CN108658231B - Unpowered multistage oxygenation treatment discharge scale lifting device for rural domestic sewage - Google Patents
Unpowered multistage oxygenation treatment discharge scale lifting device for rural domestic sewage Download PDFInfo
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- CN108658231B CN108658231B CN201810247867.5A CN201810247867A CN108658231B CN 108658231 B CN108658231 B CN 108658231B CN 201810247867 A CN201810247867 A CN 201810247867A CN 108658231 B CN108658231 B CN 108658231B
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- unpowered
- water inlet
- oxygenation
- anaerobic chamber
- water
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- 239000010865 sewage Substances 0.000 title claims abstract description 82
- 238000006213 oxygenation reaction Methods 0.000 title claims abstract description 64
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 113
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000001301 oxygen Substances 0.000 claims abstract description 30
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 30
- 230000000694 effects Effects 0.000 claims abstract description 15
- 241001148470 aerobic bacillus Species 0.000 claims description 11
- 238000007790 scraping Methods 0.000 claims description 10
- 238000005192 partition Methods 0.000 claims description 9
- 241001148471 unidentified anaerobic bacterium Species 0.000 claims description 6
- 238000005868 electrolysis reaction Methods 0.000 claims description 4
- 239000000945 filler Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000002372 labelling Methods 0.000 claims 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 241000588724 Escherichia coli Species 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The utility model provides an unpowered multistage oxygenation treatment of rural domestic sewage discharges and carries mark device, including open-type good oxygen case, open-type good oxygen case one side upper portion is equipped with the water inlet, be equipped with the unpowered oxygenation water-locator that cooperates with the water inlet in the open-type good oxygen case, open-type good oxygen case one side lower part that keeps away from the water inlet is equipped with closed anaerobism room in the good oxygen case, closed anaerobism room top is less than unpowered oxygenation water-locator, closed anaerobism room top is equipped with unpowered oxygenation waterwheel and unpowered oxygenation ditch board in proper order, unpowered oxygenation waterwheel sets up in the one side that is close to the water inlet, be equipped with the anaerobic room inlet tube that communicates unpowered oxygenation ditch board and closed anaerobism room inside on the closed anaerobism room, be equipped with the aerobe in the open-type good oxygen case in the closed anaerobism room, it has rational in structural design, need not power input, multistage increase sewage and good aerobe contact area, with low cost, domestic sewage treatment effect advantage.
Description
Technical field:
the invention relates to the technical field of sewage treatment, in particular to a rural domestic sewage treatment discharge scale lifting device based on a three-format septic tank.
The background technology is as follows:
at present, the rural domestic sewage is treated by mainly adopting a tri-format septic tank, and the use of the tri-format septic tank plays a certain role in treating the rural domestic sewage, but the treatment of the domestic sewage is still in a primary stage, the domestic sewage treated by the tri-format septic tank can not reach the discharge standard and can not be reused, and the soil and the surrounding environment can be polluted after the domestic sewage is discharged.
It is known that sewage treatment effect can be effectively improved by anaerobic treatment and then aerobic treatment. However, the existing aerobic bacteria treatment mode needs to continuously inject oxygen into the sewage through an oxygen adding pump so as to keep the oxygen concentration in the sewage, which undoubtedly increases the cost of the aerobic bacteria treatment mode, has higher cost for rural areas, heavier burden and difficult bearing of villages, leads to the common adoption of a single anaerobic bacteria treatment mode in the rural areas, and finally affects the treatment effect of rural domestic sewage. Therefore, how to combine the aerobic bacteria treatment mode and the anaerobic bacteria treatment mode (three-format septic tank) on the premise of reducing the cost of the aerobic bacteria treatment mode becomes urgent for solving the problem of rural domestic sewage treatment.
