CN202124518U - Multistage downflow bioaeration filter - Google Patents
Multistage downflow bioaeration filter Download PDFInfo
- Publication number
- CN202124518U CN202124518U CN2011202190248U CN201120219024U CN202124518U CN 202124518 U CN202124518 U CN 202124518U CN 2011202190248 U CN2011202190248 U CN 2011202190248U CN 201120219024 U CN201120219024 U CN 201120219024U CN 202124518 U CN202124518 U CN 202124518U
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- Prior art keywords
- filter
- backwash
- biological aerated
- aerated filter
- water
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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
Abstract
The utility model discloses a multistage downflow bioaeration filter which comprises a collecting basin and a lift pump, wherein sewage enters the multistage downflow bioaeration filter by disposable pressurization lifting; the sewage contacts with filter materials and a biomembrane; meanwhile, an air blower or system wind supplies oxygen; water quality is purified by the adsorption interception of the filter materials and the biomembrane, food chain grading predation and oxygenolysis formed along current direction as well as the filtering action of a filter material layer; the purified water flows to a water discharging slot by a filter water discharging path after passing through a filter head fixed on a filter plate; water discharging slot overflowing water enters a second stage of bioaeration filter; sewage entering the second stage of bioaeration filter is processed by repeating the previous stage of processing process; and the rest can be done in the same manner. When the multistage downflow bioaeration filter disclosed by the utility model is used for further processing second grade of biochemical effluent of sewage treatment plants, the COD (Chemical Oxygen Demand) cr strainaway rate can be above 50%, and the NH3-N strainaway rate reaches 60%.
Description
Technical field
The utility model relates to a kind of multistage to dirty biological aerated filter, mainly is applicable to WWT, belongs to plumbing technological design field.
Background technology
Biological aerated filter (Biological Aerated Filter is called for short BAF) is a kind of high loading submerged fixed bed phase reactor, and filtering technique and contact oxidation method are organically combined, and realizes that through back flushing regeneration the cycle in filter tank substitutes.The principal feature of biological aerated filter is to adopt the less granulated material of particle diameter as filtrate, and filtrate is immersed in the water, utilizes the blast aeration oxygen supply.Filter material layer plays two aspects: the one, as microorganism carrier; The denitrification function that food chain classification predation that filler and biomembranous absorption holds back, form along water (flow) direction and oxygenolysis and the inner microenvironment of microbial film are possessed makes purification of water quality more thorough; The 2nd, can be used as filtration medium, hold back suspended solids and the new biosolids that forms in the water into.Biological aerated filter can be used as the biological sewage treatment of various objectives, and the two stage biological that can be used as sewage is handled, and use and remove SS, COD, the BOD in the sewage, or further nitrated removal ammonia nitrogen; As three grades of biological treatments of sewage, mainly be nitrated, and further advanced treatment is removed organism and suspended solids in the sewage with the removal ammonia nitrogen.The structure and the conventional rapid filter of BAF are basic identical, and difference is that BAF bottom or bottom have increased aerating system.
Biological aerated filter adopts robotization control, is easy to management.
Biological aerated filter can be divided into upward flow and following to two kinds of streams according to water (flow) direction.Can be divided under single-stage upward flow and the single-stage to stream biological aerated filter, series connection biological aerated filter, two sections biological aerated filters of one-level, turn back stream biological aerated filter, alternative expression BAF, pre-denitrification and denitrogenation biological filter and water conservancy diversion BAF etc. according to the process combination form.
The utility model content
It is a kind of multistage to dirty biological aerated filter that the purpose of the utility model is to provide; Adopt this multistage to the treatment plant's secondary biochemical water outlet of disposing of sewage of dirty biological aerated filter; Can make the dissolved oxygen in the biological aerated filter water be controlled at 3～5mg/l, the CODcr clearance can reach more than 50%, NH
3-N clearance reaches 60%.
