing discharge mark It is accurate》Requirement.
The content of the invention
For problems of the prior art, the present invention provides a kind of efficient hardening pretreatment, stable biochemical treatment, protected Hinder the microelectrolysis processing technique of the dyeing waste water of advanced treating effect.
Its technical scheme is:
A kind of microelectrolysis processing technique of dyeing waste water, is followed the steps below:
(1)Wastewater Pretreatment:
A. air-flotation process:After each plant effluent is collected, it is pumped up to flotation tank, while air is passed through into flotation tank, to useless Water carries out air-flotation process and removes suspension in water removal, and waste water residence time in flotation tank is 2h;
B. regulation is handled:Flotation tank water outlet is promoted to regulating reservoir with pump, and waste water pre-acidified, regulating reservoir is interior to carry out boring aeration, will Waste water stirs homogeneous, and waste water residence time in regulating reservoir is 36h, and regulating reservoir discharges water to iron-carbon micro-electrolysis pond;
C. microelectrolysis processing:It is 3 ~ 4 that a small amount of spent acid regulation pH value is added into iron-carbon micro-electrolysis pond, carries out iron-carbon micro-electrolysis, together When iron-carbon micro-electrolysis bottom of pond portion carry out boring aeration, waste water is 2.5h in the iron-carbon micro-electrolysis pond residence time, and water outlet afterwards is going out Regulation pH value adds aluminium polychloride, PAMA, completed by the hydraulic mixing of outlet canal to after 8 ~ 9 in water channel Preliminary sedimentation tank is flowed into after coagulation process;
Small galvanic cell is formed using acidity in water and iron charcoal, by micro-electrolysis reaction to being difficult to biodegradable pollution in waste water Thing carries out open loop, chain rupture, so as to improve the biodegradability of waste water.
D. precipitation process:Waste water precipitates 4 ~ 5h in preliminary sedimentation tank, and supernatant water outlet is promoted in anaerobic pond by pump,;
(2)Biochemical treatment:
A. Anaerobic Treatment:Waste water carries out anaerobic reaction in anaerobic pond, is provided with more diving mixers in anaerobic pond, waste water is stirred Mix uniformly, promote waste water hydrolysis acidification in anaerobic pond, retention time of sewage 30h;
B. anoxic treatment:Anaerobic pond overflow is discharged water in anoxic pond, waste water denitrogenation dephosphorizing in anoxic pond, by organic of macromolecular Grain resolves into small molecule organic granular, retention time of sewage 4h;
C. Aerobic Process for Treatment:Anoxic pond is discharged water in Aerobic Pond, carries out aeration Aerobic Process for Treatment, and Flat Membrane is arranged in Aerobic Pond, aerobic Flat Membrane is arranged in pond, Aerobic Pond utilizes membrane bioreactor(MBR)Technology, realize that HRT separates with SRT, lift sludge concentration, Stable biological treatment, effectively reduce water outlet SS concentration and improve sewage treatment load;Retention time of sewage is 19h, while aerobic In pond in backflow mixed liquor to anoxic pond, denitrification is carried out, denitrogenation processing is carried out to waste water;
(3)Advanced treating:
Precipitated in Aerobic Pond water outlet overflow to intermediate pool, standard water discharge is discharged after precipitation, through pump if water outlet is below standard It is promoted in active carbon filter, standard water discharge is discharged after charcoal absorption is filtered;Precipitating sludge in intermediate pool passes through Sludge reflux pump lifting is back to supplement suspended sludge in anaerobic pond, promotes microorganism in anaerobic pond to carry out anaerobic respiration;
(4)Treatment of Sludge
Flotation tank, preliminary sedimentation tank and sludge caused by Aerobic Pond flow into sludge-tank, then through being carried out in sludge pumping to plate compression pond After filter-press dehydration, caused dry mud cake outward transport.
Further, it is disposed with boring aeration pipe in the regulating reservoir.
