CN110158742A - A kind of negative pressure sewage collecting technique - Google Patents
A kind of negative pressure sewage collecting technique Download PDFInfo
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- CN110158742A CN110158742A CN201910436783.0A CN201910436783A CN110158742A CN 110158742 A CN110158742 A CN 110158742A CN 201910436783 A CN201910436783 A CN 201910436783A CN 110158742 A CN110158742 A CN 110158742A
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- Prior art keywords
- negative pressure
- negative
- sewage
- well
- pressure
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Classifications
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F1/00—Methods, systems, or installations for draining-off sewage or storm water
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/04—Pipes or fittings specially adapted to sewers
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/22—Adaptations of pumping plants for lifting sewage
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/40—Protecting water resources
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Sewage (AREA)
Abstract
The invention discloses a kind of negative pressure sewage collecting techniques, comprising the following steps: S1: well is collected in setting: in rural area each household other be respectively provided with a collection well, collect and water inlet line be set on well；S2: setting negative pressure gathering tank: a collecting tank is set, vacuum pump is set in collecting tank, and multiple negative-pressure pipelines are set on vacuum pump, collects and negative pressure mouth is set on well, each negative-pressure pipeline extends in the negative pressure mouth in a collection well；S3: negative-pressure pipeline is laid with: using sawtooth pattern system of laying on the road surface of no gradient, the paving mode of pouch-type vacuum line should be used on the road surface continuously climbed.Practicability of the present invention is good, and seal for pipe joints performance is good, can effectively avoid effluent seepage and rainwater penetrates into phenomenon, and flow velocity is relatively large in sewage conduct, advantageously reduces sewage deposition and clogging, is conducive to the operation and management of sewage collecting pipe network.
Description
Technical field
The present invention relates to sewage collecting technical field more particularly to a kind of negative pressure sewage collecting techniques.
Background technique
In city and resident population dense region, the collection of sewage mostly uses gravity type pipeline collection mode, in building
Sewage flow into outdoor inspection shaft, sewage conduct is laid by certain gradient, and sewage is by gravity along pipeline to sewage lifting
Then well is promoted by pumping plant to sewage treatment facility, to prevent sewage in pipeline from blocking, when pipeline laying is generally required using one
The fixed gradient, therefore, the general buried depth of sewage conduct are relatively deep, and construction investment is high.And in rural area, due to living opposite point
Dissipate, especially rural area topography variation is larger, more than river in the case where, such as rely on traditional gravity pipe line collection mode, pipeline
Need to maintain certain gradient, laying difficulty is larger, and pipeline implementation is more difficult, and some can not be implemented at all, cause much to count village
The random discharging modes that the sewage in the village can only be taken, especially country sewage amount is small, sewage conveying tube road length；
Therefore, sewage flow velocity in drought stream is small in pipeline, and pipeline is easily blocked and leaked seriously, and dry days sewage directly penetrates into ground mostly
Under, it collects less than sewage, and in the rainy day since rainwater penetrates into, sewage overflow is serious, and rural rivers are generally polluted, also tight
Underground water is threatened again, seriously affects ambient enviroment, carrys out larger threat to the health care belt of resident.
Summary of the invention
Technical problems based on background technology, the invention proposes a kind of negative pressure sewage collecting techniques.
A kind of negative pressure sewage collecting technique proposed by the present invention, comprising the following steps:
S1: well is collected in setting: in rural area each household other be respectively provided with a collection well, collect and water inlet line be set on well；
S2: setting negative pressure gathering tank: a collecting tank is set, vacuum pump is set in collecting tank, and be arranged on vacuum pump multiple
Negative-pressure pipeline, collects and negative pressure mouth is arranged on well, and each negative-pressure pipeline extends in the negative pressure mouth in a collection well；
S3: negative-pressure pipeline is laid with: being used sawtooth pattern system of laying on the road surface of no gradient, should be adopted on the road surface continuously climbed
With the paving mode of pouch-type vacuum line；
S4: gas-liquid separation: an outlet conduit is set, and outlet conduit is connected to gas on the negative pressure gathering tank described in S2
In liquid/gas separator, wherein liquid is discharged into cesspool and is collected, and gas drains into air collector by exhaust pipe and concentrated
Processing；
S5: sewage treatment: the sewage transport in the cesspool in S4 to sewage treatment plant is focused on.
Preferably, in the S1, HDPE cover film is first set in collection well and is covered, then in the base of HDPE cover film
HDPE sealing film is pasted on plinth again.
