CN113480113B - Azo printing and dyeing wastewater treatment process - Google Patents
Azo printing and dyeing wastewater treatment process Download PDFInfo
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- CN113480113B CN113480113B CN202111038318.5A CN202111038318A CN113480113B CN 113480113 B CN113480113 B CN 113480113B CN 202111038318 A CN202111038318 A CN 202111038318A CN 113480113 B CN113480113 B CN 113480113B
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- 238000000034 method Methods 0.000 title claims abstract description 115
- 230000008569 process Effects 0.000 title claims abstract description 111
- 238000004043 dyeing Methods 0.000 title claims abstract description 32
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 15
- 239000010802 sludge Substances 0.000 claims abstract description 23
- 230000009467 reduction Effects 0.000 claims abstract description 20
- 238000001179 sorption measurement Methods 0.000 claims abstract description 20
- 230000020477 pH reduction Effects 0.000 claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000005374 membrane filtration Methods 0.000 claims abstract description 10
- 239000006228 supernatant Substances 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 208000005156 Dehydration Diseases 0.000 claims description 15
- 230000018044 dehydration Effects 0.000 claims description 15
- 238000006297 dehydration reaction Methods 0.000 claims description 15
- 238000000108 ultra-filtration Methods 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 238000001471 micro-filtration Methods 0.000 claims description 9
- 230000003647 oxidation Effects 0.000 claims description 9
- 238000007254 oxidation reaction Methods 0.000 claims description 9
- 230000003851 biochemical process Effects 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 3
- 210000002421 cell wall Anatomy 0.000 claims description 2
- 239000003245 coal Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 claims 1
- 239000002351 wastewater Substances 0.000 abstract description 22
- 239000000987 azo dye Substances 0.000 abstract description 7
- 239000000975 dye Substances 0.000 abstract description 7
- 244000005700 microbiome Species 0.000 abstract description 6
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 231100000331 toxic Toxicity 0.000 abstract description 4
- 230000002588 toxic effect Effects 0.000 abstract description 4
- 230000002378 acidificating effect Effects 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 description 14
- 238000005868 electrolysis reaction Methods 0.000 description 8
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- XWZDJOJCYUSIEY-UHFFFAOYSA-L disodium 5-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-4-hydroxy-3-phenyldiazenylnaphthalene-2,7-disulfonate Chemical compound [Na+].[Na+].Oc1c(N=Nc2ccccc2)c(cc2cc(cc(Nc3nc(Cl)nc(Cl)n3)c12)S([O-])(=O)=O)S([O-])(=O)=O XWZDJOJCYUSIEY-UHFFFAOYSA-L 0.000 description 4
- STZCRXQWRGQSJD-GEEYTBSJSA-M methyl orange Chemical compound [Na+].C1=CC(N(C)C)=CC=C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-GEEYTBSJSA-M 0.000 description 4
- 229940012189 methyl orange Drugs 0.000 description 4
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000003440 toxic substance Substances 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 241000589651 Zoogloea Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000002306 biochemical method Methods 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 239000010919 dye waste Substances 0.000 description 1
- 238000003411 electrode reaction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- -1 iron ions Chemical class 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46176—Galvanic cells
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
- C02F1/705—Reduction by metals
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/341—Consortia of bacteria
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The scheme relates to an azo printing and dyeing wastewater treatment process, which sequentially comprises biological adsorption treatment, wall breaking treatment, anaerobic acidification, reduction treatment and membrane filtration treatment, wherein the printing and dyeing wastewater containing azo dyes is subjected to biological adsorption treatment, more than 70% of the azo dyes are adsorbed on the surfaces of zoogles due to the huge specific surface area of microorganisms, the sludge adsorbed with dye pollutants is subjected to ultrasonic wall breaking treatment, the toxic and harmful dyes and the slurry obtained after the microorganisms are crushed are fully mixed, the mixture is conveyed to the anaerobic acidification process for treatment, when the pH value is reduced to 4.5-6.3, the supernatant in an anaerobic acidification tank is conveyed to the reduction treatment process for reduction treatment, and zero-valent iron is used for reducing the azo dyes under the acidic anaerobic condition, so that azo bonds are broken and the chromaticity is reduced.
Description
Technical Field
The invention belongs to the field of printing and dyeing wastewater treatment, and particularly relates to an azo printing and dyeing wastewater treatment process.
