CN103787543A - Method for pretreating acrylonitrile waste water by freezing method - Google Patents
Method for pretreating acrylonitrile waste water by freezing method Download PDFInfo
- Publication number
- CN103787543A CN103787543A CN201210418091.1A CN201210418091A CN103787543A CN 103787543 A CN103787543 A CN 103787543A CN 201210418091 A CN201210418091 A CN 201210418091A CN 103787543 A CN103787543 A CN 103787543A
- Authority
- CN
- China
- Prior art keywords
- waste water
- freezing
- wastewater
- treatment
- cod
- 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.)
- Pending
Links
Images
Landscapes
- Physical Water Treatments (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to a method for pretreating acrylonitrile waste water by a freezing method, Which comprises the following steps: placing an acrylonitrile waste water sample in a refrigeration container, placing the container in a refrigerator for refrigerating at the temperature of -7--25 DEG C for 10-30 hours, forming a two-phase solution of ice crystal at an upper layer and a concentrate at a lower layer; thawing the ice crystal and measuring the concentration content of acrylonitrile, COD and ammonia nitrogen, then discharging; introducing the concentrate at the lower layer to the refrigeration container for repeatedly refining, and then recovering and using acrylonitrile. According to the invention, the freezing method is used for concentrating the chemical waste water, the concentration content of acrylonitrile, COD, and ammonia nitrogen in waste water can be effectively reduced, the concentrated chemical waste water can be directly returned to the apparatus for recovering and using; the freezing method has little selectivity to the waste water, and is especially suitable for processing chemical waste water, the processing method has the advantages of simple operation and low cost, and the method can be finished in an universal device, and has good industrial application and prospect.
Description
Technical field
The invention belongs to the technical field of chemical production wastewater processing, particularly a kind of method with cold method Pretreatment for AN Wastewater.
Background technology
Conventional water technology has Physical, chemical method, biological process.Physical is by physical action, reclaims the treatment process that is the pollutent of suspended state in waste water.Separate, remove the waste water treatment process that is the pollutent of dissolving, colloidal state in waste water or is translated into innoxious substance with effect of mass transmitting by chemical reaction.In method of chemical treatment, produce chemical reaction and as basic processing unit be to add medicament: coagulation, neutralization, redox etc.; Have take effect of mass transmitting as basic processing unit: extraction, stripping, stripping, absorption, ion-exchange and electrodialysis and reverse osmosis etc.Latter two processing unit is collectively referred to as again membrane separation technique.Wherein use the processing unit of effect of mass transmitting both to there is chemical action, have again associated physical action, so also can branch away, become another kind for the treatment of process from method of chemical treatment, be called physico-chemical processes.Above-mentioned technical characterstic is: in waste water, have the organism of heavy metal contaminants, complicated component, be difficult to applicable this method of using of waste water of removing with common biological treatment.
Biological process is the metabolism by microorganism, makes to be in waste water the organic pollutant of solution, colloid and fine suspended state, is converted into the waste water treatment process of stable, harmless material.According to the difference of effect microorganism, biological treatment can be divided into again aerobiont to be processed and two types of anaerobic biological treatment.Biological wastewater treatment is widely used is aerobiont facture, and by tradition, aerobiont facture is divided into again activated sludge process and biomembrance process two classes.Activated sludge process itself is exactly a kind of processing unit, and it has multiple operation scheme.The treatment facility that belongs to biomembrance process has biological fluidized bed that biological filter, blodisc, biological contact oxidation pond and latest developments get up etc.Bio-oxidation pond method claims again natural biology facture.Anaerobic biotreatment method, has another name called biological reducing facture, mainly for the treatment of high concentrated organic wastewater and mud.The treatment facility using is mainly digester.The feature of this technology is: utilize nature to deposit raw various bacterial micro-organisms, organic substance decomposing in waste water is changed into innoxious substance, waste water is purified.
