CN210342077U - Rainwater and domestic water reutilization system - Google Patents
Rainwater and domestic water reutilization system Download PDFInfo
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- CN210342077U CN210342077U CN201921054764.3U CN201921054764U CN210342077U CN 210342077 U CN210342077 U CN 210342077U CN 201921054764 U CN201921054764 U CN 201921054764U CN 210342077 U CN210342077 U CN 210342077U
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Abstract
The utility model belongs to the field of environmental protection equipment, and relates to the technical field of sewage recovery, in particular to a rainwater and domestic water secondary utilization system, which comprises a clean water tank, wherein the water inlet end of the clean water tank is communicated with a tap water pipeline, the front end of the clean water tank is also respectively connected with a rainwater recovery cleaning system and a domestic water recovery cleaning system, the rainwater recovery cleaning system comprises a water collecting tank, a rainwater filtering tank and a rainwater disinfection tank which are sequentially installed, and the water outlet end of the rainwater disinfection tank is communicated with the water inlet end of the clean water tank; clean system is retrieved to domestic water includes sewage collecting pit, sewage sedimentation tank, constructed wetland, sewage filtering ponds and the sewage disinfection pond of installing in order, and the play water end in this sewage disinfection pond and the end of intaking in clean water basin are linked together, the clean water basin collects rainwater and domestic water after handling, and municipal water pipe is supplementary for the clean water basin, and the play water end and the water equipment in this clean water basin are linked together.
Description
Technical Field
The utility model belongs to the environmental protection equipment field relates to sewage recovery technical field, especially rainwater and domestic water reutilization system.
Background
Water is an indispensable resource for human activities, however, the water resource in China is seriously lacked, so that the economy, the society and the scientific and technological development of China face severe examination, and therefore, the water conservation is not slow. At present, the toilet water in China accounts for more than 40% of the whole domestic water, so that a new toilet water source is necessarily found. The rainwater is used as an important natural resource, has low pollution and is easy to treat, thus being used as toilet flushing water. In addition, rural domestic sewage such as vegetable washing water and washing water can be used as toilet flushing water after certain treatment. However, at present, rural domestic sewage and purification treatment technology are incomplete, so that the utilization rate of rural domestic sewage and rainwater in China is low.
Therefore, attempts have been made to improve the above-mentioned technical solutions. Chinese patent document CN 205421399U provides a rainwater toilet-flushing water feeder, which comprises a water collecting tank and a water tank, wherein the top of the water collecting tank is provided with an opening and is matched with a blocking net, and the bottom of the water collecting tank is provided with a water outlet; the water outlet is connected with a water tank through a water pipe, and the water tank is provided with a plurality of water supply pipelines and is matched with corresponding valves. Through the cooperation of water catch bowl, fender net, delivery port, water tank and water supply pipeline etc. can collect the rainwater as toilet flushing water, can the water economy resource. Chinese patent document CN 206971321U provides a "water saving system for domestic wastewater reclamation and flushing", which comprises a water storage device, wherein the water storage device comprises a tap water tank, a sewage tank and a control valve, and the water storage device is arranged below a wash platform, so that the system is suitable for being widely applied in dormitories of colleges and universities, and achieves the purpose of saving a large amount of water resources.
For rainwater, rural rainwater mainly comprises three return media, namely a roof, a road and a permeable ground. The runoff coefficients of roofs and roads are large, the runoff of rainwater is large, but according to the current rural sanitary condition in China, the COD in the rainwater of the roads is as high as 3000 mg/L; the permeable ground basically takes permeability as a main part and has limited collection amount; therefore, compared with the 3 types of return media, the roof rainwater has better water quality, large net flow and convenient collection and utilization, so the rural rainwater and domestic sewage recovery type water flushing toilet mainly collects rural roof rainwater for flushing the toilet. And to the roof rainwater, the initial stage rainwater erodees pollutants such as roof dust, and consequently the rainwater exists higher pollutant earlier, handles the degree of difficulty big cost height, and the backward flow volume is low, the utility model discloses a rainwater and domestic sewage recovery formula water-washed lavatory abandons the flow through abandoning 2mm before the flow valve air current, greatly reduced the post processing degree of difficulty, practice thrift treatment cost. Chinese patent document CN 205421399U provides a "rainwater toilet-flushing water supply device", which only has two filtering devices, but cannot remove harmful pathogenic bacteria in rainwater, rainwater can be recovered to flush toilet rainwater, and there is a chance of direct contact with human body, and aquatic pathogens can infect human body by inhalation, ingestion, and skin contact, so that in order to reduce public health risks, pathogenic bacteria in rainwater toilet-flushing should be paid attention to in addition to inorganic and organic pollutants in rainwater.
