CN103626331A - Desulfurization wastewater zero discharge treatment device and method - Google Patents
Desulfurization wastewater zero discharge treatment device and method Download PDFInfo
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Abstract
The invention relates to a desulfurization wastewater 'zero discharge' treatment method. Strong brine which comes out from a high-pressure film and has the salt content of about 15%-20%, and pulverized fuel ash of an ash yard react for crystallization by chemical feeding, sediment membrane concentration and combination of a sea water film and a pollution-resistant high-pressure film in a reverse osmosis strong brine pretreatment method, and a set of complete desulfurization wastewater 'zero discharge' treatment process system is formed; therefore, not only can suspended matters, heavy metal ions, fluorine ions and other foreign ions in desulfurization wastewater be removed in a form of precipitated contaminants, but also water can be produced with the recovery rate of 78%-90%, and chlorine ions and other dissolved ions are remained in the 10%-20% strong brine; less strong brine is available, and when the strong brine is sprayed to the ash yard of an industrial and mining enterprise, the investment and the operating cost of the desulfurization waste water 'zero discharge' treatment method are far less than those of an evaporation treatment technology which only has the step of chemical feeding pretreatment.
Description
Technical field
The present invention relates to a kind for the treatment of process that desulfurization wastewater that wet desulphurization produces carries out reaching after advanced treatment " zero release ".Belong to industrial effluent reusing and zero release field.
Background technology
Along with China's industrial expansion, energy consumption is more and more, and China is coal production in the world and consumes big country, and the ratio of coal in China's energy structure be up to 76.2%, the SO of discharge
2in 90% come from fire coal.Coal-fired flue gas desulfurization is to control coal firing boiler SO
2the technical way of discharge, wherein Limestone-gypsum Wet Flue Gas Desulfurization Process technique is because of features such as its desulfuration efficiency are high, absorption agent utilization ratio is high, adaptability is good, be at present in the world technology the most ripe, apply maximum flue gas desulfurization techniques, the first-selected sulfur removal technology that Ye Shi Environmental Protection in China general bureau is recommended, but this sulfur removal technology can produce a certain amount of desulfurization wastewater, waste water is slightly acidic, contains suspended substance, supersaturation sulphite, vitriol, heavy metal, approximately 1.5%～3.5% chlorine and dithionate and a part of organism of reduction-state.At present desulfurization wastewater after treatment heavy metal and fluorion can reach discharging standards, but suspended substance, organism do not reach stably reaching standard discharge, chlorine ion concentration compare Gao， each place Environmental Protection Agency forbids directly the desulfurization wastewater after processing to be entered to water body.This will have important and far-reaching meaning to the industrial sustainable development of country and environment protection.
The call of a lot of enterprise response countries " energy-saving and emission-reduction ", carries out advanced treatment by all waste water of industry in recent years, the water after processing can be carried out to resource utilization reuse on the one hand, can reduce the discharge to environment on the other hand.Developed regions are due to higher to environmental requirement, even require most of enterprise to reach " zero release ", be embodied at present Coastal Area of Guangdong Province and In Middle And Lower Reaches of Changjiang River, along with social materials is abundant, people are more and more higher to the requirement of environment, believe that enterprise's " zero release " in most domestic area can be more and more.
Current domestic processing desulfurization wastewater often adopts physico-chemical process, after adjust pH dosing flocculation sediment process after discharge, this method can make all stably reaching standard discharges of heavy metal ion and fluorion, but suspended substance, organism often can not stably reaching standard discharges, also the treatment process having is to adopt chemistry-microfiltration membrane integral process to process desulfurization wastewater, dosing in reaction tank, microfiltration membrane is placed in to chemical reaction pond, micro-filtration is as the subsequent disposal of chemical technology, this processing mode, in desulfurization wastewater, film is easily dirty stifled, and microfiltration membrane can only be removed the impurity such as suspended substance, heavy metal ion in addition, can not reduce the impurity concentrations such as chlorion, can not decrement discharge, be to adopt dosing to carry out entering preheating vapo(u)rization system after pre-treatment in addition, this method can obtain fresh water that can reuse, but facility investment is high, and working cost is high, and this method is subject to certain restrictions, adopt in addition membrane method treating process, pre-treatment, one-level film is processed and secondary film is processed, pre-treatment adopts coagulation mechanism, through reaction, clarification, remove suspended substance (SS), heavy metal ion, fluorion, calcium ion, magnesium ion etc., water outlet regulates pH to 5～9, one-level film is processed monovalent ion and divalent ion is separated, monovalent ion sees through film and enters in fresh water, divalent ion is stayed in dense water, secondary film is processed the one-level fresh water that the processing of one-level film is obtained and is carried out the processing of secondary film, salt in one-level fresh water is separated with water, this method is because pre-treatment is not thorough, the processing of one-level film can cause the pollution of film, in whole treating processes, can form secondary fresh water and the higher dense water of secondary of saltiness containing a small amount of monovalent salt on the other hand, system recoveries rate is lower, for the high feature of the saltiness of desulfurization wastewater and film computed in software, the rate of recovery can not be higher than 60%, the final waste liquid amount producing is relatively many, if subsequent evaporation device, investment and running cost can not significantly reduce, this mode is because one-level film is processed and secondary film is processed the consumption that all needs electric energy, and system recoveries rate is low, also has certain quantity discharged, enterprise for needs " zero release " can produce certain difficulty.