Hence one can see that, in existing wastewater processing technology, each own corresponding feature, for wastewater from chemical industry due to the complexity of component in waste water, certain single water treatment method is generally difficult to reach the requirement of effluent quality, conventionally need multiple sewage disposal place reasonable in technology combination to process, various water treatment method combine deeply treating wastewater.Up to now, there is not yet relevant report about the document with cold method Pretreatment for AN Wastewater and patent.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method with cold method Pretreatment for AN Wastewater, by cold method, wastewater from chemical industry is concentrated, not only can effectively reduce the content of vinyl cyanide in waste water, COD, ammonia nitrogen concentration, simultaneously concentrated wastewater from chemical industry directly return mechanism recycle; Compared with prior art, cold method does not almost have selectivity to the processing of dirty waste water, is particularly suitable for processing wastewater from chemical industry; Meanwhile, treatment process is easy and simple to handle, and cost is low, can in general-purpose equipment, complete, and economic benefit is good, has good industrial applications prospect.
A kind of method with cold method Pretreatment for AN Wastewater of the present invention, comprises following processing step:
(1) by acrylic nitrile waste water sample after oil removal, coagulation flotation are processed, be placed in freezing container, this container is put into refrigerator, freezing temp be-7 ℃ ~-25 ℃, freezing time is 10h～30h, the two phase liquid of formation upper strata ice crystal and lower floor's concentrated solution;
(2) ice crystal step (1) being obtained, melts, and measures the concentration content of its vinyl cyanide, COD, ammonia nitrogen, and according to the concentration content of vinyl cyanide, COD, ammonia nitrogen, by direct discharging of waste water after pre-treatment or enter sewage work and carry out secondary biochemical treatment;
(3) step (1) is obtained to lower floor's concentrated solution and enter in the freezing container that returns to step (1) and repeatedly refine 2 ~ 4 times, recycle vinyl cyanide.
Coagulation flotation in described step (1) is in acrylic nitrile waste water sample, to add respectively polymerization starter and coagulating agent, removes pollutant component;
Described polymerization starter is ammonium persulphate, Potassium Persulphate or sodium chlorate, and its consumption is the 0.005%-0.5% of acrylic nitrile waste water weight;
Described coagulating agent is the bodied ferric sulfate aqueous solution of concentration 12wt% or the polymerize aluminum chloride aqueous solution of concentration 10wt%, and its consumption is the 0.5%-1% of acrylic nitrile waste water weight;
The temperature of freezing in described step (1) is-15 ℃～-20 ℃;
Freezing time in described step (1) is 10h～16h;
The present invention is directed in wastewater from chemical industry, cause the not good defect of biological process treatment effect owing to thering is bio-toxicity, adopt cold method to carry out pre-treatment to wastewater from chemical industry, wastewater from chemical industry is concentrated.After finding that after deliberation cold method is to chemical wastewater treatment, in freezing and crystallizing, the content of acrylonitrile concentration is lower, and concentrated solution can directly be recycled through device.
The present invention's freezing container used is commercially available insulated tank, and waste water is put into the plastic tank that a bore and insulated tank internal diameter match, and plastic tank is suitable for reading is open ports, guarantees that awkward silence at a meeting carries out gradual freezing from top to bottom.
Beneficial effect
(1) the present invention concentrates wastewater from chemical industry by cold method, not only can effectively reduce the content of vinyl cyanide in waste water, COD, ammonia nitrogen concentration, simultaneously concentrated wastewater from chemical industry directly return mechanism recycle;
(2) compared with prior art, cold method does not almost have selectivity to the processing of dirty waste water, is particularly suitable for processing wastewater from chemical industry;
(3) treatment process of the present invention is easy and simple to handle, and cost is low, can in general-purpose equipment, complete, and economic benefit is good, has good industrial applications prospect.