The utility model adopts following technical scheme:
A kind of multistage to dirty biological aerated filter, it is characterized in that: comprise that water collecting basin (A) and some levels are to dirty biological aerated filter (C); Every grade of biological aerated filter is made up of inlet and outlet system, biological filter, aerating system and back-purge system four parts; Wherein:
Described inlet and outlet system is made up of lift pump (B), water inlet pneumavalve (1) and inlet flume (7) and effluent trough (9); Inlet flume (7) and effluent trough (9) lay respectively at the both sides of said biological filter; Water collecting basin (A) is connected with lift pump (B), and lift pump (B) is connected with the inlet flume of first step biological aerated filter through water inlet pneumavalve (1);
Described biological filter comprises the pond body, and body inside, pond is provided with filter material layer (11), supporting layer (14), filter plate (15) and water exit (17) from top to bottom successively; Filter plate (15) is provided with filter (16), and water exit (17) communicates with the effluent trough of biological aerated filter at the corresponding levels;
Described aerating system is responsible for (12) by aeration valve (2), aeration and some arms (13) are formed; Aeration valve (2) is used to regulate single-stage biological aerated filter air input size; The aeration person in charge (12) and some arms (13) are located at the bottom of filter material layer (11); And aeration is responsible for (12) and is connected with some arms (13) through flange, and arm (13) is a boring aeration pipe;
Described back-purge system comprises backwash air inlet pneumavalve (3), backwash water inlet pneumavalve (5), backwash draining pneumavalve (6), backwash sk-(8) and backwash induction trunk (19); Backwash sk-(8) and backwash induction trunk (19) are conjoined structure up and down; And it is adjacent with inlet flume; Backwash sk-(8) equates with the cross-sectional area of backwash induction trunk (19); Backwash draining pneumavalve (6) is installed in the bottom of backwash sk-(8); Backwash air inlet pneumavalve (3) is connected with backwash induction trunk (19), and backwash induction trunk (19) is connected with water exit (17) through pore (20), and backwash water inlet pneumavalve (5) is connected in through pipeline between the effluent trough of effluent trough and next stage of upper level biological aerated filter.
Preferable, the effluent trough of upper level biological aerated filter is the inlet flume of next stage biological aerated filter simultaneously.
Preferable, the effluent trough of said every grade of biological aerated filter and operation liquid level absolute altitude thereof successively decrease by 0.5m successively.
Preferable, the particle diameter of filter medium of filling varies in size in the filter material layer of said every grade of biological aerated filter, and the particle diameter of filter medium of filling is greater than the particle diameter of other filtrates that load at different levels in the filter material layer of first step biological aerated filter.
Preferable, the filtrate height of filling successively decreases by 0.5m successively in the filter material layer of said every grade of biological aerated filter.
Preferable, the length of said every grade of biological aerated filter is 1.4: 1～1.6: 1 with wide ratio.
The principle of work of the utility model is: sewage is got in the water collecting basin; Promote entering first step biological aerated filter through the disposable pressurization of lift pump; Sewage contacts with filtrate and microbial film; Utilize gas blower or system's wind oxygen supply simultaneously, the food chain classification predation of holding back, forming along water (flow) direction through filtrate and biomembranous absorption and the filteration of oxygenolysis and filter material layer reach the purpose that purifies water.First step biological aerated filter sewage is behind certain hydraulic detention time, and the water after the purification is through being fixed on the filter on the filter plate, and water exit flow to effluent trough through the biological filter again, and effluent trough overflows water and gets into second stage biological aerated filter.The sewage that gets into second stage biological aerated filter repeats the treating processes of upper level, by that analogy.
When carrying out back flushing; Open backwash air inlet pneumavalve, pressurized air is through the water exit of bottom, pore entering biological filter, and filter tank water inlet simultaneously is directly switch into effluent trough through backwash water pipeline and pneumavalve with water inlet; Get into the water exit of aqueous reflux to the biological filter of effluent trough; The G&W that gets into water exit all gets into the filter tank through filter filter material layer is carried out back flushing, and the back flushing water outlet flows into the backwash sk-certainly, and then opens the draining of backwash draining pneumavalve.