Background
With the rapid development of textile industry, the discharge amount of printing and dyeing wastewater is huge, the printing and dyeing wastewater has the characteristics of high organic matter concentration, high chromaticity, high inorganic salt content, complex components, poor biodegradability and the like, and the discharge of the printing and dyeing wastewater causes serious pollution to water environment due to low treatment rate. Dyes have a complex structure, many are variants, the sources of which are wide, most of the dyes are made of carcinogens, and if discharged into water without treatment, studies have shown that some dyes accumulate continuously through the food chain. Although possibly at a low concentration, it can still adversely affect the human body if it enters the body through the food chain. For this reason, the dye waste water must be properly treated.
CN112079427A discloses a method for degrading organic pollutants by zero-valent iron catalytic degradation, which comprises adding iron powder and persulfate into organic wastewater, and carrying out ultrasonic treatment to degrade the organic pollutants. Persulfate is used as a strong oxidant, and is added into printing and dyeing wastewater, because the persulfate does not have specific oxidation characteristics, organic matters in the wastewater can react with the persulfate, the treatment cost is high, the efficiency is low, and the persulfate is difficult to be used in the printing and dyeing wastewater on a large scale;
CN101624250B discloses a sewage treatment method of anaerobic zero-valent iron, in which the zero-valent iron in an anaerobic reactor releases Fe by means of internal electrolysis, organic acid neutralization and the like2+The zero-valent iron containing inert materials such as carbon and the like is used as a cathode and the iron is used as an anode in the reaction process to form an electrode reaction, but in the process of treating printing and dyeing wastewater by the process, the toxic action of azo fuels is generatedTherefore, the reaction efficiency is greatly reduced, and even the degradable substances in the printing and dyeing wastewater are difficult to degrade.
The processes for printing and dyeing wastewater by using zero-valent iron as a reducing agent all have a significant problem, namely, in the actual wastewater treatment process, the refractory organic matters are difficult to be directly treated by an oxidant or microorganisms, the activity of the microorganisms can be reduced by toxic substances in the printing and dyeing wastewater, so that the biochemical method is difficult to continuously operate, and in the oxidation process, the toxic substances are difficult to treat due to the multiple types of the organic matters in the printing and dyeing wastewater.
How to reduce the toxicity in the printing and dyeing wastewater treatment process and reduce the usage amount of the reducing agent becomes an important direction of the current research.
Disclosure of Invention
The invention aims to provide a process for treating azo printing and dyeing wastewater.
In order to solve the technical problem, the invention discloses an azo printing and dyeing wastewater treatment process, which comprises the following steps:
(1) carrying out biological adsorption treatment;
(2) wall breaking treatment, namely conveying the sludge discharged from the biological adsorption tank to a wall breaking treatment process, and performing wall breaking treatment on the sludge;
(3) anaerobic acidification, wherein the sludge subjected to wall breaking treatment is conveyed to an anaerobic acidification process for acidification;
(4) carrying out reduction treatment, wherein supernatant in the anaerobic acidification process is conveyed to a reduction treatment process, and the reduction treatment process is to add zero-valent iron into the supernatant;
(5) and (3) membrane filtration treatment, wherein the supernatant subjected to reduction treatment is conveyed to a membrane filtration treatment process, the membrane filtration treatment process sequentially comprises a microfiltration process and an ultrafiltration process, water produced by the microfiltration process is subjected to ultrafiltration treatment, and an ultrafiltration concentrated solution is conveyed to a biochemical process for treatment.