Further, the bottom of pond in the iron-carbon micro-electrolysis pond is disposed with boring aeration pipe, and upper strata sets supporting layer, according to iron carbon Mass ratio 2:1 laying forms 2m thickness packed beds.
Further, boring aeration pipe and air blower are provided with the Aerobic Pond.
Further, the filtering velocity of the active carbon filter is 5 ~ 8m/h.
Beneficial effects of the present invention are:
(1)Flotation tank is arranged on front end and suspension in water is removed by the present invention, while carries out iron according to waste water characteristic Charcoal micro-electrolysis reaction, open loop, chain rupture are carried out to the pollutant of difficult for biological degradation in waste water, so as to improve the biodegradability of waste water, The effect of efficient hardening pretreatment, advantage is created for follow-up biochemical treatment;
(2)The present invention sets up diving mixer in anaerobic pond and improves waste water hydrolysis acidification degree, and flat board is arranged in Aerobic Pond Film, using membrane bioreactor MBR technology, realize that HRT separates with SRT, lift sludge loading, effectively stable biological treatment, drop Low water outlet SS concentration simultaneously improves sewage treatment load, so as to effectively stabilize the effect of this technique biochemical treatment, stable water outlet water Matter;
(3)The present invention is filtered using charcoal absorption in order to prevent the appearance of the unstable situation of system operation and ensures standard water discharge, Ensure advanced treating effect;
(4)Water outlet COD after the weak electrolysis mechanism processing of the present inventionCrMass concentration be 60 ~ 90mg/L, NH3-N mass concentrations 5 ~ 8mg/L, meets the requirement of newest discharge standard, and effluent color dilution is up to standard.
Brief description of the drawings
Fig. 1 is the microelectrolysis processing process chart of the present invention.
Embodiment
As shown in figure 1, a kind of microelectrolysis processing technique of dyeing waste water, is followed the steps below:
(1)Wastewater Pretreatment:
A. air-flotation process:After each plant effluent is collected, it is pumped up to flotation tank, while air is passed through into flotation tank, to useless Water carries out air-flotation process and removes suspension in water removal, and waste water residence time in flotation tank is 2h;
B. regulation is handled:Flotation tank water outlet is promoted to regulating reservoir with pump, waste water pre-acidified, and boring aeration is disposed with regulating reservoir Pipe,
Boring aeration is carried out in regulating reservoir, waste water is stirred into homogeneous, waste water residence time in regulating reservoir is 36h, and regulating reservoir goes out Water is to iron-carbon micro-electrolysis pond;
C. microelectrolysis processing:The bottom of pond in iron-carbon micro-electrolysis pond is disposed with boring aeration pipe, and upper strata sets supporting layer, according to iron carbonaceous Measure ratio 2:1 laying forms 2m thickness packed beds;It is 3 ~ 4 that a small amount of spent acid regulation pH value is added into iron-carbon micro-electrolysis pond, carries out iron carbon Light electrolysis, while iron-carbon micro-electrolysis bottom of pond portion carries out boring aeration, waste water is 2.5h in the iron-carbon micro-electrolysis pond residence time, afterwards Water outlet adjusts pH value to after 8 ~ 9 in outlet canal, aluminium polychloride, PAMA is added, by the waterpower of outlet canal Stirring flows into preliminary sedimentation tank after completing coagulation process;
D. precipitation process:Waste water precipitates 4 ~ 5h in preliminary sedimentation tank, and supernatant water outlet is promoted in anaerobic pond by pump,;
(2)Biochemical treatment:
A. Anaerobic Treatment:Waste water carries out anaerobic reaction in anaerobic pond, is provided with more diving mixers in anaerobic pond, waste water is stirred Mix uniformly, promote waste water hydrolysis acidification in anaerobic pond, retention time of sewage 30h;
B. anoxic treatment:Anaerobic pond overflow is discharged water in anoxic pond, waste water denitrogenation dephosphorizing in anoxic pond, by organic of macromolecular Grain resolves into small molecule organic granular, retention time of sewage 4h;
C. Aerobic Process for Treatment:Anoxic pond is discharged water in Aerobic Pond, carries out aeration Aerobic Process for Treatment, be provided with Aerobic Pond boring aeration pipe and Air blower, Flat Membrane is arranged in Aerobic Pond, Aerobic Pond utilizes membrane bioreactor(MBR)Technology, realize that HRT separates with SRT, give up Water retention time is 19h, while in Aerobic Pond in backflow mixed liquor to anoxic pond, carries out denitrification, waste water is taken off Nitrogen processing;