Accompanying drawing explanation
Fig. 1 is cold method wastewater treatment process figure.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read the content of the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
Embodiment 1
The sewage of processing is acrylic nitrile waste water sample (the acrylonitrile installation biochemistry pool water inlet of oil of SPC the Ministry of Chemical Industry), through oil removal, coagulation flotation (ammonium persulphate consumption 0.1wt%(is with respect to acrylic nitrile waste water weight), 12wt% polymeric ferrous sulphate solution consumption 0.5wt%(is with respect to acrylic nitrile waste water weight)) to process, the water quality of water inlet is (not carrying out pre-treatment):
COD 1120～3880mg/L
Ammonia nitrogen 10.2～47.3mg/L
Vinyl cyanide 1.04～4.79mg/L
1) acrylic nitrile waste water sample is placed in to freezing container, this container is put into refrigerator, freezing temp is-7 ℃, and freezing time is 16h, forms the two phase liquid of upper strata ice crystal and lower floor's concentrated solution;
2) ice crystal step (1) being obtained, melts, and measures the change in concentration of its vinyl cyanide, COD, ammonia nitrogen, and according to the concentration content of vinyl cyanide, COD, ammonia nitrogen, by direct discharging of waste water after pre-treatment or enter sewage work and carry out secondary biochemical treatment;
3) step (1) is obtained lower floor's concentrated solution enter return freezing container repeat refine, carry out second-stage treatment, recycle vinyl cyanide.
Wastewater treatment interpretation of result refers to table 1.
Embodiment 2
The sewage of processing is acrylic nitrile waste water sample (the acrylonitrile installation biochemistry pool water inlet of oil of SPC the Ministry of Chemical Industry), through oil removal, coagulation flotation (Potassium Persulphate consumption 0.5wt%(is with respect to acrylic nitrile waste water weight), 10wt% polymerize aluminum chloride consumption 1wt%(is with respect to acrylic nitrile waste water weight)) to process, the water quality of water inlet is (not carrying out pre-treatment):
COD 1120～3880mg/L
Ammonia nitrogen 10.2～47.3mg/L
Vinyl cyanide 1.04～4.79mg/L
1) acrylic nitrile waste water sample is placed in to freezing container, this container is put into refrigerator, freezing temp is-15 ℃, and freezing time is 16h, forms the two phase liquid of upper strata ice crystal and lower floor's concentrated solution;
2) ice crystal step (1) being obtained, melts, and measures the change in concentration of its vinyl cyanide, COD, ammonia nitrogen, and according to the concentration content of vinyl cyanide, COD, ammonia nitrogen, by direct discharging of waste water after pre-treatment or enter sewage work and carry out secondary biochemical treatment;
3) step (1) is obtained lower floor's concentrated solution enter return freezing container repeat refine, carry out second-stage treatment, recycle vinyl cyanide.
Wastewater treatment interpretation of result refers to table 1.
Embodiment 3
The sewage of processing is acrylic nitrile waste water sample (the acrylonitrile installation biochemistry pool water inlet of oil of SPC the Ministry of Chemical Industry), through oil removal, coagulation flotation (ammonium persulphate consumption 0.1wt%(is with respect to acrylic nitrile waste water weight), 12wt% polymeric ferrous sulphate solution consumption 0.5wt%(is with respect to acrylic nitrile waste water weight)) to process, the water quality of water inlet is (not carrying out pre-treatment):
COD 1120～3880mg/L
Ammonia nitrogen 10.2～47.3mg/L
Vinyl cyanide 1.04～4.79mg/L
1) acrylic nitrile waste water sample is placed in to freezing container, this container is put into refrigerator, freezing temp is-10 ℃, and freezing time is 16h, forms the two phase liquid of upper strata ice crystal and lower floor's concentrated solution;
2) ice crystal step (1) being obtained, melts, and measures the change in concentration of its vinyl cyanide, COD, ammonia nitrogen, and according to the concentration content of vinyl cyanide, COD, ammonia nitrogen, by direct discharging of waste water after pre-treatment or enter sewage work and carry out secondary biochemical treatment;
3) step (1) is obtained lower floor's concentrated solution enter return freezing container repeat refine, carry out second-stage treatment, recycle vinyl cyanide
Wastewater treatment interpretation of result refers to table 1.