The invention comprises the following steps:
the invention aims to make up the defects of the prior art, and provides an unpowered multistage oxygenation treatment discharge standard-lifting device for rural domestic sewage, which has the advantages of reasonable structural design, no need of power input, multistage increase of the contact area between sewage and aerobic bacteria, low cost, good domestic sewage treatment effect and the like, and solves the problems in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides an unpowered multistage oxygenation treatment of rural domestic sewage discharges and carries mark device, includes open-type good oxygen case, open-type good oxygen case one side upper portion is equipped with the water inlet, be equipped with the unpowered oxygenation water-locator of water inlet complex in the open-type good oxygen case, open-type good oxygen incasement one side lower part that keeps away from the water inlet is equipped with closed anaerobism room, and closed anaerobism room top is less than unpowered oxygenation water-locator, closed anaerobism room top is equipped with unpowered oxygenation waterwheel and unpowered oxygenation ditch board in proper order, and unpowered oxygenation waterwheel sets up the one side that is close to the water inlet, be equipped with the anaerobism room inlet tube that communicates unpowered oxygenation ditch board and closed anaerobism room inside on the closed anaerobism room, be equipped with the delivery port on the closed anaerobism room lateral wall, be equipped with aerobe equipped with aerobics in the open-type good oxygen case in the closed anaerobism room.
The unpowered oxygen increasing water distributor is characterized in that a partition plate is arranged right below one end, far away from the water inlet, of the unpowered oxygen increasing water distributor, two sides of the partition plate are arranged on the side wall of the open type aerobic box, the upper end of the partition plate is higher than the top of the closed type anaerobic chamber, and water inlet channels are arranged between the lower end of the partition plate and the inner bottom of the open type aerobic box and between the partition plate and the closed type anaerobic chamber.
The unpowered oxygen increasing water distributor comprises a supporting plate obliquely arranged on the side wall of the open-type aerobic box, a plurality of water through holes are uniformly formed in the supporting plate, and a barb baffle is arranged on one side, away from the water inlet, of each water through hole in the supporting plate.
The unpowered oxygenation waterwheel comprises a waterwheel support, a rotating shaft is arranged on the waterwheel support, a plurality of scraping plates are uniformly arranged on the rotating shaft, and a baffle matched with the scraping plates is arranged at the top of the closed anaerobic chamber below the rotating shaft.
The unpowered oxygenation ditch plate comprises a plurality of channel plates vertically arranged at the top of the closed anaerobic chamber, the channel plates form an S-shaped water inlet channel, an inlet of the S-shaped water inlet channel is matched with the unpowered oxygenation waterwheel, and an outlet of the S-shaped water inlet channel is communicated with the water inlet pipe of the anaerobic chamber.
The top of the closed anaerobic chamber is uniformly provided with a plurality of inverted V-shaped plates corresponding to the S-shaped water inlet channel.
The tail end of the water inlet pipe of the anaerobic chamber is communicated to the bottom of the closed anaerobic chamber.
The open type aerobic box is internally provided with high-activity nano multi-metal micro-electrolysis filler.
According to the technical scheme, the unpowered multistage oxygenation treatment discharge standard-raising device for rural domestic sewage is designed on the basis of the existing three-format septic tank, a water inlet is connected with an outlet of the existing three-format septic tank through an open type aerobic tank and a closed type anaerobic chamber, unpowered aerobic bacteria treatment and anaerobic bacteria treatment are carried out on sewage treated by the existing three-format septic tank, and then the domestic sewage treatment reaches the discharge standard; by designing an unpowered oxygenation water distributor, an unpowered oxygenation water truck and an unpowered oxygenation ditch plate, three-level oxygenation is realized, and further, the contact area of sewage and oxygen can be increased without power, so that the sewage treatment efficiency and effect are improved; the unpowered multistage oxygenation treatment discharge scale lifting device for rural domestic sewage has the advantages of being low in cost, good in sewage treatment effect and high in sewage treatment efficiency, and being convenient to popularize and use in rural areas, and the unpowered multistage oxygenation treatment discharge scale lifting device for rural domestic sewage can further perform aerobic treatment and anaerobic treatment without power on water discharged from the three-format septic tank under the condition of fully utilizing the existing three-format septic tank.
Description of the drawings:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is a top view of the present invention;
in the figure, 1, an open type aerobic box, 2, a water inlet, 3, an unpowered oxygen increasing water distributor, 301, a supporting plate, 302, a water through hole, 303, a barb baffle, 4, a closed anaerobic chamber, 5, an unpowered oxygen increasing waterwheel, 501, a waterwheel bracket, 502, a rotating shaft, 503, a scraper blade, 504, a baffle, 6, an unpowered oxygen increasing ditch plate, 601, a channel plate, 602, an S-shaped water inlet channel, 603, an inverted V-shaped plate, 7, an anaerobic chamber water inlet pipe, 8, a water outlet, 9, a partition plate, 10 and a water inlet channel.
