CN1138709C - Purifying technology for micro polluted water source - Google Patents
Purifying technology for micro polluted water source Download PDFInfo
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- CN1138709C CN1138709C CNB991270509A CN99127050A CN1138709C CN 1138709 C CN1138709 C CN 1138709C CN B991270509 A CNB991270509 A CN B991270509A CN 99127050 A CN99127050 A CN 99127050A CN 1138709 C CN1138709 C CN 1138709C
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 229910001868 water Inorganic materials 0.000 title claims abstract description 72
- 238000005516 engineering process Methods 0.000 title claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 44
- 238000000108 ultra-filtration Methods 0.000 claims abstract description 22
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 19
- 238000005273 aeration Methods 0.000 claims abstract description 13
- 238000001728 nano-filtration Methods 0.000 claims abstract description 12
- 230000001112 coagulating effect Effects 0.000 claims description 10
- 238000001556 precipitation Methods 0.000 claims description 8
- 230000001954 sterilising effect Effects 0.000 claims description 5
- 238000000746 purification Methods 0.000 abstract description 10
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 6
- 238000004062 sedimentation Methods 0.000 abstract description 6
- 230000033228 biological regulation Effects 0.000 abstract description 3
- 239000002384 drinking water standard Substances 0.000 abstract description 3
- 239000003651 drinking water Substances 0.000 abstract description 2
- 238000012851 eutrophication Methods 0.000 abstract description 2
- 230000015271 coagulation Effects 0.000 abstract 2
- 238000005345 coagulation Methods 0.000 abstract 2
- 239000000843 powder Substances 0.000 abstract 2
- 235000012206 bottled water Nutrition 0.000 abstract 1
- 238000000034 method Methods 0.000 description 10
- 239000012528 membrane Substances 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 241000894006 Bacteria Species 0.000 description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- 238000011109 contamination Methods 0.000 description 4
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000002352 surface water Substances 0.000 description 4
- 239000008399 tap water Substances 0.000 description 4
- 235000020679 tap water Nutrition 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 244000005700 microbiome Species 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 241000700605 Viruses Species 0.000 description 2
- IPQVRLSXWJPESU-UHFFFAOYSA-N [N].ON=O Chemical compound [N].ON=O IPQVRLSXWJPESU-UHFFFAOYSA-N 0.000 description 2
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 2
- 239000003905 agrochemical Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 239000003610 charcoal Substances 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 230000035622 drinking Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000001471 micro-filtration Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- QGZKDVFQNNGYKY-OUBTZVSYSA-N Ammonia-15N Chemical compound [15NH3] QGZKDVFQNNGYKY-OUBTZVSYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 241000607142 Salmonella Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- -1 as CODMn Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- CUXQLKLUPGTTKL-UHFFFAOYSA-M microcosmic salt Chemical compound [NH4+].[Na+].OP([O-])([O-])=O CUXQLKLUPGTTKL-UHFFFAOYSA-M 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000036284 oxygen consumption Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002510 pyrogen Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000003206 sterilizing agent Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 241001515965 unidentified phage Species 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 230000003245 working effect Effects 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Separation Using Semi-Permeable Membranes (AREA)
- Water Treatment By Sorption (AREA)
Abstract
微污染水源水净化工艺由混凝沉淀池、粉末活性炭生物曝气池、超滤设备、纳滤设备、消毒设备构成。微污染水原水经混凝沉淀池、粉末活性炭生物曝气池处理后保证了进行超滤处理的水质要求和纳滤处理的水质要求，使得经本发明净化工艺处理的微污染水源水达到国家规定的饮用水标准。本发明适用于对遭受有机污染、富营养化污染、重金属污染的水源水进行净化处理，生产可饮用水，其抗污染冲击能力强，投资省，运行费用低，占地少，设备简单，运行灵活。
The micro-polluted source water purification process consists of coagulation sedimentation tank, powder activated carbon biological aeration tank, ultrafiltration equipment, nanofiltration equipment, and disinfection equipment. The raw water of slightly polluted water is treated by the coagulation sedimentation tank and the powder activated carbon biological aeration tank to ensure the water quality requirements for ultrafiltration treatment and nanofiltration treatment, so that the slightly polluted source water treated by the purification process of the present invention meets the national regulations. drinking water standards. The present invention is suitable for purifying source water suffering from organic pollution, eutrophication pollution, and heavy metal pollution to produce potable water. It has strong anti-pollution impact ability, low investment, low operating cost, less land occupation, simple equipment and easy operation. flexible.
Description
Technical field
The purification process of micro-polluted source water relates to producing the treatment technology of drinking water source water, is applicable to the surface water or the phreatic purification that suffer organic contamination, eutrophication pollution and heavy metal contamination.