In 2016, the domestic sewage production in rural areas in China is 83.51 hundred million to 125.26 billion cubic meters, only 20 percent of administrative villages treat the domestic sewage, and the rest is basically directly discharged into the environment, which is a waste of water resources and also seriously influences the living environment of the rural areas. A large number of researches show that pollutants contained in the domestic sewage are mainly organic matters (such as protein, carbohydrate, fat, urea, ammonia nitrogen and the like) and a large number of pathogenic microorganisms (such as parasitic ova, intestinal infectious viruses and the like), and if the domestic sewage is not treated in place, secondary pollution can be caused even after the domestic sewage is used for flushing a toilet. Therefore, a more complicated treatment process is required before the sanitary wastewater is flushed, compared with rainwater. Chinese patent document CN 206971321U provides a domestic wastewater recovery toilet-flushing water-saving system, but the system does not carry out systematic treatment on domestic sewage, so that a human body has strong potential safety hazards; in addition, the system is only suitable for high school hostess, the application range of the system is very limited, and therefore the cost performance of the two technical schemes is low, and the system has no practical value in rural areas. Therefore, the research on the technical scheme of the rainwater and domestic sewage recovery type water flushing toilet which can adapt to the rural environment is of great significance.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a simple structure, effectively collect, handle rainwater and domestic water reutilization system to rainwater and domestic water.
The utility model adopts the technical proposal that:
rainwater and domestic water reutilization system, including a clean water basin, the end of intaking in this clean water basin is linked together its characterized in that with the running water pipeline: the front end of the clean water tank is also respectively connected with a rainwater recovery and cleaning system and a domestic water recovery and cleaning system, the rainwater recovery and cleaning system comprises a water collecting tank, a rainwater filtering tank and a rainwater disinfection tank which are sequentially installed, and the water outlet end of the rainwater disinfection tank is communicated with the water inlet end of the clean water tank; clean system is retrieved to domestic water includes sewage collecting pit, sewage sedimentation tank, constructed wetland, sewage filtering ponds and the sewage disinfection pond of installing in order, and the play water end in this sewage disinfection pond and the end of intaking in clean water basin are linked together, the clean water basin collects rainwater and domestic water after handling, and municipal water pipe is supplementary for the clean water basin, and the play water end and the water equipment in this clean water basin are linked together.
And the water collecting tank is respectively arranged at the top of the building and in an open area and used for bearing rainwater, an weather information collecting device is arranged in the area where the water collecting tank is arranged, a weather information collecting module is arranged in the weather information collecting device, and the signal output end of the weather information collecting module is connected with a central control unit.
And an outer discharge pipe is arranged at the bottom in the rainwater collection pool, an electromagnetic valve and a flowmeter are arranged in the outer discharge pipe, and the control end of the electromagnetic valve is communicated with the central control unit.
And a filtering tank is arranged in the rainwater filtering tank, the filtering tank comprises a replaceable filter element and a backflushing device, a pressure sensor is arranged in the filtering tank and used for detecting the pressure difference between the inside and the outside of the filter element, the signal output end of the pressure sensor is connected with a central control unit, and the central control unit is connected with the control end of the backflushing device.
And, install a level sensor and one in the rainwater disinfection pond and built-in holding case that has sodium hypochlorite, level sensor is used for the water level height in the real-time detection rainwater disinfection pond, and this level sensor's signal output part is connected with the well accuse unit, holding case system has a liquid outlet, and this liquid outlet is connected with a drawing liquid pump, install flowmeter and solenoid valve in the liquid outlet, the flowmeter is used for detecting the liquid flow who is derived by the holding case.
