CN105481197A - Small sewage treatment device - Google Patents
Small sewage treatment device Download PDFInfo
- Publication number
- CN105481197A CN105481197A CN201610042880.8A CN201610042880A CN105481197A CN 105481197 A CN105481197 A CN 105481197A CN 201610042880 A CN201610042880 A CN 201610042880A CN 105481197 A CN105481197 A CN 105481197A
- Authority
- CN
- China
- Prior art keywords
- pond
- baf
- tank
- preliminary sedimentation
- sedimentation tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000010865 sewage Substances 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000006243 chemical reaction Methods 0.000 claims abstract description 25
- 230000018044 dehydration Effects 0.000 claims abstract description 13
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 13
- 239000010802 sludge Substances 0.000 claims abstract description 13
- 238000004062 sedimentation Methods 0.000 claims description 42
- 230000007246 mechanism Effects 0.000 claims description 16
- 238000009833 condensation Methods 0.000 claims description 7
- 230000005494 condensation Effects 0.000 claims description 7
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 6
- 239000000701 coagulant Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 238000011010 flushing procedure Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- 238000004659 sterilization and disinfection Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010907 mechanical stirring Methods 0.000 description 2
- 239000010841 municipal wastewater Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 229920002401 polyacrylamide Polymers 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- -1 aluminium chlorohydroxide Chemical compound 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002699 waste material 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
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
- C02F1/5281—Installations for water purification using chemical agents
-
- 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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- 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
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention relates to sewage treatment, in particular to a small sewage treatment device. The small sewage treatment device comprises a filter-press dehydration device, a sludge concentration and discharge pipe, a grating connected with a raw water inlet pipe, a lift pump connected with a water outlet end of the grating, a primary settling tank connected with a water outlet end of the lift pump, a biological aerated filter connected with a water outlet end of the primary setting tank, a reaction tank connected with a water outlet end of the biological aerated filter and a secondary settling tank connected with a water outlet end of the reaction tank, wherein the secondary settling tank is connected with a water outlet pipe, and the primary settling tank and the secondary settling tank are connected with the filter-press dehydration device which is connected with the sludge concentration and discharge pipe. The small sewage treatment device has the benefits as follows: miniature design can be realized, and the device has the advantages of small occupied area, low cost, simple structure and lower water consumption.
Description
Technical field
The present invention relates to sewage disposal, particularly relate to Small Sewage Treatment Equipment.
Background technology
Existing waste disposal plant is generally large-scale plant, and floor space is large, and cost is high, complex structure, and water loss is larger.
Summary of the invention
In order to solve the problems of the prior art, the invention provides the Small Sewage Treatment Equipment that a kind of floor space is little, cost is low, structure is simple, water loss is less.
The invention provides a kind of Small Sewage Treatment Equipment, comprise filter-press dehydration device, sludge condensation delivery pipe, the grid be connected with former water water inlet pipe, the lift pump be connected with the water side of described grid, the preliminary sedimentation tank be connected with the water side of described lift pump, the BAF be connected with the water side of described preliminary sedimentation tank, the reaction tank be connected with the water side of described BAF and the second pond be connected with the water side of described reaction tank, described second pond is connected with rising pipe, described preliminary sedimentation tank, second pond is connected with described filter-press dehydration device respectively, described filter-press dehydration device is connected with described sludge condensation delivery pipe.
As a further improvement on the present invention, described second pond is arranged on the bottom of described reaction tank.
As a further improvement on the present invention, described reaction tank is connected with coagulant dosage mechanism, is provided with stirring mechanism in described reaction tank, and described stirring mechanism is preferably mechanical stirring mechanism or pneumatic blending mechanism.
As a further improvement on the present invention, described preliminary sedimentation tank is vertical sedimentation basin, and the bottom of described preliminary sedimentation tank is provided with storage mud space.
As a further improvement on the present invention, described second pond is vertical sedimentation basin, and the bottom of described second pond is provided with storage mud space.
As a further improvement on the present invention, apparatus for ultraviolet disinfection is connected with between described second pond, rising pipe.
