CN110436683A - A kind of middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns - Google Patents
A kind of middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns Download PDFInfo
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- CN110436683A CN110436683A CN201910700870.2A CN201910700870A CN110436683A CN 110436683 A CN110436683 A CN 110436683A CN 201910700870 A CN201910700870 A CN 201910700870A CN 110436683 A CN110436683 A CN 110436683A
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Links
- 239000010865 sewage Substances 0.000 title claims abstract description 21
- 230000010354 integration Effects 0.000 title claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 48
- 238000005345 coagulation Methods 0.000 claims abstract description 35
- 230000015271 coagulation Effects 0.000 claims abstract description 35
- 239000004576 sand Substances 0.000 claims abstract description 27
- 238000004062 sedimentation Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000005189 flocculation Methods 0.000 claims abstract description 20
- 230000016615 flocculation Effects 0.000 claims abstract description 20
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 239000010802 sludge Substances 0.000 claims abstract description 6
- 238000009825 accumulation Methods 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 26
- 238000001556 precipitation Methods 0.000 claims description 14
- 239000000706 filtrate Substances 0.000 claims description 12
- 239000006004 Quartz sand Substances 0.000 claims description 4
- 238000009287 sand filtration Methods 0.000 claims description 4
- 239000003245 coal Substances 0.000 claims description 3
- 150000002118 epoxides Chemical class 0.000 claims description 3
- 239000003755 preservative agent Substances 0.000 claims description 3
- 230000002335 preservative effect Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 230000005484 gravity Effects 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000033001 locomotion Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004065 wastewater treatment 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
- C02F1/001—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
-
- 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
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)
- Filtration Of Liquid (AREA)
Abstract
The invention proposes a kind of middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns, including cabinet, flocculation stirring pond, level-one coagulation stirring pool, two-stage coagulation stirring pool, sedimentation basin and sand filter are equipped in cabinet；Flocculation stirring pond, level-one coagulation stirring pool, two-stage coagulation stirring pool are sequentially communicated；The guide shell being vertically arranged is equipped in sedimentation basin, guide shell top is equipped with the connecting tube being connected to two-stage coagulation stirring pool and its open bottom end, and cabinet bottom end is equipped with the sludge discharging pipe being connected to sedimentation basin；Sand filter top is equipped with the overflow effluent weir being connected to sedimentation basin, it is located at overflow effluent weir lower position in sand filter and is equipped with horizontally disposed filter plate, accumulation on multiple filter openings and filter plate is distributed on filter plate filtering layer, is located at filter plate lower position on cabinet and is equipped with the outlet pipe being connected to sand filter.The present invention can adjust size according to processing water size, and occupied area is small；Sand filter is intake using no pressure type gravity stream, has lacked a power transmission.
Description
Technical field
The present invention relates to the middle-size and small-size scale sanitary sewage integration depth of water-treatment technology field more particularly to a kind of villages and small towns
Processing unit.
Background technique
Villages and small towns Sewage Treatment Project increases increasingly in recent years, and mostly ppp project.Villages and small towns sewage is mainly characterized by pollutant
Concentration is lower, and water is smaller, and station design scale is mostly 50m3/d -500m3/d.Small-scale station is mostly used with A2/O technique
For leading Integral steel equipment.But in actual operation, conventional integration apparatus can not accomplish stably reaching standard, especially
It is TP and SS index.This just needs to increase advanced treatment device in biochemical reaction equipment rear end to ensure that water quality reaching standard discharges.
But since often structure is complicated for traditional advanced treatment device, and mostly pressure type intake design, so that fortune
Row energy consumption increases, and improves operating cost, generates large effect to the returns of investment of ppp project investment company.
Summary of the invention
Based on technical problem present in background technique, the invention proposes a kind of middle-size and small-size scale sanitary sewages one in villages and small towns
Body advanced treatment apparatus
The middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in a kind of villages and small towns proposed by the present invention, including cabinet, case
It is equipped with flocculation stirring pond, level-one coagulation stirring pool, two-stage coagulation stirring pool, sedimentation basin and sand filter in vivo；
Flocculation stirring pond, level-one coagulation stirring pool, two-stage coagulation stirring pool is sequentially communicated and flocculation stirring pond, level-one coagulation
Flocculation stirring device, level-one coagulation agitating device, two-stage coagulation stirring dress are respectively equipped in stirring pool, two-stage coagulation stirring pool
It sets, wall box top is equipped with the water inlet pipe being connected to flocculation stirring pond；
The guide shell being vertically arranged is equipped in sedimentation basin, guide shell top is equipped with the connection being connected to two-stage coagulation stirring pool
Pipe and its open bottom end, cabinet bottom end are equipped with the sludge discharging pipe being connected to sedimentation basin；
Sand filter top is equipped with the overflow effluent weir being connected to sedimentation basin, is located at overflow effluent weir lower position in sand filter
Equipped with horizontally disposed filter plate, accumulation on multiple filter openings and filter plate is distributed on filter plate filtering layer, is located at below filter plate on cabinet
Position is equipped with the outlet pipe being connected to sand filter.
