CN108726819B - Device for purifying black and odorous water body of river channel - Google Patents
Device for purifying black and odorous water body of river channel Download PDFInfo
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- CN108726819B CN108726819B CN201810918146.2A CN201810918146A CN108726819B CN 108726819 B CN108726819 B CN 108726819B CN 201810918146 A CN201810918146 A CN 201810918146A CN 108726819 B CN108726819 B CN 108726819B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- 239000000945 filler Substances 0.000 claims abstract description 22
- 244000005700 microbiome Species 0.000 claims abstract description 18
- 238000004062 sedimentation Methods 0.000 claims abstract description 16
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 9
- 230000000694 effects Effects 0.000 claims abstract description 6
- 238000011049 filling Methods 0.000 claims abstract description 6
- 238000005273 aeration Methods 0.000 claims description 23
- 238000005192 partition Methods 0.000 claims description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 229920002635 polyurethane Polymers 0.000 claims description 6
- 239000004814 polyurethane Substances 0.000 claims description 6
- 241000193830 Bacillus <bacterium> Species 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 241000235342 Saccharomycetes Species 0.000 claims description 2
- 230000033116 oxidation-reduction process Effects 0.000 claims description 2
- 230000000813 microbial effect Effects 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 4
- 150000001722 carbon compounds Chemical class 0.000 abstract description 2
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 238000006731 degradation reaction Methods 0.000 abstract description 2
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 239000010865 sewage Substances 0.000 description 8
- 239000010802 sludge Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 102000004190 Enzymes Human genes 0.000 description 2
- 108090000790 Enzymes Proteins 0.000 description 2
- 239000003651 drinking water Substances 0.000 description 2
- 235000020188 drinking water Nutrition 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 240000004808 Saccharomyces cerevisiae Species 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000011066 ex-situ storage Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/007—Contaminated open waterways, rivers, lakes or ponds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/16—Total nitrogen (tkN-N)
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/02—Odour removal or prevention of malodour
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
- Activated Sludge Processes (AREA)
Abstract
The invention solves the defects of large investment and large occupied area in the ectopic repairing technology in the prior art. The device for purifying the black and odorous water body of the river comprises a cavity, a water inlet area, a biological reaction area, a sedimentation area and a water outlet area, wherein the water inlet area, the biological reaction area, the sedimentation area and the water outlet area are communicated in the vertical direction in the cavity, a mud bucket is arranged at the bottom of the water inlet area, a mud pipe is connected with the bottom of the mud bucket, and the biological reaction area is filled with filler and microorganism strains. The technical effect of the technical scheme is as follows: can efficiently degrade ammonia nitrogen, total nitrogen, low carbon compounds and decompose macromolecular organic matters, and has small investment and small occupied area; by filling the high molecular filler, the attachment quantity of microorganism strains can be improved, and the degradation efficiency is enhanced.
Description
Technical Field
The invention relates to environment-friendly equipment for sewage treatment, in particular to an environment-friendly device for efficiently treating black and odorous water body by integrating a bioreactor and precipitation.
Background
The urban river is used as an important component of the urban ecological system, has the functions of supplying water sources, providing green lands, improving the environment, transporting, cultural education, travelling and entertainment and the like, and has important significance for ecological construction of cities.
At present, the national water pollution phenomenon is serious, and the water quality of the water body is worsened. There are 1200 or more rivers monitored nationwide, 850 of which are contaminated to varying degrees, and there is a tendency to become increasingly severe. In the seven-big water system, the river reach unsuitable for drinking water source reaches 40%, the pollution of the urban river reach with developed industry is prominent, and 78% of the river reach is unsuitable for drinking water source. The pollution index of the river channel is that organic matters such as ammonia nitrogen, five-day biochemical oxygen demand and the like exceed the self-cleaning capacity of the river channel.
When a large amount of organic pollutants exist in the water body, the pollutants are decomposed under the action of microorganisms, when the dissolved oxygen in the water body is less than 0.2mg/L, the water body is converted into an anaerobic environment, and the water body can only slowly perform a reaction for degrading the pollutants in an anaerobic fermentation mode, so that a large amount of hydrogen sulfide and ammonia gas are generated, and black sludge is generated.
In the prior art, the ecological restoration of the water body mainly adopts in-situ restoration and ex-situ restoration technologies. Long in-situ repair time and slow effect; although the ectopic repair technology can achieve better effect, the investment is large and the occupied area is large.