Preferably, in the S2, the quantity of negative-pressure pipeline is set as 40-60.
Preferably, in the S2, the angle that negative-pressure pipeline and negative pressure mouth are formed is 90~180 °.
Preferably, in the S3, two adjacent saw-tooth types promote the conduit slope between curved and are set as 0.2-0.8%, pipeline
Nominal diameter is set as 100-200mm.
Preferably, in the S3, Ying set that U-typed is curved, and pipeline nominal diameter is set as 40-100mm before 45 ° of ascent stages.
Preferably, in the S4, the position on the high liquid level of gas collection tank body is arranged in the high level switch on air collector,
The position on the low liquid level of gas collection tank body is arranged in low liquid level switch on air collector, is opened using low liquid level switch, high liquid level
The signal of pass transmits, the automatically open and close of control valve.
Preferably, in the S5, the height by the way that cesspool is arranged realizes pressure current, to guarantee sewage whole process using pressure
Power is delivered to sewage treatment plant.
Beneficial effects of the present invention:
(1) the sewage gravity in family, which flows to, collects in well, the vacuum pump on collecting tank is periodically turned on, in the feelings that vacuum pump is opened
Under condition, occur negative pressure in collecting tank, collect the sewage in well and collecting tank is flow to by negative tube under the action of negative pressure, draining pump according to
The sewage level of collecting tank periodically turns on, and when the high vacuum that collecting tank negative pressure reaches switchs set highest negative pressure, closes vacuum
Pump, the sewage in collecting tank is imported into gas-liquid separator and carries out gas-liquid separation, is then carried out at classification to exhaust gas and sewage
Reason；
(2) easy for construction, it is suitable for various landform, excavating depth is shallow, reduces excavation cost and the influence to environment, is suitable for old
Housing reform is made, and caliber is smaller, and excavated volume is small, leans on vacuum handling, the 1/5- of conventional drainage systems is only used as with size pipeline gradient
1/8, lifting station is not needed, meeting barrier can easily get around；
(3) since there are negative pressure in vacuum pipe network, therefore run, drip, leak phenomenon is not had, vacuum can transport as power transmission
High concentration excrement, rate is high, will not freeze in vacuum pipe, solve the problems such as common pipe bursting by freezing, blocking.
Practicability of the present invention is good, and seal for pipe joints performance is good, can effectively avoid effluent seepage and rainwater penetrates into phenomenon, sewage pipe
Flow velocity is relatively large in road, advantageously reduces sewage deposition and clogging, is conducive to the operation and management of sewage collecting pipe network.
Specific embodiment
Combined with specific embodiments below the present invention is made further to explain.
Embodiment 1
A kind of negative pressure sewage collecting technique is proposed in the present embodiment, comprising the following steps:
S1: well is collected in setting: in rural area each household other be respectively provided with a collection well, collect and water inlet line be set on well；
S2: setting negative pressure gathering tank: a collecting tank is set, vacuum pump is set in collecting tank, and be arranged on vacuum pump multiple
Negative-pressure pipeline, collects and negative pressure mouth is arranged on well, and each negative-pressure pipeline extends in the negative pressure mouth in a collection well；
S3: negative-pressure pipeline is laid with: being used sawtooth pattern system of laying on the road surface of no gradient, should be adopted on the road surface continuously climbed
With the paving mode of pouch-type vacuum line；
S4: gas-liquid separation: an outlet conduit is set, and outlet conduit is connected to gas-liquid point on the negative pressure gathering tank in S2
From in device, wherein liquid is discharged into cesspool and is collected, and gas drains into air collector by exhaust pipe and focused on；
S5: sewage treatment: the sewage transport in the cesspool in S4 to sewage treatment plant is focused on.
In the present embodiment, in S1, HDPE cover film is first set in collection well and is covered, then in the base of HDPE cover film
HDPE sealing film is pasted on plinth again, in S2, the quantity of negative-pressure pipeline is set as 40, in S2, and negative-pressure pipeline is formed with negative pressure mouth
Angle be 90 °, in S3, two adjacent saw-tooth types promote the conduit slope between curved and are set as 0.2%, and pipeline nominal diameter is set
It is set to 100mm, in S3, Ying set U-typed before 45 ° of ascent stages curved, and pipeline nominal diameter is set as 40mm, in S4, on air collector
High level switch the position on the high liquid level of gas collection tank body is set, low liquid level on air collector switch is arranged in air collector
Position on the low liquid level of body, using low liquid level switch, high level switch signal transmit, the automatic opening of control valve and
It is closed, in S5, the height by the way that cesspool is arranged realizes pressure current, to guarantee that sewage whole process is delivered at sewage using pressure
Manage factory.