(3)Advanced treating:
Precipitated in Aerobic Pond water outlet overflow to intermediate pool, standard water discharge is discharged after precipitation, through pump if water outlet is below standard It is promoted in active carbon filter, standard water discharge is discharged after charcoal absorption is filtered;The filtering velocity of the active carbon filter is 5 ~8m/h.Precipitating sludge in intermediate pool is back in anaerobic pond by sludge reflux pump lifting supplements suspended sludge, promotes to detest Microorganism carries out anaerobic respiration in oxygen pond;
(4)Treatment of Sludge
Flotation tank, preliminary sedimentation tank and sludge caused by Aerobic Pond flow into sludge-tank, then through being carried out in sludge pumping to plate compression pond After filter-press dehydration, caused dry mud cake outward transport.
The microelectrolysis processing technique of the dyeing waste water produces a desired effect to the clearance of pollutant, CODCrWith This two indexs of NH3-N take clearance to respectively reach 95% and more than 83%.

Claims (5)

1. the microelectrolysis processing technique of a kind of dyeing waste water, it is characterised in that follow the steps below:
(1)Wastewater Pretreatment:
A. air-flotation process:After each plant effluent is collected, it is pumped up to flotation tank, while air is passed through into flotation tank, to useless Water carries out air-flotation process and removes suspension in water removal, and waste water residence time in flotation tank is 2h;
B. regulation is handled:Flotation tank water outlet is promoted to regulating reservoir with pump, and waste water pre-acidified, regulating reservoir is interior to carry out boring aeration, will Waste water stirs homogeneous, and waste water residence time in regulating reservoir is 36h, and regulating reservoir discharges water to iron-carbon micro-electrolysis pond;
C. microelectrolysis processing:It is 3 ~ 4 that a small amount of spent acid regulation pH value is added into iron-carbon micro-electrolysis pond, carries out iron-carbon micro-electrolysis, together When iron-carbon micro-electrolysis bottom of pond portion carry out boring aeration, waste water is 2.5h in the iron-carbon micro-electrolysis pond residence time, and water outlet afterwards is going out Regulation pH value adds aluminium polychloride, PAMA, completed by the hydraulic mixing of outlet canal to after 8 ~ 9 in water channel Preliminary sedimentation tank is flowed into after coagulation process;
D. precipitation process:Waste water precipitates 4 ~ 5h in preliminary sedimentation tank, and supernatant water outlet is promoted in anaerobic pond by pump,;
(2)Biochemical treatment:
A. Anaerobic Treatment:Waste water carries out anaerobic reaction in anaerobic pond, is provided with more diving mixers in anaerobic pond, waste water is stirred Mix uniformly, promote waste water hydrolysis acidification in anaerobic pond, retention time of sewage 30h;
B. anoxic treatment:Anaerobic pond overflow is discharged water in anoxic pond, waste water denitrogenation dephosphorizing in anoxic pond, by organic of macromolecular Grain resolves into small molecule organic granular, retention time of sewage 4h;
C. Aerobic Process for Treatment:Anoxic pond is discharged water in Aerobic Pond, carries out aeration Aerobic Process for Treatment, and Flat Membrane is disposed with Aerobic Pond, real Existing HRT separates with SRT, retention time of sewage 19h, while in Aerobic Pond in backflow mixed liquor to anoxic pond, carries out denitrification Effect, denitrogenation processing is carried out to waste water;
(3)Advanced treating:
Precipitated in Aerobic Pond water outlet overflow to intermediate pool, standard water discharge is discharged after precipitation, through pump if water outlet is below standard It is promoted in active carbon filter, standard water discharge is discharged after charcoal absorption is filtered;Precipitating sludge in intermediate pool passes through Sludge reflux pump lifting is back to supplement suspended sludge in anaerobic pond, promotes microorganism in anaerobic pond to carry out anaerobic respiration;
(4)Treatment of Sludge
Flotation tank, preliminary sedimentation tank and sludge caused by Aerobic Pond flow into sludge-tank, then through being carried out in sludge pumping to plate compression pond After filter-press dehydration, caused dry mud cake outward transport.