Disclosure of Invention
The invention provides a device for purifying black and odorous water bodies in river channels, which aims to overcome the defects of large investment and large occupied area in the existing ectopic repair technology. In order to solve the technical problems, the invention is realized by adopting the following technical scheme:
the utility model provides a device for purifying river course black and odorous water body, includes a cavity the interior vertical direction of cavity can fluid conduction intake zone, biological reaction zone, sedimentation zone, play water zone, intake zone bottom is provided with the mud bucket, mud bucket bottom is connected with the mud pipe, biological reaction zone is filled with filler and microorganism bacterial.
Preferably, the filler is polyurethane, and the specific surface area of the polyurethane is 3.5X10 5 m 2 /m 3 。
Preferably, the filling rate of the filler is 10% -30%.
Preferably, the microbial species is bacillus and/or yeast and/or enzyme.
Preferably, a water inlet module is arranged in the center of the water inlet area, the water inlet module comprises a water inlet pipe and a central cylinder connected with the water inlet pipe, and the central cylinder is cylindrical and is opened towards the mud bucket.
Preferably, the water inlet module further comprises a flow guide baffle plate, and the flow guide baffle plate is arranged between the central cylinder and the mud bucket.
Preferably, the guide baffle is conical, and the bottom surface faces one side of the mud bucket.
Preferably, an aeration module is arranged at the top of the water inlet area, the aeration module comprises an aeration disc and aeration openings uniformly distributed on the aeration disc, and the aeration openings aerate towards the direction of the biological reaction area.
Preferably, the aeration amount is controlled at a gas-water ratio A epsilon [3:1,10: 1.
Preferably, the sedimentation zone is an inclined plate sedimentation zone, and an inclined pipe or an inclined plate made of pp material is adopted.
Preferably, the water inlet area, the biological reaction area, the sedimentation area and the water outlet area are isolated by a partition board, and the partition board is provided with air guide holes.
Optionally, the water inlet area, the biological reaction area, the sedimentation area and the water outlet area are isolated by a separation net.
Preferably, the sludge discharge pipe orifice is provided with a valve switch.
Preferably, the water outlet area is provided with a water outlet weir, and a water outlet is arranged in the water outlet weir.
Preferably, the water inlet area and the biological reaction area are provided with manholes.
Compared with the prior art, the technical scheme provided by the invention has the following technical effects or advantages:
1. by adopting the biological reaction zone, ammonia nitrogen, total nitrogen, low carbon compounds and macromolecular organic matters can be efficiently degraded, the investment is small, and the occupied area is small.
2. By filling the high molecular filler, the attachment quantity of microorganism strains can be improved, and the degradation efficiency is enhanced.
Drawings
FIG. 1 is a perspective view of a device for purifying black and odorous water body in a river channel according to the present invention;
FIG. 2 is a schematic cross-sectional view of the device for purifying black and odorous water body in river channel along the line A-A;
Detailed Description
In order to better understand the above technical solutions, the following description will explain the above technical solutions in detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the device for purifying black and odorous water in a river channel comprises a cavity 1, a water inlet area 2, a biological reaction area 3, a sedimentation area 4 and a water outlet area 5 which can be in fluid communication in the vertical direction in the cavity 1, wherein the water inlet area 2, the biological reaction area 3, the sedimentation area 4 and the water outlet area 5 are respectively isolated by a first partition board 17, a second partition board 18 and a third partition board 19, the first partition board 17, the second partition board 18 and the third partition board 19 are provided with air guide holes, and the partition boards can be replaced by partition nets.
The bottom of the water inlet area 2 is provided with a mud bucket 6, the bottom of the mud bucket 6 is connected with a mud pipe 7, and a valve switch (not shown in the figure) is arranged on the mud pipe 7. The center of the water inlet area 2 is provided with a water inlet module 10, the water inlet module 10 comprises a water inlet pipe 11 and a central cylinder 12 connected with the water inlet pipe 11, and the central cylinder 12 is cylindrical and is opened towards the mud bucket 6. The water inlet module 10 further comprises a guide baffle 13, the guide baffle 13 is arranged between the central cylinder 12 and the mud bucket 6, is conical, and the bottom surface faces one side of the mud bucket 6. The central cylinder 12 is matched with the guide plate 13 to uniformly distribute the sewage flowing into the water inlet area 2. The top of the water inlet zone 2 is provided with an aeration module 14, the aeration module 14 comprises an aeration disc 15 and aeration openings 16 uniformly distributed on the aeration disc 15, and the aeration openings 16 aerate towards the direction of the biological reaction zone 3.