Embodiment 4
The sewage of processing is acrylic nitrile waste water sample (the acrylonitrile installation biochemistry pool water inlet of oil of SPC the Ministry of Chemical Industry), through oil removal, coagulation flotation (ammonium persulphate consumption 0.1wt%(is with respect to acrylic nitrile waste water weight), 12wt% polymeric ferrous sulphate solution consumption 0.5wt%(is with respect to acrylic nitrile waste water weight)) to process, the water quality of water inlet is (not carrying out pre-treatment):
COD 1120～3880mg/L
Ammonia nitrogen 10.2～47.3mg/L
Vinyl cyanide 1.04～4.79mg/L
1) acrylic nitrile waste water sample is placed in to freezing container, this container is put into refrigerator, freezing temp is-20 ℃, and freezing time is 10h, forms the two phase liquid of upper strata ice crystal and lower floor's concentrated solution;
2) ice crystal step (1) being obtained, melts, and measures the change in concentration of its vinyl cyanide, COD, ammonia nitrogen, and according to the concentration content of vinyl cyanide, COD, ammonia nitrogen, by direct discharging of waste water after pre-treatment or enter sewage work and carry out secondary biochemical treatment;
3) step (1) is obtained lower floor's concentrated solution enter return freezing container repeat refine, carry out second-stage treatment, recycle vinyl cyanide.
Wastewater treatment interpretation of result refers to table 1.
Embodiment 5
The sewage of processing is acrylic nitrile waste water sample (the acrylonitrile installation biochemistry pool water inlet of oil of SPC the Ministry of Chemical Industry), through oil removal, coagulation flotation (Potassium Persulphate consumption 0.5wt%(is with respect to acrylic nitrile waste water weight), 10wt% polymerize aluminum chloride consumption 1wt%(is with respect to acrylic nitrile waste water weight)) to process, the water quality of water inlet is (not carrying out pre-treatment):
COD 1120～3880mg/L
Ammonia nitrogen 10.2～47.3mg/L
Vinyl cyanide 1.04～4.79mg/L
1) acrylic nitrile waste water sample is placed in to freezing container, this container is put into refrigerator, freezing temp is-15 ℃, and freezing time is 16h, forms the two phase liquid of upper strata ice crystal and lower floor's concentrated solution;
2) ice crystal step (1) being obtained, melts, and measures the change in concentration of its vinyl cyanide, COD, ammonia nitrogen, and according to the concentration content of vinyl cyanide, COD, ammonia nitrogen, by direct discharging of waste water after pre-treatment or enter sewage work and carry out secondary biochemical treatment;
3) step (1) is obtained lower floor's concentrated solution enter return freezing container repeat refine, carry out second-stage treatment, recycle vinyl cyanide.
Wastewater treatment interpretation of result refers to table 1.
Embodiment 6
The sewage of processing is acrylic nitrile waste water sample (the acrylonitrile installation biochemistry pool water inlet of oil of SPC the Ministry of Chemical Industry), through oil removal, coagulation flotation (ammonium persulphate consumption 0.1wt%(is with respect to acrylic nitrile waste water weight), 12wt% polymeric ferrous sulphate solution consumption 0.5wt%(is with respect to acrylic nitrile waste water weight)) to process, the water quality of water inlet is (not carrying out pre-treatment):
COD 1120～3880mg/L
Ammonia nitrogen 10.2～47.3mg/L
Vinyl cyanide 1.04～4.79mg/L
1) acrylic nitrile waste water sample is placed in to freezing container, this container is put into refrigerator, freezing temp is-17 ℃, and freezing time is 20h, forms the two phase liquid of upper strata ice crystal and lower floor's concentrated solution;
2) ice crystal step (1) being obtained, melts, and measures the change in concentration of its vinyl cyanide, COD, ammonia nitrogen, and according to the concentration content of vinyl cyanide, COD, ammonia nitrogen, by direct discharging of waste water after pre-treatment or enter sewage work and carry out secondary biochemical treatment;
3) step (1) is obtained lower floor's concentrated solution enter return freezing container repeat refine, carry out second-stage treatment, recycle vinyl cyanide.
Wastewater treatment interpretation of result refers to table 1.
Table 1 wastewater treatment result
Continued 1
Although the present invention discloses preferred embodiment as above; so it is not in order to limit content of the present invention; anyly be familiar with this skill person; not departing from main spirits of the present invention and context; when doing various changes and retouching, therefore the protection domain of invention should be as the criterion with the basic right claimed range of applying for a patent.
