CN101913741B - System and method for treating sludge containing heavy metal - Google Patents
System and method for treating sludge containing heavy metal Download PDFInfo
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- CN101913741B CN101913741B CN 201010257407 CN201010257407A CN101913741B CN 101913741 B CN101913741 B CN 101913741B CN 201010257407 CN201010257407 CN 201010257407 CN 201010257407 A CN201010257407 A CN 201010257407A CN 101913741 B CN101913741 B CN 101913741B
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Abstract
The invention discloses a system and a method for treating sludge containing heavy metal. The system comprises a sludge conveyer, a mixed reactor, a drier, a medicament metering pump, a sludge discharge conveyer, a waste gas treatment device and a medicament storage tank, wherein the medicament metering pump uniformly sprays a specific heavy metal complexing agent into the mixed reactor, and the specific heavy metal complexing agent is sufficiency mixed with the sludge carried by the sludge conveyer; the heavy metal contained in the sludge sufficiency reacts with the specific heavy metal complexing agent and is transformed into a stable and harmless state; after the complex reaction, the sludge enters the drier for drying treatment, and discharged sludge can meet the requirements for sanitary landfill. The method reduces the poisonousness of the heavy metal by adding the complexing agent to the sludge and stabilizing and passivating the heavy metal contained in the sludge. The sludge can meet the requirements for landfill after being treated by the system, therefore the harmless, stabilization and reduction treatment of the sludge is realized. The invention has simple process, little equipment, flexible operation and can be widely suitable for removing various heavy metal contained in dewatering sludge.
Description
Technical field
The present invention relates to field of sludge treatment, especially relate to a kind of system and method for handling sludge containing heavy metal.
Background technology
China municipal sewage plant generally all adopts the mechanical dehydration machine that excess sludge is carried out processed; Moisture percentage in sewage sludge after the processed is higher; Be generally 75～85%; Organic content is high in the mud, contains the parasite fourth of the twelve Earthly Branches, pathogenic micro-organism, heavy metal etc., and particularly the existence of heavy metal makes it be difficult to reach the sanitary landfill standard.Simultaneously, heavy metal has acute or chronic toxicity usually, can poison human body in every way, like carcinogenic or non-some disease that directly causes.Conventional heavy metal stabilization technology kind is a lot, but the influence that when being used for the heavy metal treatment of wastes produced, all has limitation, particularly these technology changed by the pH value.When the pH value was low, heavy metal ion is stripping again, does not reach the purpose of heavy metal refuse long term stabilization, in the ultimate disposal of refuse, will cause secondary pollution to environment.
At present, the sludge heavy-metal of practical application stabilization/solidified method has cement and lime solidification method, the collaborative burning method of cement kiln, chemical reagent extraction method, mikrobe leaching, phytoremediation etc.; Wherein, cement and lime solidification method technology is simple, treatment effect is general, but the sludge volume increase-volume is bigger, is unfavorable for follow-up sludge disposal; There are potential hazards such as secondary pollution in methods such as mikrobe leaching, phytoremediation; The collaborative burning method of cement kiln receives the restriction of existing burning facility bigger; Though the chemical reagent extraction method can reclaim resource, working cost is higher, is prone to cause secondary pollution etc.
Summary of the invention
Based on the existing in prior technology problem; The embodiment of the invention provides a kind of system and method for handling sludge containing heavy metal; It is high to solve the sludge treatment cost that has now containing heavy metal, can't satisfy the requirement of landfill after the processing, can cause secondary pollution problem to environment.
The objective of the invention is to realize through following technical proposals:
The embodiment of the invention provides a kind of system that sludge containing heavy metal is handled, and comprising:
Sludge conveyor, mixing reactor, moisture eliminator, mud extraction handling machinery, medicament storage tank, medicament volume pump and emission-control equipment;
Said sludge conveyor is connected with mixing reactor, moisture eliminator and mud extraction handling machinery successively;
The medicament storage tank that is used to store the heavy metal complexing agent storage is connected with the dosing mouth of mixing reactor through the medicament volume pump, can pass through said dosing mouth said heavy metal complexing agent of even sprinkling in mixing reactor;
Said emission-control equipment is connected with the venting port of said moisture eliminator.