And a filtering tank is arranged in the sewage filtering tank, the filtering tank comprises a replaceable filter element and a backflushing device, a pressure sensor is arranged in the filtering tank and used for detecting the pressure difference between the inside and the outside of the filter element, the signal output end of the pressure sensor is connected with a central control unit, and the central control unit is connected with the control end of the backflushing device.
And, install a level sensor and one in the sewage disinfection pond and embed the holding case that has sodium hypochlorite, level sensor is used for the water level height in the real-time detection rainwater disinfection pond, and this level sensor's signal output part and well accuse unit are connected, holding case system has a liquid outlet, and this liquid outlet and a drawing liquid pump are connected, install flowmeter and solenoid valve in the liquid outlet, the flowmeter is used for detecting the liquid flow who is derived by the holding case.
And the water inlet end in the clean water tank is provided with an electromagnetic valve which can be communicated with a tap water pipeline, the clean water tank is communicated with an external circulation pipeline, a centrifugal pump is arranged at the communication position of the clean water tank and the external circulation pipeline, and the control end of the centrifugal pump is communicated with the central control unit.
And the artificial wetland is internally planted with aquatic plants for absorbing nitrogen and phosphorus elements in the sewage.
The utility model has the advantages that:
the utility model discloses in, including a clean water basin, this clean water basin's the end of intaking respectively with the running water pipeline, clean system is retrieved with domestic water to rainwater recovery clean system and is connected, form the water system that a three kinds of water sources supplied water, wherein retrieve clean system as main water source with domestic water, under the prerequisite of saving the water resource, still can solve the problem of water pollution and unordered outer row in current rural environment, clean system is retrieved to the rainwater, then can supply the resident water in the more time of precipitation such as rainy season, the running water pipeline then supplies the water when domestic water volume is low and the rainwater stock is not enough.
In the utility model, the water collecting tank is arranged at the top of the periphery of the building or in an open public area and is used for collecting natural rainfall and guiding the natural rainfall into the rainwater collecting tank; the rainwater collection pool is used for collecting and storing rainwater in the plurality of water collection tanks, pollutants or particles in the air can fall and accumulate along with the rainwater in the early stage of rainfall, and the content of pollutants in the rainwater is high, so that the rainwater is not beneficial to treatment and secondary utilization; the rainwater filtering pool is internally provided with filtering equipment for filtering and processing the water led out by the rainwater collecting pool, wherein the equipped pressure sensor is used for detecting the pressure difference between the inside and the outside of the filter element, when the difference exceeds a preset threshold value, the backflushing device is started to backflush the filter element so as to ensure the filtering effect of the filter element, and when the pressure difference after backflushing cannot be recovered within the threshold value, the filter element needs to be replaced; liquid level sensor of system in the rainwater disinfection pond is used for the interior water level change in real-time supervision rainwater disinfection pond, when the water yield of deriving by rainwater filtering ponds reaches the predetermined threshold value of liquid level sensor, then derive holding incasement's sodium hypochlorite solution through the drawing liquid pump, when the flowmeter detects the increment adaptation of the solution flow who derives and water level, then to solenoid valve output control command, make it closed, guarantee that the proportion of sodium hypochlorite and water maintains throughout one more for invariable value, guarantee that moisture is in the weak alkaline state, effectively move to breeding of bacterium, guarantee the cleanness of water.
The utility model discloses in, sewage collecting tank is used for collecting domestic water, and carry out preliminary treatment and deposit at sewage sedimentation tank, domestic water exists its particularity, if wash the dish water, the inside such as wash dish water is rich in a large amount of nitrogen phosphorus element, but do not have the device of special treatment nitrogen phosphorus element at present, if these water are directly arranged outward, then lead to the eutrophication of outside water easily, therefore, constructed wetland has been arranged in its cooperation, plant aquatic plant in constructed wetland, can effectively adsorb nitrogen phosphorus element in the water, the moisture after the sedimentation tank is handled switches on to the one side of intaking of constructed wetland as the supplementary water source, drainage one side of constructed wetland then switches on with sewage filtering ponds and sewage disinfection pond, realize domestic water's filtration and disinfection, and finally lead to in to the clean water basin.