Embodiment 2
A kind of negative pressure sewage collecting technique is proposed in the present embodiment, comprising the following steps:
S1: well is collected in setting: in rural area each household other be respectively provided with a collection well, collect and water inlet line be set on well；
S2: setting negative pressure gathering tank: a collecting tank is set, vacuum pump is set in collecting tank, and be arranged on vacuum pump multiple
Negative-pressure pipeline, collects and negative pressure mouth is arranged on well, and each negative-pressure pipeline extends in the negative pressure mouth in a collection well；
S3: negative-pressure pipeline is laid with: being used sawtooth pattern system of laying on the road surface of no gradient, should be adopted on the road surface continuously climbed
With the paving mode of pouch-type vacuum line；
S4: gas-liquid separation: an outlet conduit is set, and outlet conduit is connected to gas-liquid point on the negative pressure gathering tank in S2
From in device, wherein liquid is discharged into cesspool and is collected, and gas drains into air collector by exhaust pipe and focused on；
S5: sewage treatment: the sewage transport in the cesspool in S4 to sewage treatment plant is focused on.
In the present embodiment, in S1, HDPE cover film is first set in collection well and is covered, then in the base of HDPE cover film
HDPE sealing film is pasted on plinth again, in S2, the quantity of negative-pressure pipeline is set as 45, in S2, and negative-pressure pipeline is formed with negative pressure mouth
Angle be 100 °, in S3, two adjacent saw-tooth types promote the conduit slope between curved and are set as 0.3%, and pipeline nominal diameter is set
It is set to 120mm, in S3, Ying set U-typed before 45 ° of ascent stages curved, and pipeline nominal diameter is set as 50mm, in S4, on air collector
High level switch the position on the high liquid level of gas collection tank body is set, low liquid level on air collector switch is arranged in air collector
Position on the low liquid level of body, using low liquid level switch, high level switch signal transmit, the automatic opening of control valve and
It is closed, in S5, the height by the way that cesspool is arranged realizes pressure current, to guarantee that sewage whole process is delivered at sewage using pressure
Manage factory.
Embodiment 3
A kind of negative pressure sewage collecting technique is proposed in the present embodiment, comprising the following steps:
S1: well is collected in setting: in rural area each household other be respectively provided with a collection well, collect and water inlet line be set on well；
S2: setting negative pressure gathering tank: a collecting tank is set, vacuum pump is set in collecting tank, and be arranged on vacuum pump multiple
Negative-pressure pipeline, collects and negative pressure mouth is arranged on well, and each negative-pressure pipeline extends in the negative pressure mouth in a collection well；
S3: negative-pressure pipeline is laid with: being used sawtooth pattern system of laying on the road surface of no gradient, should be adopted on the road surface continuously climbed
With the paving mode of pouch-type vacuum line；
S4: gas-liquid separation: an outlet conduit is set, and outlet conduit is connected to gas-liquid point on the negative pressure gathering tank in S2
From in device, wherein liquid is discharged into cesspool and is collected, and gas drains into air collector by exhaust pipe and focused on；
S5: sewage treatment: the sewage transport in the cesspool in S4 to sewage treatment plant is focused on.
In the present embodiment, in S1, HDPE cover film is first set in collection well and is covered, then in the base of HDPE cover film
HDPE sealing film is pasted on plinth again, in S2, the quantity of negative-pressure pipeline is set as 50, in S2, and negative-pressure pipeline is formed with negative pressure mouth
Angle be 120 °, in S3, two adjacent saw-tooth types promote the conduit slope between curved and are set as 0.5%, and pipeline nominal diameter is set
It is set to 140mm, in S3, Ying set U-typed before 45 ° of ascent stages curved, and pipeline nominal diameter is set as 70mm, in S4, on air collector
High level switch the position on the high liquid level of gas collection tank body is set, low liquid level on air collector switch is arranged in air collector
Position on the low liquid level of body, using low liquid level switch, high level switch signal transmit, the automatic opening of control valve and
It is closed, in S5, the height by the way that cesspool is arranged realizes pressure current, to guarantee that sewage whole process is delivered at sewage using pressure
Manage factory.