The embodiment of the invention also provides a kind of method of handling sludge containing heavy metal, comprising:
Sludge containing heavy metal is delivered in the mixing reactor; Behind the heavy metal complexing agent uniform mixing that adds in the mixing reactor; Make heavy metal ion and heavy metal complexing agent in the mud fully carry out complex reaction, the heavy metal ion in the mud is solidified in the organic complex that forms;
Mud after the complex reaction is transported to carries out drying and other treatment in the moisture eliminator, reduce the moisture of mud and change the proterties of mud, make the mud of exporting after the drying and other treatment satisfy the requirement of landfill through drying and other treatment.
Can find out through technique scheme; Through being organically combined, sludge conveyor, mixing reactor, moisture eliminator, medicament volume pump, mud extraction handling machinery, medicament storage tank and emission-control equipment form the system that can handle sludge containing heavy metal; Make sludge containing heavy metal in the mixing reactor of this system, carry out complex reaction with the heavy metal complexing agent thorough mixing; Heavy metal ion in the mud is solidified in the polymer organic complex that complex reaction forms; And the mud after utilizing moisture eliminator to complex reaction handles, and reduces sludge moisture content and changes sludge character, makes that heavy metal content reaches the landfill requirement in the mud; And its water cut and proterties have all satisfied the requirement of landfill, have realized that innoxious, the stabilization of sludge from wastewater treatment plant, minimizing handle; This system architecture is simple, equipment is few, flexible operation, and processing cost is low, can remove the various heavy metals that contain adaptable across sewage treatment plant dewater sludge.
Description of drawings
The structural representation of the system of the processing sludge containing heavy metal that Fig. 1 provides for the embodiment of the invention one;
The schema of the method for the processing sludge containing heavy metal that Fig. 2 provides for the embodiment of the invention two;
Fig. 3 is the graph of relation of heavy metal content in heavy metal complexing agent dosage and the mud of the embodiment of the invention two;
Each label is among Fig. 1: 1, sludge conveyor; 2, mixing reactor; 3, moisture eliminator; 4, mud extraction handling machinery; 5, medicament volume pump; 6, high-pressure atomization device; 7, emission-control equipment; 8, medicament storage tank; 21, mud inlet; 22, mud mouth; 23, dosing mouth, 31, venting port.
Embodiment
The embodiment of the invention provides a kind of system and method for handling sludge containing heavy metal, and this system is made up of sludge conveyor, mixing reactor, moisture eliminator, mud extraction handling machinery, medicament storage tank, medicament volume pump, high-pressure atomization nozzle and emission-control equipment; This system utilizes the heavy metal in the mud that contains heavy metal of mixing reactor in having realized heavy metal complexing agent and having got into mixing reactor to carry out complex reaction after full and uniform the mixing; And utilize moisture eliminator to realize the reduction of moisture percentage in sewage sludge, the change of proterties to the mud after the complex reaction, handle back mud all satisfies landfill on heavy metal content, water cut and proterties requirement thereby make; This system architecture is simple, equipment is few, flexible operation, and the mud after the processing can satisfy the requirement of landfill, has realized that innoxious, the stabilization of mud, minimizing handle; Can remove each heavy metal species adaptable across sludge from wastewater treatment plant.
For ease of understanding, the present invention is described further below in conjunction with accompanying drawing and specific embodiment.
Embodiment one
Present embodiment provides a kind of system that handles sludge containing heavy metal, and the dewatered sludge that can handle the city domestic sewage treatment plant that contains heavy metal is handled, and makes the mud after the processing satisfy the landfill requirement, and as shown in Figure 1, this system comprises:
Wherein, sludge conveyor 1 is connected with mixing reactor 2, moisture eliminator 3 and mud extraction handling machinery 4 successively;
Emission-control equipment 7 is connected with the venting port of moisture eliminator 3, is used for discharging the waste gas that 3 pairs of sludge drying treating processess of moisture eliminator are discharged, and makes the waste gas qualified discharge after the processing, and moisture eliminator 3 can adopt the rotary kiln type moisture eliminator; Emission-control equipment can adopt the leaching tower.