The beneficial effect of the utility model is: in actual use; Can confirm the sum of series total hrt of biological aerated filter according to different processes position and sewage quality; That adopts that the utility model provided is above-mentioned multistage to the treatment plant's secondary biochemical water outlet of further disposing of sewage of dirty biological aerated filter; Can make the dissolved oxygen in the biological aerated filter water be controlled at 3～5mg/l, the CODcr clearance can reach more than 50%, NH
3-N clearance reaches 60%.
Description of drawings
Fig. 1 is that the utility model is a kind of to dirty multi-stage biological aerating filter plat;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is the B-B sectional view of Fig. 1;
Fig. 4 is the C-C sectional view of Fig. 1.
Among the figure: A is a water collecting basin, and B is a lift pump, and C is multistage to dirty BAF; The 1-pneumavalve of intaking, 2-aeration valve, 3-backwash air inlet pneumavalve, 4-backwash air inlet manual valve, 5-backwash water inlet pneumavalve; 6-backwash draining pneumavalve, 7-inlet flume, 8-sk-, 9-effluent trough, 10-filter screen; The 11-filter material layer, the 12-aeration is responsible for, 13-arm, 14-supporting layer, 15-filter plate; The 16-filter, 17-water exit, the import of 18-backwash gas, 19-backwash induction trunk, 20-pore.
Embodiment
Further set forth the utility model below in conjunction with specific embodiment, should be understood that these embodiment only be used to the utility model is described and be not used in the restriction the utility model protection domain.
Like Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, present embodiment designs for sewerage advanced treatment process, and the designing treatment water yield is 75m
3/ h; This instance comprises that water collecting basin A and lift pump B and one group are multistage to dirty biological aerated filter C; Saidly multistagely constitute to dirty biological aerated filter by three grades to dirty biological aerated filter C; Every grade of filter tank length is L/B=1.4 with wide ratio, and upper level and next stage biological aerated filter filtrate are loaded by the absolute altitude 0.5m combination of successively decreasing, and every grade of inlet flume 7, effluent trough 9 or its operation liquid level are equally by the 0.5m design of successively decreasing; Every grade of biological aerated filter is made up of inlet and outlet system, biological filter, aerating system and back-purge system four parts.
Said inlet and outlet system is made up of institutes such as inlet water lifting pumps B, water inlet pneumavalve 1, inlet flume 7, effluent trough 9 and Inlet and outlet water pipelines; The first step is sent the sewage among the water collecting basin A into the filter tank by lift pump B; Said turnover tank 7 or effluent trough 9 are to keep certain rectangular parallelepiped pond of crossing water space between an open upper end, the both sides pool wall; The inlet flume 7 of this one-level also is the effluent trough 9 of upper level simultaneously, and this instance inlet flume 7 or effluent trough 9 cross-sectional dimension are 5000 * 220mm.
Said biological filter is made up of filter material layer 11, supporting layer 14, filter plate 15, filter 16 and water exit institute 17; Said filter material layer 11 is meant that growth is perched, bred in the mikrobe set in the biological filter; And suspended substance in dirty (giving up) water had the carrier that physics is held back filteration, in bio-aeration and filtration procedure, to the main aseptic of water pollutant; First step filling ceramic grain filter diameter is 5～8mm in this instance filter tank; Loading height is 3m, and second and third grade filling ceramic grain filter diameter is respectively 4～6mm and 3～5mm, and every grade of biological aerated filter filtrate loading height successively decreases by 0.5m; Said supporting layer 14 is meant to preventing from water distribution system, the run off bed course of the filtrate that is provided with of filtrate; A certain amount of gravel of filling below filtrate; The particle diameter of this instance gravel is 6～8mm; Supporting layer 14 loading heights are 300mm, and said filter 16 is meant to be installed in and is used for normal water distribution, back flushing water distribution, a kind of water distribution of back flushing distribution, distribution device on the support filter plate of biological aerated filter middle and lower part; Strainer head 16 interior diameters of selecting for use are 25mm, and L=330mm, perforated area are 350mm
2Said filter plate 15 is meant fixing special-purpose filter and carries filtrate; Supporting plate with certain loading strength and horizontal accuracy requirement; The filter plate specification is 1100*1100*100mm; Said water exit 17 is meant to dirty biological aerated filter crosses aquaporin, also is back flushing air inlet or water entry simultaneously, and this instance water exit height is 0.5m.