Embodiment 4
A kind of negative pressure sewage collecting technique is proposed in the present embodiment, comprising the following steps:
S1: well is collected in setting: in rural area each household other be respectively provided with a collection well, collect and water inlet line be set on well；
S2: setting negative pressure gathering tank: a collecting tank is set, vacuum pump is set in collecting tank, and be arranged on vacuum pump multiple
Negative-pressure pipeline, collects and negative pressure mouth is arranged on well, and each negative-pressure pipeline extends in the negative pressure mouth in a collection well；
S3: negative-pressure pipeline is laid with: being used sawtooth pattern system of laying on the road surface of no gradient, should be adopted on the road surface continuously climbed
With the paving mode of pouch-type vacuum line；
S4: gas-liquid separation: an outlet conduit is set, and outlet conduit is connected to gas-liquid point on the negative pressure gathering tank in S2
From in device, wherein liquid is discharged into cesspool and is collected, and gas drains into air collector by exhaust pipe and focused on；
S5: sewage treatment: the sewage transport in the cesspool in S4 to sewage treatment plant is focused on.
In the present embodiment, in S1, HDPE cover film is first set in collection well and is covered, then in the base of HDPE cover film
HDPE sealing film is pasted on plinth again, in S2, the quantity of negative-pressure pipeline is set as 55, in S2, and negative-pressure pipeline is formed with negative pressure mouth
Angle be 160 °, in S3, two adjacent saw-tooth types promote the conduit slope between curved and are set as 0.7%, and pipeline nominal diameter is set
It is set to 180mm, in S3, Ying set U-typed before 45 ° of ascent stages curved, and pipeline nominal diameter is set as 80mm, in S4, on air collector
High level switch the position on the high liquid level of gas collection tank body is set, low liquid level on air collector switch is arranged in air collector
Position on the low liquid level of body, using low liquid level switch, high level switch signal transmit, the automatic opening of control valve and
It is closed, in S5, the height by the way that cesspool is arranged realizes pressure current, to guarantee that sewage whole process is delivered at sewage using pressure
Manage factory.
Embodiment 5
A kind of negative pressure sewage collecting technique is proposed in the present embodiment, comprising the following steps:
S1: well is collected in setting: in rural area each household other be respectively provided with a collection well, collect and water inlet line be set on well；
S2: setting negative pressure gathering tank: a collecting tank is set, vacuum pump is set in collecting tank, and be arranged on vacuum pump multiple
Negative-pressure pipeline, collects and negative pressure mouth is arranged on well, and each negative-pressure pipeline extends in the negative pressure mouth in a collection well；
S3: negative-pressure pipeline is laid with: being used sawtooth pattern system of laying on the road surface of no gradient, should be adopted on the road surface continuously climbed
With the paving mode of pouch-type vacuum line；
S4: gas-liquid separation: an outlet conduit is set, and outlet conduit is connected to gas-liquid point on the negative pressure gathering tank in S2
From in device, wherein liquid is discharged into cesspool and is collected, and gas drains into air collector by exhaust pipe and focused on；
S5: sewage treatment: the sewage transport in the cesspool in S4 to sewage treatment plant is focused on.
In the present embodiment, in S1, HDPE cover film is first set in collection well and is covered, then in the base of HDPE cover film
HDPE sealing film is pasted on plinth again, in S2, the quantity of negative-pressure pipeline is set as 60, in S2, and negative-pressure pipeline is formed with negative pressure mouth
Angle be 180 °, in S3, two adjacent saw-tooth types promote the conduit slope between curved and are set as 0.8%, and pipeline nominal diameter is set
It is set to 200mm, in S3, Ying set U-typed before 45 ° of ascent stages curved, and pipeline nominal diameter is set as 100mm, in S4, on air collector
High level switch the position on the high liquid level of gas collection tank body is set, low liquid level on air collector switch is arranged in air collector
Position on the low liquid level of body, using low liquid level switch, high level switch signal transmit, the automatic opening of control valve and
It is closed, in S5, the height by the way that cesspool is arranged realizes pressure current, to guarantee that sewage whole process is delivered at sewage using pressure
Manage factory.