As a further improvement on the present invention, described BAF comprises anoxic pond and Aerobic Pond, and described anoxic pond and aerobic cell compartment are arranged in series.
As a further improvement on the present invention, oil separation grit chamber is connected with between described former water water inlet pipe, grid.
As a further improvement on the present invention, the top of described preliminary sedimentation tank is provided with oil removal unit.
As a further improvement on the present invention, described grid is fine fack, and described BAF is connected with back flushing mechanism.
The invention has the beneficial effects as follows: by such scheme, miniaturization Design can be realized that there is the advantage that floor space is little, cost is low, structure is simple, water loss is less.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of Small Sewage Treatment Equipment of the present invention;
Fig. 2 is the structural representation of the BAF of a kind of Small Sewage Treatment Equipment of the present invention.
Embodiment
Illustrate below in conjunction with accompanying drawing and embodiment the present invention is further described.
Drawing reference numeral in Fig. 1 to Fig. 2 is: grid 1; Lift pump 2; Preliminary sedimentation tank 3; BAF 4; Anoxic pond 41,43,45; Aerobic Pond 42,44,46; Reaction tank 5; Second pond 6; Sludge condensation delivery pipe 7.
As shown in Figure 1, a kind of Small Sewage Treatment Equipment, comprise filter-press dehydration device, sludge condensation delivery pipe 7, the grid 1 be connected with former water water inlet pipe, the lift pump 2 be connected with the water side of described grid 1, the preliminary sedimentation tank 3 be connected with the water side of described lift pump 2, the BAF 4 be connected with the water side of described preliminary sedimentation tank 3, the reaction tank 5 be connected with the water side of described BAF 4 and the second pond 6 be connected with the water side of described reaction tank 5, described second pond 6 is connected with rising pipe, described preliminary sedimentation tank 3, second pond 6 is connected with described filter-press dehydration device respectively, described filter-press dehydration device is connected with described sludge condensation delivery pipe 7.
As shown in Figure 1, described second pond 6 is arranged on the bottom of described reaction tank 5.
As shown in Figure 1, described reaction tank 5 is connected with coagulant dosage mechanism, stirring mechanism is provided with in described reaction tank 5, described stirring mechanism is preferably mechanical stirring mechanism or pneumatic blending mechanism, add PAC(polymerize aluminum chloride by coagulant dosage mechanism and also claim aluminium chlorohydroxide code name PAC, usually also referred to as water purification agent or coagulating agent) and PAM(polyacrylamide).
As shown in Figure 1, described preliminary sedimentation tank 3 is vertical sedimentation basin, and the bottom of described preliminary sedimentation tank 3 is provided with storage mud space.
As shown in Figure 1, described second pond 6 is vertical sedimentation basin, and the bottom of described second pond 6 is provided with storage mud space.
As shown in Figure 1, apparatus for ultraviolet disinfection is connected with between described second pond 6, rising pipe.
As shown in Figure 2, described BAF 4 comprises anoxic pond 41,43,45 and Aerobic Pond 42,44,46, described anoxic pond 41,43,45 and Aerobic Pond 42,44,46 spaced series are arranged, and namely anoxic pond 41, Aerobic Pond 42, anoxic pond 43, Aerobic Pond 44, anoxic pond 45, Aerobic Pond 46 are arranged by water inlet sequencing.
As shown in Figure 1, oil separation grit chamber is connected with between described former water water inlet pipe, grid 1.
As shown in Figure 1, the top of described preliminary sedimentation tank 3 is provided with oil removal unit.
As shown in Figure 1, described grid 1 is fine fack, and described BAF 4 is connected with back flushing mechanism.
