CN110697941A - Sewage treatment system and method - Google Patents
Sewage treatment system and method Download PDFInfo
- Publication number
- CN110697941A CN110697941A CN201911131843.4A CN201911131843A CN110697941A CN 110697941 A CN110697941 A CN 110697941A CN 201911131843 A CN201911131843 A CN 201911131843A CN 110697941 A CN110697941 A CN 110697941A
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- Prior art keywords
- water
- tank
- sewage
- pipeline
- aeration tank
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- 239000010865 sewage Substances 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 169
- 238000005273 aeration Methods 0.000 claims abstract description 67
- 238000001035 drying Methods 0.000 claims abstract description 61
- 238000001914 filtration Methods 0.000 claims abstract description 52
- 239000000126 substance Substances 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 238000004065 wastewater treatment Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 5
- 239000002351 wastewater Substances 0.000 claims description 3
- 239000010802 sludge Substances 0.000 abstract description 11
- 239000002912 waste gas Substances 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 229940079593 drug Drugs 0.000 abstract 1
- 239000003814 drug Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 19
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Images
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
-
- 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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)
- Treatment Of Sludge (AREA)
- Activated Sludge Processes (AREA)
Abstract
A sewage treatment system and a method thereof, wherein the sewage treatment system comprises a sewage tank, an aeration tank, a filtering device, a drying device and a water tank; the water inlet of the sewage pool is communicated with an external sewage pipeline; the water outlet of the sewage tank is communicated with the water inlet of the aeration tank, and the aeration tank is used for enabling sewage to be fully subjected to chemical reaction after chemical medicines are added into the aeration tank and aerated; the water outlet of the aeration tank is communicated with the water inlet of the filtering equipment, and the filtering equipment is used for filtering the water treated by the aeration tank; the drying equipment is used for drying filter residues generated after the filtration by the filtering equipment; an air outlet of the drying equipment is communicated with an air inlet of the water tank, so that air generated by the drying equipment during drying is filtered by water in the water tank and then discharged; the water outlet of the water tank is communicated with the water inlet of the sewage pool. The sewage treatment system and the method provided by the invention reduce the outward discharge of sewage, sludge and waste gas as much as possible and greatly improve the environmental protection performance.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a sewage treatment system and method.
Background
At present, the problem of water pollution is becoming more serious, so that sewage treatment is receiving more and more attention. The existing sewage treatment modes comprise a physical precipitation method, a chemical precipitation method, a biological degradation method and the like. However, when the sewage is treated according to the existing sewage treatment method, although the treated water quality generally reaches the standard, a large amount of sludge or waste gas may be generated in the treatment process, wherein the sludge is difficult to treat, and the emission of the waste gas causes air pollution.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a sewage treatment system and method, which can fully utilize the condensed water of a factory and the heat energy therein, and reduce the waste of energy and water resources.
In order to achieve the purpose, the invention adopts the technical scheme that: a sewage treatment system comprises a sewage tank, an aeration tank, a filtering device, a drying device and a water tank;
the water inlet of the sewage pool is communicated with an external sewage pipeline;
the water outlet of the sewage tank is communicated with the water inlet of the aeration tank, and the aeration tank is used for enabling sewage to be fully subjected to chemical reaction after chemicals are added into the aeration tank and aerated;
the water outlet of the aeration tank is communicated with the water inlet of the filtering device, and the filtering device is used for filtering the water treated by the aeration tank;
the drying equipment is used for drying filter residues generated after the filtration of the filtering equipment;
an air outlet of the drying equipment is communicated with an air inlet of the water tank, so that air generated by the drying equipment during drying is filtered by water in the water tank and then exhausted;
and the water outlet of the water tank is communicated with the water inlet of the sewage pool.