In order to solve desulfurization wastewater, process and reach the problem of " zero release ", the present invention provide a kind of reliable, the method that significantly reduces of investment running cost.
Summary of the invention
The present invention seeks to, in order to solve desulfurization wastewater, process and reach " zero release ", the invention provides a kind of desulfurization wastewater " zero release " treatment process, especially utilize the dosing in reverse osmosis concentrated salt solution pretreatment process, throw out membrane concentration and seawater film and the combination of anti-pollution high-pressure membrane, flyash reactive crystallization by the strong brine of high-pressure membrane saltiness out approximately 15～20% with ash field, form a set of complete desulfurization wastewater " zero release " treatment process system, not only make the suspended substance in desulfurization wastewater, heavy metal, the foreign ions such as fluorine are removed with the form of deposit fouling thing, and can reach the product water of 78%～90% rate of recovery, other ions of chlorion and dissolving thereof are stayed in approximately 10～20% strong brine, this part strong brine is because the water yield is less, ash for industrial and mining enterprises, certainly also can carry out evaporation process according to the particular case of enterprise, its investment and working cost can be well below only carrying out the pretreated evaporation treatment process of dosing.Technique of the present invention, owing to having adopted dosing to sink earnest membrane concentration technique, makes the system of seawater film and anti-pollution high-pressure membrane reach the very high rate of recovery; Meanwhile, guarantee the safe and reliable operation of whole system, reduce the cleaning frequency of film system, extended to more than 5 years the work-ing life of seawater film and anti-pollution high-pressure membrane.
Technical scheme of the present invention is: a kind of desulfurization wastewater " zero release " treatment unit, comprise reaction precipitation concentration basin, and the liquid of described reaction precipitation concentration basin is connected and is pumped into circulation film by the first high-pressure pump pipe; The dense water of described circulation film is connected and is back to reaction precipitation concentration basin by reflux line;
The filtrate of described circulation film is connected and is pumped into seawater film by the second high-pressure pump pipe, and the dense water of described seawater film is connected and pumped into anti-pollution high-pressure membrane by energy reclaiming high-pressure pump pipeline; The filtrate of described seawater film is connected mixing with the filtrate of described anti-pollution high-pressure membrane by pipeline, is delivered to outside recycling equipment;
The dense water conservancy of described anti-pollution high-pressure membrane flows out with the side outlet of anti-pollution high-pressure membrane.
Further, described reaction precipitation concentration basin bottom is provided with sludge circulation mouth, between described sludge circulation mouth and the fluid inlet of reaction precipitation concentration basin, by pipeline, is connected with sludge circulation pump.
Further, the dense water conservancy of described anti-pollution high-pressure membrane is with the side outlet of anti-pollution high-pressure membrane, be connected to energy recycle device by pipeline, described energy recycle device is connected with energy reclaiming high-pressure pump with the second high-pressure pump respectively, and the outlet of described energy recycle device passes into peripheral equipment.Prevent power loss, reduced the energy consumption of system.
Further, described circulation film employing film pipe diameter 5～12mm, film hole diameter are 0.05～0.1um.
Further, what described anti-pollution high-pressure membrane adopted is the desalination high-pressure membrane of runner, the short flow process of 7cm between the wide diaphragm of 1.5～2mm, operating pressure can be up to 90bar～140bar, and between diaphragm, be provided with flow guiding disc, on flow guiding disc, there is salient point, under High Pressure, treatment solution is turbulization in diaphragm, the turbulent flow for the treatment of solution between wide runner and diaphragm, can avoid on the one hand the dirt of pollutent block up and reduce the required pressure of desalination, the saturation ratio that the salt concentration in waste water can be concentrated on the other hand to various salts is closely worth.