The utility model discloses in, well accuse unit is arranged in retrieving clean system and domestic water to the rainwater and retrieves detection device's such as clear collection flowmeter, level sensor, pressure sensor data to control devices such as solenoid valve, drawing liquid pump, recoil ware, form a structural integrity, in the inseparable system of cooperation.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic block diagram of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
The rainwater and domestic water secondary utilization system comprises a clean water tank 7, wherein the water inlet end of the clean water tank is communicated with a tap water pipeline 9, the innovation of the utility model is that the front end of the clean water tank is also respectively connected with a rainwater recovery cleaning system and a domestic water recovery cleaning system, the rainwater recovery cleaning system comprises a water collecting tank 4, a rainwater collecting tank 5, a rainwater filtering tank 6 and a rainwater disinfection tank 5 which are sequentially installed, and the water outlet end of the rainwater disinfection tank is communicated with the water inlet end of the clean water tank; clean system is retrieved to domestic water is including the sewage collecting pit 14, sewage sedimentation tank 13, constructed wetland 12, sewage filtering ponds 11 and the sewage disinfection pond 10 of installing in order, and the play water end in this sewage disinfection pond and the end of intaking in clean water basin are linked together, the clean water basin collects rainwater and domestic water after handling, and municipal water pipe is supplementary for the clean water basin, and the play water end and the toilet bowl in this clean water basin, water equipment 8 such as flusher are linked together.
In this embodiment, the water collecting tank is respectively arranged at the top 3 of the building and in the open area for receiving rainwater, an weather information collecting device 1 is installed in the area where the water collecting tank is arranged, a weather information collecting module is arranged in the weather information collecting device, and a signal output end of the weather information collecting module is connected with a central control unit.
In this embodiment, an outer discharge pipe is installed at the bottom in the rainwater collection tank, an electromagnetic valve and a flowmeter are installed in the outer discharge pipe, and a control end of the electromagnetic valve is communicated with the central control unit.
In this embodiment, install in the rainwater filter tank and filter the jar, including interchangeable filter core and recoil ware in this filters the jar, install pressure sensor in filtering the jar, this pressure sensor is used for detecting the pressure differential between the inside and outside of filter core, pressure sensor's signal output part is connected with well accuse unit, and well accuse unit is connected with the control end of recoil ware.
In this embodiment, install a level sensor and one in the rainwater disinfection pond and embed the holding case that has sodium hypochlorite, level sensor is used for the water level height in the real-time detection rainwater disinfection pond, and this level sensor's signal output part and well accuse unit are connected, holding case system has a liquid outlet, and this liquid outlet and a drawing liquid pump are connected, install flowmeter and solenoid valve in the liquid outlet, the flowmeter is used for detecting the liquid flow who is derived by the holding case.
In this embodiment, install in the sewage filtering ponds and filter the jar, including interchangeable filter core and recoil ware in this filters the jar, install pressure sensor in filtering the jar, this pressure sensor is used for detecting the pressure differential between the inside and outside of filter core, pressure sensor's signal output part is connected with well accuse unit, and well accuse unit is connected with the control end of recoil ware.
In this embodiment, install a level sensor and one in the sewage disinfection pond and embed the holding case that has sodium hypochlorite, level sensor is used for the water level height in the real-time detection rainwater disinfection pond, and this level sensor's signal output part and well accuse unit are connected, holding case system has a liquid outlet, and this liquid outlet and a drawing liquid pump are connected, install flowmeter and solenoid valve in the liquid outlet, the flowmeter is used for detecting the liquid flow who is derived by the holding case.
In this embodiment, an electromagnetic valve is installed at a water inlet end in the clean water tank, the clean water tank is communicated with a tap water pipeline through the electromagnetic valve, the clean water tank is communicated with an external circulation pipeline, a centrifugal pump is installed at a communication position of the clean water tank and the external circulation pipeline, and a control end of the centrifugal pump is communicated with the central control unit.
In this embodiment, the artificial wetland is planted with aquatic plants for absorbing nitrogen and phosphorus elements in the sewage.
In the embodiment, the weather information collection module adopts a rainfall station, which is produced by Beijing Western and Chinese science and technology Limited and has the model number of M30232.
In this embodiment, the flow meter installed on the external drainage pipe is a DX-LSX-1 doppler ultrasonic flow meter manufactured by wuhan delichi science and technology limited, and the flow rate of the initial stage of precipitation to be drained is preset according to the volume of the rainwater collection pool, and preferably a 3mm discard flow rate is adopted.
