CN111470650A - Multi-edging polishing line sewage shared treatment reclaimed water recycling system - Google Patents
Multi-edging polishing line sewage shared treatment reclaimed water recycling system Download PDFInfo
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- CN111470650A CN111470650A CN201910762146.2A CN201910762146A CN111470650A CN 111470650 A CN111470650 A CN 111470650A CN 201910762146 A CN201910762146 A CN 201910762146A CN 111470650 A CN111470650 A CN 111470650A
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- 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
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- 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
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- 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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- 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
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- 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
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- 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 provides a sewage common-use type reclaimed water treatment and recycling system with multiple edging and polishing lines, which is arranged beside production water equipment, the system comprises a coarse and fine particle rapid separation device, a coagulation-aid automatic dosing device, a high-position tank sewage precipitation device, a controllable concentration slurry recycling device and a clear water recycling device in sequence, wherein the production water device discharges sewage with particles into the coarse and fine particle rapid separation device for coarse particle separation, the sewage after coarse particle separation enters the coagulation-aid automatic dosing device again, a PAC coagulant and a PAM coagulant are added into the coagulation-aid automatic dosing device at a certain concentration, the sewage is pumped into the high-position tank sewage precipitation device for continuous low-flow-rate dynamic precipitation, clear water and mud-containing thick slurry are separated, the mud-containing thick slurry enters the controllable concentration slurry recycling device to be made into mud or enter a slurry preparation tank, and clear water returns to the production water device through the clear water recycling device for recycling. The invention has the advantages of small floor area, proper circulating water storage, small evaporation loss, low equipment cost and the like.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a multi-edging polishing line sewage shared type reclaimed water treatment recycling system.
Background
A large amount of mud-containing sewage can be generated in the production process of ceramic tile edging and wet polishing in building ceramic enterprises, if the mud-containing sewage is directly discharged, environmental pollution can be caused, a large amount of water resources and available mud materials are wasted, the mud materials and the water resources must be treated, and the treated reclaimed water and the treated mud materials can be recycled.
The existing mud-containing sewage reuse treatment system in the existing building ceramic industry adopts an advection pool sedimentation process, and has the following problems and disadvantages:
1. the settling treatment process of the advection pool is adopted, and a plurality of advection pools are arranged, so that the occupied area is large, and the management workload is large.
2. The physical method is used for precipitation, the precipitation time is long, the circulating water storage is huge, and the evaporation loss is large.
3. The sediment is difficult to clean, and the area needing to be cleaned is large; the dehydrated material has high water content and high treatment cost.
Disclosure of Invention
Aiming at the problems, the invention provides a multi-edging polishing line sewage shared type reclaimed water treatment recycling system which has the advantages of small occupied area, proper circulating water storage amount, small evaporation loss and low equipment cost.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a sewage sharing formula of many edging and polishing line is handled well water recycling system which characterized in that: the system is arranged beside production water equipment, and comprises coarse and fine particle rapid separation equipment, coagulation aid automatic dosing equipment, high-level tank sewage precipitation equipment, controllable concentration slurry recycling equipment and clear water recycling equipment in sequence, wherein the production water equipment discharges sewage with particles into the coarse and fine particle rapid separation equipment for coarse particle separation, the sewage after coarse particle separation enters the coagulation aid automatic dosing equipment again, a PAC coagulant and a PAM coagulant aid with certain concentration are added into the coagulation aid automatic dosing equipment and are stirred, the sewage is pumped into the high-level tank sewage precipitation equipment for continuous low-flow-rate dynamic precipitation, clear water and mud-containing thick slurry are separated, the mud-containing thick slurry enters the controllable concentration slurry recycling equipment to be made into mud or enters a slurry preparation tank for standby, and clear water returns to the production water equipment through the clear water recycling equipment for recycling.
As a further scheme, the rapid coarse and fine particle separation equipment comprises a sand sediment well, a coarse and fine particle separation sieve and a slag receiving hopper, production water equipment is connected to the sand sediment well through a drainage channel, a submersible mortar pump is arranged in the sand sediment well to pump sewage with particles into the coarse and fine particle separation sieve for sieving, coarse particles fall into the slag receiving hopper, and sewage containing fine particles enters a sewage collection pool.