The present invention also provides a kind of desulfurization wastewater " zero release " treatment process, by reaction precipitation concentration basin, circulation film and the combination of anti-pollution high-pressure membrane, the reacted desulfurization wastewater of the chemical agent that adds removal heavy metal, fluorine, hardness is pumped into circulation film with the first high-pressure pump of large flow by desulfurization wastewater;
Utilize circulation film that the mud granule in desulfurization wastewater is separated with water, with the dense water of circulation film of mud granule, by reflux line, be back to reaction precipitation concentration basin, the circulation membrane filtration fluid filtering out pumps into seawater film by the second high-pressure pump by filtrate;
Utilize seawater film to carry out concentrating and desalinating processing to the filtrate of circulation film, can be by the strong brine of Waste water concentrating to 6～8% saltiness, seawater film strong brine after processing utilizes seawater film strong brine overbottom pressure and by energy reclaiming high-pressure pump supercharging, seawater film strong brine is pumped into anti-pollution high-pressure membrane, and operating pressure can be up to 90bar～140bar;
Utilize anti-pollution high-pressure membrane to carry out further concentrating and desalinating processing to seawater film strong brine, can be by the strong brine of Waste water concentrating to 15～20% saltiness, anti-pollution high-pressure membrane strong brine amount after processing only has 10～20% of the front seawater film strong brine amount of processing, pressure is higher, by means of high-pressure membrane strong brine side outlet pressure, the dense water of high-pressure membrane is delivered to ash, utilize the solid phase body of flyash high dispersive as the crystallization nucleome of the dense water of high-pressure membrane, by the dense water absorption of high-pressure membrane and the natural evaporation of wind, can make the salt crystallization in flyash in the dense water of high-pressure membrane, dispose in the lump with flyash,
Anti-pollution high-pressure membrane filtrate after processing is mixed with seawater membrane filtration fluid, and mixed total solvability solid substance is less than 2000ppb, and direct reuse is in process water.
The method be take mud and removing as crystallisate with an ash flyash by the dithionate of the suspended substance in desulfurization wastewater, heavy metal, fluorine, chlorine plasma, supersaturation and sulphite, vitriol, reduction-state and partial organic substances, carried out harmless treatment, and desulfurization wastewater is after treatment turned waste into wealth, resource utilization is back in production system, and " zero release " that reached desulfurization wastewater processed.
Further, described reaction precipitation concentration basin adopts sludge circulation, increase mud granule and sedimentary contact probability, the medicament not playing a role continues to react in waste water, save the chemical feeding quantity in reaction settling basin, mud in corresponding minimizing reaction settling basin concentrates the mud in reaction settling basin simultaneously.
Further, between described system seawater film and anti-pollution high-pressure membrane and pollution high voltage film strong brine side outlet be provided with energy recycle device, anti-pollution high-pressure membrane entrance has reclaimed the energy of seawater film strong brine outlet, anti-pollution high-pressure membrane strong brine side outlet reclaims unnecessary energy to anti-pollution high-pressure membrane entrance high-pressure pump, prevent power loss, reduced the energy consumption of system.
Further, it is 0.05～0.1um that described circulation film adopts film pipe diameter 5～12mm, film hole diameter, has the flow quantity of reflux of 3～4 times, the ultrafiltration tube membrane that surface velocity reaches 2.5～4m/s.
Further, described desulfurization wastewater pre-treatment has adopted dosing reaction precipitation concentration basin to be combined with circulation film, removes larger molecular organics, and effluent quality turbidity is less than 1NTU.Even be less than 0.5NTU, meet the influent quality requirement of seawater film.
Further,
Desulfurization wastewater " zero release " treatment process, adopt dosing reaction settling basin, the concentrated recycle pump of mud, circulation film, seawater film, anti-pollution high-pressure membrane and energy recycle device, the strong brine of seawater film enters anti-pollution high-pressure membrane, and the strong brine of high-pressure membrane utilizes overbottom pressure to the ash outside several kilometers.