In this embodiment, the filter canister uses activated carbon as the adsorption layer of the filter element, and when the resistance of the filter layer reaches 0.04MPa, the reverse operation is requiredWashing and backwashing strength of 10L/m2S, back washing time 4-6 minutes, periodically replacing the activated carbon filter material, generally once in 3-6 months, as the case may be.
In this embodiment, level sensor adopts the level sensor that Jiangsu Honghong electronic technology development limited company produced, the model: 500122.
in this embodiment, the concentration of sodium chlorate in the accommodating box is preferably 5mg/L sodium hypochlorite.
The utility model discloses a working process is:
in the utility model, the water collecting tank is arranged at the top of the periphery of the building or in an open public area and is used for collecting natural rainfall and guiding the natural rainfall into the rainwater collecting tank; the rainwater collection pool is used for collecting and storing rainwater in the plurality of water collection tanks, pollutants or particles in the air can fall and accumulate along with the rainwater in the early stage of rainfall, and the content of pollutants in the rainwater is high, so that the rainwater is not beneficial to treatment and secondary utilization; the rainwater filtering pool is internally provided with filtering equipment for filtering and processing the water led out by the rainwater collecting pool, wherein the equipped pressure sensor is used for detecting the pressure difference between the inside and the outside of the filter element, when the difference exceeds a preset threshold value, the backflushing device is started to backflush the filter element so as to ensure the filtering effect of the filter element, and when the pressure difference after backflushing cannot be recovered within the threshold value, the filter element needs to be replaced; liquid level sensor of system in the rainwater disinfection pond is used for the interior water level change in real-time supervision rainwater disinfection pond, when the water yield of deriving by rainwater filtering ponds reaches the predetermined threshold value of liquid level sensor, then derive holding incasement's sodium hypochlorite solution through the drawing liquid pump, when the flowmeter detects the increment adaptation of the solution flow who derives and water level, then to solenoid valve output control command, make it closed, guarantee that the proportion of sodium hypochlorite and water maintains throughout one more for invariable value, guarantee that moisture is in the weak alkaline state, effectively move to breeding of bacterium, guarantee the cleanness of water.
The utility model discloses in, sewage collecting tank is used for collecting domestic water, and carry out preliminary treatment and deposit at sewage sedimentation tank, domestic water exists its particularity, if wash the dish water, the inside such as wash dish water is rich in a large amount of nitrogen phosphorus element, but do not have the device of special treatment nitrogen phosphorus element at present, if these water are directly arranged outward, then lead to the eutrophication of outside water easily, therefore, constructed wetland has been arranged in its cooperation, plant aquatic plant in constructed wetland, can effectively adsorb nitrogen phosphorus element in the water, the moisture after the sedimentation tank is handled switches on to the one side of intaking of constructed wetland as the supplementary water source, drainage one side of constructed wetland then switches on with sewage filtering ponds and sewage disinfection pond, realize domestic water's filtration and disinfection, and finally lead to in to the clean water basin.
The utility model discloses in, the weather information collection module of installation is used for gathering real-time rainfall information in the corresponding region, when it received rainfall information, then can open the electromagnetic valve of the inside and outside calandria of rainwater collecting pit, and then with old rainwater discharge, empties the rainwater collecting pit, accomodates new precipitation.
Claims (9)
1. Rainwater and domestic water reutilization system, including a clean water basin, the end of intaking in this clean water basin is linked together its characterized in that with the running water pipeline: the front end of the clean water tank is also respectively connected with a rainwater recovery and cleaning system and a domestic water recovery and cleaning system, the rainwater recovery and cleaning system comprises a water collecting tank, a rainwater filtering tank and a rainwater disinfection tank which are sequentially installed, and the water outlet end of the rainwater disinfection tank is communicated with the water inlet end of the clean water tank; clean system is retrieved to domestic water includes sewage collecting pit, sewage sedimentation tank, constructed wetland, sewage filtering ponds and the sewage disinfection pond of installing in order, and the play water end in this sewage disinfection pond and the end of intaking in clean water basin are linked together, the clean water basin collects rainwater and domestic water after handling, and municipal water pipe is supplementary for the clean water basin, and the play water end and the water equipment in this clean water basin are linked together.