As a further scheme, the automatic coagulant aid dosing equipment comprises a coagulant aid opening tank and a coagulant aid storage tank, wherein the coagulant aid opening tank is arranged above the coagulant aid storage tank, PAC coagulant or PAM coagulant aid is dissolved in water by the coagulant aid opening tank to prepare a solution with a certain concentration, and then the solution flows to the coagulant aid storage tank and then flows into the sewage collection tank through a drainage channel.
As a further scheme of the invention, the high-level tank sewage sedimentation equipment comprises a high-level vertical flow type sewage sedimentation tank, sewage in a sewage collecting tank is pumped into the high-level vertical flow type sewage sedimentation tank through a high-level tank water-feeding mortar pump, the upper part of the high-level vertical flow type sewage sedimentation tank is communicated to the clean water recycling equipment through a water pipe, and the lower part of the high-level vertical flow type sewage sedimentation tank is communicated to a thick slurry tank through a thick slurry discharge pipe.
As a further scheme of the invention, the controllable-concentration slurry recycling device comprises a pressure filtration dehydration device, the thick slurry in the thick slurry tank is conveyed to the pressure filtration dehydration device through a thick slurry conveying pressure filtration pump for dehydration to obtain the slurry for recycling, and the clear water squeezed by the pressure filtration dehydration device flows into a filtrate clear water tank.
As a further scheme of the present invention, the clean water reuse apparatus includes a high-level clean water storage tank, water in the filtrate clean water tank is pumped to the clean water reuse apparatus through a filtrate clean water pump, and the high-level vertical flow type sewage settling tank is higher than the high-level clean water storage tank and is communicated to the high-level clean water storage tank through a water pipe.
As a further scheme of the invention, the filtrate clean water tank is connected to the inlet of the dense slurry conveying and pressure filtering pump through a water pipe for clearing blockage.
As a further scheme of the invention, stirring equipment is arranged in the sewage collecting tank or the thick slurry tank for stirring.
The invention has the beneficial effects that:
1. the system of the invention adopts the high-level sewage sedimentation tank and the high-level clear water storage tank, and makes full use of the high space, so that the system has small floor area, reasonable, compact and beautiful structural design;
2. the invention adopts the modular design, the system cost is low, the construction is simple and quick, and the capacity of expanding production is strong;
3. the system has low operation cost, small medicament dosage and high-efficiency solid-liquid separation;
4. the system of the invention discharges clear water at high position and mud at low position, and the mud is convenient to discharge and is not blocked;
5. the front end of the system is provided with the coarse and fine particle rapid separation device, so that the blockage of a sewage pipe and a sewage channel can be solved, the abrasion of sand to equipment such as a submersible mortar pump and the like can be reduced, and the service life of the equipment is prolonged;
6. the system of the invention adds a chemical coagulation aiding method, accelerates the sedimentation speed, improves the efficiency, has proper circulating water storage and small evaporation loss.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The technical solution of the present invention is described below with reference to the accompanying drawings and examples.