2. the microelectrolysis processing technique of a kind of dyeing waste water according to claim 1, it is characterised in that in the regulating reservoir It is disposed with boring aeration pipe.
A kind of 3. microelectrolysis processing technique of dyeing waste water according to claim 1, it is characterised in that the micro- electricity of iron carbon Xie Chi bottom of pond is disposed with boring aeration pipe, and upper strata sets supporting layer, according to iron carbon mass ratio 2:1 laying forms 2m thickness fillers Bed.
4. the microelectrolysis processing technique of a kind of dyeing waste water according to claim 1, it is characterised in that in the Aerobic Pond Provided with boring aeration pipe and air blower.
A kind of 5. microelectrolysis processing technique of dyeing waste water according to claim 1, it is characterised in that the activated carbon mistake The filtering velocity of filter is 5 ~ 8m/h.
CN201710789945.XA 2017-09-05 2017-09-05 A kind of microelectrolysis processing technique of dyeing waste water Pending CN107352757A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108083570A (en) * 2017-12-21 2018-05-29 浙江创伟竹业开发有限公司 A kind of bamboo wood heat treatment spent liquor processing method
CN108164060A (en) * 2018-01-31 2018-06-15 常州市武进天工机械制造有限公司 A kind of printing and dyeing secondary settlement waste water treatment process
CN109574403A (en) * 2018-12-28 2019-04-05 新疆天蓝水清环境服务有限公司 A kind for the treatment of process of dyeing synthetic wastewater
CN110395856A (en) * 2019-09-04 2019-11-01 河北逾净环保科技有限公司 A kind of processing method of electrophoretic-coating wastewater
CN110776208A (en) * 2019-11-21 2020-02-11 江苏蓝必盛化工环保股份有限公司 Treatment process of mixed wastewater containing 2B oil, 2B acid and 4B acid
CN113480113A (en) * 2021-09-06 2021-10-08 江苏通海染整有限公司 Azo printing and dyeing wastewater treatment process

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108083570A (en) * 2017-12-21 2018-05-29 浙江创伟竹业开发有限公司 A kind of bamboo wood heat treatment spent liquor processing method
CN108164060A (en) * 2018-01-31 2018-06-15 常州市武进天工机械制造有限公司 A kind of printing and dyeing secondary settlement waste water treatment process
CN109574403A (en) * 2018-12-28 2019-04-05 新疆天蓝水清环境服务有限公司 A kind for the treatment of process of dyeing synthetic wastewater
CN110395856A (en) * 2019-09-04 2019-11-01 河北逾净环保科技有限公司 A kind of processing method of electrophoretic-coating wastewater
CN110776208A (en) * 2019-11-21 2020-02-11 江苏蓝必盛化工环保股份有限公司 Treatment process of mixed wastewater containing 2B oil, 2B acid and 4B acid
CN113480113A (en) * 2021-09-06 2021-10-08 江苏通海染整有限公司 Azo printing and dyeing wastewater treatment process
CN113480113B (en) * 2021-09-06 2021-11-16 江苏通海染整有限公司 Azo printing and dyeing wastewater treatment process

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