Said aerating system is made up of aeration valve 2, the aeration person in charge 12 and some 13 of arms.Said aeration valve 2 is meant the valve of single-stage biological aerated filter adjusting air input size; Said aeration is responsible for 12 and is meant that with some arms 13 the aeration person in charge 12 who gets into every grade of filter tank filter material layer 11 bottoms is connected with some arms 13 through flange; Arm 13 is a boring aeration pipe; Be evenly distributed on the same horizontal plane in bottom, pond along the person in charge; Every arm tiltedly below 45 ° of directions be symmetrical set the perforate of some amount by certain spacing, this instance opening diameter is 4mm, single pond boring aeration pipe percentage of open area is 60%.
Said back-purge system is made up of backwash air inlet pneumavalve 3, backwash air inlet manual valve 4, backwash water inlet pneumavalve 5, backwash draining pneumavalve 6, backwash sk-8 and 19 of induction trunks; Said backwash sk-8 with backwash induction trunk 19 be about conjoined structure; And it is adjacent with inlet flume; Backwash sk-8 cross-sectional dimension are 5000 * 310mm, and backwash sk-8 equates with the induction trunk cross-sectional area, induction trunk 19 highly be about the pond high 1/4; Back flushing draining pneumavalve is installed in the position of the bottom of sk-; Backwash air inlet pneumavalve 3 is connected with back flushing induction trunk 19, and back flushing induction trunk 19 communicates with filter tank water exit 17 through pore 20, and it is that DN50250 arranges that this instance is provided with pore for every grade.Backwash water inlet pneumavalve 5 is connected in through pipeline between the effluent trough of effluent trough and next stage of upper level biological aerated filter
Present embodiment is a kind of multistage to the operation of dirty biological aerated filter employing automatic control mode.
When present embodiment normally moves; The water outlet pneumavalve 1 of lift pump B is in full-gear; Through regulating the manual valve control pump water flow of pump discharge, sewage leans on run by gravity finally to flow to effluent trough 9 through one, two, three biological filter and water exit at different levels 17 successively.Sewage is opened biological aerated filter aeration valves 2 at different levels simultaneously in biochemical reactions at different levels and filtration procedure, and according to processing requirement control aeration rate at different levels.
Backwash operation automatic control step is seen table 1.
The automatic controlled step of table 1 backwash operation
Above-mentioned three grades that present embodiment designed is 160m to dirty biological aerated filter useful volume
3, the design air amount is 8m
3/ min, hydraulic detention time are 2.5h, and volumetric loading is respectively 0.90kgCODcr/ (m
3D) and 0.20kgNH
3-N/ (m
3D).Present embodiment designs as sewerage advanced treatment process, and the COD clearance reaches about 55%, NH
3-N clearance reaches about 60%.