2. A rainwater and domestic water secondary utilization system according to claim 1, wherein: the rainwater collecting device is characterized in that the water collecting grooves are respectively arranged on the top of the building and in an open area and used for receiving rainwater, an weather information collecting device is installed in the area where the water collecting grooves are arranged, a weather information collecting module is arranged in the weather information collecting device, and a signal output end of the weather information collecting module is connected with a central control unit.
3. A rainwater and domestic water secondary utilization system according to claim 2, wherein: an outer discharge pipe is installed at the bottom in the rainwater collection pool, an electromagnetic valve and a flowmeter are installed in the outer discharge pipe, and the control end of the electromagnetic valve is communicated with the central control unit.
4. A rainwater and domestic water secondary utilization system according to claim 2, wherein: install in the rainwater filter tank and filter the jar, including interchangeable filter core and recoil ware in this filters the jar, install pressure sensor in filtering the jar, this pressure sensor is used for detecting the pressure differential between the filter core inside and outside, pressure sensor's signal output part is connected with well accuse unit, and well accuse unit is connected with the control end of recoil ware.
5. A rainwater and domestic water secondary utilization system according to claim 2, wherein: install a level sensor and one in the rainwater disinfection pond and embed the holding case that has sodium hypochlorite, level sensor is used for the water level height in the real-time detection rainwater disinfection pond, and this level sensor's signal output part and well accuse unit are connected, holding case system has a liquid outlet, and this liquid outlet is connected with a drawing liquid pump, install flowmeter and solenoid valve in the liquid outlet, the flowmeter is used for detecting the liquid flow who is derived by the holding case.
6. A rainwater and domestic water secondary utilization system according to claim 2, wherein: install in the sewage filter tank and filter the jar, should filter including interchangeable filter core and recoil ware in the jar, install pressure sensor in the jar, this pressure sensor is used for detecting the pressure differential between the filter core inside and outside, pressure sensor's signal output part is connected with well accuse unit, and well accuse unit is connected with the control end of recoil ware.
7. A rainwater and domestic water secondary utilization system according to claim 2, wherein: install a level sensor and one in the sewage disinfection pond and embed the holding case that has sodium hypochlorite, level sensor is used for the water level height in the real-time detection rainwater disinfection pond, and this level sensor's signal output part and well accuse unit are connected, holding case system has a liquid outlet, and this liquid outlet is connected with a drawing liquid pump, install flowmeter and solenoid valve in the liquid outlet, the flowmeter is used for detecting the liquid flow who is derived by the holding case.
8. A rainwater and domestic water secondary utilization system according to claim 2, wherein: the water inlet end in the clean water tank is provided with an electromagnetic valve which can be communicated with a tap water pipeline, the clean water tank is communicated with an external circulation pipeline, a centrifugal pump is arranged at the communication position of the clean water tank and the external circulation pipeline, and the control end of the centrifugal pump is communicated with the central control unit.
9. A rainwater and domestic water secondary utilization system according to claim 2, wherein: aquatic plants are planted in the artificial wetland and are used for absorbing nitrogen and phosphorus elements in the sewage.
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| CN201921054764.3U CN210342077U (en) | 2019-07-08 | 2019-07-08 | Rainwater and domestic water reutilization system |
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| CN201921054764.3U CN210342077U (en) | 2019-07-08 | 2019-07-08 | Rainwater and domestic water reutilization system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110409552A (en) * | 2019-07-08 | 2019-11-05 | 农业农村部环境保护科研监测所 | Rainwater and Domestic water secondary utilize system |
| CN114314940A (en) * | 2022-01-17 | 2022-04-12 | 上海奥栋机电有限公司 | Sewage treatment device |
-
2019
- 2019-07-08 CN CN201921054764.3U patent/CN210342077U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110409552A (en) * | 2019-07-08 | 2019-11-05 | 农业农村部环境保护科研监测所 | Rainwater and Domestic water secondary utilize system |
| CN114314940A (en) * | 2022-01-17 | 2022-04-12 | 上海奥栋机电有限公司 | Sewage treatment device |
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