The specific embodiment is as follows:
in order to clearly illustrate the technical features of the present solution, the present invention will be described in detail below with reference to the following detailed description and the accompanying drawings.
As shown in fig. 1-3, the device for discharging and lifting standard for unpowered multistage oxygenation treatment of rural domestic sewage comprises an open type aerobic box 1, wherein a water inlet 2 is formed in the upper portion of one side of the open type aerobic box 1, an unpowered oxygenation water distributor 3 matched with the water inlet 2 is arranged in the open type aerobic box 1, a closed type anaerobic chamber 4 is arranged in the lower portion of one side, far away from the water inlet 2, of the open type aerobic box 1, the top of the closed type anaerobic chamber 4 is lower than the unpowered oxygenation water distributor 3, an unpowered oxygenation water truck 5 and an unpowered oxygenation ditch plate 6 are sequentially arranged at the top of the closed type anaerobic chamber 4, the unpowered oxygenation water truck 5 is arranged on one side, close to the water inlet 2, of the top of the closed type anaerobic chamber 4, an anaerobic chamber water inlet pipe 7 for communicating the unpowered oxygenation ditch plate 6 with the inside of the closed type anaerobic chamber 4 is arranged on the closed type anaerobic chamber 4, an water outlet 8 is formed in the side wall of the closed type aerobic chamber 4, aerobic bacteria are arranged in the open type aerobic box 1, and anaerobic bacteria are arranged in the closed type anaerobic chamber 4. The water inlet 2 is connected with the outlet of the existing three-format septic tank through the design of the open type aerobic tank 1 and the closed type anaerobic chamber 4, and the sewage after the treatment of the existing three-format septic tank is subjected to unpowered aerobic bacteria treatment and anaerobic bacteria treatment, so that the domestic sewage treatment reaches the emission standard, and the open type aerobic tank 1 can sterilize the sewage through ultraviolet rays in sunlight, such as escherichia coli; by designing the unpowered oxygenation water distributor 3, the unpowered oxygenation water truck 5 and the unpowered oxygenation ditch plate 6, three-level oxygenation is realized, and further, the contact area of sewage and oxygen can be increased without power, so that the sewage treatment efficiency and effect are improved; the unpowered multistage oxygenation treatment discharge scale lifting device for rural domestic sewage has the advantages of being low in cost, good in sewage treatment effect and high in sewage treatment efficiency, and being convenient to popularize and use in rural areas, and the unpowered multistage oxygenation treatment discharge scale lifting device for rural domestic sewage can further perform aerobic treatment and anaerobic treatment without power on water discharged from the three-format septic tank under the condition of fully utilizing the existing three-format septic tank.
A baffle plate 9 is arranged right below one end of the unpowered oxygen increasing water distributor 3, which is far away from the water inlet 2, two sides of the baffle plate 9 are arranged on the side wall of the open type aerobic box 1, the upper end of the baffle plate 9 is higher than the top of the closed type anaerobic chamber 4, and water inlet channels 10 are arranged between the lower end of the baffle plate 9 and the inner bottom of the open type aerobic box 1 and between the baffle plate 9 and the closed type anaerobic chamber 4. The fluidity of sewage at the bottom of the open type aerobic tank 1 can be realized, dead angles in sewage treatment are prevented, and the sewage treatment effect is further improved.
The unpowered oxygen increasing water distributor 3 comprises a supporting plate 301 obliquely arranged on the side wall of the open-type aerobic box 1, a plurality of water through holes 302 are uniformly formed in the supporting plate 301, and a barb baffle 303 is arranged on one side, corresponding to each water through hole 302, of the supporting plate 301, away from the water inlet 2. The sewage which is convenient to enter flows out from the water through holes 302, so that the sewage is split, and the contact area of the sewage and the air is increased.
The unpowered oxygenation waterwheel 5 comprises a waterwheel support 501, a rotating shaft 502 is arranged on the waterwheel support 501, a plurality of scraping plates 503 are uniformly arranged on the rotating shaft 502, a baffle 504 matched with the scraping plates 503 is arranged at the top of a closed anaerobic chamber 4 under the rotating shaft 502, the purpose that the scraping plates 503 are pushed to rotate by sewage is achieved, the scraping plates 503 scrape the sewage, the contact area of the sewage and air is increased, and meanwhile the sewage is pushed to enter an S-shaped water inlet channel 602.