Sludge conveyor in the said system can adopt does not have the axle spiral conveyer; This nothing axle spiral conveyer is provided with weight sensor; Can monitor the mud weight of advancing that sludge conveyor is transported to the mud in the mixing reactor through weight sensor; And the output terminal of weight sensor is electrically connected with the control end of medicament volume pump; Thereby decide the weight of the heavy metal complex that medicament volume pump 5 adds to mixing reactor by the numerical value that advances mud weight that weight sensor records, be input to the mud weight in the mixing reactor 2 according to sludge conveyor 1, the mode of the weight of the heavy metal complexing agent that control medicament volume pump 5 adds to mixing reactor 2 through this; Guarantee the complex reaction effect; Guaranteed that also the heavy metal complexing agent and the institute mud of handling keep suitable ratio in mixing reactor, make and to utilize this system to have improved processing efficiency to sludge containing heavy metal with the continuous processing of automated manner connection.
Mixing reactor in the said system adopts the corrosion-resistant continous way mixing reactor of processing with the carrying capacity material, and the continous way mixing reactor can adopt any in ploughshare continuous mixing device or the two oar formula continuous mixing device; Side at mixing reactor is provided with mud inlet, and opposite side is provided with mud mouth, and dosing mouth is arranged on the mixing reactor front end, is convenient to the adding of heavy metal complexing agent.
When said system is handled sludge containing heavy metal; Mainly be to make the sludge containing heavy metal that is transported in the mixing reactor, carry out complex reaction after mixing, heavy metal ion is converted into stable, harmless state with heavy metal complexing agent in joining mixing reactor; Reduce the toxicity of heavy metal; Form stable complex compound, heavy metal ion is solidified in the polymer organic complex that forms the most at last, has realized the deactivation function of heavy metal; After mud after the passivation has carried out drying and other treatment in moisture eliminator, reduce water ratio and change proterties, thereby the mud that makes output is in the requirement of all satisfying the mud landfill aspect heavy metal content, water cut and the proterties.
Below in conjunction with to containing the treating processes that heavily belongs to mud, said system is described further:
Certain municipal sewage treatment scale is the sewage work of 50,000 ton per days; Because entering of the trade effluent of upper reaches leather-making enterprises; Make that its water ratio is to contain the total Cr ion of higher toxic heavy metal in 80% the dewatered sludge; Concrete numerical value is the dried mud of 6.1g/kg, in " urban wastewater treatment firm sludge disposal--mix the landfill shale " (CJT 249-2007) standard less than the requirement of the dried mud of 1g/kg.Utilize this system that this water factory's dewatered sludge is handled at present, make it reach the requirement of landfill.
Adopt the system of the embodiment of the invention shown in Figure 1, wherein, heavy metal complexing agent is stored in the soup storage tank 8 of plastics, and the volume of soup storage tank 8 is 1m
3 Medicament volume pump 5 adopts Hydraulic Diaphragm Metering Pump; High-pressure atomization device 6 adopts stainless chemical industry with conical hollow finer atomization nozzle, and that this high-pressure atomization device 6 has is corrosion-resistant, be difficult for advantages such as obstruction, convenience for washing, long service life; The soup spray volume of this high-pressure atomization device 6 is about 50～100L/h, WP 0.1～0.2MPa; Medicament volume pump 5 can evenly be sprayed into heavy metal complexing agent in the mixing reactor with high-pressure atomization device 6 and react; Establish whipping appts in the medicament storage tank 8, prevent heavy metal complexing agent deposition or crystallization;
The heavy metal complexing agent that is adopted in the medicament storage tank is the macromolecule organic that is generated by polyamines and dithiocarbonic anhydride reaction, is in a liquid state; Can with the total Cr ion of poisonous and hazardous heavy metal generation complex reaction in the sewage treatment plant dewater sludge of water ratio 80%, and then form stable complex compound, the total Cr of heavy metal ion solidifies in the polymer organic complex the most at last; Its dosage is the wet mud (water ratio 80%) of 12.5L/t;
During processing; Adopt sludge conveyor 1 that mud is conveyed in the mixing reactor 2; Sludge conveyor 1 adopts the no axle spiral conveyer of band weighing device; Can send in the mixing reactor 2 dewatered sludge is continual, carry the weight of mud to export in real time, because the output terminal of weighing device is associated with the control end of medicament volume pump 5 through weighing device; Can carry the weight control medicament volume pump 5 of mud to add the weight of heavy metal complexing agents according to sludge conveyor 1, make the working order of the numerical value decision medicament volume pump 5 of weighing of sludge conveyor 1; The major function of mixing reactor 2 provides heavy metal in heavy metal complexing agent and the mud and mixes the place with reaction; The ploughshare continuous mixing device that can adopt rotating speed to regulate, mud and the heavy metal complexing agent hybrid reaction time in mixing reactor is 5min;
