CN100509661C - Treating technique of polyether polyatomic alcohol producing sewage recovering and utilization - Google Patents
Treating technique of polyether polyatomic alcohol producing sewage recovering and utilization Download PDFInfo
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- CN100509661C CN100509661C CNB2004100939533A CN200410093953A CN100509661C CN 100509661 C CN100509661 C CN 100509661C CN B2004100939533 A CNB2004100939533 A CN B2004100939533A CN 200410093953 A CN200410093953 A CN 200410093953A CN 100509661 C CN100509661 C CN 100509661C
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- 239000010865 sewage Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 17
- 229920000570 polyether Polymers 0.000 title claims abstract description 13
- 239000004721 Polyphenylene oxide Substances 0.000 title claims abstract description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 title 1
- 238000004519 manufacturing process Methods 0.000 claims abstract description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000001301 oxygen Substances 0.000 claims abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 238000007254 oxidation reaction Methods 0.000 claims description 35
- 230000003647 oxidation Effects 0.000 claims description 20
- 230000001699 photocatalysis Effects 0.000 claims description 20
- 239000010802 sludge Substances 0.000 claims description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000001223 reverse osmosis Methods 0.000 claims description 13
- 238000000108 ultra-filtration Methods 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 6
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 5
- 238000005273 aeration Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000011941 photocatalyst Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 239000011782 vitamin Substances 0.000 claims description 3
- 229940088594 vitamin Drugs 0.000 claims description 3
- 229930003231 vitamin Natural products 0.000 claims description 3
- 235000013343 vitamin Nutrition 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000010941 cobalt Substances 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 239000011573 trace mineral Substances 0.000 claims description 2
- 235000013619 trace mineral Nutrition 0.000 claims description 2
- 229920005862 polyol Polymers 0.000 claims 3
- 150000003077 polyols Chemical class 0.000 claims 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims 2
- 238000004062 sedimentation Methods 0.000 claims 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims 1
- 239000013043 chemical agent Substances 0.000 claims 1
- 239000004519 grease Substances 0.000 claims 1
- 229910052742 iron Inorganic materials 0.000 claims 1
- 230000014759 maintenance of location Effects 0.000 claims 1
- 230000008719 thickening Effects 0.000 claims 1
- 239000004408 titanium dioxide Substances 0.000 claims 1
- 230000001590 oxidative effect Effects 0.000 abstract description 6
- 239000003814 drug Substances 0.000 abstract description 3
- 238000001914 filtration Methods 0.000 abstract description 2
- 239000003054 catalyst Substances 0.000 abstract 3
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 150000005846 sugar alcohols Polymers 0.000 abstract 1
- 238000007146 photocatalysis Methods 0.000 description 15
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 8
- 239000002699 waste material Substances 0.000 description 8
- 230000015556 catabolic process Effects 0.000 description 7
- 238000006731 degradation reaction Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 6
- 239000003921 oil Substances 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical group [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 2
- 238000005325 percolation Methods 0.000 description 2
- 150000003722 vitamin derivatives Chemical class 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 241001148470 aerobic bacillus Species 0.000 description 1
- 238000006065 biodegradation reaction Methods 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 235000010216 calcium carbonate Nutrition 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 230000000050 nutritive effect Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
A treating process for recovering and utilizing polyether poly-alcohol production sewage is carried out by producing sewage, entering regulating pool, regulating pool connection with oil separated pool, batching pool, anaerobic reactor, oxygen contacting oxidizing pool and settling pool, clear liquid of settling pool self-flowing into light catalyst oxidizing reactor, the mud and the mud of anaerobic reactor entering into mud concentrating pool, entering into dewaterer, light catalyst oxidizing reactor connection with continuous super-filtering treater and reversing-penetrating treater, adding medicament into batching pool by medicine added box, and supplying oxygen for oxygen contacting oxidizing pool and light catalyst oxidizing reactor by fan. Its advantages include low cost and consumption, to decrease occupied area.
Description
Technical field
The present invention relates to sewage disposal and regeneration, is a kind of technology of processing of polyether glycol production waste recycling specifically.