The biological reaction zone 3 is filled with a filler 8 and microorganism strains (not shown in the figure), wherein the filler 8 is polyurethaneThe specific surface area of the polyurethane is 3.5X10 5 m 2 /m 3 The polyurethane with the specific surface area can improve the adhesion rate of microorganisms. The filling rate of the filler 8 is 10% -30%, so that the filler 8 in the device is in a flowing state, and sewage and microorganisms on the filler 8 can realize various contact modes such as cross flow, forward flow and the like, so that pollutants in the sewage are fully contacted with the microorganisms. The aeration rate is controlled to be between 3: 1-10: 1, a sample-well, anoxic and anaerobic three-phase purifying system can be formed in the filling material 8. Experiments prove that if the gas-water ratio is too small, the equipment is easy to be anaerobically, and meanwhile, the filler 8 is not easy to form a flowing state; the air-water ratio is too high, the microorganism aggregate formed by the filler 8 and microorganism strains is easy to be dispersed, the impact resistance of the system is weakened, and meanwhile, the aerobic-anoxic-anaerobic three-phase purification system is not beneficial to being formed in the filler 8. The microorganism strain is bacillus and/or saccharomycete and/or enzyme. After the strain is adopted, the water outlet effect of the device can be achieved: transparency of the film>25cm, ammonia nitrogen not more than 8mg/L (when the ammonia nitrogen in the water is more than 30mg/L, the ammonia nitrogen removal of the water is 70%), the dissolved oxygen not less than 2.0mg/L and the oxidation-reduction potential>50mV。
The sedimentation zone 4 is an inclined plate sedimentation zone, and adopts an inclined pipe or an inclined plate made of pp material.
The water outlet area 5 is provided with a water outlet weir 20, and a water outlet 21 is arranged in the water outlet weir 20. In order to facilitate observation of the conditions in the water inlet zone 2 and the biological reaction zone 3 of the device, a first manhole 22 and a second manhole 23 are respectively arranged on the outer walls of the water inlet zone 2 and the biological reaction zone 3.
The working process of the equipment is as follows: the sewage enters the central cylinder 12 from the water inlet pipe 11 for water distribution, the central cylinder 12 is matched with the guide plate 13 to realize uniform mixing and distribution of the sewage in the water inlet area 2, the water flows upwards under the action of the aeration module 14, and the microorganism aggregate formed by the filler 8 and microorganism strains flows downwards under the action of gravity, so that the microorganism and the pollutant in the sewage can fully contact in the biological reaction area 3 in the flowing mode.
The aeration port 16 aerates towards the direction of the biological reaction zone 3, oxygen is conveyed to the biological reaction zone 3, three interfaces of aerobiotic, anoxic and anaerobic are formed in the filler 8 of the biological reaction zone (the filler is aerobiotic, anoxic and anaerobic in sequence from outside to inside), and microorganisms perform aerobic nitrification, anoxic denitrification and other actions on the three interfaces to remove organic matters in the black and odorous water body.
The sewage enters the sedimentation zone 4 along with the air flow, is sedimentated by the sloping plate, performs mud-water separation, and the clean water is discharged through the water outlet 21 in the water outlet weir 20. The sludge is continuously fused into larger sludge blocks under the collision of the inclined plates, when the self weight of the sludge blocks is larger than the water flow supporting force, the sludge blocks fall downwards, enter the water inlet area 2 through the sedimentation area 4 and the biological reaction area 3, finally sediment in the mud bucket 6 and are discharged through the mud discharge pipe 7.