Referring to fig. 1, the invention provides a multi-edging and polishing line sewage shared reclaimed water treatment and reuse system, which is arranged beside a production water device 1, wherein the production water device 1 refers to a polishing line or edging line water device, the multi-edging and polishing line sewage shared reclaimed water treatment and reuse system sequentially comprises a coarse and fine particle rapid separation device, an auxiliary coagulation automatic dosing device, a high-level tank sewage precipitation device, a controllable concentration slurry reuse device and a clean water reuse device, and the quantity of all the devices can be determined according to the sewage quantity generated by the production water device 1, and the treatment speed can be met by respectively adopting a mode of parallel arrangement of a plurality of devices. Wherein, thick and thin granule quick separation equipment is including sand setting well 2, thick and thin granule separation sieve 3 and connect sediment fill 4, and process water equipment 1 is connected to sand setting well 2 through drainage channel 5, is equipped with dive mortar pump 6 in the sand setting well 2 with mortar pump to thick and thin granule separation sieve 3, and the thick granule material that thick and thin granule separation sieve 3 sieved falls to connecing sediment fill 4. The automatic coagulant aid dosing device comprises a coagulant aid opening tank 7 and a coagulant aid storage tank 8, the rear end of a slag receiving hopper 4 is provided with the coagulant aid storage tank 8, the coagulant aid opening tank 7 is arranged above or near the coagulant aid storage tank 8, the rear end of the coagulant aid storage tank 8 is provided with a sewage collecting tank 9, a level meter and a stirring device 10 are arranged in the sewage collecting tank 9, the high-level tank sewage settling device comprises a high-level vertical flow type sewage settling tank 11, sewage in the sewage collecting tank 9 is pumped into the high-level vertical flow type sewage settling tank 11 through a high-level tank water-feeding mortar pump 22, the high-level vertical flow type sewage settling tank 11 is vertically arranged, the space of the height is fully utilized, the upper part of the high-level vertical flow type sewage settling tank 11 is communicated to the clear water recycling device through a water pipe, the position of the high-level vertical flow type sewage settling tank 11 is higher than the clear water recycling device, the lower part of the high-level vertical flow type sewage settling tank 11 is communicated to a thick liquid tank, the high-level vertical sewage settling tank 11 is provided with a liquid level meter, a thick slurry discharge pipe 12 is provided with a slurry concentration monitor 14, and a stirring device 10 is arranged in the thick slurry tank 13 to prevent the thick slurry from settling. The controllable concentration slurry recycling equipment comprises pressure filtration dehydration equipment 15, wherein concentrated slurry in a concentrated slurry tank 13 is pumped to the pressure filtration dehydration equipment 15 through a concentrated slurry conveying pressure filtration pump 16 for dehydration to obtain sludge recycling, a filtrate clear water tank 17 is arranged at the rear end of the pressure filtration dehydration equipment 15, clear water squeezed by the pressure filtration dehydration equipment 15 flows into the filtrate clear water tank 17, the output end of the concentrated slurry conveying pressure filtration pump 16 is further connected to a slurry preparation tank 18, the clear water recycling equipment comprises a high-level clear water storage tank 19, water in the filtrate clear water tank 17 is pumped to the high-level clear water storage tank 19 through a filtrate clear water pump 20, the high-level vertical flow type sewage settling tank 11 is higher than the high-level clear water storage tank 19 and communicated to the high-level clear water storage tank 19 through a water pipe, the filtrate clear water tank 17 is connected to an inlet of the concentrated slurry conveying pressure filtration pump 16 through a water pipe for blockage removal, and water in the high-level clear water storage tank 19 is pumped to the production water storage equipment 1 through a clear water conveying pump 21 for recycling The application is as follows.
The working principle of the invention is as follows: the sewage with silt produced by the production water equipment 1 flows to a sand setting well 2, a submersible mortar pump 6 is arranged in the sand setting well 2 to pump the sewage with particles into a coarse and fine particle separation sieve 3 for sieving, coarse particles fall into a slag receiving hopper 4 for removing, the sewage containing fine particles enters a sewage collection pool 9, a coagulant aid opening tank 7 dissolves PAC coagulant or PAM coagulant aid in water to prepare a solution with a certain concentration and then flows into a coagulant aid storage tank 8, the solution of the coagulant aid storage tank 8 flows into a drainage channel 5 at the front end of the sewage collection pool 9 and then flows into the sewage collection pool 9, a stirring device 10 of the sewage collection pool 9 stirs the sewage, and then the sewage is pumped into a high-level tank sewage precipitation device through a high-level tank water mortar pump 22 to carry out continuous low-flow-rate dynamic precipitation to separate clear water and mud-containing thick slurry, the clear water flows into a high-level clear water storage tank 19, and the mud-containing thick slurry flows into a thick slurry pool 13, the thick pulp of the thick pulp tank 13 is pumped to a filter-pressing dehydration device 15 through a thick pulp conveying filter-pressing pump 16 for dehydration to obtain mud for recycling, clear water squeezed out by the filter-pressing dehydration device 15 flows into a filtrate clear water tank 17, or is directly pumped into a pulp distribution tank 18 for later use, one path of water in the filtrate clear water tank 17 is connected to an inlet of the thick pulp conveying filter-pressing pump 16 through a water pipe, so that blockage can be cleared, the other path of water is pumped into a high-level clear water storage tank 19 through the filtrate clear water tank 17, and water in the clear water storage tank is pumped into the production water equipment 1 through a clear water conveying pump 21 for recycling.