In some embodiments, the water outlet of the sewage tank is communicated with the water inlet of the aeration tank through a first pipeline;
the water outlet of the aeration tank is communicated with the water inlet of the filtering equipment through a second pipeline;
a water outlet of the filtering equipment is connected to an external water path through a third pipeline;
the water outlet of the water tank is communicated with the water inlet of the sewage pool through a fourth pipeline;
all be provided with the valve on first pipeline, second pipeline, third pipeline and the fourth pipeline, just all be provided with the water pump on first pipeline, second pipeline and the third pipeline.
In some embodiments, a conveyor is provided between the filtering device and the drying device, and the filter residue generated by the filtering device is conveyed to the drying device by the conveyor.
In some embodiments, a suction fan is disposed on an air path between an air outlet of the drying apparatus and an air inlet of the water tank, and air generated by the drying apparatus during drying is sucked into the water tank through the suction fan.
In some embodiments, the aeration tank further comprises an air compressor or a blower, and an exhaust pipe of the air compressor or the blower extends into the aeration tank and is used for sending gas into the aeration tank to realize blast aeration.
In another aspect, the present invention provides a method for treating wastewater, comprising the steps of:
s1, sending the sewage in the sewage tank into an aeration tank, adding chemicals into the sewage in the aeration tank and aerating to ensure that the sewage in the aeration tank fully undergoes chemical reaction;
s2, sending the water treated in the aeration tank into a filtering device to obtain filtered water and filter residues;
s3, sending the filter residue obtained in the step S2 into a drying device for drying to obtain dried filter residue;
and S4, sending the gas generated in the step S3 when the drying equipment is used for drying into a water tank, filtering the water in the water tank and then discharging the filtered water.
In some embodiments, in step S1, air is fed into the aeration tank by an air compressor or blower to achieve blast aeration.
In some embodiments, in step S2, the filtered water is detected, and if the water quality is acceptable, the filtered water is directly discharged, and if the water quality is not acceptable, the filtered water is sent to a sewage treatment plant for secondary treatment.
In some embodiments, the residue is transported to a drying facility by a conveyor, and the dried residue is sent to a treatment plant for treatment in step S3.
In some embodiments, after step S4, the method further includes the steps of: and sending the water in the water tank into a sewage tank, and adding clean water into the water tank.
Compared with the prior art, the invention has the advantages that: according to the sewage treatment system and method provided by the invention, chemicals are added into sewage, aeration is carried out, and then filtration is carried out, so that treated sewage is obtained; meanwhile, the sludge (filter residue) obtained by filtering is dried by drying equipment, and the dried sludge is convenient to treat; and the gas generated in the drying process is filtered by water and then discharged, so that the gas can be discharged after reaching the standard. Therefore, the sewage treatment system and the method provided by the invention reduce the outward discharge of sewage, sludge and waste gas as much as possible and greatly improve the environmental protection performance.
Drawings
Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.
FIG. 1 is a schematic view of a sewage treatment system provided by the present invention;
FIG. 2 is a flow chart of a wastewater treatment method provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs.
Referring to fig. 1, the sewage treatment system provided by the present invention includes a sewage tank 1, an aeration tank 2, a filtering apparatus 3, a drying apparatus 4, and a water tank 5. The water inlet of the sewage pool 1 is communicated with an external sewage pipeline; the water outlet of the sewage tank 1 is communicated with the water inlet of the aeration tank 2, and the aeration tank 2 is used for enabling sewage to be fully subjected to chemical reaction after chemicals are added into the aeration tank 2 and aerated; a water outlet of the aeration tank 2 is communicated with a water inlet of the filtering device 3, and the filtering device 3 is used for filtering the water treated by the aeration tank 2; the drying device 4 is used for drying filter residues generated after filtering by the filtering device 3; an air outlet of the drying equipment 4 is communicated with an air inlet of the water tank 5, so that air generated by the drying equipment 4 during drying is filtered by water in the water tank 5 and then exhausted; the water outlet of the water tank 5 is communicated with the water inlet of the sewage tank 1.