Claims (6)
- One kind multistage to dirty biological aerated filter, it is characterized in that: comprise that water collecting basin (A) and some levels are to dirty biological aerated filter (C); Every grade of biological aerated filter is made up of inlet and outlet system, biological filter, aerating system and back-purge system four parts; Wherein:Described inlet and outlet system is made up of lift pump (B), water inlet pneumavalve (1) and inlet flume (7) and effluent trough (9); Inlet flume (7) and effluent trough (9) lay respectively at the both sides of said biological filter; Water collecting basin (A) is connected with lift pump (B), and lift pump (B) is connected with the inlet flume of first step biological aerated filter through water inlet pneumavalve (1);Described biological filter comprises the pond body, and body inside, pond is provided with filter material layer (11), supporting layer (14), filter plate (15) and water exit (17) from top to bottom successively; Filter plate (15) is provided with filter (16), and water exit (17) communicates with the effluent trough of biological aerated filter at the corresponding levels;Described aerating system is responsible for (12) by aeration valve (2), aeration and some arms (13) are formed; Aeration valve (2) is used to regulate single-stage biological aerated filter air input size; The aeration person in charge (12) and some arms (13) are located at the bottom of filter material layer (11); And aeration is responsible for (12) and is connected with some arms (13) through flange, and arm (13) is a boring aeration pipe;Described back-purge system comprises backwash air inlet pneumavalve (3), backwash water inlet pneumavalve (5), backwash draining pneumavalve (6), backwash sk-(8) and backwash induction trunk (19); Backwash sk-(8) and backwash induction trunk (19) are conjoined structure up and down; And it is adjacent with inlet flume; Backwash sk-(8) equates with the cross-sectional area of backwash induction trunk (19); Backwash draining pneumavalve (6) is installed in the bottom of backwash sk-(8); Backwash air inlet pneumavalve (3) is connected with backwash induction trunk (19), and backwash induction trunk (19) is connected with water exit (17) through pore (20), and backwash water inlet pneumavalve (5) is connected in through pipeline between the effluent trough of effluent trough and next stage of upper level biological aerated filter.
- 2. as claimed in claim 1 multistage to dirty biological aerated filter, it is characterized in that: the effluent trough of upper level biological aerated filter is the inlet flume of next stage biological aerated filter simultaneously.
- 3. as claimed in claim 2 multistage to dirty biological aerated filter, it is characterized in that: the effluent trough of said every grade of biological aerated filter and operation liquid level absolute altitude thereof successively decrease by 0.5m successively.
- 4. as claimed in claim 1 multistage to dirty biological aerated filter; It is characterized in that: the particle diameter of filter medium of filling varies in size in the filter material layer of said every grade of biological aerated filter, and the particle diameter of filter medium of filling is greater than other particle diameter of filter medium that load at different levels in the filter material layer of first step biological aerated filter.
- 5. like claim 1 or 4 described multistage to dirty biological aerated filter, it is characterized in that: the filtrate height of filling successively decreases by 0.5m successively in the filter material layer of said every grade of biological aerated filter.
- 6. as arbitrary described multistage to dirty biological aerated filter among the claim 1-4, it is characterized in that: the length of said every grade of biological aerated filter is 1.4: 1～1.6: 1 with wide ratio.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202190248U CN202124518U (en) | 2011-06-24 | 2011-06-24 | Multistage downflow bioaeration filter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202190248U CN202124518U (en) | 2011-06-24 | 2011-06-24 | Multistage downflow bioaeration filter |
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| CN202124518U true CN202124518U (en) | 2012-01-25 |