Background technology
The surface water, underground water are a kind of source waters of good production tap water.But the difference of the surface water, underground water geographical position of living in, environment all can be subjected to pollution in various degree, mainly is turbidity and microorganism, must carry out purifying treatment for before drinking.At present, the water purification process that adopts under the goodish condition of source water water quality mainly contains: 1, be suitable for a. coagulation-precipitation-filtration-sterilization that extensive water purifies, b. coagulation-precipitation-activated carbon filter-sterilization, c. air supporting-filtration-sterilization, d. coagulation-precipitation-ozone and activated carbon filter tank-sterilization; 2, be suitable in, on a small scale a. coagulation-micro-filtration (ultrafiltration)-sterilization of purifying of water, b. charcoal absorption-ultrafiltration-sterilization, c. micro-filtration (ultrafiltration)-sterilization, d. nanofiltration-sterilization.When the water quality of China's source water can reach the surface water one-level of national regulation or secondary standard, all can produce qualified tap water by above-mentioned art breading.But, the practical situation of China are: the nearly half of the section water water quality in the city of flowing through, part urban groundwater, China's seven big water systems is subjected to pollution in various degree, as: organic content (oxygen consumption organic, a small amount of agricultural chemicals) or ammonia-nitrogen content severe overweight, most source water water quality is below grade III Standard.And the water purification process that China present city tap-water factory adopts is a. coagulation-precipitation-filtration-sterilization, b. coagulation-precipitation-activated carbon filter-sterilization, c. air supporting-filtration-sterilization.These technologies are extremely limited to the processing power of polluted source water: very high or because heavy rain when making the source water water quality mutation, the turbidity of water outlet can exceed standard when the source water turbidity; Control to free property bacteriophage relies on chlorination in the water outlet fully; High or when having transmissible disease virus, the dosage that must increase chlorine guarantees out that the water bacteriology index reaches the tap water requirement, but can cause a large amount of generations of " three cause " material thus, can cause potential to endanger to HUMAN HEALTH when entering organic matter of water content; And powerless substantially to the processing power of ubiquitous organic contamination of present source water and ammonia and nitrogen pollution, effluent quality can't satisfy drinks needs.
The source water of or little pollution contaminated at China, what apply at present is the water-purifying process of bio-contact oxidation-conventional water purification technology combination, this technology mainly is that the microorganism that relies on filling surface in the biological contact oxidation pond carries out decomposition and inversion to organism in the polluted source water and ammonia nitrogen, improves the influent quality that enters conventional water purifying plant.Bio-contact oxidation-conventional water purification technology combination process is not less than in water temperature under 15 ℃ the condition, and NH3-N removes 80-90%, and CODMn removes 20-30%, turbidity removal 50-80%, and when water temperature was lower than 15 ℃, NH3-N removed below 30%.The deficiency of this technology is: the clearance to pollutent is limited, makes effluent quality still undesirable; Temperature influence is big, and when temperature was lower than 15 ℃, microbic activity was subjected to very big inhibition, and organism and ammonia-N removal rate are descended significantly; In order to guarantee the efficient of clean water treatment, guarantee the normal operation of water treating equipment, higher to operator's technical requirements; Impact when load when the burst Pollution accident appears in source water, the serious phenomenon that descends can appear in effluent quality, can't drink at all.In addition, in recent years, domesticly begin to adopt coagulation-precipitation-ozone and activated carbon filter tank-sterilization process that the source water that is subjected to ammonia and nitrogen pollution is carried out purifying treatment, the shortcoming of this technology is: when source water organic contamination and ammonia and nitrogen pollution and when depositing, processing efficiency is had a strong impact on, and the required power consumption of water-purifying process increases; Ozone can and polluted source water in the reaction of some organism generate some objectionable impuritiess, make THMs (haloform) and the rising of Salmonella reversion test positive rate in the treated water outlet, even above former water.
Summary of the invention
At existing deficiency to the micro-polluted source water purification process technique, the contriver is through the further investigation to water-purifying process, it is strong to have proposed a kind of anti-water quality mutation ability, to pollutants removal rate height and investment and the relatively low purifying technology for micro polluted water source of working cost.