Specifically, a water outlet of the sewage tank 1 is communicated with a water inlet of the aeration tank 2 through a first pipeline 11; the water outlet of the aeration tank 2 is communicated with the water inlet of the filtering device 3 through a second pipeline 12; the water outlet of the filtering device 3 is connected to an external water path through a third pipeline 13; the water outlet of the water tank 5 is communicated with the water inlet of the sewage tank 1 through a fourth pipeline 14.
It will be understood that the above-mentioned pipes only indicate water passages between different locations, and are not necessarily a single pipe, but may be a combination of a plurality of pipes, for example, the second pipe 12 shown in fig. 1 includes two sets of pipes, so that the water in the aeration tank 2 flows into the filtering device 3.
Further, the first pipeline 11, the second pipeline 12, the third pipeline 13 and the fourth pipeline 14 are all provided with valves 7, and each pipeline can be disconnected by closing the corresponding valve 7. And the first pipeline 11, the second pipeline 12 and the third pipeline 13 are all provided with water pumps 6 to pump water into the equipment at the rear end. In addition, the water tank 5 is preferably set at a high position because it needs to be drained, and the water in the water tank can flow into the wastewater tank 1 under the action of gravity by opening the valve of the fourth pipeline 14 without arranging a water pump on the fourth pipeline 14.
Preferably, a conveyor 8 is arranged between the filtering device 3 and the drying device 4, and filter residues generated by the filtering device 3 are conveyed to the drying device 4 through the conveyor 8; a suction fan 9 is arranged on an air path between an exhaust port of the drying equipment 4 and an air inlet of the water tank 5, and air generated by the drying equipment 4 during drying is sucked into the water tank 5 through the suction fan 9.
Preferably, the sewage treatment system further comprises an air compressor or blower (not shown in the figure), and an exhaust pipe of the air compressor or blower extends into the aeration tank 2 and is used for sending gas into the aeration tank 2 to realize air blast aeration.
Referring to fig. 2, another aspect of the present invention provides a sewage treatment method, including the steps of:
s1, sending the sewage in the sewage tank 1 into the aeration tank 2, adding chemicals into the sewage in the aeration tank 2 and aerating to ensure that the sewage in the aeration tank 2 fully undergoes chemical reaction;
s2, sending the water treated in the aeration tank 2 into a filtering device 3 to obtain filtered water and filter residues;
s3, sending the filter residue obtained in the step S2 into a drying device 4 for drying to obtain dried filter residue;
and S4, sending the gas generated in the step S3 when the drying device 4 dries into the water tank 5, filtering the gas by the water in the water tank 5, and then discharging the filtered gas.
Preferably, in step S1, air is fed into the aeration tank 2 by an air compressor or blower to achieve blast aeration. And step S2, detecting the filtered water, directly discharging the water if the water quality is qualified, and sending the water to a sewage treatment plant for secondary treatment if the water quality is unqualified. The method is characterized in that in step S3, filter residue is conveyed to a drying device through a conveyor 6, and the dried filter residue is conveyed to a treatment plant for treatment. After step S4, the method further includes the steps of: the water in the water tank 5 is sent into the sewage tank 1, and then the clean water is added into the water tank 5.
The detailed workflow of the sewage treatment system in one embodiment, that is, the detailed steps of the sewage treatment method, is described below.
The sewage treatment system can be applied to factories to treat industrial sewage. Sewage generated in industrial production flows into the sewage tank 1 through a pipeline, a valve 7 and a water pump 6 on a first pipeline 11 are opened, and the sewage in the sewage tank 1 is pumped into the aeration tank 2.
Next, chemicals are added into the aeration tank 2, the type and dosage of the chemicals can be adjusted according to the actual pollutant category, and common chemicals for treating sewage include sulfuric acid, ferrous sulfate, hydrogen peroxide and the like; meanwhile, the blower is turned on to send the gas into the aeration tank 2 to realize blast aeration, so that the chemical reaction in the aeration tank 2 is fully completed, most pollutants can be converted into harmless substances or solid substances, and the fixed substances in the water cannot be precipitated due to the blast of the blower.