Further, the sludge produced by the anaerobic acidification treatment and the reduction treatment is mixed and then is conveyed to a dehydration process for dehydration treatment;
further, the mud cake produced by the dehydration process is conveyed to a reduction smoldering process, reducing gas or inert gas is introduced into the smoldering process, and a reducing agent is added at the same time, wherein the reducing agent is coal powder and/or carbon powder;
further, the mass ratio of the reducing agent to the dry weight of the mud cake is 1: 9-15;
further, conveying the carbon residue part generated by the smoldering process to the biological adsorption tank treatment process;
further, the dry weight ratio of the carbon residue to the sludge in the biological adsorption treatment process is 1: 1-3;
further, the biochemical process is an anaerobic process and/or an aerobic process, and excess sludge produced by the anaerobic process and/or the aerobic process is conveyed to the biological adsorption process;
further, the method also comprises a micro-electrolysis process, wherein the clear liquid in the biological adsorption treatment process is conveyed to the micro-electrolysis process, and the effluent of the micro-electrolysis process is conveyed to a dehydration process for dehydration;
further, the effluent of the dehydration process is conveyed to a microfiltration process;
further, the concentrated solution of the ultrafiltration process is subjected to oxidation process treatment before entering the biochemical process, wherein the oxidation process treatment is Fenton treatment;
the azo printing and dyeing wastewater treatment process has the following advantages:
1. the printing and dyeing wastewater containing azo dyes is subjected to biological adsorption treatment, and more than 70% of the azo dyes are adsorbed on the surfaces of zoogles due to the huge specific surface area of microorganisms, so that substances with biological toxicity in the wastewater are greatly reduced, and the toxic action of subsequent biochemical treatment is reduced;
2. carrying out ultrasonic wall breaking treatment on the sludge adsorbed with dye pollutants, fully mixing toxic and harmful dyes with slurry obtained after the microorganisms are crushed, conveying the mixture to an anaerobic acidification process for treatment, conveying supernate of an anaerobic acidification pool to a reduction treatment process for reduction treatment when the pH value is reduced to 4.5-6.3, reducing azo dyes by zero-valent iron under an acidic anaerobic condition, breaking azo bonds and reducing the chroma;
3. conveying effluent of a biological adsorption treatment process to a micro-electrolysis process for treatment, treating pollutants which are not adsorbed in the biological adsorption treatment process, directly conveying the effluent of the micro-electrolysis process to a dehydration process, wherein iron ions exist in the effluent, so that the dehydrated sludge can undergo a reduction reaction in a reduction smoldering process, elemental iron can be generated in generated carbon slag, the carbon slag can be conveyed to the biological adsorption treatment process to realize an iron-carbon reduction reaction, a zoogloea part in the biological adsorption treatment can be broken, and the surface area of suspended sludge is further increased;
4. the micro-filtration process and the ultrafiltration process are arranged, the ultrafiltration process can separate macromolecular pollutants from heavy metal ions, and then the effluent containing heavy metals is subjected to electric treatment, so that the heavy metals are prevented from influencing the sludge activity of the anaerobic process and the aerobic process.
Drawings
FIG. 1 is a schematic view of a process for treating azo-based printing and dyeing wastewater;
FIG. 2 is a schematic view of a process for treating azo-based printing and dyeing wastewater;
FIG. 3 is a schematic view of a process for treating azo-based printing and dyeing wastewater.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," when used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1
Taking certain printing and dyeing wastewater, pH9.3, chroma 970, CODcr1400mg/L, methyl orange 9.16X 10-5mol/L；
(1) And (3) biological adsorption treatment: the sludge load is 6kgBOD5/(kgMLSS. d), sludge concentration 3000 mg. L-1The hydraulic retention time is 0.5 h;
(2) breaking cell wall
Conveying the sludge discharged from the biological adsorption tank to a wall breaking treatment process, performing wall breaking treatment on the sludge, and performing ultrasonic treatmentThe frequency is 20kHz and is 1.65W/cm2At an acoustic energy density of (3) for 10 minutes;
(3) anaerobic acidification
Conveying the sludge subjected to wall breaking treatment to an anaerobic acidification process for acidification treatment, controlling the pH value of the sludge to be between 4.5 and 5, and maintaining the reaction condition for reaction for 1 hour;
(4) reduction treatment
Conveying the supernatant of the anaerobic acidification process and the effluent of the biological adsorption treatment process to a reduction treatment process, wherein the reduction treatment process comprises the steps of adding zero-valent iron into the supernatant, wherein the adding amount is 0.15g/L, and reacting for 0.5 h;
(5) membrane filtration process
Conveying the reduced supernatant to a membrane filtration treatment process, wherein the membrane filtration treatment process sequentially comprises a microfiltration process and an ultrafiltration process, water produced by the microfiltration process is subjected to ultrafiltration treatment, and an ultrafiltration concentrated solution is conveyed to a biochemical process for treatment;
and (3) effluent quality: pH7.3, chroma 41, CODcr75 mg/L, methyl orange was not detected.