Claims (8)
1. with a method for cold method Pretreatment for AN Wastewater, comprise following processing step:
(1) by acrylic nitrile waste water sample after oil removal, coagulation flotation are processed, be placed in freezing container, this container is put into refrigerator, freezing temp be-7 ℃ ~-25 ℃, freezing time is 10 ~ 30h, the two phase liquid of formation upper strata ice crystal and lower floor's concentrated solution;
(2) ice crystal step (1) being obtained, melts, and measures the concentration content of its vinyl cyanide, COD, ammonia nitrogen, and according to the concentration content of vinyl cyanide, COD, ammonia nitrogen, by direct discharging of waste water after pre-treatment or enter sewage work and carry out secondary biochemical treatment;
(3) step (1) is obtained to lower floor's concentrated solution and enter in the freezing container that returns to step (1) and repeatedly refine 2 ~ 4 times, recycle vinyl cyanide.
2. a kind of method with cold method Pretreatment for AN Wastewater according to claim 1, is characterized in that: the coagulation flotation in described step (1) is in acrylic nitrile waste water sample, to add respectively polymerization starter and coagulating agent, removes pollutant component.
3. a kind of method with cold method Pretreatment for AN Wastewater according to claim 2, is characterized in that: described polymerization starter is ammonium persulphate, Potassium Persulphate or sodium chlorate.
4. according to a kind of method with cold method Pretreatment for AN Wastewater described in claim 2 or 3, it is characterized in that: described polymerization starter consumption is the 0.005%-0.5% of acrylic nitrile waste water weight.
5. a kind of method with cold method Pretreatment for AN Wastewater according to claim 2, is characterized in that: described coagulating agent is the bodied ferric sulfate aqueous solution of concentration 12wt% or the polymerize aluminum chloride aqueous solution of concentration 10wt%.
6. according to a kind of method with cold method Pretreatment for AN Wastewater described in claim 2 or 5, it is characterized in that: described dosage of PAC is the 0.5%-1% of acrylic nitrile waste water weight.
7. a kind of method with cold method Pretreatment for AN Wastewater according to claim 1, is characterized in that: the temperature of freezing in described step (1) is-15 ℃～-20 ℃.
8. a kind of method with cold method Pretreatment for AN Wastewater according to claim 1, is characterized in that: the freezing time in described step (1) is 10h～16h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210418091.1A CN103787543A (en) | 2012-10-26 | 2012-10-26 | Method for pretreating acrylonitrile waste water by freezing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210418091.1A CN103787543A (en) | 2012-10-26 | 2012-10-26 | Method for pretreating acrylonitrile waste water by freezing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103787543A true CN103787543A (en) | 2014-05-14 |
Family
ID=50663668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210418091.1A Pending CN103787543A (en) | 2012-10-26 | 2012-10-26 | Method for pretreating acrylonitrile waste water by freezing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103787543A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110357321A (en) * | 2018-04-10 | 2019-10-22 | 华东理工大学 | A method of extracting sylvite from waste water |
| CN115259316A (en) * | 2022-08-05 | 2022-11-01 | 广东邦普循环科技有限公司 | Wastewater treatment method |
| CN115862917A (en) * | 2022-12-02 | 2023-03-28 | 中国原子能科学研究院 | Method and system for treating radioactive waste liquid |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6436296B1 (en) * | 1995-10-11 | 2002-08-20 | Jeffrey A. White | Waste water treatment method and apparatus |
| CN101066819A (en) * | 2007-06-13 | 2007-11-07 | 天津城市建设学院 | Combined treatment process for non-biodegradable organic industrial effluent with high salt content |
| CN101209872A (en) * | 2006-12-27 | 2008-07-02 | 上海久安水质稳定剂厂 | Coagulant special for steelworks or power plant coking wastewater |
| CN101544436A (en) * | 2009-05-08 | 2009-09-30 | 清华大学 | Method for removing and recovering sulfate in acrylonitrile wastewater by utilizing freezing crystallization |
| CN101885569A (en) * | 2010-08-06 | 2010-11-17 | 中环（中国）工程有限公司 | Process for treating high-salinity organic wastewater |