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| CN2011202190248U Expired - Lifetime CN202124518U (en) | 2011-06-24 | 2011-06-24 | Multistage downflow bioaeration filter |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674534A (en) * | 2012-05-25 | 2012-09-19 | 复旦大学 | Falling water aeration biofilter for sewage treatment |
| CN103055555A (en) * | 2013-01-08 | 2013-04-24 | 霍祥明 | Air distribution system of filter |
| CN103508626A (en) * | 2013-08-23 | 2014-01-15 | 福建省农业科学院农业工程技术研究所 | Sewage purifier and application method thereof |
| CN103803667A (en) * | 2014-02-28 | 2014-05-21 | 环境保护部南京环境科学研究所 | Two-stage desert sand filter and wastewater treatment method thereof |
| CN104150621A (en) * | 2014-08-27 | 2014-11-19 | 苏州清然环保科技有限公司 | Pneumatic liquid level lifting device |
| CN105347467A (en) * | 2015-12-01 | 2016-02-24 | 浙江海牛环境科技股份有限公司 | Sewage treatment system of semi-fluidization biological aerated filter of static bed |
| CN108033549A (en) * | 2017-11-08 | 2018-05-15 | 刘顺 | A kind of barrier type biological aerated filter |
| CN108996850A (en) * | 2018-09-11 | 2018-12-14 | 安徽亚泰环境工程技术有限公司 | A kind of multidirectional stream biofiltration device |
| CN109205769A (en) * | 2017-06-30 | 2019-01-15 | 江苏天地化纤有限公司 | A kind of biological aerated filter |
-
2011
- 2011-06-24 CN CN2011202190248U patent/CN202124518U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674534A (en) * | 2012-05-25 | 2012-09-19 | 复旦大学 | Falling water aeration biofilter for sewage treatment |
| CN103055555A (en) * | 2013-01-08 | 2013-04-24 | 霍祥明 | Air distribution system of filter |
| CN103508626A (en) * | 2013-08-23 | 2014-01-15 | 福建省农业科学院农业工程技术研究所 | Sewage purifier and application method thereof |
| CN103803667B (en) * | 2014-02-28 | 2016-01-27 | 环境保护部南京环境科学研究所 | The unconcerned sand filter of a kind of two-stage and method of wastewater treatment thereof |
| CN103803667A (en) * | 2014-02-28 | 2014-05-21 | 环境保护部南京环境科学研究所 | Two-stage desert sand filter and wastewater treatment method thereof |
| CN104150621A (en) * | 2014-08-27 | 2014-11-19 | 苏州清然环保科技有限公司 | Pneumatic liquid level lifting device |
| CN104150621B (en) * | 2014-08-27 | 2015-11-18 | 苏州清然环保科技有限公司 | Pneumatic liquid level lifting gear |
| CN105347467A (en) * | 2015-12-01 | 2016-02-24 | 浙江海牛环境科技股份有限公司 | Sewage treatment system of semi-fluidization biological aerated filter of static bed |
| CN105347467B (en) * | 2015-12-01 | 2018-05-25 | 浙江海牛环境科技股份有限公司 | A kind of fixed bed partly fluidizes aerating biological filter sewage processing system |
| CN109205769A (en) * | 2017-06-30 | 2019-01-15 | 江苏天地化纤有限公司 | A kind of biological aerated filter |
| CN108033549A (en) * | 2017-11-08 | 2018-05-15 | 刘顺 | A kind of barrier type biological aerated filter |
| CN108996850A (en) * | 2018-09-11 | 2018-12-14 | 安徽亚泰环境工程技术有限公司 | A kind of multidirectional stream biofiltration device |
| CN108996850B (en) * | 2018-09-11 | 2023-11-07 | 安徽亚泰环境工程技术有限公司 | Multidirectional flow biological filter device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHANGHAI ZHONGXIN WATER INDUSTRY CO., LTD. Free format text: FORMER NAME: SHANGHAI YATONG ENVIRONMENTAL PROTECTION INDUSTRIAL CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 200092, room 1121, No. two, 801 North Road, Zhongshan, Shanghai, Yangpu District Patentee after: SHANGHAI CITIC WATER INDUSTRY CO., LTD. Address before: 200092, room 1121, No. two, 801 North Road, Zhongshan, Shanghai, Yangpu District Patentee before: Shanghai Yatong Environmental Protection Industrial Co., Ltd. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20181206 Address after: 101199 7th Floor 701, No. 2 Building, 60 Xinhua West Street, Tongzhou District, Beijing Patentee after: Trust Water Environment Investment Company Limited Address before: Room 801, 1121 Zhongshan North Second Road, Yangpu District, Shanghai, 200092 Patentee before: SHANGHAI CITIC WATER INDUSTRY CO., LTD. |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200710 Address after: Room B405, standard workshop auxiliary room, Jinyang science and Technology Industrial Park, Guiyang National High tech Industrial Development Zone, Guiyang City, Guizhou Province Patentee after: GUIZHOU ZHUXIN WATER AFFAIRS ENVIRONMENT INDUSTRY Co.,Ltd. Address before: 101199 7th Floor 701, No. 2 Building, 60 Xinhua West Street, Tongzhou District, Beijing Patentee before: XINKAI WATER ENVIRONMENT INVESTMENT Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20120125 |
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| CX01 | Expiry of patent term |