The invention has the following advantages:
1. the front end of the system is provided with a coarse and fine particle rapid separation device, sewage flows through a sand sediment well 2 firstly, coarse particles can deposit at the bottom of the sand sediment well 2 due to the fact that the flow rate is reduced, the deposited coarse particles are pumped to a coarse and fine particle separation screen 3 at regular time by a submersible mortar pump 6 to be separated, the separated coarse particles are taken away by a slag receiving hopper 4, and fine particles flow to a sewage collection pool 9 along with the sewage; not only can solve the problem that sewer pipe and sewer blocked up like this, can also reduce the wearing and tearing of coarse particles to equipment such as dive mortar pump 6, the life of extension equipment.
2. The system is provided with coagulation-aiding automatic dosing equipment, and in order to enable mud to be precipitated and separated as soon as possible, a coagulant PAC and a flocculant PAM can be added according to the actual components of the sewage. The automatic coagulant adding equipment can add preset medicine into the collecting tank quantitatively, and the stirring equipment 10 of the collecting tank enables the medicine and the sewage to be uniformly mixed, enables the mud in the sewage to be flocculated quickly, solves the problem that the prior art only depends on physical precipitation and is long in existence time, and improves the precipitation efficiency.
3. The system is provided with a high-position vertical flow type sewage sedimentation tank 11, the high-position vertical flow type sewage sedimentation tank 11 is the core of the system, the floor area is small, the high space is fully utilized, and the structural design is reasonable and compact; clear water is discharged from the upper part of the high-position vertical flow type sewage settling tank 11, thick slurry is discharged from the lower part of the high-position vertical flow type sewage settling tank under pressure, and the slurry is conveniently discharged without blockage; the equipment operation cost is low, the medicament dosage is small, and the solid and the liquid can be efficiently separated.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation and a specific orientation configuration and operation, and thus, should not be construed as limiting the present invention. Furthermore, "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate member, or they may be connected through two or more elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (8)
1. The utility model provides a sewage sharing formula of many edging and polishing line is handled well water recycling system which characterized in that: the system is arranged beside production water equipment, and comprises coarse and fine particle rapid separation equipment, coagulation aid automatic dosing equipment, high-level tank sewage precipitation equipment, controllable concentration slurry recycling equipment and clear water recycling equipment in sequence, wherein the production water equipment discharges sewage with particles into the coarse and fine particle rapid separation equipment for coarse particle separation, the sewage after coarse particle separation enters the coagulation aid automatic dosing equipment again, a PAC coagulant and a PAM coagulant aid with certain concentration are added into the coagulation aid automatic dosing equipment and are stirred, the sewage is pumped into the high-level tank sewage precipitation equipment for continuous low-flow-rate dynamic precipitation, clear water and mud-containing thick slurry are separated, the mud-containing thick slurry enters the controllable concentration slurry recycling equipment to be made into mud or enters a slurry preparation tank for standby, and clear water returns to the production water equipment through the clear water recycling equipment for recycling.
2. The multi-edging and polishing line sewage shared treatment reclaimed water recycling system according to claim 1, characterized in that: coarse and fine granule quick separation equipment is including sand setting well, thickness granule separation sieve and connect the sediment fill, and the process water equipment is connected to the sand setting well through the drainage channel, is equipped with the dive mortar pump in the sand setting well and sieves in going into the thickness granule separation sieve with the sewage pump of taking the granule, and the coarse particles thing falls into connect the sediment fill, the sewage that contains the fine particle gets into sewage collecting pit.
3. The multi-edging and polishing line sewage shared treatment reclaimed water recycling system according to claim 2, characterized in that: the automatic coagulant aid dosing equipment comprises a coagulant aid opening tank and a coagulant aid storage tank, wherein the coagulant aid opening tank is installed above the coagulant aid storage tank, PAC coagulant or PAM coagulant aid is dissolved in water by the coagulant aid opening tank, the solution with a certain concentration is prepared and then flows to the coagulant aid storage tank, and then flows into the sewage collection tank through the drainage channel.