Claims (2)
1. The device for purifying the black and odorous water body of the river is characterized by comprising a cavity, a water inlet area, a biological reaction area, a sedimentation area and a water outlet area, wherein the water inlet area, the biological reaction area, the sedimentation area and the water outlet area can be communicated with fluid in the vertical direction in the cavity, the water inlet area, the biological reaction area, the sedimentation area and the water outlet area are isolated by a partition board, and the partition board is provided with air guide holes;
a mud bucket is arranged at the bottom of the water inlet area, and a mud pipe is connected to the bottom of the mud bucket;
the center of the water inlet area is provided with a water inlet module, the water inlet module comprises a water inlet pipe and a central cylinder connected with the water inlet pipe, and the central cylinder is cylindrical and is opened towards the mud bucket; the water inlet module further comprises a flow guide baffle plate, the flow guide baffle plate is arranged between the central cylinder and the mud bucket, the flow guide baffle plate is conical, and the bottom surface faces one side of the mud bucket;
an aeration module is arranged at the top of the water inlet area, and comprises an aeration disc and an aeration port connected with the aeration disc; the aeration amount of the aeration module is controlled at the air-water ratio A epsilon [3:1,10: 1];
the biological reaction area is filled with filler and microorganism strain, the filler is polyurethane, and the specific surface area of the polyurethane is 3.5X10 5 m 2 /m 3 The filling rate of the filler is 1030 percent of the microbial strain is bacillus and/or saccharomycete;
the aeration port is used for aerating towards the direction of the biological reaction zone, oxygen is conveyed to the biological reaction zone, and three interfaces of aerobiotic, anoxic and anaerobic are formed in the filler of the biological reaction zone, wherein the filler is sequentially an aerobiotic interface, an anoxic interface and an anaerobic interface from outside to inside;
the water outlet effect of the device for purifying the black and odorous water body of the river channel reaches: the transparency is more than 25cm, the ammonia nitrogen is less than or equal to 8mg/L, the dissolved oxygen is more than or equal to 2.0mg/L, and the oxidation-reduction potential is more than 50mV; when the ammonia nitrogen in the inlet water is more than 30mg/L, the ammonia nitrogen removal rate of the outlet water is 70%.
2. The apparatus for purifying a body of black and odorous water in a river course of claim 1, wherein the water outlet area is provided with a water outlet weir, and a water outlet is provided in the water outlet weir.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810918146.2A CN108726819B (en) | 2018-08-13 | 2018-08-13 | Device for purifying black and odorous water body of river channel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810918146.2A CN108726819B (en) | 2018-08-13 | 2018-08-13 | Device for purifying black and odorous water body of river channel |
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| Publication Number | Publication Date |
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| CN108726819A CN108726819A (en) | 2018-11-02 |
| CN108726819B true CN108726819B (en) | 2024-03-26 |
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| CN201810918146.2A Active CN108726819B (en) | 2018-08-13 | 2018-08-13 | Device for purifying black and odorous water body of river channel |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112624489A (en) * | 2019-10-08 | 2021-04-09 | 天津科技大学 | Purify ecological dam device in black and odorous river course |
| CN111908714A (en) * | 2020-07-16 | 2020-11-10 | 上海环境绿色生态修复科技有限公司 | Cruising type river water purification system on water surface |
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| CN205803261U (en) * | 2016-07-02 | 2016-12-14 | 武汉森泰环保股份有限公司 | A kind of reaction precipitation integrated aerobic fluid bed |
| CN106315844A (en) * | 2016-09-27 | 2017-01-11 | 华南理工大学 | ANAMMOX reactor and starting method thereof by inoculating mixed sludge |
| CN208776531U (en) * | 2018-08-13 | 2019-04-23 | 碧沃丰工程有限公司 | A kind of device purifying river black and odorous water |
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2018
- 2018-08-13 CN CN201810918146.2A patent/CN108726819B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004041981A (en) * | 2002-07-15 | 2004-02-12 | Mitsubishi Heavy Ind Ltd | Organic waste water treatment method and its system |
| CA2583752A1 (en) * | 2004-10-12 | 2006-04-20 | Biocast Systems, Inc. | Integrated multi-zone wastewater treatment system and method |
| CN104671617A (en) * | 2015-03-12 | 2015-06-03 | 大连交通大学 | Integrated treatment equipment for mixed waste cutting fluid and domestic sewage |
| CN204625325U (en) * | 2015-03-16 | 2015-09-09 | 广西迦姆农业生物技术有限公司 | A kind of microorganism sewage purifying device |
| CN204999692U (en) * | 2015-09-24 | 2016-01-27 | 杭州师范大学 | Fall STREAMING and mix packing layer anaerobic ammonium oxidation bioreactor |
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| CN208776531U (en) * | 2018-08-13 | 2019-04-23 | 碧沃丰工程有限公司 | A kind of device purifying river black and odorous water |
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| CN108726819A (en) | 2018-11-02 |
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