The invention has the beneficial effects as follows:
1, processed the more complicated desulfurization wastewaters of composition such as containing high suspended matter, supersalinity, heavy metal and organism, and reached " zero release ";
2, the fresh water resourcebility of the desulfurization wastewater after processing is back to enterprise's industrial water system, has reached and has economized on resources, the effect of economic environmental protection;
3, by the method for the treatment of wastes with processes of wastes against one another, process the dense water of high-pressure membrane, saved investment, running cost.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
In figure: reaction precipitation concentration basin 1, the first high-pressure pump 2, circulation film 3, the second high-pressure pump 4, seawater film 5, energy reclaiming high-pressure pump 6, anti-pollution high-pressure membrane 7, energy recycle device 8, sludge circulation pump 9.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Referring to Fig. 1 process flow sheet:
1) dosing throw out film condensing device
Utilize a part of equipment in reverse osmosis concentrated salt solution pretreatment process, it is the dosing throw out membrane concentration of reaction precipitation concentration basin 1 and 3 combinations of circulation film, in reaction zone, add removal heavy metal, fluorine, suspended substance and adjusting pH value medicine, general lime or caustic soda, organosulfur, flocculation agent and coagulant aids, its chemical feeding quantity determines according to the medium content of access to plant, in precipitation enrichment region, there is sludge circulation pump 9 water inlet place to reaction settling basin by the part sludge reflux of precipitation enrichment region, in settling region, mix with circulation membrane concentration liquid simultaneously, increase on the one hand precipitate particles, promote the effect of particulate matter precipitation, can make on the other hand the excessive no pharmaceutical chemicals of reaction that also adds fully be reacted, reduce chemical feeding quantity, in reaction precipitation concentration basin 1, be furnished with stirrer and be provided with certain hydraulic detention time, reach abundant reaction precipitation and concentrated object, by the first high-pressure pump 2, reaction precipitation concentration basin clarification medium transport is arrived to circulation film 3, utilizing flow velocity, 5～12mm film pipe diameter and the film hole diameter of circulation film 3 surface 2.5～4m/s is 0.05～0.1um, approximately there is the flow of 3～4 times to be back to reaction precipitation concentration basin, when film surface is kept clean, can make effluent quality reach turbidity and be less than 1NTU, what have is even less than 0.5NTU, and effluent quality turbidity can meet the influent quality requirement of seawater film 5 completely.Reach 3 pairs of mud granules that reaction precipitation concentration basin 1 produces of circulation film above and carry out separated object with water.
2) seawater film device
The water outlet of circulation film 3 of take is water inlet, by the second high-pressure pump 4, pump into seawater film 5, the ratio of desalinization of seawater film 5 all reaches more than 99%, the rate of recovery reaches 50～70%, desulfurization wastewater can be concentrated to the salt solution of 6～8% saltiness, operating pressure 35～80bar, water outlet directly can be back to process water, and strong brine enters follow-up processing.
3) anti-pollution high-pressure membrane device.
Utilize seawater film 5 strong brine overbottom pressure, energy reclaiming high-pressure pump 6 superchargings are set, pump into anti-pollution high-pressure membrane 7, the ratio of desalinization of anti-pollution high-pressure membrane 7 all reaches more than 96%, the rate of recovery reaches 50～70%, desulfurization wastewater can be concentrated to the strong brine of 15～20% saltiness, anti-pollution high-pressure membrane 7 adopts between diaphragms the approximately wide runner of 1.5～2mm of runner, the short flow process of flow process 7cm, operating pressure can be up to 90bar～140bar, between diaphragm, be also provided with flow guiding disc, on flow guiding disc, there is salient point, under High Pressure, treatment solution is turbulization in diaphragm, the turbulent flow for the treatment of solution between wide runner and diaphragm, can avoid on the one hand the dirt of pollutent to block up and the required pressure of reduction desalination, the saturation ratio that the salt concentration in waste water can be concentrated on the other hand to various salts is closely worth.
4) energy recycle device
Because seawater film strong brine wall pressure and inlet pressure differ 1～3bar, seawater film strong brine side outlet pressure is relatively high, for saving working cost, make full use of seawater film strong brine wall pressure, between seawater film 5 and anti-pollution high-pressure membrane 7, energy reclaiming high-pressure pump 6 is set, directly the dense water of seawater film is pumped into anti-pollution high-pressure membrane; Strong brine after anti-pollution high-pressure membrane 7 is processed is sprayed onto ash.
