CN216141427U - Water quality control device and sewage treatment system - Google Patents
Water quality control device and sewage treatment system Download PDFInfo
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- CN216141427U CN216141427U CN202122113074.4U CN202122113074U CN216141427U CN 216141427 U CN216141427 U CN 216141427U CN 202122113074 U CN202122113074 U CN 202122113074U CN 216141427 U CN216141427 U CN 216141427U
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Abstract
The utility model discloses a water quality control device and a sewage treatment system, wherein a first monitoring unit is arranged to monitor the water quality of sewage entering the water quality control device in real time, a PLC (programmable logic controller) control unit acquires the water quality condition of the sewage and controls the opening and closing conditions of a first valve, a second valve and a third valve according to the water quality of the sewage, so that the sewage flows into a biochemical treatment unit directly or flows into a regulating and storing tank first and then flows into the biochemical treatment unit. The regulation and storage tank provides buffer for the biochemical treatment process of sewage, and the sewage quality in the biochemical treatment unit is maintained in a stable interval, so that the purposes of maintaining a reliable sewage treatment process and ensuring a stable sewage treatment effect are achieved.
Description
Technical Field
The application relates to the field of sewage treatment, in particular to a water quality control device and a sewage treatment system.
Background
With the promotion of urbanization process, the sewage treatment system in China needs more and more water types to be treated, and the water quantity to be treated is larger and larger. However, the quality of the influent water of the sewage plant is not stable objectively, for example, the industrial wastewater may include excessive sewage that is stealed by a part of enterprises, and as the area of the urban pipe network expands, the industrial wastewater enters the urban drainage pipe network and reaches the urban sewage treatment plant, the unstable influent water quality has a great influence on the normal operation state of the sewage plant, the sewage plant sometimes has to take measures such as closing the water inlet and prolonging the sewage treatment time, and the measures may cause the treatment flow of the sewage plant to be damaged, the treatment effect to be unstable, and the energy consumption and the treatment cost of the sewage plant to be increased.
SUMMERY OF THE UTILITY MODEL
The present application is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the application provides a water quality control device and a sewage treatment system.
In a first aspect, an embodiment of the present application provides a water quality control device, including: the device comprises a PLC control unit, a first monitoring unit, a regulation and storage tank, a biochemical treatment unit and a precipitation and filtration unit; the first monitoring unit comprises a water inlet pipeline, and the water inlet pipeline is used for leading in sewage; the first monitoring unit is used for monitoring the water quality of the sewage; the first monitoring unit is connected with the regulating and storing tank through a first pipeline, and the first pipeline is provided with a first valve; the regulating and storing tank is connected with the biochemical treatment unit through a second pipeline, and the second pipeline is provided with a second valve; the first monitoring unit is connected with the biochemical treatment unit through a third pipeline, and the third pipeline is provided with a third valve; the PLC control unit is respectively connected with the first monitoring unit, the first valve, the second valve and the third valve; the PLC control unit is used for controlling the switching conditions of the first valve, the second valve and the third valve according to the water quality of the sewage; the biochemical treatment unit is connected with the precipitation filtering unit through a fourth pipeline; the precipitation filtration unit comprises a water outlet pipe for leading out the discharge water.
Optionally, the biochemical treatment unit comprises a water amount monitoring subunit, wherein the water amount monitoring subunit is used for monitoring the water amount of the biochemical treatment unit; the PLC control unit is connected with the water quantity monitoring subunit; and the PLC control unit is used for controlling the switching conditions of the first valve, the second valve and the third valve according to the quality of the sewage and the water quantity of the biochemical treatment unit.
Optionally, the storage tank includes a second monitoring unit, and the second monitoring unit is configured to monitor water quality in the storage tank; the sedimentation and filtration unit is connected with the regulation and storage tank through a return pipeline, and the return pipeline is provided with a fourth valve; the PLC control unit is respectively connected with the second monitoring unit and the fourth valve; and the PLC control unit is also used for controlling the opening and closing condition of the fourth valve according to the water quality in the regulating and storing tank.