After the aeration is finished, the valve 7 and the water pump 6 on the second pipeline 12 are opened, so that the water in the aeration tank 2 flows into the filtering device 3 for filtering, and the filtering device 3 can be a filter press;
and after the filtration is finished, opening the valve 7 and the water pump 6 on the third pipeline 13, sending the filtered water into an external water tank, after the water quality detection, directly discharging the water in the external water tank if the water quality is qualified, and sending the water to a sewage treatment plant for secondary treatment if the water quality is still unqualified.
The filter residue which is still obtained by filtering and stays on the filter cloth is conveyed into the drying equipment 4 through the conveyor 8, the dried sludge is obtained after high-temperature drying in the drying equipment 4, and the dried sludge (filter residue) can be collected and then conveyed to a special treatment plant for treatment.
Gas is generated in the drying process, smoke dust can be carried in the gas, and pollution can be generated if the gas is directly discharged; in the embodiment, the gas generated in the drying process is sucked into the water tank 5 through the suction fan 9, so that the gas is filtered by the water in the water tank 5 and then discharged; after the treatment, most of the smoke dust in the gas can be remained in the water tank 5, and the discharged gas reaches the discharge standard and can be directly discharged.
It can be understood that the water in the water tank 5 becomes turbid gradually after a large amount of gas is filtered, at this time, the valve 7 on the fourth pipeline is opened, so that the turbid water in the water tank 5 flows into the sewage tank 1 for treatment, and then the clear water is added into the water tank 5 again.
In summary, the sewage treatment system and method provided by the invention can obtain treated sewage by adding chemicals into sewage, aerating, and filtering; meanwhile, the sludge (filter residue) obtained by filtering is dried by drying equipment, and the dried sludge is convenient to treat; gas generated in the drying process is filtered by water in the water tank and then discharged, so that the gas can be discharged after reaching the standard; the water in the water tank becomes turbid and can be sent back to the sewage tank for treatment. Therefore, the sewage treatment system and the method provided by the invention reduce the outward discharge of sewage, sludge and waste gas as much as possible and greatly improve the environmental protection performance.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A sewage treatment system is characterized by comprising a sewage tank (1), an aeration tank (2), a filtering device (3), a drying device (4) and a water tank (5);
the water inlet of the sewage pool (1) is communicated with an external sewage pipeline;
the water outlet of the sewage tank (1) is communicated with the water inlet of the aeration tank (2), and the aeration tank (2) is used for enabling sewage to fully generate chemical reaction after chemicals are added into the aeration tank (2) and aerated;
the water outlet of the aeration tank (2) is communicated with the water inlet of the filtering device (3), and the filtering device (3) is used for filtering the water treated by the aeration tank (2);
the drying equipment (4) is used for drying filter residues generated after filtration by the filtering equipment (3);
an air outlet of the drying equipment (4) is communicated with an air inlet of the water tank (5) and is used for enabling air generated by the drying equipment (4) during drying to be filtered by water in the water tank (5) and then discharged;
the water outlet of the water tank (5) is communicated with the water inlet of the sewage pool (1).
2. The wastewater treatment system according to claim 1, characterized in that the water outlet of the wastewater tank (1) is communicated with the water inlet of the aeration tank (2) through a first pipeline (11);
the water outlet of the aeration tank (2) is communicated with the water inlet of the filtering equipment (3) through a second pipeline (12);
the water outlet of the filtering device (3) is connected to an external water pool through a third pipeline (13);
the water outlet of the water tank (5) is communicated with the water inlet of the sewage pool (1) through a fourth pipeline (14);
valves (7) are arranged on the first pipeline (11), the second pipeline (12), the third pipeline (13) and the fourth pipeline (14), and water pumps (6) are arranged on the first pipeline (11), the second pipeline (12) and the third pipeline (13).