Preferably, the precipitation bucket in sedimentation basin below guide shell, precipitation bucket are in back taper, and sludge discharging pipe and heavy
The bucket that forms sediment is connected to.
Preferably, guide shell is connect by bracket with cabinet wall, and guide shell bottom end is protruded into precipitation bucket and its bottom is set
There is flaring, and the flaring bottom is connected with Reflecting pyramid.
Preferably, cabinet bottom end is located at filter plate lower position equipped with the backwash water inlet pipe and backwash air inlet being connected to sand filter
Pipe, cabinet top are equipped with the backwash outlet pipe for protruding into and being connected in sand filter with overflow effluent weir.
Preferably, precipitation bucket top position is located in sedimentation basin to set there are two mounting rack, two mounting racks arrange up and down and
Multiple inclined tubes around guide shell arrangement are distributed between two mounting racks.
Preferably, filtering layer is removable is mounted on filter plate.
Preferably, filtering layer includes first layer arranged up and down, the second layer, third layer, and first layer is 0.8-1.2mm by partial size
Filtrate composition and first layer with a thickness of 500mm, the second layer be made of the filtrate that partial size is 2-4mm and the second layer with a thickness of
100mm, third layer is made of the filtrate that partial size is 5-10mm and third layer is with a thickness of 100mm.
Preferably, filtrate uses quartz sand or sea sand.
Preferably, epoxide coal bituminous preservative treatment is all made of inside and outside cabinet.
The middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in a kind of villages and small towns proposed by the present invention, can be according to processing
Water size adjusts size, makes, convenient and flexible installation, and occupied area is small；According to equipment choosing material and anticorrosion process, equipment
Longer service life can be obtained, main structure can achieve 15-20 or more；Device systems include flocculation stirring, coagulation
Precipitating and three processing units of sand filtration, process unit efficient；Sand filtration unit is filtered using gravity stream without pressure type, energy consumption
It is low, save operating cost；Agitating device, chemicals dosing plant and air backwashing system in the present invention can be according to actual motions
In water quality situation determine the need for opening, therefore can be used as stand-by provision to further decreasing energy consumption；The present invention and often
The pressure type filtering container of rule is compared, and sand filter of the present invention is intake using no pressure type gravity stream, has lacked a power transmission,
Energy consumption is greatly reduced, operating cost is reduced, it can be ensured that water quality standard water discharge, for the operational effect and income of unit of operation
With very real meaning.
Detailed description of the invention
Fig. 1 is that a kind of structure of the middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns proposed by the present invention is shown
It is intended to；
Fig. 2 be in Fig. 1 A to structural schematic diagram；
Fig. 3 is B-B direction structural schematic diagram in Fig. 1；
Fig. 4 be in Fig. 1 C-C to structural schematic diagram；
Fig. 5 be in Fig. 1 D-D to structural schematic diagram；
Fig. 6 is a kind of work of the middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns proposed by the present invention
Flow chart.
Specific embodiment
- Fig. 5 referring to Fig.1, the present invention propose a kind of middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns, packet
Cabinet 1 is included, is equipped with flocculation stirring pond 2, level-one coagulation stirring pool 3, two-stage coagulation stirring pool 4, sedimentation basin 5 and sand filtration in cabinet 1
Pond 6；
Flocculation stirring pond 2, level-one coagulation stirring pool 3, two-stage coagulation stirring pool 4 is sequentially communicated and flocculation stirring pond 2, level-one
Flocculation stirring device 7, level-one coagulation agitating device 8, two-stage coagulation are respectively equipped in coagulation stirring pool 3, two-stage coagulation stirring pool 4
Agitating device 9,1 side wall top of cabinet are equipped with the water inlet pipe 10 being connected to flocculation stirring pond 2.
The guide shell 11 being vertically arranged and the precipitation bucket 18 positioned at 11 lower section of guide shell are equipped in sedimentation basin 5.Guide shell
11 are connect by bracket with 1 inner wall of cabinet, and 11 top of guide shell is equipped with the connecting tube being connected to two-stage coagulation stirring pool 4, water conservancy diversion
11 bottom ends of cylinder are protruded into precipitation bucket 18 and its bottom is equipped with flaring, and the flaring bottom is connected with Reflecting pyramid 19.Precipitation bucket 18
In back taper, and 1 bottom end of cabinet is equipped with the sludge discharging pipe 12 being connected to precipitation bucket 18.