If the power station of a 600MW unit, desulfurization wastewater 8～10t/h, after treatment, the strong brine of high-pressure membrane approximately only has 1～2t/h, utilize the solid phase body of flyash high dispersive as the crystallization nucleome of strong brine, can can make the salt crystallization in flyash in strong brine effectively by strong brine absorption and the natural evaporation of wind, dispose in the lump with flyash.According to In Middle And Lower Reaches of Changjiang River average rainfall and the average evaporation capacity enquiry data of every month, as calculated, even in rainy season, the strong brine after concentrating shines for waste ash pond spray the object that reaches natural evaporation completely, strong brine is not flow in the Nature, greatly reduce the threat to environment.
If the Hui Changlizhu plant area of enterprise is not very far away, can energy recycle device 8 be set at the dense water side outlet of anti-pollution high-pressure membrane, due to the little feature of the high water yield of pressure, adopt the energy of the turbine power retrieving arrangement generation that only contacts dense water to be directly passed to the second high-pressure pump 4 of seawater film 5 entrances and the energy reclaiming high-pressure pump 6 of anti-pollution high-pressure membrane 7 entrances, reduce the power of high-pressure pump.
Although prior art scheme of the present invention and preferred embodiment statement are as above, so it is not in order to limit the present invention.Persond having ordinary knowledge in the technical field of the present invention, without departing from the spirit and scope of the present invention, when doing various variations, substitute and retouching.Therefore, protection scope of the present invention is when being as the criterion depending on claims person of defining.
Claims (10)
1. desulfurization wastewater " zero release " treatment unit, comprises reaction precipitation concentration basin (1), it is characterized in that: the liquid of described reaction precipitation concentration basin (1) is connected and pumped into circulation film (3) by the first high-pressure pump (2) pipeline; The dense water of described circulation film is connected and is back to reaction precipitation concentration basin (1) by reflux line;
The filtrate of described circulation film (3) is connected and is pumped into seawater film (5) by the second high-pressure pump (4) pipeline, and the dense water of described seawater film is connected and pumped into anti-pollution high-pressure membrane (7) by energy reclaiming high-pressure pump (6) pipeline; The filtrate of described seawater film (3) is connected mixing with the filtrate of described anti-pollution high-pressure membrane (7) by pipeline, is delivered to outside recycling equipment;
The dense water conservancy of described anti-pollution high-pressure membrane (7) flows out with the side outlet of anti-pollution high-pressure membrane.
2. desulfurization wastewater according to claim 1 " zero release " treatment unit, it is characterized in that: described reaction precipitation concentration basin (1) bottom is provided with sludge circulation mouth, between described sludge circulation mouth and the fluid inlet of reaction precipitation concentration basin, by pipeline, is connected with sludge circulation pump (9).
3. desulfurization wastewater according to claim 1 " zero release " treatment unit, it is characterized in that: the dense water conservancy of described anti-pollution high-pressure membrane (7) is with the side outlet of anti-pollution high-pressure membrane, be connected to energy recycle device (8) by pipeline, described energy recycle device (8) is connected with energy reclaiming high-pressure pump (6) with the second high-pressure pump (4) respectively, and the outlet of described energy recycle device (8) passes into peripheral equipment.
4. desulfurization wastewater according to claim 1 " zero release " treatment unit, is characterized in that: it is 0.05～0.1um that described circulation film (3) adopts film pipe diameter 5～12mm, film hole diameter.
5. desulfurization wastewater according to claim 1 " zero release " treatment unit, it is characterized in that: what described anti-pollution high-pressure membrane (7) adopted is the desalination high-pressure membrane of runner, the short flow process of 7cm between the wide diaphragm of 1.5～2mm, operating pressure can be up to 90bar, and between diaphragm, be provided with flow guiding disc, on flow guiding disc, have salient point.