Background technology
Polyether glycol is mainly used in the production urethane foam, also as suds-stabilizing agent, paper industry defoamer, crude oil demulsifier, high-effective low foam washing composition, lubricant, quenching medium, emulsion foaming agent, multiple cutting agent, rubber lubricant and dedicated solvent etc., its purposes is very extensive.Because polyether glycol itself and most of raw materials for production thereof all are the organism of extremely difficult degradation, so the extremely difficult processing of the sewage that is produced in the production process.Many producers directly discharge, and give to be received environment and cause huge pollution.In addition, along with the worsening shortages of water resources, problem of water saving more and more obtains people's common concern, many enterprises begin to adopt reuse of wastewater in order to reduce cost, especially chemical industry, the water of productive use amount is big, and this just makes recycling sewage generated by making seem more urgent.Because polyether glycol production waste pollutent is difficult to handle, also do not see at present the treatment process of relevant polyether glycol production waste recycling and the report of method, just report after some producer adopts the method for dilution to reduce organic concentration and use traditional Wastewater Treated by Activated Sludge Process again.
The subject matter that this method exists is: cause treatment capacity to increase with sanitary sewage diluting high-concentration factory effluent, running expense improves, and economic benefit reduces.In addition, organism major part contained in the sewage is the organism of difficult degradation, utilizes aerobic biological treatment to be difficult to remove, and the clearance of pollutent is very low.Sewage after the processing is difficult to reach emission standard, causes very big pollution to environment.Can not recycle sewage, cause huge water resource waste.
Summary of the invention
In order effectively to remove the organism of difficult degradation in the polyethers sewage, reach the standard of recirculated cooling water supplementary feed, the present invention proposes following technical scheme:
What anaerobic treatment reactor 5 adopted is CGSB, and operating temperature is 30 ± 1 ℃.
Add in trace elements irons, cobalt, nickel, manganese, copper, zinc and the VITAMIN one or more by dosing tank 14, guarantee in the water outlet concentration at 0.01-0.1mg/l, and add continuously.。
The hydraulic detention time of anaerobic reactor 5 is 2 ~ 5 days.
By dosing tank 14 interpolation liquid caustic soda, sheet alkali composition all is the adjusting that NaOH carries out basicity, and the basicity that guarantees water outlet is at 1500-3000mg/l, and basicity is with CaCO
3Meter.
Photocatalysis oxidation reaction device 8, photocatalyst is a Nano titanium dioxide, above glass filler, utilizes ultraviolet lamp to shine simultaneously, the wavelength of ultraviolet lamp is chosen in the irradiation of the light of 270-300nm, and the oxygen that utilizes blower fan 15 to provide simultaneously carries out aeration.
Flow into equalizing tank after the sewage of high density comes out from the workshop, finish the adjusting of water quality and quantity herein, utilize the lifting of sump pump to enter oil trap, remove the oil slick in the sewage; Sewage gravity flow subsequently enters dosing chamber, finishes the lifting of temperature and adding of nutritive element at this, utilizes submersible pump to promote and enters the anaeration in normal temperature reactor, and the biogas that the anaerobic degradation organism produces is as energy utilization.Anaerobic reactor water outlet gravity flow enters the aerobic contact oxidation pond, further removes organism.The water outlet of aerobic contact oxidation pond is carried out mud-water separation at settling tank.Supernatant liquor after the separation enters the photocatalysis oxidation reaction device, the water outlet of photocatalysis oxidation reaction device enters the continuous ultrafiltration treater, water after the filtration passes through the reverse-osmosis treated device again, and the effluent quality index reaches recirculated cooling water supplementary feed water quality standard, can recycle.The excess sludge of settling tank and the excess sludge of anaerobic reactor together enter sludge thickener, concentrate laggard water trap.
Anaerobic reactor adopts expanded granular sludge bed anaerobic reactor (EGSB), and volumetric loading can reach 10 ~ 20kgCOD/m
3.d.