Technology of the present invention is to be made of coagulative precipitation tank, Powdered Activated Carbon bio-aeration pool, ultrafiltration apparatus, nanofiltration equipment and sterilization equipment.Micro-polluted source water at first enters coagulative precipitation tank and removes colloid and larger molecular organics, suspended solids, and according to coagulating agent kind and the dosage that phosphorus amount situation adjustment in the water will add, phosphorus carries out chemical reaction to remove excessive phosphorus in making it and intaking.The water outlet of coagulative precipitation tank enters the Powdered Activated Carbon bio-aeration pool subsequently, its principal mode is the suspension growth biological treating equipment that adds Powdered Activated Carbon, rely on microorganism to decompose by biodegradable organism, ammonia nitrogen then is converted into nitrous acid nitrogen and nitrate nitrogen by nitrifier and is finally finished by the conversion of nitrate nitrogen to nitrous acid nitrogen, nitrogen by denitrifying bacteria, and the organic pollution materials of difficult degradation is then removed by charcoal absorption in the source water.Squeeze into ultrafiltration apparatus by water pump subsequently through the source water that the Powdered Activated Carbon bio-aeration pool is handled, utilize ultra-filtration membrane that the excellent cutoff performance of bacterium, virus, larger molecular organics, pyrogen body is come out water sepn, guarantee effluent quality.Do not exceed standard as heavy metal ion in the source water of handling, and CODMn is less than 12mg/L, water outlet can directly carry out disinfection for drinking after uf processing.As the source water CODMn that handles greater than 12mg/L, or heavy metal ion exceeds standard, then after the ultrafiltration water outlet, adopt the nanofiltration device processes again, utilize nanofiltration membrane that the excellent cutoff performance of high volence metal ion, natural water body organism, colourity is separated heavy metal ion and remaining organism from water, make water outlet meet national drinking water standard, the nanofiltration membrane water outlet supplies to drink through the sterilization back.
Characteristics of the present invention are: 1. utilize ultra-filtration membrane to substitute the solid-liquid separating equipment (water through carry out a biological disposal upon after directly enter ultrafiltration apparatus) of second pond as biological treatment, make the nitrifier that in bio-contact oxidation is handled, is difficult to grow in this technology, obtain good growing environment, rely on the high density nitrifier of holding back formation to guarantee to remove ammonia nitrogen efficiently and stably under all temps.2. in the Powdered Activated Carbon bio-aeration pool, directly add Powdered Activated Carbon, make the difficult for biological degradation pollution substance adsorbed by gac, not only guaranteed the stable of ultra-filtration membrane water flux, prolonged the work-ing life of cleaning interval and film, and improved the effluent quality of ultra-filtration membrane.3. admit filter equipment behind the ultrafiltration apparatus, not only guaranteed the requirement of nanofiltration membrane separation to influent quality, make the steady running of nanofiltration equipment, and can further reduce remaining organic pollutant in the water, as CODMn, agricultural chemicals, simultaneously can remove heavy metal ion, obviously improve effluent quality, satisfy many-sided needs.4. compare with common process, adopt ultra-filtration membrane to separate and not only improved effluent quality, made things convenient for operational administrative, and, the impact of various pollution loads is had extremely strong tolerance, can not worsen the serious deterioration that cause effluent quality suddenly because of water quality.5. in ultrafiltration or the nanofiltration water outlet, not only organic content is low, and the residual quantity of bacterium is also few, and sterilizing agent dosage required during sterilization can reduce significantly, not only helps HUMAN HEALTH but also reduced working cost.Adopt this combination process, during to the reconstruction of existing waterworks, at first can make full use of the coagulating sedimentation device of existing waterworks, secondly, filtration unit can be transformed into the Powdered Activated Carbon bio-aeration pool, only need add the ultra-filtration membrane tripping device and the Powdered Activated Carbon dosing system just can be dealt with problems.Investment for trnasforming urban land is few, and quantities is little, and working cost is low with respect to existing water purification treatment technology.
Description of drawings
Accompanying drawing is the process flow diagram of the embodiment of the invention.
Embodiment
Be that 1000 tons/day ground pollution source water is handled and to be further described to scale in conjunction with the accompanying drawings.
Technology of the present invention is to be made of coagulative precipitation tank, Powdered Activated Carbon bio-aeration pool, ultrafiltration apparatus, nanofiltration equipment and the equipment of disappearing.CODMn concentration＜the 12mg/L of ground pollution source water, NH3-N＜7.5mg/L, after entering coagulating sedimentation, adopt the FeCl3 coagulating sedimentation, after removing larger molecular organics, colloid, microcosmic salt and suspended solids, CODMn can reduce about 30%, has also alleviated the organic loading of subsequent biological treatment simultaneously; The coagulating sedimentation water outlet enters the Powdered Activated Carbon bio-aeration pool subsequently, the Powdered Activated Carbon that adds 50mg/L in the pond is carried out a biological disposal upon, water outlet through biological treatment enters ultrafiltration apparatus processing, CODMn concentration＜3mg/L in the water outlet, NH3-N＜0.5mg/L, the removal of bacteria rate is greater than 99.5%, turbidity＜0.5NTU, through sterilization back (1.0mgCl2/L) long storage time, the bacteriology index also reaches requirement, the drinking water standard that meets national regulation, and the water treatment expense is 3 yuan/ton.