Optionally, the storage tank is provided with a sludge discharge pipeline, a vent pipeline, a stirring device and a backwashing device.
Optionally, the first monitoring unit comprises a TN meter and a TP meter.
Optionally, the sedimentation filtration unit comprises at least one of a secondary sedimentation tank, a high-density sedimentation filtration tank, and a membrane bioreactor.
Optionally, the biochemical treatment unit may be used to implement at least one of an AO process, an AAO process, a BAF process, an SBR process, and an MBR process.
Optionally, the biochemical treatment unit and the precipitation filtration unit are both provided with a vent pipe.
In a second aspect, an embodiment of the present application provides a sewage treatment system: the sewage treatment system is provided with the water quality control device according to the first aspect.
The beneficial effects of the embodiment of the application are as follows: the embodiment of the application provides a water quality control device, and the device includes PLC the control unit, first monitor unit, regulation pond, biochemical treatment unit and sediment filter unit. When sewage reaches a sewage treatment plant through a drainage pipe network of a city, the sewage is guided into the water quality control device through the water inlet pipe, and the water quality of the sewage is monitored by the first monitoring unit. The first monitoring unit is connected with the regulating and storing tank through a first pipeline provided with a first valve, the regulating and storing tank is connected with the biochemical treatment unit through a second pipeline provided with a second valve, and the first monitoring unit is connected with the biochemical treatment unit through a third pipeline provided with a third valve. The PLC control unit is respectively connected with the first monitoring unit, the first valve, the second valve and the third valve and is used for controlling the opening and closing conditions of the first valve, the second valve and the third valve according to the quality of the sewage detected by the first monitoring unit; the sewage reaches the biochemical treatment unit through the pipeline for biochemical treatment, the sewage after the biochemical treatment flows into the precipitation filtering unit through the fourth pipeline, the discharged water is obtained through the precipitation filtering treatment, and the discharged water is led out of the water quality control device through the water outlet pipeline. According to the embodiment of the application, the first monitoring unit is arranged, the sewage entering the water quality control device is monitored in real time, the PLC control unit acquires the water quality condition of the sewage, and controls the opening and closing conditions of the first valve, the second valve and the third valve according to the water quality of the sewage, so that the sewage flows into the biochemical treatment unit directly or flows into the regulating and storing tank firstly and then flows into the biochemical treatment unit. The regulation and storage tank provides buffer for the biochemical treatment process of sewage, and the sewage quality in the biochemical treatment unit is maintained in a stable interval, so that the purposes of maintaining a reliable sewage treatment process and ensuring a stable sewage treatment effect are achieved.
Drawings
The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.
Fig. 1 is a schematic view of a water quality control apparatus according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that although functional block divisions are provided in the system drawings and logical orders are shown in the flowcharts, in some cases, the steps shown and described may be performed in different orders than the block divisions in the systems or in the flowcharts. The terms first, second and the like in the description and in the claims, and the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The embodiments of the present application will be further explained with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic view of a water quality control apparatus provided in an embodiment of the present application, where the apparatus 100 includes: the PLC control unit 110, the first monitoring unit 120, the regulation and storage tank 130, the biochemical treatment unit 140 and the precipitation and filtration unit 150; the first monitoring unit comprises a water inlet pipeline 160, the first monitoring unit is connected with the storage tank through a first pipeline 170, and the first pipeline is provided with a first valve 180; the regulation and storage tank is connected with the biochemical treatment unit through a second pipeline 190, and the second pipeline is provided with a second valve 1100; the first monitoring unit is connected with the biochemical treatment unit through a third pipeline 1110, and the third pipeline is provided with a third valve 1120; the biochemical treatment unit is connected with the precipitation filtering unit through a fourth pipeline 1130; the precipitation filtration unit includes an outlet conduit 1140. In fig. 1, the PLC control unit is connected to the first monitoring unit, the first valve, the second valve, and the third valve as indicated by dotted lines. In the embodiment of the application, the water inlet pipeline is used for leading in sewage; the first monitoring unit is used for monitoring the water quality of the sewage; the PLC control unit is used for controlling the opening and closing conditions of the first valve, the second valve and the third valve according to the quality of the sewage; the water outlet pipeline is used for leading out the discharged water.