6. a desulfurization wastewater " zero release " treatment process, it is characterized in that: by reaction precipitation concentration basin, circulation film and the combination of anti-pollution high-pressure membrane, the reacted desulfurization wastewater of the chemical agent that adds removal heavy metal, fluorine, hardness is pumped into circulation film with the first high-pressure pump of large flow by desulfurization wastewater;
Utilize circulation film that the mud granule in desulfurization wastewater is separated with water, with the dense water of circulation film of mud granule, by reflux line, be back to reaction precipitation concentration basin, the circulation membrane filtration fluid filtering out pumps into seawater film by the second high-pressure pump by filtrate;
Utilize seawater film to carry out concentrating and desalinating processing to the filtrate of circulation film, by the strong brine of Waste water concentrating to 6～8% saltiness, seawater film strong brine after processing utilizes seawater film strong brine overbottom pressure and by energy reclaiming high-pressure pump supercharging, seawater film strong brine is pumped into anti-pollution high-pressure membrane, and operating pressure reaches 90bar～140bar;
Utilize anti-pollution high-pressure membrane to carry out further concentrating and desalinating processing to seawater film strong brine, can be by the strong brine of Waste water concentrating to 15～20% saltiness, anti-pollution high-pressure membrane strong brine amount after processing only has 10～20% of the front seawater film strong brine amount of processing, pressure is higher, by means of high-pressure membrane strong brine side outlet pressure, the dense water of high-pressure membrane is delivered to ash, utilize the solid phase body of flyash high dispersive as the crystallization nucleome of the dense water of high-pressure membrane, by the dense water absorption of high-pressure membrane and the natural evaporation of wind, can make the salt crystallization in flyash in the dense water of high-pressure membrane, dispose in the lump with flyash,
Anti-pollution high-pressure membrane filtrate after processing is mixed with seawater membrane filtration fluid, and mixed total solvability solid substance is less than 2000ppb, and direct reuse is in process water.
7. desulfurization wastewater according to claim 6 " zero release " treatment process, it is characterized in that: described reaction precipitation concentration basin adopts sludge circulation, increase mud granule and sedimentary contact probability, the medicament not playing a role continues to react in waste water, save the chemical feeding quantity in reaction settling basin, mud in corresponding minimizing reaction settling basin concentrates the mud in reaction settling basin simultaneously.
8. a kind of desulfurization wastewater according to claim 6 " zero release " treatment process, it is characterized in that, between described system seawater film and anti-pollution high-pressure membrane and pollution high voltage film strong brine side outlet be provided with energy recycle device, anti-pollution high-pressure membrane entrance has reclaimed the energy of seawater film strong brine outlet, and anti-pollution high-pressure membrane strong brine side outlet reclaims unnecessary energy to anti-pollution high-pressure membrane entrance high-pressure pump.
9. according to a kind of desulfurization wastewater " zero release " treatment process described in claim 1 and 2, it is characterized in that, it is 0.05～0.1um that described circulation film adopts film pipe diameter 5～12mm, film hole diameter, has the flow quantity of reflux of 3～4 times, the ultrafiltration tube membrane that surface velocity reaches 2.5～4m/s.
10. according to a kind of desulfurization wastewater " zero release " treatment process described in claim 1 and 3, it is characterized in that, described desulfurization wastewater pre-treatment has adopted dosing reaction precipitation concentration basin to be combined with circulation film, removes larger molecular organics, and effluent quality turbidity is less than 1NTU.
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| JPH1085743A (en) * | 1996-09-12 | 1998-04-07 | Japan Organo Co Ltd | Method and apparatus for treating water containing boron |
| CN101708911A (en) * | 2009-11-23 | 2010-05-19 | 苏州凯新分离科技有限公司 | Desulfuration waste water treatment process with membrane method |
| CN102583831A (en) * | 2012-03-09 | 2012-07-18 | 广西宇达水处理设备工程有限公司 | Wastewater treatment and reusing membrane separation treatment technology |
| CN103172203A (en) * | 2013-03-28 | 2013-06-26 | 南京中电环保股份有限公司 | Pretreatment method of anti-osmosis strong brine |
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2013
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1085743A (en) * | 1996-09-12 | 1998-04-07 | Japan Organo Co Ltd | Method and apparatus for treating water containing boron |
| CN101708911A (en) * | 2009-11-23 | 2010-05-19 | 苏州凯新分离科技有限公司 | Desulfuration waste water treatment process with membrane method |
| CN102583831A (en) * | 2012-03-09 | 2012-07-18 | 广西宇达水处理设备工程有限公司 | Wastewater treatment and reusing membrane separation treatment technology |
| CN103172203A (en) * | 2013-03-28 | 2013-06-26 | 南京中电环保股份有限公司 | Pretreatment method of anti-osmosis strong brine |
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Address after: 211102 Jiangning City, Nanjing Province, the integrity of the road No. 1800, Patentee after: NANJING CEC ENVIRONMENTAL PROTECTION CO., LTD. Address before: 211102 Jiangning City, Nanjing Province, the integrity of the road No. 1800, Patentee before: Nanjing CEC Environmental Protection Co., Ltd. |