Reacted mud gets in the moisture eliminator 3, and the major function of moisture eliminator 3 is that mud is carried out drying and other treatment, and moisture percentage in sewage sludge is reduced to below 60% from 75～85%, can carry out the standard of landfill to satisfy mud extraction; Moisture eliminator 3 can adopt the rotary kiln type moisture eliminator, in the mud that moisture eliminator is handled, adds unslaked lime as stablizer, carry out thermopositive reaction and then lower the water ratio of mud, the consumption of lime by processing mud weight 15～25%; The residence time of mud in moisture eliminator 3 is not less than 30min, and the mud extraction of moisture eliminator accounts for 80% below the particle diameter 20mm in pelletized form, and water ratio is less than 60%; Moisture eliminator 3 can discharge waste gas in the drying and other treatment process, ability qualified discharge after need handling through emission-control equipment 7, and emission-control equipment 7 can adopt leaching turriform formula;
The proterties of handling back mud through said system is following: water ratio 54%; Mud extraction prilling, the average 12mm of particle diameter; The total Cr ion of mud extraction (detection method-" sludge from wastewater treatment plant detection method " (CJ/T211-2005)) content is the 0.76g/kg dewatered sludge; Therefrom can find out; Through this system handles, can total chrome content in the mud be reduced to the 0.76g/kg dewatered sludge from the 6.1g/kg dewatered sludge, curing efficiency is about 87.5%; Guarantee that mud extraction can satisfy the standard of mud mixing landfill, alleviated of the harm of the total chromium of heavy metal greatly environment.
Embodiment two
Present embodiment provides a kind of method of handling sludge containing heavy metal; The dewatered sludge that can handle the city domestic sewage treatment plant that contains heavy metal is handled; Make the mud after the processing satisfy the landfill requirement; The system that can adopt the foregoing description one to provide realizes this method, and idiographic flow is as shown in Figure 2, comprising:
With sludge conveyor sludge containing heavy metal is transported in the mixing reactor; Heavy metal complexing agent evenly is sprayed onto in the mixing reactor in the handled mud with the high-pressure fog mode through the high-pressure atomization device through the medicament volume pump; Make both even thorough mixing; Heavy metal ion in the mud and heavy metal complexing agent carry out complex reaction, and the heavy metal ion in the mud is solidified in the organic complex that complex reaction forms; The heavy metal complexing agent that adds in the mixing reactor can adopt liquid macromolecule organic; Can with poisonous and hazardous heavy metal ion generation complex reaction in the mud of water ratio 75～85%; Its branched monomer can form stable list of coordination units (even if carry out concentrated acid alkali clear up to make cooperated stable heavy metal ion to dissociate out) with heavy metal ion; And then form stable complex compound; Heavy metal ion is solidified in the polymer organic complex the most at last, and the time of complex reaction generally is not less than 5 minutes;
In the reality; Used heavy metal complexing agent can be selected according to the difference of contained heavy metal in the mud; As long as this heavy metal complexing agent can form the organic complex that solidifies contained heavy metal ion with contained heavy metal generation complex reaction in the mud, is that monomer synthetic heavy metal complexing agent can have complexing effect preferably to cupric ion and the nickel ion (in the electroplating wastewater) that contains in the mud like quadrol; As to mix polyamines be that monomer synthesizing heavy metal complexing agent can have complexing effect preferably to the chromium in the mud (leather-making waste water); Heavy metal complexing agent can constitute monomeric proportioning of this heavy metal complexing agent and reaction conditions acquisition through adjustment;
The consumption of heavy metal complexing agent can be selected with reference to the sludge containing heavy metal gross weight that is transported in the mixing reactor; The dosage of general heavy metal complexing agent adds (wherein in the wet mud that contains heavy metal by 5～100L/t; The L/t of unit of heavy metal complexing agent dosage representes the heavy metal complexing agent that wet mud per ton adds 5～100 liters); With the present embodiment is example, and the heavy metal chromium of being handled in the mud is as shown in Figure 3 with heavy metal complexing agent dosage change curve.