| CN101891269A (en) * | 2010-08-06 | 2010-11-24 | 中环（中国）工程有限公司 | Desalination method of waste water |
-
2012
- 2012-10-26 CN CN201210418091.1A patent/CN103787543A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6436296B1 (en) * | 1995-10-11 | 2002-08-20 | Jeffrey A. White | Waste water treatment method and apparatus |
| CN101209872A (en) * | 2006-12-27 | 2008-07-02 | 上海久安水质稳定剂厂 | Coagulant special for steelworks or power plant coking wastewater |
| CN101066819A (en) * | 2007-06-13 | 2007-11-07 | 天津城市建设学院 | Combined treatment process for non-biodegradable organic industrial effluent with high salt content |
| CN101544436A (en) * | 2009-05-08 | 2009-09-30 | 清华大学 | Method for removing and recovering sulfate in acrylonitrile wastewater by utilizing freezing crystallization |
| CN101885569A (en) * | 2010-08-06 | 2010-11-17 | 中环（中国）工程有限公司 | Process for treating high-salinity organic wastewater |
| CN101891269A (en) * | 2010-08-06 | 2010-11-24 | 中环（中国）工程有限公司 | Desalination method of waste water |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110357321A (en) * | 2018-04-10 | 2019-10-22 | 华东理工大学 | A method of extracting sylvite from waste water |
| CN115259316A (en) * | 2022-08-05 | 2022-11-01 | 广东邦普循环科技有限公司 | Wastewater treatment method |
| CN115259316B (en) * | 2022-08-05 | 2023-12-12 | 广东邦普循环科技有限公司 | Treatment method of wastewater |
| WO2024026982A1 (en) * | 2022-08-05 | 2024-02-08 | 广东邦普循环科技有限公司 | Treatment method for wastewater |
| CN115862917A (en) * | 2022-12-02 | 2023-03-28 | 中国原子能科学研究院 | Method and system for treating radioactive waste liquid |
| CN115862917B (en) * | 2022-12-02 | 2024-05-14 | 中国原子能科学研究院 | Method and system for treating radioactive waste liquid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Melak et al. | Application of freeze desalination for chromium (VI) removal from water | |
| CN102952764B (en) | Culture method of salt-tolerant anaerobic ammonium oxidation bacteria | |
| CN110526517A (en) | A kind of medical intermediate production waste water treatment process | |
| CN102992548B (en) | Method for treating low-temperature slaughter wastewater | |
| CN104150722A (en) | Treatment process for acrylic fiber waste water | |
| CN102153230B (en) | Method and device for treating salt-containing wastewater produced during producing epoxy chloropropane by using glycerol as raw material | |
| CN102260006A (en) | Method for treating heavy-metal-containing wastewater membrane filtration concentrated liquid | |
| CN104163516A (en) | Method for recycling stainless steel cold-rolling waste water | |
| CN103508637A (en) | Traditional Chinese medicine wastewater treatment system and method for treating traditional Chinese medicine wastewater | |
| CN105540993A (en) | High-ammonia nitrogen wastewater treatment technology | |
| CN107381892A (en) | A kind of handling process of high-concentration ammonia nitrogenous wastewater | |
| CN103787543A (en) | Method for pretreating acrylonitrile waste water by freezing method | |
| CN100337906C (en) | High-pollution low-concentration waste acid recycling method | |
| CN102344225B (en) | Processing method of salty wastewater in cellulose ether production | |
| CN107117760A (en) | A kind of method for removing organic matter in automobile industry water soluble dyestuffs coating waste-water | |
| TW200503966A (en) | Sludge-free wastewater treatment process & and apparatus | |
| CN103896457A (en) | Fine chemical wastewater treatment process | |
| JP7226731B2 (en) | Processing method of the object to be processed | |
| CN104926048A (en) | Treatment method for waste water in coal chemical industry | |
| CN104724881A (en) | Treatment method for high salinity industrial wastewater | |
| CN203530057U (en) | Wastewater pretreatment device in production of chemical synthesis raw material medicines | |
| CN104261594A (en) | Method for treating medium-low concentration ammonia-nitrogen wastewater simply and effectively | |
| CN114656072A (en) | Method for separating organic matters and salt in high-salt-content industrial wastewater containing organic matters | |
| CN102515417A (en) | Technology for treating scouring sewage and sludge | |
| CN102616997A (en) | Method for treating wastewater generated in production process of iron oxide pigment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140514 |