Claims (1)
1. purifying technology for micro polluted water source is characterized in that: be made of coagulative precipitation tank, Powdered Activated Carbon bio-aeration pool, ultrafiltration apparatus, nanofiltration equipment, sterilization equipment; After the Powdered Activated Carbon bio-aeration pool is arranged on coagulative precipitation tank, in the Powdered Activated Carbon bio-aeration pool, adopt the mode that adds Powdered Activated Carbon to carry out a biological disposal upon; Connect ultrafiltration apparatus behind the Powdered Activated Carbon bio-aeration pool, water outlet directly adopts ultrafiltration apparatus to handle after carrying out a biological disposal upon, and connects nanofiltration equipment behind ultrafiltration apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991270509A CN1138709C (en) | 1999-12-30 | 1999-12-30 | Purifying technology for micro polluted water source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991270509A CN1138709C (en) | 1999-12-30 | 1999-12-30 | Purifying technology for micro polluted water source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1301671A CN1301671A (en) | 2001-07-04 |
| CN1138709C true CN1138709C (en) | 2004-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991270509A Expired - Fee Related CN1138709C (en) | 1999-12-30 | 1999-12-30 | Purifying technology for micro polluted water source |
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| CN (1) | CN1138709C (en) |
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| CN100375726C (en) * | 2005-10-27 | 2008-03-19 | 韩春来 | Mambrane method of recovery and utilization of refining oil and chemical polluted water and its equipment |
| CN100450592C (en) * | 2007-02-15 | 2009-01-14 | 三达膜科技（厦门）有限公司 | Metal smelting factory sewage reclaiming method based on membrane filtering technique |
| CN103253787B (en) * | 2012-02-17 | 2016-06-01 | 上海市政工程设计研究总院（集团）有限公司 | The low turbid algae concentrated feeding water strengthening and processing device of seasonal metallic pollution and technique thereof |
| CN102531278B (en) * | 2012-03-01 | 2013-04-03 | 董文艺 | Process and system for deeply treating drinking water through two-section membrane method |
| CN102838253B (en) * | 2012-07-24 | 2014-03-19 | 淮南矿业(集团)有限责任公司 | Device and method for treating domestic sewage into water for underground production |
| CN103663796A (en) * | 2013-12-23 | 2014-03-26 | 上海申迪（集团）有限公司 | Deep dephosphorization method for slightly-polluted water and equipment thereof |
| CN104556481A (en) * | 2014-12-24 | 2015-04-29 | 北京桑德环境工程有限公司 | Treatment system and method for preparing high-hardness underground water into domestic drinking water |
| CN105984995A (en) * | 2015-02-09 | 2016-10-05 | 上海勘测设计研究院有限公司 | Off-site purification and water quality keeping system for water in riverway-type water source |
| CN105859002B (en) * | 2016-04-26 | 2019-01-18 | 广州中国科学院先进技术研究所 | Remove the device of disinfection by-products in water removal |
| CN105858955B (en) * | 2016-04-26 | 2019-01-18 | 广州中国科学院先进技术研究所 | The method for going disinfection by-products in water removal |
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| CN108862934A (en) * | 2018-08-10 | 2018-11-23 | 苏州立升膜分离科技有限公司 | Effluent treatment plant and drinking water purification system comprising the device |
| CN108911417A (en) * | 2018-08-10 | 2018-11-30 | 苏州立升膜分离科技有限公司 | Drinking water purification system |
| CN111480656A (en) * | 2020-04-30 | 2020-08-04 | 同济大学 | Method suitable for efficiently preparing high-concentration disinfectant monochloramine in water works |
| CN113943076A (en) * | 2021-08-09 | 2022-01-18 | 中国电建集团华东勘测设计研究院有限公司 | Advanced treatment process and treatment equipment suitable for micro-polluted complex multi-water source water supply plant |
| CN114031221A (en) * | 2021-12-03 | 2022-02-11 | 黄河勘测规划设计研究院有限公司 | Water treatment system and method for treating high-sand-content source water |
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1999
- 1999-12-30 CN CNB991270509A patent/CN1138709C/en not_active Expired - Fee Related
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Assignee: Shanghai Yike Green Engineering Co., Ltd. Assignor: Tongji University Contract fulfillment period: 2009.7.1 to 2014.7.31 contract change Contract record no.: 2009990000802 Denomination of invention: Purifying technology for micro polluted water source Granted publication date: 20040218 License type: Exclusive license Record date: 2009.7.27 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.7.1 TO 2014.7.31; CHANGE OF CONTRACT Name of requester: SHANGHAI YIBO GREEN ENGINEERING CO., LTD. Effective date: 20090727 |
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