CN102070240B - Biomembrane treatment method of two-step wet-spun acrylic fiber wastewater - Google Patents
Biomembrane treatment method of two-step wet-spun acrylic fiber wastewater Download PDFInfo
- Publication number
- CN102070240B CN102070240B CN2009102232996A CN200910223299A CN102070240B CN 102070240 B CN102070240 B CN 102070240B CN 2009102232996 A CN2009102232996 A CN 2009102232996A CN 200910223299 A CN200910223299 A CN 200910223299A CN 102070240 B CN102070240 B CN 102070240B
- Authority
- CN
- China
- Prior art keywords
- acrylic fiber
- step wet
- filler
- wet spinning
- processing methods
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a biomembrane treatment method of two-step wet-spun acrylic fiber wastewater. In the method, anaerobic reaction and aerobic reaction are adopted. Being treated by the method, the DMAC two-step wet-spun acrylic fiber wastewater, originally having the following technical indexes: 500-1,000mg/L of COD (chemical oxygen demand), 75-100mg/L of NH4-N, 50-100mg/L of DMAC (dimethyl acetamide), 0-120mg/L of acrylonitrile and pH of 6.0-9, have the following technical indexes: not more than 250mg/L of COD, not more than 4mg/L of NH4-N, not more than 2mg/L of DMAC, not more than 2.0mg/L of acrylonitrile and pH of 6.0-9. The method provided by the invention has the following advantages: the excess sludge is less, the process flow is short, and the method is suitable for treating the mixed wastewater in the two-step wet spinning production taking DMAC as a solvent as well as for treating the wastewater in spinning production adopting other solvents, the wastewater containing acrylonitrile and partial printing and dyeing, spinning and petrochemical wastewater.
Description
Technical field
The present invention relates to a kind of treatment process of chemical fiber waste water, specifically relate to the treatment process of composite waste in a kind of acrylic fiber production process.
Background technology
China acrylic fiber production process enterprise has 16 families; Add up to 83.11 ten thousand tons/year of throughput; 12 families of operation at present; 80.1 ten thousand tons/year of overall throughputs; Four kinds of technologies of main employing: 1.0 ten thousand tons/year of Sodium Thiocyanate 99 (NaSCN) solvent single stage method wet spinnings (Shandong, Zibo Xue Yin company), 32.1 ten thousand tons/year of Sodium Thiocyanate 99 (NaSCN) solvent two step method wet spinnings (acrylic fibers division department of Oil of Shanghai Petrochemical Company company, Daqing petrochemical company Acrylic Fibers Plant, Anqing Petrochemical branch office Acrylic Fibers Plant, Daqing Refinery company Acrylic Fibers Plant), N; 22.8 ten thousand tons/year of N N (DMF) solvent two step method dry-spinning (Fushun Acrylic Fibers Plant, Qilu Petrochemical Acrylic Fibers Plant, the special acrylic fibers of Qinhuangdao Aurion ltd, Zhejiang Jinyong Nitrilon Co., Ltd.), N; 24.2 ten thousand tons/year of N N,N-DIMETHYLACETAMIDE (DMAC) solvent two step method wet spinnings (Jilin grotesque peak chemical fibre ltd, Hangzhou Wan acrylic fibers ltd, Ningbo Mitsubishi beautiful positive chemical fibre ltd), solvent has nothing in common with each other, and raw material is to be main with acrylonitrile monemer.By 19.8 tons of ton product effluents (domestic certain enterprise's measured value), 1586.00 ten thousand tons of annual efflux wastewater total amounts.Waste water is divided three classes: factory effluent, ground wash-down water and sewage, pollution substance comes from raw material, additive, solvent and raw material and product etc. in the waste water.Sneak into strong acid (sulfuric acid), pH value low (pH=2.5-4) in the waste water, contain poisonous organism, hardly degraded organic substance etc., have vinyl cyanide, vinyl acetate between to for plastic, sodium sulfite anhy 96, ammonium persulphate, ferrous sulfate, sulfuric acid, YD 30 (EDTA), acetic acid, n n dimetylaniline, DMAC and partial polymer (low, high polymers) etc. like DMAC two step method wet spinning production line institute waste discharge pollutant in water.If these waste water directly discharging influence receiving water body water quality with serious harm, the harm Biosafety.It is pre-treatment+anaerobism+aerobic that treatment process that Nitrilon waste water treatment plant adopts is adopted by overwhelming majority enterprises; Water outlet COD is generally 200-400mg/L; Can not reach direct emission standards; Enterprise effluxes after generally chemical fibre composite waste treatment plant and other waste water combination treatment being sneaked in this water outlet; This causes wastewater treatment process to have following problems: the toxic organic compound that contains in (1), the Nitrilon waste water influences the biological treatment system operation, and some toxic organic compound " penetrates " Waste Water Treatment and gets into receiving water body, influences receiving water body water quality; (2), sulfate radical is too high in the waste water, influences the biological treatment system working efficiency, sulfate radical is not up to standard yet in the water outlet; (3), hardly degraded organic substance (like part of auxiliary) increased the difficulty of Waste Water Treatment, the water outlet COD of Nitrilon waste water treatment plant does not reach national emission request; (4), need in the wastewater treatment process to add the multiple nutrients material, must handle excess sludge, increased cost for wastewater treatment.Simultaneously, the Nitrilon waste water treatment system is built in the nineties more, is difficult to satisfy the Environmental Protection in China requirement.