Mud after the complex reaction is conveyed into carries out drying and other treatment in the moisture eliminator; Reduce the moisture of mud and change the proterties of mud through drying and other treatment; Moisture percentage in sewage sludge is reduced to below 60% from 75～85%; Mud extraction prilling, particle diameter average out to 12～20mm, the mud of the output after the moisture eliminator drying and other treatment satisfies the requirement of landfill.
In the aforesaid method, the mud after the complex reaction is conveyed into carries out drying and other treatment in the moisture eliminator and specifically can adopt:
In moisture eliminator, add lime as stablizer, the add-on of lime is to be transported to 15～25% of the interior mud gross weight of moisture eliminator; The drying time of mud in moisture eliminator is not less than 30 minutes;
Perhaps, adopt the direct mummification of hot steam.
Also can adopt both blended drying and other treatment technology,
In sum; Spray in the sludge containing heavy metal in the mixing reactor through high-pressure atomization through the heavy metal complexing agent that complex reaction will can take place with the heavy metal in the handled mud in the embodiment of the invention; Carry out complex reaction behind the thorough mixing; After heavy metal in the mud is converted into stable, harmless state; Again with mud through carrying out drying and other treatment in the moisture eliminator, make mud extraction satisfy the requirement of sanitary landfill, realized that innoxious, stabilization, the minimizing to the sludge from wastewater treatment plant that contains heavy metal handled; Being specially adapted to the municipal wastewater is that the dewatered sludge of the municipal sanitary sewage disposal factory that gets into of trade effluent main, that have part to contain heavy metal is simultaneously again handled, and makes mud after the processing satisfy the requirement of mud hygienic safety landfill.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (9)
1. a system that handles sludge containing heavy metal is characterized in that, comprising:
Sludge conveyor (1), mixing reactor (2), moisture eliminator (3), mud extraction handling machinery (4), medicament storage tank (8), medicament volume pump (5) and emission-control equipment (7);
Said sludge conveyor (1) is connected with mixing reactor (2), moisture eliminator (3) and mud extraction handling machinery (4) successively;
The medicament storage tank (8) that is used to store the heavy metal complexing agent storage is connected through the dosing mouth of medicament volume pump (5) with mixing reactor (2), can pass through said dosing mouth said heavy metal complexing agent of even sprinkling in mixing reactor (2);
Said emission-control equipment (7) is connected with the venting port of said moisture eliminator (3);
Said sludge conveyor adopts does not have the axle spiral conveyer, and this nothing axle spiral conveyer is provided with the weight sensor that monitoring gets into mud weight, and the output terminal of weight sensor is connected with the control end of said medicament volume pump (5).
2. the system of processing sludge containing heavy metal as claimed in claim 1; It is characterized in that; Said mixing reactor adopts the corrosion-resistant continous way mixing reactor of processing with the carrying capacity material, and said continous way mixing reactor adopts any in ploughshare continuous mixing device or the two oar formula continuous mixing device.
3. according to claim 1 or claim 2 the system of processing sludge containing heavy metal is characterized in that a side of said mixing reactor is provided with mud inlet, and opposite side is provided with mud mouth, and dosing mouth is arranged on the mixing reactor front end.
4. the system of processing sludge containing heavy metal as claimed in claim 1 is characterized in that, said medicament volume pump adopts Hydraulic Diaphragm Metering Pump;
Said medicament storage tank adopts corrosion resistant plastics pot or stainless cylinder of steel, is provided with whipping appts in the medicament storage tank.
5. the system of processing sludge containing heavy metal as claimed in claim 1; It is characterized in that; Said system also comprises: high-pressure atomization device (6); The mouth spray of this high-pressure atomization device (6) is connected with the dosing mouth of mixing reactor, and medicament volume pump (5) is connected with the fluid inlet of this high-pressure atomization device (6); The WP of this high-pressure atomization device (6) is 0.1～0.2MPa, and spouting liquid is 50～100L/h.
6. the system of processing sludge containing heavy metal as claimed in claim 1 is characterized in that, said moisture eliminator adopts the rotary kiln type moisture eliminator;
Said emission-control equipment adopts the leaching tower.