The unpowered oxygenation ditch plate 6 comprises a plurality of channel plates 601 vertically arranged at the top of the closed anaerobic chamber 4, the channel plates 601 form an S-shaped water inlet channel 602, the inlet of the S-shaped water inlet channel 602 is matched with the unpowered oxygenation water truck 5, the outlet of the S-shaped water inlet channel is communicated with the anaerobic chamber water inlet pipe 7, and the contact area of sewage and air is increased by designing the S-shaped water inlet channel, so that aerobic treatment is accelerated.
The position of the top of the closed anaerobic chamber 4 corresponding to the S-shaped water inlet channel 602 is uniformly provided with a plurality of inverted V-shaped plates 603, and the inverted V-shaped plates 603 are matched with the S-shaped water inlet channel 602, so that sewage entering the S-shaped water inlet channel 602 is uniformly stirred and advances in a wave shape, the contact area of the sewage and oxygen is further increased, and the sewage treatment effect is improved.
The tail end of the anaerobic chamber water inlet pipe 7 is communicated to the bottom of the closed anaerobic chamber 4, so that the sewage is fully sterilized and eliminated, and particularly substances containing ammonia, nitrogen and the like are decomposed, and the sewage is decolorized.
The high-activity nano multi-metal micro-electrolysis filler is arranged in the open type aerobic tank 1, and the high-activity nano multi-metal micro-electrolysis filler is matched with aerobic bacteria to further improve the treatment of sewage in an aerobic stage.
The working process of the invention comprises the following steps:
firstly, the water inlet 2 of the application is connected with the outlet of the existing tri-grid septic tank, sewage discharged through the tri-grid septic tank enters the open type aerobic tank 1 through the water inlet 2, sewage flows to the unpowered oxygenation water distributor 3 through the water inlet 2, the sewage efficiently flows out of the water through holes 302 under the action of the barb baffle 303, falls to the bottom of the open type aerobic tank 1 under the action of gravity, the sewage is divided into a plurality of small water flows under the action of the unpowered oxygenation water distributor 3, the contact area of the sewage and oxygen is further increased (the contact with aerobic bacteria is increased), as the sewage continuously enters, the sewage at the bottom of the open type aerobic tank 1 enters the water inlet channel 10 under the action of the baffle 9, when the water level in the water inlet channel 10 exceeds the water in the closed type anaerobic chamber 4, the water flow pushes the scraping plate 503 to rotate, the contact area of the sewage and oxygen is increased under the action of the scraping plate 503, the sewage passing through the unpowered oxygenation water truck 5 enters the S-shaped water inlet channel 602, the sewage is in an S-shaped and wave shape and advances under the action of the unpowered oxygenation water distributor 3, the sewage uniformly flows out of the S-shaped water inlet channel 602, the sewage uniformly flows out of the anaerobic chamber through the anaerobic chamber 7, the anaerobic chamber is discharged through the anaerobic chamber, and the anaerobic chamber is in the anaerobic chamber 7, and the anaerobic chamber is discharged through the anaerobic chamber, for example, the water is in the closed type 7 is discharged, and the water inlet channel is subjected to the standard anaerobic treatment, and the water is discharged, and the sewage enters the anaerobic chamber, and the water inlet chamber is subjected to the water, and the sewage is subjected to the anaerobic treatment 7, and the sewage is subjected to the water treatment and the sewage treatment 7. The unpowered multistage oxygenation treatment discharge scale lifting device for rural domestic sewage has the advantages of no need of power, low cost, good sewage treatment effect and the like, and is convenient to popularize and use in rural areas.
The above embodiments are not to be taken as limiting the scope of the invention, and any alternatives or modifications to the embodiments of the invention will be apparent to those skilled in the art and fall within the scope of the invention.
The present invention is not described in detail in the present application, and is well known to those skilled in the art.