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 (8)
1. a kind of negative pressure sewage collecting technique, which comprises the following steps:
S1: well is collected in setting: in rural area each household other be respectively provided with a collection well, collect and water inlet line be set on well；
S2: setting negative pressure gathering tank: a collecting tank is set, vacuum pump is set in collecting tank, and be arranged on vacuum pump multiple
Negative-pressure pipeline, collects and negative pressure mouth is arranged on well, and each negative-pressure pipeline extends in the negative pressure mouth in a collection well；
S3: negative-pressure pipeline is laid with: being used sawtooth pattern system of laying on the road surface of no gradient, should be adopted on the road surface continuously climbed
With the paving mode of pouch-type vacuum line；
S4: gas-liquid separation: an outlet conduit is set, and outlet conduit is connected to gas on the negative pressure gathering tank described in S2
In liquid/gas separator, wherein liquid is discharged into cesspool and is collected, and gas drains into air collector by exhaust pipe and concentrated
Processing；
S5: sewage treatment: the sewage transport in the cesspool in S4 to sewage treatment plant is focused on.
2. a kind of negative pressure sewage collecting technique according to claim 1, which is characterized in that in the S1, collect in well first
Setting HDPE cover film is covered, and then pastes HDPE sealing film again on the basis of HDPE cover film.
3. a kind of negative pressure sewage collecting technique according to claim 1, which is characterized in that in the S2, negative-pressure pipeline
Quantity is set as 40-60.
4. a kind of negative pressure sewage collecting technique according to claim 1, which is characterized in that in the S2, negative-pressure pipeline with
The angle that negative pressure mouth is formed is 90~180 °.
5. a kind of negative pressure sewage collecting technique according to claim 1, which is characterized in that in the S3, two adjacent saws
Flute profile promotes the conduit slope between curved and is set as 0.2-0.8%, and pipeline nominal diameter is set as 100-200mm.
6. a kind of negative pressure sewage collecting technique according to claim 1, which is characterized in that in the S3,45 ° of Ying risings
Duan Qianshe U-typed is curved, and pipeline nominal diameter is set as 40-100mm.
7. a kind of negative pressure sewage collecting technique according to claim 1, which is characterized in that in the S4, on air collector
The position on the high liquid level of gas collection tank body is arranged in high level switch, and the low liquid level switch on air collector is arranged in gas collection tank body
Low liquid level on position, transmitted, the automatic opening of control valve and closed using the signal of low liquid level switch, high level switch
It closes.
8. a kind of negative pressure sewage collecting technique according to claim 1, which is characterized in that dirty by setting in the S5
The height in pond realizes pressure current, to guarantee that sewage whole process is delivered to sewage treatment plant using pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910436783.0A CN110158742A (en) | 2019-05-24 | 2019-05-24 | A kind of negative pressure sewage collecting technique |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910436783.0A CN110158742A (en) | 2019-05-24 | 2019-05-24 | A kind of negative pressure sewage collecting technique |
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| CN110158742A true CN110158742A (en) | 2019-08-23 |
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| CN201910436783.0A Pending CN110158742A (en) | 2019-05-24 | 2019-05-24 | A kind of negative pressure sewage collecting technique |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112113619A (en) * | 2020-09-25 | 2020-12-22 | 安徽大学 | Experimental device for verifying sewage collecting effect of negative pressure pipeline |
| CN114673234A (en) * | 2022-04-08 | 2022-06-28 | 合肥工业大学 | Negative pressure collecting method for rural sewage |
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| CN2663548Y (en) * | 2003-10-20 | 2004-12-15 | 陈均 | Negative pressure gathering tank |
| CN101275405A (en) * | 2007-03-26 | 2008-10-01 | 东亚联合控股（集团）有限公司 | Vacuum drainage system |
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| CN109455894A (en) * | 2018-12-29 | 2019-03-12 | 徐曼 | Rural toilet septic tank liquid manure and peasant household's sewage negative pressure collection system |
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2019
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| DE69000872T2 (en) * | 1989-11-30 | 1993-08-19 | Ebara Corp | DEVICE FOR CONTROLLING A VACUUM PUMP FOR A WASTE WATER COLLECTION AND EVACUATION SYSTEM. |
| CN2663548Y (en) * | 2003-10-20 | 2004-12-15 | 陈均 | Negative pressure gathering tank |
| CN101275405A (en) * | 2007-03-26 | 2008-10-01 | 东亚联合控股（集团）有限公司 | Vacuum drainage system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112113619A (en) * | 2020-09-25 | 2020-12-22 | 安徽大学 | Experimental device for verifying sewage collecting effect of negative pressure pipeline |
| CN114673234A (en) * | 2022-04-08 | 2022-06-28 | 合肥工业大学 | Negative pressure collecting method for rural sewage |
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Application publication date: 20190823 |