4. The multi-edging and polishing line sewage shared treatment reclaimed water recycling system according to claim 3, wherein: the high-level tank sewage sedimentation equipment comprises a high-level vertical flow type sewage sedimentation tank, sewage in a sewage collecting tank is pumped into the high-level vertical flow type sewage sedimentation tank through a high-level tank water-feeding mortar pump, the upper part of the high-level vertical flow type sewage sedimentation tank is communicated to the clear water recycling equipment through a water pipe, and the lower part of the high-level vertical flow type sewage sedimentation tank is communicated to a thick liquid tank through a thick liquid discharge pipe.
5. The multi-edging and polishing line sewage shared treatment reclaimed water recycling system according to claim 4, wherein: the controllable concentration slurry recycling equipment comprises pressure filtration dehydration equipment, wherein the thick slurry in the thick slurry tank is conveyed to the pressure filtration dehydration equipment through a thick slurry conveying pressure filtration pump for dehydration to obtain the slurry for recycling, and the clear water squeezed by the pressure filtration dehydration equipment flows into a filtrate clear water tank.
6. The multi-edging and polishing line sewage shared treatment reclaimed water recycling system according to claim 5, wherein: the clear water recycling equipment comprises a high-position clear water storage tank, water in the filtrate clear water tank is pumped to the clear water recycling equipment through a filtrate clear water pump, and the high-position vertical flow type sewage settling tank is higher than the high-position clear water storage tank and is communicated to the high-position clear water storage tank through a water pipe.
7. The multi-edging and polishing line sewage shared treatment reclaimed water recycling system according to claim 5, wherein: the filtrate clean water tank is connected to the inlet of the dense slurry conveying and filter pressing pump through a water pipe and is used for clearing blockage.
8. The system according to claim 3 or 4, wherein said system comprises: and stirring equipment is arranged in the sewage collecting tank or the thick slurry tank for stirring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910762146.2A CN111470650A (en) | 2019-08-19 | 2019-08-19 | Multi-edging polishing line sewage shared treatment reclaimed water recycling system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910762146.2A CN111470650A (en) | 2019-08-19 | 2019-08-19 | Multi-edging polishing line sewage shared treatment reclaimed water recycling system |
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| CN111470650A true CN111470650A (en) | 2020-07-31 |
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| CN201910762146.2A Pending CN111470650A (en) | 2019-08-19 | 2019-08-19 | Multi-edging polishing line sewage shared treatment reclaimed water recycling system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112390412A (en) * | 2020-11-06 | 2021-02-23 | 江西唯美陶瓷有限公司 | Sewage treatment system, control method and sewage filter-pressing-free treatment method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008155188A (en) * | 2006-12-20 | 2008-07-10 | Sanwa Kizai Co Ltd | Mud and muddy water treatment method |
| CN105923970A (en) * | 2016-04-20 | 2016-09-07 | 上海城隧盛业建设发展有限公司 | Slurry-water separation system and slurry-water separation method |
| CN106348406A (en) * | 2016-08-25 | 2017-01-25 | 清远纳福娜陶瓷有限公司 | Polishing waste slag recycling method and facility used by method |
| CN108069539A (en) * | 2016-11-13 | 2018-05-25 | 广西北流惠丰瓷业有限公司 | A kind of method that waste mud recycles in Production of Ceramics |
-
2019
- 2019-08-19 CN CN201910762146.2A patent/CN111470650A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008155188A (en) * | 2006-12-20 | 2008-07-10 | Sanwa Kizai Co Ltd | Mud and muddy water treatment method |
| CN105923970A (en) * | 2016-04-20 | 2016-09-07 | 上海城隧盛业建设发展有限公司 | Slurry-water separation system and slurry-water separation method |
| CN106348406A (en) * | 2016-08-25 | 2017-01-25 | 清远纳福娜陶瓷有限公司 | Polishing waste slag recycling method and facility used by method |
| CN108069539A (en) * | 2016-11-13 | 2018-05-25 | 广西北流惠丰瓷业有限公司 | A kind of method that waste mud recycles in Production of Ceramics |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112390412A (en) * | 2020-11-06 | 2021-02-23 | 江西唯美陶瓷有限公司 | Sewage treatment system, control method and sewage filter-pressing-free treatment method |
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Application publication date: 20200731 |