For many years; Chinese scholar is carried out many researchs to the Nitrilon waste water biological treatment; Obtained some achievements, mainly contained: the bioremediation (99112488.X of comprehensive effluent disposal technology for wet spinning acrylic fibers industry (97107031.8,1998 years open), Nitrilon waste water; Calendar year 2001 is open), vinyl cyanide, Nitrilon waste water treatment process (01115864.6; 2002 are open), the treatment process (00129461.X, 2002 open) of acrylic fibers waste water by dry process, the treatment process (02135650.5,2003 year open) of acrylic fibers waste water by dry process, dry method Sodium Thiocyanate 99 be solvent two-step method acrylic fibre wet spinning processing method of industrial waste water (03116574.5; 2004 are open), a kind of acrylon production waste water treatment method (200710176576.3,2009 years open).All these achievements in research do not relate to the handling problem that DMAC is two step wet-spinning factory effluents of solvent; Technological core is the active sludge biological facture, needs a large amount of excess sludge of discharging regularly, and the secondary treatment cost is big; Technical process is long, complicated operation, management inconvenience.
Summary of the invention
The objective of the invention is to propose a kind of two step wet spinning acrylic fiber wastewater biological membrane processing methods, surplus sludge volume is significantly less than activated sludge process, reduces the excess sludge treatment operating costs; Except being applicable to that DMAC is the two step wet-spinning production wastewater treatment of solvent, also is applicable to other solvent spinning factory effluents, contains vinyl cyanide material waste water and part printing and dyeing, weaving and petrochemical wastewater.
For achieving the above object, the present invention adopts following technical scheme:
Developed a kind of microbial film treatment process that can handle two step wet spinning acrylic fiber waste water, the filler ratio of adding is 30.0%-70.0% in the reactor drum, and surplus sludge volume is lower than activated sludge process;
Above-mentioned two step wet spinning acrylic fiber wastewater biological waste water that membrane processing method is handled comprise the composite waste of factory effluent such as acrylic fiber polymerization factory effluent, spinning factory effluent, solvent recuperation waste water, ground wash-down water and sewage and various waste water,
The filler that adds in the biofilm reactor in the above-mentioned two step wet spinning acrylic fiber wastewater biological membrane processing methods is the also fixed filler of floating filler both.
Biofilm reactor is by anoxic, aerobic reaction operation in the two above-mentioned step wet spinning acrylic fiber wastewater biological membrane processing methods, and the order of two kinds of reactions can replace on request, and operating parameter is respectively:
A. hypoxia response:
pH 6.5～9，
Hydraulic detention time 0.0h～3h,
Dissolved oxygen 0.2～0.5mg/L,
Sludge concentration 5～20g/L;
B. aerobic reaction:
pH 6.5～9，
Hydraulic detention time 2.5h～8h,
Dissolved oxygen 2.0～5.0mg/L,
Sludge concentration 5～20g/L;
During above-mentioned two steps wet spinning acrylic fiber wastewater biological membrane processing method operations, anoxic, aerobic two kinds of reactions both can be realized by the time sequence by a reactor drum, also can be realized by spatial sequence by two reactor drums or a reactor drum two sections.