The principle of work of a kind of Small Sewage Treatment Equipment provided by the invention is:
(1) municipal wastewater (former water) is through fine fack, removes scum silica frost in water, is then promoted to preliminary sedimentation tank 3;
(2) pre-treatment water outlet enters preliminary sedimentation tank 3 through lift pump 2.Preliminary sedimentation tank 3 adopts the vertical sedimentation basin after improving, and settling tank sedimentation time is only 1.0 hours.Preliminary sedimentation tank 3 top arranges oil removal unit; Storage mud space is set bottom preliminary sedimentation tank 3, holds the sludge quantity of 1-2 days;
(3) preliminary sedimentation tank 3 water outlet enters BAF 4(BAF), in BAF 4, complete organic matter degradation, nitrated and synchronous denitrification, residence time 2.0-2.5 hour;
BAF is a kind of biochemical reactor efficiently, and the removal especially for ammonia nitrogen and total nitrogen has significant advantage.The present invention adopts BAF 4, processing efficiency is close to technology such as biostyr, but technical sophistication degree significantly reduces: head loss is less than 0.2m, backwashing period 20-30 days, backwash process only needs air purge 5 minutes, draining 10 minutes, back flushing air is from emergency blower, in parallel without the need to multiple BAF, non-recoil wash water pump, does not need automatic control system;
(4) BAF 4 water outlet enters reaction tank 5.Reaction tank 5 is at top, Dephosphorization reagent is added in reaction tank 5, adopt machinery or pneumatic blending, reaction tank 5 water outlet enters the second pond 6 of bottom, second pond 6 is identical with the structure of preliminary sedimentation tank 3, all adopts the vertical sedimentation basin after improving, sedimentation time 1 hour, precipitation bottom arranges storage mud space, holds the sludge quantity of 4 hours;
(5) second pond 6 water outlet directly or discharge after ultra violet sterilizer;
(6), after preliminary sedimentation tank 3 and second pond 6 base sludge carry out filter-press dehydration by filter-press dehydration device, transport outward together with grid slag etc.
The technological principle of a kind of Small Sewage Treatment Equipment provided by the invention is:
(1) removal of organism and ammonia nitrogen
Organism and ammonia nitrogen are removed mainly through preliminary sedimentation tank 3, reaction tank 5 and BAF 4, and core cell is BAF 4.
1. preliminary sedimentation tank 3: under flocculation and precipitating action, the solidity organism in water, colloidal organic matter are removed.
2. BAF 4: BAF 4 is core cells of organism and ammonia nitrogen removal.Organism and ammonia nitrogen obtain removing more thoroughly in BAF 4.BAF 4 is high-performance bio membrane reactors, is specially adapted to municipal wastewater process.BAF 4 filtrate specific surface area is large, and filter material surface is enriched heterotrophic bacterium and nitrifier, provides dissolved oxygen by aeration, thus realizes the efficient removal of organism and ammonia nitrogen.
(2) removal of total nitrogen
Total nitrogen is removed mainly through BAF 4.In BAF 4, separated by interval, BAF 4 is separated into more than 4 regions of connecting.When sewage enters BAF pond, adopt multipoint water feeding.As shown in Figure 2, BAF 4 is divided into 6 regions, and 41,43,45 districts are anoxic pond, and 42,44,46 districts are Aerobic Pond.
By alternately realizing anoxic, aerobic, the organism that can make full use of in water realizes denitrification, and denitrification also been removed partial organic substances simultaneously, degrades the organic loading of aerobic zone.
According between regional sewage quality feature appropriate design anoxic, aerobic zone, effective removal of total nitrogen can be realized, clearance >60%.
Common BAF technology must by arranging nitrated filter tank (N pond) and denitrification filter pool (DN pond) separately, and this technology can arrange anoxic pond 41,43,45 and Aerobic Pond 42,44,46 interval in inside, thus realizes the nitrification and denitrification in single pond.
(3) removal of total phosphorus
The removal of phosphorus is mainly through settling tank 3 and reaction tank 5.
1. preliminary sedimentation tank 3: the phosphorus that solidity can be removed by preliminary sedimentation tank 3.
2. BAF 4: in BAF 4, the microorganism of filler and filling surface can retain the phosphorus of solidity residual in preliminary sedimentation tank water outlet.
3. reaction tank 5 and second pond 6: by chemical precipitation, removes phosphorus in water, makes water outlet reach emission standard.
(4) removal of SS
SS removes mainly through two-stage settling tank, and BAF 4 serves the crown_interception certain to SS.