7. method that adopts the said system handles sludge containing heavy metal of claim 1 is characterized in that: comprising:
Sludge containing heavy metal is delivered in the mixing reactor; Behind the heavy metal complexing agent uniform mixing that adds in the mixing reactor; Make heavy metal ion and heavy metal complexing agent in the mud fully carry out complex reaction, the heavy metal ion in the mud is solidified in the organic complex that forms;
Mud after the complex reaction is transported to carries out drying and other treatment in the moisture eliminator, reduce the moisture of mud and change the proterties of mud, make the mud of exporting after the drying and other treatment satisfy the requirement of landfill through drying and other treatment.
8. the method for processing sludge containing heavy metal as claimed in claim 7 is characterized in that, in the said method, the consumption that adds the heavy metal complexing agent in the mixing reactor to is for adding 5～100L in the wet mud that contains heavy metal by per ton in mixing reactor; The time of complex reaction is not less than 5 minutes.
9. the method for processing sludge containing heavy metal as claimed in claim 7 is characterized in that, said mud after the complex reaction is transported to carried out drying and other treatment and comprised in the moisture eliminator:
In moisture eliminator, add lime as stablizer, the add-on of lime is to be transported to 15～25% of the interior mud gross weight of moisture eliminator; The drying time of mud in moisture eliminator is not less than 30 minutes;
Perhaps, adopt the direct mummification of hot steam.
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| CN102241464B (en) * | 2011-06-01 | 2013-06-12 | 北京中持绿色能源环境技术有限公司 | Urban sludge treating method and equipment |
| CN103524012B (en) * | 2013-10-09 | 2015-12-02 | 福建清道夫环保科技有限公司 | Shaftless screw is supplied gas double stock stop |
| CN104876408B (en) * | 2015-05-27 | 2017-09-01 | 青海师范大学 | Method for sludge treatment, system |
| CN106477834B (en) * | 2016-11-23 | 2024-06-14 | 上海市政工程设计研究总院（集团）有限公司 | Treatment equipment and technology for repairing simple landfill old sludge soil |
| CN106807028A (en) * | 2016-12-05 | 2017-06-09 | 中海油能源发展股份有限公司北京安全环保工程技术研究院 | A kind of oil-based drill cuttings oxidation and stabilization processes device and method |
| CN108083433A (en) * | 2017-12-29 | 2018-05-29 | 浩蓝环保股份有限公司 | A kind of automatic sludge returning anaerobic reactor |
| CN108609833B (en) * | 2018-07-26 | 2023-10-27 | 大成科创基础建设股份有限公司 | High-water-content sludge and slurry rapid dehydration and solidification device |
| CN113185087A (en) * | 2021-05-20 | 2021-07-30 | 济南中合环保科技有限公司 | Sludge treatment method and system |
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| JPS551831A (en) * | 1978-06-19 | 1980-01-09 | Kirin Brewery Co Ltd | Excess sludge treating method |
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| CN101497942A (en) * | 2009-03-11 | 2009-08-05 | 南京农业大学 | Biological leaching-solvent extraction-electrodeposition recovering method for heavy metal copper in sludge |
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Effective date of registration: 20140120 Address after: 100192, Beijing, Haidian District, 66 small West Road, Zhongguancun Dongsheng science and Technology Park (North Territory) D District, building 2, 4 floor Patentee after: China holding (Beijing) water operation Co., Ltd. Address before: 100088 Beijing City, Haidian District Zhichun Road Jinqiu International Building No. 6 B block 1602 Patentee before: Beijing Zhongchi Green Energy Environmental Technology Co., Ltd. Patentee before: CSD (Beijing) Environmental Protection Development Co., Ltd. |
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| C56 | Change in the name or address of the patentee |
Owner name: ZHONGCHI WATER CO., LTD. Free format text: FORMER NAME: CSD (BEIJING) WATER WORKS OPERATION MANAGEMENT CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 100192, Beijing, Haidian District, 66 small West Road, Zhongguancun Dongsheng science and Technology Park (North Territory) D District, building 2, 4 floor Patentee after: CSD WATER SERVICE CO., LTD. Address before: 100192, Beijing, Haidian District, 66 small West Road, Zhongguancun Dongsheng science and Technology Park (North Territory) D District, building 2, 4 floor Patentee before: China holding (Beijing) water operation Co., Ltd. |