In the actual sewage treatment process, industrial sewage and domestic sewage in cities can reach a sewage treatment plant through urban underground drainage pipelines, before the sewage treatment plant performs sewage treatment, the sewage is subjected to simple pretreatment, such as cleaning of large sundries in the sewage, and the pretreated sewage needs to be subjected to biochemical treatment and precipitation filtration treatment for several times, so that the standard discharged water can be obtained. As part of discharged water can directly enter rivers and lakes, the quality of sewage treatment in sewage treatment plants directly influences the local ecological environment. However, the sewage treatment plant has a relatively fixed sewage treatment process, taking a biochemical treatment unit as an example: the dosage and the dosing frequency in the biochemical treatment process are determined after a plurality of tests, and when the quality of sewage entering a sewage treatment plant fluctuates greatly, the sewage treatment plant is difficult to effectively clean the sewage according to the existing dosage and dosing frequency, so that the sewage treatment quality is low, and local water pollution is possibly caused. In order to ensure the treatment quality of sewage, a sewage treatment plant may need to stop sewage from entering, increase the dosage and increase the sewage treatment time, which results in energy consumption and labor cost increase.
Based on this, this application embodiment provides the water quality control device that figure 1 shows, when sewage preliminary treatment is accomplished, can get into water quality control device through the inlet channel, and first monitoring unit carries out real-time supervision to the quality of water of sewage, and the monitoring result of first monitoring unit is gathered to the PLC control unit to the on-off condition of each valve is controlled according to the testing result.
For example, if the monitoring result shows that the quality of the sewage is good and the pollution level is lower than the preset first pollution threshold, it indicates that the current sewage treatment process (for example, the processes such as the dosage and the dosage times of the biochemical treatment unit, or the settling time of the settling and filtering unit) can take the treatment task of the current sewage and achieve a good pollution purification effect, the PLC control unit confirms the opening and closing of each valve one by one, controls the first valve and the second valve to close, controls the third valve to open, and then the sewage can enter the biochemical treatment unit through the third pipeline for biochemical treatment. And the sewage after the biochemical treatment can enter the precipitation filtering unit through the fourth pipeline for precipitation filtering treatment to finally obtain the discharge water meeting the discharge standard, and the discharge water is discharged out of the water quality control device through the water outlet pipeline.
Similarly, when the monitoring result shows that the quality of the sewage is poor and the pollution degree is heavier than the preset first pollution threshold, it is indicated that the pollution degree of the sewage in the current state exceeds the maximum threshold which can be borne by the sewage treatment process, and if the sewage is still directly led into the biochemical treatment unit, the quality of the sewage treatment can be reduced, so that the PLC control unit can control the third valve to be opened and control the first valve and the second valve to be opened, the sewage with serious pollution can enter the regulating and storing tank in advance, and the PLC control unit can control the water volume in the second pipeline by controlling the opening degree of the second valve, thereby controlling the sewage volume entering the biochemical treatment unit. That is to say, the regulation pond provides a buffering for the biochemical treatment unit, can maintain the water yield that gets into water quality control device (flow in through the inlet channel), can carry out the control of certain degree again to the water yield that gets into the biochemical treatment unit (flow in through the second pipeline) to reach the pollution degree that makes sewage among the biochemical treatment unit and maintain a comparatively stable scope, can let the biochemical treatment unit continuously realize better purifying effect reliably. Similarly, the sewage after the biochemical treatment can enter the precipitation filtering unit through the fourth pipeline for precipitation filtering treatment, and finally the discharge water meeting the discharge standard is obtained.