The influent quality of above-mentioned two step wet spinning acrylic fiber wastewater biological membrane processing methods should reach following technical indicator:
COD 500～1000mg/L BOD 250～500mg/L
TOC 180～300mg/L TN 180～250mg/L
NH
4-N 75～100mg/L DMAC 50～100mg/L
Vinyl cyanide 0～120mg/L pH 6.0～9
The effluent quality of two above-mentioned step wet spinning acrylic fiber wastewater biological membrane processing methods can reach following technical indicator:
COD≤ 250mg/L BOD≤ 10mg/L
TOC≤ 80mg/L TN≤ 50mg/L
NH
4-N≤ 4mg/L DMAC≤ 2mg/L
Vinyl cyanide≤2.0mg/L pH=6.0～9
Two above-mentioned step wet spinning acrylic fiber wastewater biological membrane processing methods add inorganic carbon in the reactor drum operational process in water inlet, adding concentration is 0.05-3.00mg/L.
Two above-mentioned step wet spinning acrylic fiber wastewater biological membrane processing methods, its nutritive substance dosage is COD: N: P=200: 10: 1.
Two above-mentioned step wet spinning acrylic fiber wastewater biological membrane processing methods, its filler of selecting for use has soft-filler, semi soft packing, elastic filler, Ball-type packing, urethane filler, fibrous packing or other biological filler.
Two above-mentioned step wet spinning acrylic fiber composite waste microbial film treatment processs also are applicable to acrylic fibers, vinyl cyanide, N, the biological treatment of N-acetic acid dimethylamide and chemical fibre manufacture waste water.
The present invention than the advantage that prior art has is:
1, the present invention can effectively handle DMAC two steps wet spinning acrylic fiber waste water, has filled up domestic blank;
2, adopt the microbial film treatment process that adds carrier, surplus sludge volume is few, has reduced the secondary treatment cost;
3, adopt hypoxia response+aerobic reaction, and add inorganic carbon source, effectively denitrogenation;
4, technical process of the present invention is short, can adopt a reactor drum also can adopt two reactor drums, and it is easy, easy and simple to handle to implement;
5, the effective poisonous or hardly degraded organic substance such as the vinyl cyanide in the degrading waste water, DMAC, EDTA of the present invention has reduced the harm of discharge of wastewater to environment;
6, the present invention adopts the microbial film facture, has effectively avoided sludge bulking in the Nitrilon waste water treating processes, has improved the stability of waste water treatment engineering operation;
Description of drawings
Fig. 1 is the concrete process flow sheets of two step wet spinning acrylic fiber wastewater biological membrane processing methods.
Fig. 2 be anoxic, aerobic reaction at a reactor drum by time sequence run-mode synoptic diagram.
Fig. 3 be anoxic, aerobic reaction at three reactor drums by spatial sequence run-mode synoptic diagram.
Embodiment
Below in conjunction with embodiment technical scheme of the present invention is detailed further, protection of the present invention is not limited to following embodiment.
Specific embodiment 1-anoxic, aerobic reaction are pressed time sequence operational mode at a reactor drum
Certain chemical fibre factory's acrylic fiber production process line yearly capacity is 100,000 tons, and the polymerized unit raw material is vinyl acetate, vinyl cyanide and de-salted water, and auxiliary material has ammonium persulphate, sulfuric acid, ferrous sulfate, sodium pyrosulfate etc.; Stoste is prepared by acetic acid and the synthetic DMAC of n n dimetylaniline immediately.Waste water is mainly derived from polymerized unit, and spinning unit, solvent recovery unit also produce part waste water.Waste water treatment plant's equalizing tank receives from all factory effluents and plant area's sanitary wastewaters such as polymerized unit, spinning unit, solvent recovery unit.This composite waste is handled by following method.