Description of drawings
Fig. 1 is a process flow sheet of the present invention
Wherein: 1. production waste 2. equalizing tanks 3. oil traps 4. dosing chambers 5. anaerobic reactors 6. aerobic contact oxidation ponds 7. settling tanks, 8. photocatalysis oxidation reaction devices, 9. continuous ultrafiltration treaters, 10. reverse-osmosis treated devices, 11. reuse waters, 12. sludge thickeners, 13. water traps, 14. dosing tanks 15. blower fans 16. collecting methane devices
Useful effect of the present invention
1. reduction energy consumption
Because anaerobic reaction does not need aeration, can save a large amount of power consumptions; Anaerobic reaction device every degraded 1kg's has in addition The machine thing will produce approximately contain 50～70% methane biogas 0.5m3, these gases can be used as the fuel utilization of high-quality; This Technological process is simple, and used power-equipment is few than conventional method, can reduce the energy consumption of polyethers sewage disposal.
2. effectively remove hardly degraded organic substance in the sewage
Because the degraded of organic matter has been experienced hydrolysis, acidifying, product acid and has been produced the methane four-stage in the anaerobic reaction device. So right Can become little branch in some by the hydrolysis acidification process as long-chain with the organic matter that is difficult to be degraded by aerobic bacteria of phenyl ring etc. Sub-material or chain rupture are utilized by anaerobe, improve the biodegradation of sewage.
Utilize strong oxidation material photocatalyst, further remove the residual organic substances in the sewage, these organic matters are biological places The material that reason is difficult to degrade can utilize the technology of photochemical catalytic oxidation effectively to remove.
3. reduce floor space and investment
Anaerobic reaction device volume load will be higher than aerobic reactor far away, and the organic load of anaerobic reaction device can reach 10 ~ 20kgCOD/m3.d, and traditional activated sludge process generally only has 0.5kgCOD/m3.d, so just can reduce floor space. The present invention adopts at present in the world state-of-the art anaerobic reaction device-expanded granular sludge bed anaerobic reaction device, adopts brand-new design, Greatly improved the efficient of reactor. So, can reduce the time of staying greatly, reduce floor space and reduce throwing Money.
4. system's running is stable
Anaerobic reaction device and contact oxidation technology that the present invention adopts have very high anti impulsion load, so for water quality and quantity Change and have better anti-hitting property of punching method. There is not the restriction of mud expansion phenomenon and dissolved oxygen in the anaerobic reaction device, for whole The stable operation of technology provides guarantee.
5. effectively solve residue Treatment of Sludge problem
The surplus sludge volume of this technology will be far smaller than the sludge yield that traditional digester is handled excess sludge, and the excess sludge organic content also will be lower than digester, has reduced the possibility of mud secondary pollution.Finally like this will alleviate the risk of sludge treatment cost and secondary pollution greatly.
6. effectively solve the pollution problem of reverse osmosis
Through the sewage after the Treatment by Photocatalysis Oxidation, at first handle, not only can further remove the suspended substance in the sewage, alleviate the operating pressure of follow-up reverse-osmosis treated device through continuous ultrafiltration, reduce the backwash cycle of reverse osmosis, raise labour efficiency and save running cost.
Embodiment
After production waste 1 process equalizing tank 2 and the oil trap 3, enter rise to 30 ℃ of finishing temperature in the dosing chamber 4, and carry out the adjusting (basicity is counted 1500mg/l with CaCO3) of basicity by dosing tank 14, add microelement nickel, manganese, copper, zinc and each 0.05mg/l of VITAMIN, enter anaerobic reactor 5 degradation of organic substances then and be converted into biogas as energy utilization; The water outlet of anaerobic reactor 5 continues degradation of organic substances in aerobic contact oxidation pond 7, provide the aerobic contact oxidation pond needed oxygen by blower fan 15; Discharging enters photocatalysis oxidation reaction device 8 mud-water separation is carried out in the water outlet of aerobic contact oxidation reactor 7 in settling tank 8 after, the oxygen that utilizes blower fan 15 to provide simultaneously, the organism that utilizes strong oxidizing property degradation biological method to be difficult to degrade, the water outlet of photocatalysis oxidation reaction device 8 enters continuous ultrafiltration treater 9, remove suspended substance and part colloidal type compound in the water, water outlet enters reverse-osmosis treated device 10.Through the processing of reverse-osmosis treated device 10, water outlet 11 water quality can reach the standard of recirculated cooling water supplementary feed, can reuse.The excess sludge that anaerobic reactor 5 and settling tank 7 are produced enters and dewaters 13 after concentration basin 12 concentrates.