A kind of Small Sewage Treatment Equipment provided by the invention is for the sewage disposal of samll cities and towns, and propose the construction mode that integrated apparatus is installed, whole processing unit all adopts device, except ground and device basic, without civil engineering.
A kind of Small Sewage Treatment Equipment provided by the invention, technical process is succinct, and device is installed fast, and the construction period is short; Compared with common process, floor space saves more than 60%; Running cost is low, ton cost of water treatment about 0.4 yuan; Sludge quantity is low, reduces a specific resistance to filtration difficult problem; Simple to operate, need employee few; Energy consumption and medicine consume low; Plant area's sanitary condition is good.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (1)
1. a Small Sewage Treatment Equipment, it is characterized in that: comprise filter-press dehydration device, sludge condensation delivery pipe, the grid be connected with former water water inlet pipe, the lift pump be connected with the water side of described grid, the preliminary sedimentation tank be connected with the water side of described lift pump, the BAF be connected with the water side of described preliminary sedimentation tank, the reaction tank be connected with the water side of described BAF and the second pond be connected with the water side of described reaction tank, described second pond is connected with rising pipe, described preliminary sedimentation tank, second pond is connected with described filter-press dehydration device respectively, described filter-press dehydration device is connected with described sludge condensation delivery pipe, described second pond is arranged on the bottom of described reaction tank, described reaction tank is connected with coagulant dosage mechanism, stirring mechanism is provided with in described reaction tank, described preliminary sedimentation tank is vertical sedimentation basin, the bottom of described preliminary sedimentation tank is provided with storage mud space, described second pond is vertical sedimentation basin, the bottom of described second pond is provided with storage mud space, described second pond, apparatus for ultraviolet disinfection is connected with between rising pipe, described BAF comprises anoxic pond and Aerobic Pond, described anoxic pond and aerobic cell compartment are arranged in series, described former water water inlet pipe, oil separation grit chamber is connected with between grid, the top of described preliminary sedimentation tank is provided with oil removal unit, described grid is fine fack, described BAF is connected with back flushing mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610042880.8A CN105481197A (en) | 2016-01-22 | 2016-01-22 | Small sewage treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610042880.8A CN105481197A (en) | 2016-01-22 | 2016-01-22 | Small sewage treatment device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105481197A true CN105481197A (en) | 2016-04-13 |
Family
ID=55668531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610042880.8A Pending CN105481197A (en) | 2016-01-22 | 2016-01-22 | Small sewage treatment device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105481197A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109231567A (en) * | 2018-10-25 | 2019-01-18 | 陈志� | A kind of chemical plant sewage treatment process |
| WO2023024423A1 (en) * | 2021-08-25 | 2023-03-02 | 江苏裕隆环保有限公司 | Modular domestic sewage treatment apparatus |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09323004A (en) * | 1996-06-04 | 1997-12-16 | Kamata Bio Eng Kk | Water treating apparatus |
| CN202898159U (en) * | 2012-06-01 | 2013-04-24 | 中国石油天然气股份有限公司 | Sewage treatment device |
| CN203728688U (en) * | 2014-03-12 | 2014-07-23 | 娄底首创水务有限责任公司 | Small-size sewage treatment equipment |
-
2016
- 2016-01-22 CN CN201610042880.8A patent/CN105481197A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09323004A (en) * | 1996-06-04 | 1997-12-16 | Kamata Bio Eng Kk | Water treating apparatus |
| CN202898159U (en) * | 2012-06-01 | 2013-04-24 | 中国石油天然气股份有限公司 | Sewage treatment device |
| CN203728688U (en) * | 2014-03-12 | 2014-07-23 | 娄底首创水务有限责任公司 | Small-size sewage treatment equipment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109231567A (en) * | 2018-10-25 | 2019-01-18 | 陈志� | A kind of chemical plant sewage treatment process |
| WO2023024423A1 (en) * | 2021-08-25 | 2023-03-02 | 江苏裕隆环保有限公司 | Modular domestic sewage treatment apparatus |
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Application publication date: 20160413 |
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