Composite waste is promoted among the present invention with pump after physico-chemical pretreatment reaches corresponding water quality requirement.Waste water is evenly distributed in the reactor drum by water distributor (6) after water-in (1) control gets into; Air gets into the back by inlet mouth (3) control and is discharged by aerator (5); The interior air water of reactor drum mixes and contacts with fixed type biological filler (8); Pollutants in waste water obtains removing the back clear water and is discharged by water outlet (7), and circulating water outlet (2) is started working waste water in the reactor drum is circulated when needed, and few part excess sludge is by regularly being discharged by evacuation port (4); Water inlet pH value remains between 6～9 with PLC (9) feedback control; Add sodium hydrogen carbonate solution in the water inlet, adding concentration is 0.5mg/L; Be 6h reaction time, wherein, and water inlet 0.5h, aeration 3h, ST 2h, water outlet time 0.5h; Temperature of reactor is controlled at 25 ℃ ± 1.5, DO=4.5 ± 0.5mg/L during aeration.Work synoptic diagram of the present invention such as Fig. 2, result such as table 1.
Table 1 embodiment 1 result
Unit: mg/L
| COD | BOD | TOC | TN | NH 4-N | DMAC | Vinyl cyanide | pH | |
| Water inlet | 600～1000 | 350～500 | 180～250 | 180～250 | 75～108 | 80～100 | 85～120 | 6～9 |
| Water outlet | 240 | 21 | 77 | 47 | 5 | 0 | 0 | 6～9 |
| Clearance % | 75 | 94 | 68 | 75.5 | 94 | 100 | 100 |
The reactor drum water outlet is according to the difference of various places emission standard; Multiple processing form is arranged: discharge after the next stage reactor for treatment is up to standard (1); (2) be disposed to composite waste treatment plant and further enter receiving water body after the processing; (3) enter the municipal sewage plant and further enter receiving water body after the processing, (4) are back to enterprise after advanced treatment.
Specific embodiment 2-anoxic, aerobic reaction are pressed the spatial sequence operational mode at three reactor drums
Certain chemical fibre factory's acrylic fiber production process line yearly capacity is 150,000 tons, and other situation are with embodiment 1.This composite waste is handled by following method.
Composite waste is promoted among the present invention with pump after physico-chemical pretreatment reaches corresponding water quality requirement.Waste water at first is evenly distributed in the anoxic reacter (1) by water distributor (5) after water-in (4) gets into; Waste water fully contacts the back with anoxic fixed type biological filler (6) and removes the part pollutent; Biodegradability is improved, and water outlet is evenly distributed in the aerobic reactor (2) by water distributor (7) from flowing in the aerobic reactor (2) in the anoxic reacter (1), and air gets into the back by inlet mouth (8) and evenly is released in the reactor drum by reliever (9); Fully contact with aerobe filler (10) behind the air water thorough mixing; Pollutent obtains removing in the waste water, and water outlet is discharged by water outlet (11) through the post precipitation supernatant from flowing in the separator for mud and water (3); When needing, the mixed solution in the aerobic reactor (2) can be circulated to anoxic reacter (1) by pump (13) through circulating water outlet (12).The water inlet pH value of water-in (4) remains between 6～9, and adds sodium hydrogen carbonate solution, and adding concentration is 0.5mg/L; Anoxic reacter (1) hydraulic detention time is 2h, and aerobic reactor (2) hydraulic detention time is 2.5h, and hydraulic detention time is 1h in the separator for mud and water (3); Three temperature of reactor are controlled at 25 ℃ ± 1.5; DO=4.5 ± 0.5mg/L in the aerobic reactor (2).Work synoptic diagram of the present invention such as Fig. 3, result such as table 2.
Table 2 embodiment 2 results
Unit: mg/L
| COD | BOD | TOC | TN | NH 4-N | DMAC | Vinyl cyanide | pH | |
| Water inlet | 610～1000 | 350～500 | 175～256 | 180～235 | 79～110 | 82～100 | 85～125 | 6～9 |
| Water outlet | 220 | 20 | 51 | 26 | 3 | 0 | 0 | 6～9 |
| Clearance % | 76 | 95 | 79 | 88 | 95 | 100 | 100 |
The reactor drum water outlet is according to the difference of various places emission standard; Multiple processing form is arranged: discharge after the next stage reactor for treatment is up to standard (1); (2) be disposed to composite waste treatment plant and further enter receiving water body after the processing; (3) enter the municipal sewage plant and further enter receiving water body after the processing, (4) are back to enterprise after advanced treatment.