Anaerobic reactor adopts expanded granular sludge bed anaerobic reactor (EGSB), and volumetric loading is 15kgCOD/m3.d.
The operating temperature of anaerobic reactor 5 is 30 ± 1 ℃.
Carry out the adjusting of basicity by dosing tank 14 interpolation liquid caustic soda, sheet alkali (composition all is NaOH), the basicity that guarantees water outlet is at 1500-3000mg/l, and basicity is with CaCO
3Meter.
The hydraulic detention time of anaerobic reactor 5 is 3 days, guarantees some organic pollutants that are difficult to degrade acidication and methanation completely, guarantees clearance, and clearance reaches 71%.
The biogas that anaerobic reactor 5 is produced can be delivered to boiler, and burning utilizes.
Photocatalysis oxidation reaction device 8, photocatalyst is a Nano titanium dioxide, above glass filler, utilize ultraviolet lamp to shine simultaneously, the wavelength of ultraviolet lamp is chosen in the irradiation of the light of 280nm, and the oxygen that utilizes blower fan 15 to provide simultaneously carries out aeration, the oxidation capacity of reinforcement photocatalysis oxidation reaction device 8.
Salinity in the condensed water of reverse-osmosis treated device 10 contains a large amount of phosphoric acid salt, and these have good fertility, can be used for irrigating the meadow.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100939533A CN100509661C (en) | 2004-12-16 | 2004-12-16 | Treating technique of polyether polyatomic alcohol producing sewage recovering and utilization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100939533A CN100509661C (en) | 2004-12-16 | 2004-12-16 | Treating technique of polyether polyatomic alcohol producing sewage recovering and utilization |
Publications (2)
| Publication Number | Publication Date |
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| CN1644537A CN1644537A (en) | 2005-07-27 |
| CN100509661C true CN100509661C (en) | 2009-07-08 |
Family
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|---|---|---|---|
| CNB2004100939533A Expired - Fee Related CN100509661C (en) | 2004-12-16 | 2004-12-16 | Treating technique of polyether polyatomic alcohol producing sewage recovering and utilization |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101624246B (en) * | 2009-08-19 | 2012-09-26 | 中国海洋石油总公司 | Technology for treating and reusing sewerages of industrial circulating water |
| CN102372402B (en) * | 2011-10-09 | 2014-04-09 | 南京工业大学 | Treatment method of polyether polyol wastewater |
| CN103288294B (en) * | 2013-05-07 | 2015-03-25 | 江苏长华聚氨酯科技有限公司 | Treatment method of polyether-containing wastewater |
| CN103449661B (en) * | 2013-05-07 | 2015-04-08 | 江苏长华聚氨酯科技有限公司 | Method for treating polyether wastewater |
| CN103288292B (en) * | 2013-05-07 | 2015-03-25 | 江苏长华聚氨酯科技有限公司 | Processing method for polyether-containing wastewater |
| CN105271590B (en) * | 2015-10-30 | 2017-08-04 | 中国石油天然气股份有限公司 | Treatment method of low-concentration methanol-containing wastewater in gas field |
| CN105417846B (en) * | 2015-11-13 | 2018-01-09 | 淄博正大聚氨酯有限公司 | The method for handling PPG technique waste water |
| CN107352732A (en) * | 2016-05-10 | 2017-11-17 | 张振家 | A kind of wastewater from edible oil production processing system and processing method |
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2004
- 2004-12-16 CN CNB2004100939533A patent/CN100509661C/en not_active Expired - Fee Related
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| CN1644537A (en) | 2005-07-27 |
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