3. Sewage treatment system according to claim 1, characterised in that a conveyor (8) is arranged between the filtering device (3) and the drying device (4), and that the filter residue produced by the filtering device (3) is transported to the drying device (4) by means of the conveyor (8).
4. The wastewater treatment system according to claim 1, wherein a suction fan (9) is disposed in the air path between the exhaust port of the drying device (4) and the air inlet port of the water tank (5), and air generated by the drying device (4) during drying is sucked into the water tank (5) through the suction fan (9).
5. The wastewater treatment system according to claim 1, further comprising an air compressor or blower, the exhaust pipe of which extends into the aeration tank (2) for feeding gas into the aeration tank (2) to achieve blast aeration.
6. A sewage treatment method is characterized by comprising the following steps:
s1, sending the sewage in the sewage tank (1) into an aeration tank (2), adding chemicals into the sewage in the aeration tank (2) and aerating to ensure that the sewage in the aeration tank (2) fully undergoes chemical reaction;
s2, feeding the water treated in the aeration tank (2) into a filtering device (3) to obtain filtered water and filter residues;
s3, sending the filter residue obtained in the step S2 into a drying device (4) for drying to obtain dried filter residue;
and S4, sending the gas generated in the step S3 when the drying equipment (4) dries into the water tank (5), filtering the gas by the water in the water tank (5), and then discharging the gas.
7. The wastewater treatment method according to claim 6, wherein in step S1, air is fed into the aeration tank (2) by an air compressor or a blower to perform blast aeration.
8. The wastewater treatment method according to claim 6, wherein in step S2, the filtered water is detected, and if the water quality is qualified, the filtered water is directly discharged, and if the water quality is not qualified, the filtered water is sent to a wastewater treatment plant for secondary treatment.
9. The wastewater treatment method according to claim 6, wherein in step S3, the residue is transported to a drying device by a conveyor (6), and the dried residue is transported to a treatment plant for treatment.
10. The wastewater treatment method according to claim 6, further comprising, after step S4, the steps of: the water in the water tank (5) is sent into the sewage pool (1), and then clear water is added into the water tank (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911131843.4A CN110697941A (en) | 2019-11-19 | 2019-11-19 | Sewage treatment system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911131843.4A CN110697941A (en) | 2019-11-19 | 2019-11-19 | Sewage treatment system and method |
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| CN110697941A true CN110697941A (en) | 2020-01-17 |
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| CN201911131843.4A Pending CN110697941A (en) | 2019-11-19 | 2019-11-19 | Sewage treatment system and method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107601760A (en) * | 2017-09-20 | 2018-01-19 | 和智（广州）环保科技有限公司 | Big-and-middle-sized sewage disposal V-type air lift denitrification dephosphorization technique |
| CN107823979A (en) * | 2017-10-24 | 2018-03-23 | 蚌埠市徐善种植农民专业合作社 | A kind of high-environmental stalk dries dust arrester |
| CN208684596U (en) * | 2018-12-24 | 2019-04-02 | 四川中喻环境治理有限公司 | A kind of sewage-treatment plant of recyclable sludge |
-
2019
- 2019-11-19 CN CN201911131843.4A patent/CN110697941A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107601760A (en) * | 2017-09-20 | 2018-01-19 | 和智（广州）环保科技有限公司 | Big-and-middle-sized sewage disposal V-type air lift denitrification dephosphorization technique |
| CN107823979A (en) * | 2017-10-24 | 2018-03-23 | 蚌埠市徐善种植农民专业合作社 | A kind of high-environmental stalk dries dust arrester |
| CN208684596U (en) * | 2018-12-24 | 2019-04-02 | 四川中喻环境治理有限公司 | A kind of sewage-treatment plant of recyclable sludge |
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Application publication date: 20200117 |
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