6 top of sand filter is equipped with the overflow effluent weir 13 being connected to sedimentation basin 5, is located at overflow effluent weir 13 in sand filter 6
Lower position is equipped with horizontally disposed filter plate 14, and accumulation on multiple filter openings 15 and filter plate 14 is distributed on filter plate 14 filtering layer 16,
It is located at 14 lower position of filter plate on cabinet 1 and is equipped with the outlet pipe 17 being connected to sand filter 6.
In the present embodiment, 1 bottom end of cabinet is located at 14 lower position of filter plate and is equipped with the backwash water inlet pipe 20 being connected to sand filter 6
With backwash air inlet pipe 21,1 top of cabinet is equipped with the backwash outlet pipe 22 for protruding into and being connected in sand filter 6 with overflow effluent weir 13.
It is located at 18 top position of precipitation bucket in the present embodiment, in sedimentation basin 5 to set there are two mounting rack, above and below two mounting racks
Multiple inclined tubes 23 arranged around guide shell 11 are distributed between arrangement and two mounting racks, to precipitate suspended matter.
In the present embodiment, filtering layer 16 is removable to be mounted on filter plate 14, and filtering layer 16 includes first layer arranged up and down, second
Layer, third layer, first layer is made of the filtrate that partial size is 0.8-1.2mm and first layer is with a thickness of 500mm, and the second layer is by partial size
The filtrate of 2-4mm forms and the second layer is with a thickness of 100mm, and third layer is made of the filtrate that partial size is 5-10mm and third layer thickness
For 100mm, filtrate uses quartz sand or sea sand.
In the present embodiment, epoxide coal bituminous preservative treatment is all made of inside and outside cabinet 1.According to equipment choosing material and prevent
Rotten technique, equipment can obtain longer service life, and main structure can achieve 15-20 or more.
Referring to Fig. 6, when the invention works, the secondary clarifier effluent of biochemical wastewater treatment unit is mentioned by pump or is flow automatically into dress
It sets, first flows through flocculation stirring pond 2, add flocculation medicament herein and be sufficiently mixed；Then flow through level-one coagulation stirring pool 3, second level
Coagulation stirring pool 4 adds coagulated agent herein and forms wadding body；Mud-water separation is carried out subsequently into sedimentation basin 5, clear water passes through overflow
Effluent weir 13 is to sand filter 6；Water quality is promoted using the filtration of gradation quartz sand or sea sand filtering layer, 16 lower end of filtering layer is embedded with
Water collector, filtered sewage flow out equipment box after being collected by water collector, the outlet after ultraviolet disinfection.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (9)
1. a kind of middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns, which is characterized in that including cabinet (1), case
Flocculation stirring pond (2), level-one coagulation stirring pool (3), two-stage coagulation stirring pool (4), sedimentation basin (5) and sand filtration are equipped in body (1)
Pond (6)；
Flocculation stirring pond (2), level-one coagulation stirring pool (3), two-stage coagulation stirring pool (4) is sequentially communicated and flocculation stirring pond (2),
Flocculation stirring device (7), level-one coagulation agitating device are respectively equipped in level-one coagulation stirring pool (3), two-stage coagulation stirring pool (4)
(8), two-stage coagulation agitating device (9), cabinet (1) side wall top are equipped with the water inlet pipe (10) being connected to flocculation stirring pond (2)；
The guide shell (11) being vertically arranged is equipped in sedimentation basin (5), guide shell (11) top is equipped with and two-stage coagulation stirring pool (4)
The connecting tube of connection and its open bottom end, cabinet (1) bottom end are equipped with the sludge discharging pipe (12) being connected to sedimentation basin (5)；
Sand filter (6) top is equipped with the overflow effluent weir (13) being connected to sedimentation basin (5), is located at overflow in sand filter (6) and is discharged
Weir (13) lower position is equipped with horizontally disposed filter plate (14), is distributed on multiple filter openings (15) and filter plate (14) on filter plate (14)
Accumulation has filtering layer (16), and filter plate (14) lower position is located on cabinet (1) and is equipped with the outlet pipe (17) being connected to sand filter (6).
2. the middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns according to claim 1, which is characterized in that
Precipitation bucket (18) in sedimentation basin (5) below guide shell (11), precipitation bucket (18) are in back taper, and sludge discharging pipe (12)
It is connected to precipitation bucket (18).