Example 2
On the basis of the embodiment 1, the effluent of the biological adsorption treatment is conveyed to a micro-electrolysis process, and the effluent of the micro-electrolysis process is conveyed to a dehydration process for dehydration treatment.
And (3) effluent quality: pH7.1, chroma 29, CODcr53 mg/L, methyl orange was not detected.
Example 3
On the basis of the embodiment 2, the concentrated solution of the ultrafiltration process is subjected to oxidation treatment before entering a biochemical process, wherein the oxidation treatment is a Fenton oxidation process.
And (3) effluent quality: pH7.1, chroma 18, CODcr35 mg/L, methyl orange was not detected.
Example 4
Taking certain printing and dyeing wastewater, pH9.3, CODcr690mg/L, 30 mg.L-1Azo dye reactive brilliant red X-3B;
the wastewater was treated by the procedures of examples 1, 2 and 3;
the effluent quality is 1: pH7.4, CODcr51 mg/L, and no reactive brilliant red X-3B was detected.
And (3) effluent quality 2: pH7.1, CODcr39 mg/L, and no reactive brilliant red X-3B was detected.
The effluent quality is 3: pH7.1, CODcr21 mg/L, and no reactive brilliant red X-3B was detected.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (6)
1. The azo printing and dyeing wastewater treatment process is characterized by comprising the following steps:
(1) carrying out biological adsorption treatment;
(2) breaking cell wall; conveying the sludge discharged from the biological adsorption tank to a wall breaking treatment process, and performing wall breaking treatment on the sludge;
(3) anaerobic acidification, wherein the sludge subjected to wall breaking treatment is conveyed to an anaerobic acidification process for acidification;
(4) carrying out reduction treatment, wherein supernatant in the anaerobic acidification process is conveyed to a reduction treatment process, and the reduction treatment process is to add zero-valent iron into the supernatant; and
(5) performing membrane filtration treatment, namely conveying the reduced supernatant to a membrane filtration treatment process, wherein the membrane filtration treatment process sequentially comprises a microfiltration process and an ultrafiltration process, water produced by the microfiltration process is subjected to ultrafiltration treatment, and an ultrafiltration concentrated solution is conveyed to a biochemical process for treatment;
and mixing the sludge produced by the anaerobic acidification treatment and the reduction treatment, and then conveying the mixture to a dehydration process for dehydration treatment, conveying the mud cake produced by the dehydration process to a reduction smoldering process, introducing reducing gas or inert gas into the smoldering process, simultaneously adding a reducing agent, wherein the reducing agent is coal powder and/or carbon powder, the mass ratio of the reducing agent to the dry weight of the mud cake is 1:9-15, and conveying the carbon slag produced by the smoldering process to the biological adsorption tank treatment process.
2. The azo-based printing and dyeing wastewater treatment process according to claim 1, wherein the dry weight ratio of the carbon residue to the sludge in the biosorption treatment process is 1: 1-3.
3. The azo-based printing and dyeing wastewater treatment process according to claim 1, wherein the biochemical process is an anaerobic process and/or an aerobic process, and excess sludge produced by the anaerobic process and/or the aerobic process is delivered to the bioadsorption process.
4. The azo-based printing and dyeing wastewater treatment process according to claim 1, further comprising a microelectrolysis process, wherein the clear liquid in the bioadsorption treatment process is conveyed to the microelectrolysis process, and the effluent of the microelectrolysis process is conveyed to a dehydration process for dehydration.
5. The azo-based printing and dyeing wastewater treatment process according to claim 2, wherein the effluent of the dehydration process is sent to a microfiltration process.
6. The azo-based printing and dyeing wastewater treatment process according to claim 1, wherein the ultrafiltration process concentrate is subjected to an oxidation process before entering the biochemical process, and the oxidation process is Fenton treatment.
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| CN111362521A (en) * | 2020-04-10 | 2020-07-03 | 浙江龙奇印染有限公司 | Efficient printing and dyeing wastewater treatment process |
| CN112209589A (en) * | 2020-10-07 | 2021-01-12 | 中国科学院水生生物研究所 | Method for improving methane production capacity of anaerobic digestion of algae sludge by utilizing ultrasonic wave and zero-valent iron synergistic pretreatment |
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