Claims (9)
1. the microbial film treatment process that can handle two step wet spinning acrylic fiber waste water, surplus sludge volume is lower than activated sludge process, and the filler ratio of adding is 30.0%-70.0% in the reactor drum; Said microbial film treatment process influent quality should reach following technical indicator:
COD: 500～1000mg/L, biochemical oxygen demand: 250～500mg/L,
Total organic carbon: 180～300mg/L, total nitrogen: 180～250mg/L,
Ammonia nitrogen: 75～100mg/L, DMAC N,N: 50～100mg/L,
Vinyl cyanide: 0～120mg/L, pH:6.0～9,
Said microbial film treatment process used biological film reactor drum is by anoxic, aerobic reaction operation, and the order of two kinds of reactions replaces on request, and operating parameter is respectively:
A. hypoxia response:
pH 6.5～9，
Hydraulic detention time 0.0h～3h,
Dissolved oxygen 0.2～0.5mg/L,
Sludge concentration 5～20g/L;
B. aerobic reaction:
pH 6.5～9，
Hydraulic detention time 2.5h～8h,
Dissolved oxygen 2.0～5.0mg/L,
Sludge concentration 5～20g/L.
2. according to the described two step wet spinning acrylic fiber wastewater biological membrane processing methods of claim 1, it is characterized in that the waste water of handling comprises acrylic fiber polymerization factory effluent, spinning factory effluent, solvent recuperation waste water, ground wash-down water and sewage.
3. according to the described two step wet spinning acrylic fiber wastewater biological membrane processing methods of claim 1, it is characterized in that the filler that adds in the biofilm reactor is floating filler or fixed filler.
4. according to the described two step wet spinning acrylic fiber wastewater biological membrane processing methods of claim 1; It is characterized in that anoxic, aerobic two kinds of reactions are realized by the time sequence by a reactor drum or realized by spatial sequence or realized by spatial sequence by two sections an of reactor drum by two reactor drums.
5. according to the described two step wet spinning acrylic fiber wastewater biological membrane processing methods of claim 1, it is characterized in that effluent quality reaches following technical indicator:
COD≤250mg/L biochemical oxygen demand≤10mg/L,
Total organic carbon≤80mg/L total nitrogen≤50mg/L,
Ammonia nitrogen≤4mg/L DMAC N,N≤2mg/L,
Vinyl cyanide≤2.0mg/L pH=6.0～9.
6. according to the described two step wet spinning acrylic fiber wastewater biological membrane processing methods of claim 1, it is characterized in that in water inlet, add inorganic carbon in the reactor drum operational process, adding concentration is 0.05-3.00mg/L.
7. according to the described two step wet spinning acrylic fiber wastewater biological membrane processing methods of claim 1, it is characterized in that the nutritive substance dosage is COD: N: P=200: 10: 1.
8. according to the described two step wet spinning acrylic fiber wastewater biological membrane processing methods of claim 2, it is characterized in that the filler of being selected for use has soft-filler, semi soft packing, elastic filler, Ball-type packing, urethane filler, fibrous packing or other biological filler.
9. according to the described two step wet spinning acrylic fiber composite waste microbial film treatment processs of claim 1, it is characterized in that this method is applicable to acrylic fibers, vinyl cyanide, N, the biological treatment of N-acetic acid dimethylamide and chemical fibre manufacture waste water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102232996A CN102070240B (en) | 2009-11-23 | 2009-11-23 | Biomembrane treatment method of two-step wet-spun acrylic fiber wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102232996A CN102070240B (en) | 2009-11-23 | 2009-11-23 | Biomembrane treatment method of two-step wet-spun acrylic fiber wastewater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102070240A CN102070240A (en) | 2011-05-25 |
| CN102070240B true CN102070240B (en) | 2012-08-08 |
Family
ID=44029027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102232996A Expired - Fee Related CN102070240B (en) | 2009-11-23 | 2009-11-23 | Biomembrane treatment method of two-step wet-spun acrylic fiber wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102070240B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102557347B (en) * | 2012-01-06 | 2013-05-15 | 江苏蓝星环保科技有限公司 | Method for treating aramid waste water |