3. the middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns according to claim 2, which is characterized in that
Guide shell (11) is connect by bracket with cabinet (1) inner wall, and guide shell (11) bottom end is protruded into precipitation bucket (18) and its bottom is set
There is flaring, and the flaring bottom is connected with Reflecting pyramid (19).
4. the middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns according to any one of claim 1-3,
It is characterized in that, cabinet (1) bottom end, which is located at filter plate (14) lower position, is equipped with the backwash water inlet pipe (20) being connected to sand filter (6)
With backwash air inlet pipe (21), cabinet (1) top is equipped with the backwash water outlet protruded into and be connected in sand filter (6) with overflow effluent weir (13)
It manages (22).
5. the middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns according to any one of claim 1-3,
It sets it is characterized in that, being located at precipitation bucket (18) top position in sedimentation basin (5) there are two mounting rack, two mounting racks are arranged up and down
And multiple inclined tubes (23) around guide shell (11) arrangement are distributed between two mounting racks.
6. the middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns according to any one of claim 1-3,
It is mounted on filter plate (14) it is characterized in that, filtering layer (16) is removable.
7. the middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns according to any one of claim 1-3,
It is characterized in that, filtering layer (16) includes first layer arranged up and down, the second layer, third layer, first layer is 0.8-1.2mm by partial size
Filtrate composition and first layer with a thickness of 500mm, the second layer be made of the filtrate that partial size is 2-4mm and the second layer with a thickness of
100mm, third layer is made of the filtrate that partial size is 5-10mm and third layer is with a thickness of 100mm.
8. the middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns according to claim 7, which is characterized in that
Filtrate uses quartz sand or sea sand.
9. the middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns according to any one of claim 1-3,
It is characterized in that, being all made of epoxide coal bituminous preservative treatment inside and outside cabinet (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910700870.2A CN110436683A (en) | 2019-07-31 | 2019-07-31 | A kind of middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910700870.2A CN110436683A (en) | 2019-07-31 | 2019-07-31 | A kind of middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110436683A true CN110436683A (en) | 2019-11-12 |
Family
ID=68432430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910700870.2A Pending CN110436683A (en) | 2019-07-31 | 2019-07-31 | A kind of middle-size and small-size scale sanitary sewage integration advanced treatment apparatus in villages and small towns |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104193036A (en) * | 2014-09-15 | 2014-12-10 | 山东源宝环保装备有限公司 | Pipe chute sedimentation filtration integrated machine |
| CN105884072A (en) * | 2014-11-05 | 2016-08-24 | 天津创清环保科技有限公司 | Non-overflow dual filter material layer type integral water purification equipment |
| CN207330468U (en) * | 2017-10-24 | 2018-05-08 | 深圳市正强混凝土有限公司 | A kind of integration concrete mixing plant detention tank |
| CN207862063U (en) * | 2018-01-15 | 2018-09-14 | 西安西热水务环保有限公司 | A kind of integration coal water process high density clarifier |
| CN209081600U (en) * | 2018-10-18 | 2019-07-09 | 河北洁之源水处理技术有限公司 | A kind of flocculation sedimentation filtering integral device |
| CN210736421U (en) * | 2019-07-31 | 2020-06-12 | 安徽环境科技集团股份有限公司 | Integrated advanced treatment device for small and medium-scale domestic sewage in villages and small towns |
-
2019
- 2019-07-31 CN CN201910700870.2A patent/CN110436683A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104193036A (en) * | 2014-09-15 | 2014-12-10 | 山东源宝环保装备有限公司 | Pipe chute sedimentation filtration integrated machine |
| CN105884072A (en) * | 2014-11-05 | 2016-08-24 | 天津创清环保科技有限公司 | Non-overflow dual filter material layer type integral water purification equipment |
| CN207330468U (en) * | 2017-10-24 | 2018-05-08 | 深圳市正强混凝土有限公司 | A kind of integration concrete mixing plant detention tank |
| CN207862063U (en) * | 2018-01-15 | 2018-09-14 | 西安西热水务环保有限公司 | A kind of integration coal water process high density clarifier |
| CN209081600U (en) * | 2018-10-18 | 2019-07-09 | 河北洁之源水处理技术有限公司 | A kind of flocculation sedimentation filtering integral device |
| CN210736421U (en) * | 2019-07-31 | 2020-06-12 | 安徽环境科技集团股份有限公司 | Integrated advanced treatment device for small and medium-scale domestic sewage in villages and small towns |
Non-Patent Citations (1)
| Title |
|---|
| 黄维菊等: "污水处理工程设计", 国防工业出版社, pages: 62 - 63 * |
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