Claims (7)
1. The utility model provides a rural domestic sewage unpowered multistage oxygenation treatment discharges and carries mark device which characterized in that: the anaerobic treatment device comprises an open type aerobic box, wherein a water inlet is formed in the upper part of one side of the open type aerobic box, an unpowered oxygenation water distributor matched with the water inlet is arranged in the open type aerobic box, a closed type anaerobic chamber is formed in the lower part of one side of the open type aerobic box, which is far away from the water inlet, the top of the closed type anaerobic chamber is lower than the unpowered oxygenation water distributor, an unpowered oxygenation water truck and an unpowered oxygenation ditch plate are sequentially arranged at the top of the closed type anaerobic chamber, the unpowered oxygenation water truck is arranged on one side, which is close to the water inlet, an anaerobic chamber water inlet pipe which is communicated with the unpowered oxygenation ditch plate and the interior of the closed type anaerobic chamber is arranged on the closed type anaerobic chamber, a water outlet is formed in the side wall of the closed type anaerobic chamber, aerobic bacteria are arranged in the closed type aerobic box, and anaerobic bacteria are arranged in the closed type anaerobic chamber;
the unpowered oxygenation ditch plate comprises a plurality of channel plates vertically arranged at the top of the closed anaerobic chamber, the channel plates form an S-shaped water inlet channel, an inlet of the S-shaped water inlet channel is matched with the unpowered oxygenation water truck, and an outlet of the S-shaped water inlet channel is communicated with the water inlet pipe of the anaerobic chamber;
the unpowered oxygen increasing water distributor is characterized in that a partition plate is arranged right below one end, far away from the water inlet, of the unpowered oxygen increasing water distributor, two sides of the partition plate are arranged on the side wall of the open type aerobic box, and the upper end of the partition plate is higher than the top of the closed type anaerobic chamber.
2. The rural domestic sewage unpowered multistage oxygenation treatment discharge labeling device according to claim 1, wherein: a water inlet channel is arranged between the lower end of the baffle plate and the inner bottom of the open type aerobic box and between the baffle plate and the closed type anaerobic chamber.
3. The rural domestic sewage unpowered multistage oxygenation treatment discharge labeling device according to claim 1, wherein: the unpowered oxygen increasing water distributor comprises a supporting plate obliquely arranged on the side wall of the open-type aerobic box, a plurality of water through holes are uniformly formed in the supporting plate, and a barb baffle is arranged on one side, away from the water inlet, of each water through hole in the supporting plate.
4. The rural domestic sewage unpowered multistage oxygenation treatment discharge labeling device according to claim 1, wherein: the unpowered oxygenation waterwheel comprises a waterwheel support, a rotating shaft is arranged on the waterwheel support, a plurality of scraping plates are uniformly arranged on the rotating shaft, and a baffle matched with the scraping plates is arranged at the top of the closed anaerobic chamber below the rotating shaft.
5. The rural domestic sewage unpowered multistage oxygenation treatment discharge labeling device according to claim 1, wherein: the top of the closed anaerobic chamber is uniformly provided with a plurality of inverted V-shaped plates corresponding to the S-shaped water inlet channel.
6. The rural domestic sewage unpowered multistage oxygenation treatment discharge labeling device according to claim 1, wherein: the tail end of the water inlet pipe of the anaerobic chamber is communicated to the bottom of the closed anaerobic chamber.
7. The rural domestic sewage unpowered multistage oxygenation treatment discharge labeling device according to claim 1, wherein: the open type aerobic box is internally provided with high-activity nano multi-metal micro-electrolysis filler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810247867.5A CN108658231B (en) | 2018-03-23 | 2018-03-23 | Unpowered multistage oxygenation treatment discharge scale lifting device for rural domestic sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810247867.5A CN108658231B (en) | 2018-03-23 | 2018-03-23 | Unpowered multistage oxygenation treatment discharge scale lifting device for rural domestic sewage |
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| Publication Number | Publication Date |
|---|---|
| CN108658231A CN108658231A (en) | 2018-10-16 |
| CN108658231B true CN108658231B (en) | 2024-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810247867.5A Active CN108658231B (en) | 2018-03-23 | 2018-03-23 | Unpowered multistage oxygenation treatment discharge scale lifting device for rural domestic sewage |
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| CN105399203A (en) * | 2015-11-02 | 2016-03-16 | 重庆大学 | Lateral subsurface flow wetland treatment device and treatment method capable of realizing ANAMMOX denitrification |
| CN205635263U (en) * | 2016-04-29 | 2016-10-12 | 合肥市科柏盛环保科技有限公司 | Rural domestic sewage is unpowered to oxygenate purification composite media wetland system |
| CN105859051A (en) * | 2016-06-06 | 2016-08-17 | 王佳莺 | Biogas slurry optical treatment breeding system and working method thereof |
| CN208345855U (en) * | 2018-03-23 | 2019-01-08 | 山东航凯船舶科技有限公司 | A kind of discharge of domestic sewage in rural areas power-free multi-stage aerobic treatment mentions device for mark |
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