| CN103373758B (en) * | 2012-04-29 | 2014-12-31 | 中国石油化工股份有限公司 | Denitrifying method for ammonia-containing waste water discharged in acrylic production process |
| CN102674635B (en) * | 2012-05-29 | 2014-01-01 | 中国环境科学研究院 | Biochemical treatment method for acrylon wastewater |
| CN102718362A (en) * | 2012-06-20 | 2012-10-10 | 哈尔滨工程大学 | Biological treatment method for wastewater produced by acrylonitrile |
| CN103482816B (en) * | 2013-08-22 | 2014-12-10 | 苏州苏净环保工程有限公司 | Denitrification treatment method and treatment system for wastewater containing DMF (N,N-dimethylformamide) and DMAC (dimethyl acetylamide) |
| CN103951060B (en) * | 2014-04-11 | 2016-05-18 | 广东紫方环保技术有限公司 | A kind of O-phthalic amine Waste Water Treatment and control method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1385380A (en) * | 2001-05-11 | 2002-12-18 | 中国石油化工股份有限公司 | Method for treating acrylonitrile and acrylic waste water |
-
2009
- 2009-11-23 CN CN2009102232996A patent/CN102070240B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1385380A (en) * | 2001-05-11 | 2002-12-18 | 中国石油化工股份有限公司 | Method for treating acrylonitrile and acrylic waste water |
Non-Patent Citations (1)
| Title |
|---|
| 黄民生等.湿法腈纶生产的含腈废水处理实验研究.《工业水处理》.2002,第22卷(第5期),第15-18页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102070240A (en) | 2011-05-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102897979B (en) | Treatment method of coking waste water | |
| CN102070240B (en) | Biomembrane treatment method of two-step wet-spun acrylic fiber wastewater | |
| EP3730460B1 (en) | Method for upgrading and expanding sewage biological treatment process | |
| CN102583747B (en) | A kind of high ammonia nitrogen leather-making waste water biochemical denitrification treatment unit and technique | |
| CN110436630B (en) | Toxic and high-nitrogen-content chemical sewage coupling membrane biological treatment reactor | |
| CN1887740A (en) | Short-path deep biological denitrogenation method for city garbage percolate | |
| CN102040315A (en) | Method for treating high ammonia nitrogen wastewater by two-stage A/O process | |
| CN1651343A (en) | AZNdenitrification phosphorus oliminating sewage treatment method and device | |
| CN105461174A (en) | Method for removing high ammonia nitrogen from pig farm dry manure cleaning livestock wastewater | |
| CN100554195C (en) | A kind of waste water treatment process and purposes to high-ammonia nitrogen low C/N ratio | |
| CN212293218U (en) | Anaerobic ammonia oxidation landfill leachate treatment system | |
| CN111807610B (en) | Method and system for deeply removing total nitrogen in sewage | |
| CN113428979A (en) | Device and method for synchronously treating nitrate wastewater and domestic sewage by two-stage reinforced PDAMOX process based on biological membrane | |
| CN202688093U (en) | Improved A/O (anoxic/oxic) four-point section-water supply high-efficiency synchronous nitrogen and phosphorus removal device | |
| CN111099726A (en) | Synchronous denitrification and dephosphorization double-sludge sewage treatment system and treatment process thereof | |
| CN111196663A (en) | Biological treatment method and device for printing and dyeing wastewater | |
| CN110759604A (en) | Two-stage SBR (sequencing batch reactor) series efficient biological denitrification method for low-carbon-source sewage | |
| CN110776219A (en) | Advanced treatment device for printing and dyeing wastewater pollutants and application thereof | |
| CN114409082A (en) | High-ammonia-nitrogen and low-carbon-nitrogen-ratio sewage wastewater OAO coupling zero-valent iron nitrogen and phosphorus removal method | |
| CN105130092B (en) | Treatment device and method for degradation and nitrogen removal of printing and dyeing wastewater high-concentration organic matters | |
| CN111153551A (en) | Municipal sewage treatment device and treatment process | |
| CN113998848B (en) | Ammonia distillation, gas water seal, rainwater and sludge filtrate mixed wastewater treatment system and method | |
| CN107879473B (en) | Method for improving biological denitrification treatment efficiency of industrial wastewater | |
| CN216191392U (en) | Dephosphorization denitrification active sludge thickener for treating sewage with low carbon-nitrogen ratio and treatment device | |
| CN101830601A (en) | Biological treatment system and method thereof specific to industrial wastewater of fluorescent brightener |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120808 Termination date: 20171123 |