Through the content, the embodiment of the application provides a water quality control device, through setting up first monitoring unit, carry out real-time water quality monitoring to the sewage that gets into water quality control device, the PLC control unit obtains the quality of water condition of sewage to according to the switching condition of sewage quality control first valve, second valve and third valve, let sewage flow in and directly flow into biochemical treatment unit or flow into the regulation pond earlier and flow into biochemical treatment unit. The regulation and storage tank provides buffer for the biochemical treatment process of sewage, and the sewage quality in the biochemical treatment unit is maintained in a stable interval, so that the purposes of maintaining a reliable sewage treatment process and ensuring a stable sewage treatment effect are achieved. Through first monitor cell and PLC the control unit, this application embodiment realizes the nimble control to the sewage quality of quality that gets into biochemical treatment unit, and PLC the control unit automatic operation helps reducing the cost of manpower inspection, has good industrialization application prospect.
In some embodiments, the biochemical treatment unit includes a water amount monitoring subunit for monitoring a water amount of the biochemical treatment unit; the PLC control unit is connected with the water quantity monitoring subunit. In this application embodiment, when the first monitoring unit monitors that the pollution degree of the sewage of the water inlet pipeline exceeds a preset first pollution threshold value, the PLC control unit controls the third valve to be closed, the first valve is opened, and at this time, the sewage enters the storage tank along the first pipeline. In addition, the second monitoring unit can also monitor the current water amount of the biochemical treatment unit, and when the second monitoring unit monitors that the water amount of the biochemical treatment unit is still in the load range, the second valve is opened, and the sewage flows from the regulating storage tank to the biochemical treatment unit along the second pipeline for biochemical treatment. Conversely, when the second monitoring unit monitors that the biochemical treatment unit is operated at full load and can not treat more sewage, the second valve is kept closed or closed, and the regulation and storage tank can not convey the sewage to the biochemical treatment unit. In an actual application scene, if the biochemical treatment unit continuously runs at full load, the PLC control unit can also reflect the current state to the upper computer, so that a worker can adjust the water inlet speed or the sewage treatment intensity in time.
In some embodiments, the storage tank is provided with a sludge discharge pipe, a blow-down pipe, a stirring device and a back-flushing device. Wherein, arrange the mud pipeline and be arranged in discharging the silt that mixes in the sewage that flows in, avoid including too much mud in the sewage to block up the second pipeline, perhaps influence biochemical treatment unit's sewage treatment effect. The blow-down pipeline generally sets up the bottom at the regulation pond, needs the maintenance or the sunning when the regulation pond, and then the sewage in the regulation pond can be discharged through blow-down pipeline fast. The stirring device is used for refluxing the effluent after precipitation and filtration to the storage tank to stir and mix the sewage which is subjected to overproof pretreatment, so that the stability of the water quality in the storage tank is facilitated, and the stability of data measurement of a PLC (programmable logic controller) water inlet and outlet real-time control system is facilitated; in addition, the back washing device comprises a back washing water pump, a clear water pipeline and a back washing water head, and is generally used for cleaning the tank body of the storage tank, thereby being beneficial to preventing garbage from blocking the pipe orifice.
Similarly, in other embodiments, the biochemical treatment unit and the precipitation filtration unit are provided with emptying pipelines which are also used for quickly emptying water reserved in the biochemical treatment unit and the precipitation filtration unit, so that the regular overhaul is facilitated for workers.
In some embodiments, the biochemical treatment unit may include one or more biochemical treatment tanks, which may be used to implement at least one of, but not limited to, AO Process (Anaerobic aerobic Process), AAO Process (Anaerobic aerobic Process), BAF Process (Biological Aerated Filter), SBR Process (Sequencing Batch Reactor Activated Sludge Process), and MBR Process (Membrane bioreactor), which are mainly to perform denitrification and dephosphorization treatment on the wastewater to remove organic matter in the wastewater.
In some embodiments, the precipitation filtration unit may comprise at least one of a secondary sedimentation tank, a high-density precipitation filtration tank, a membrane bioreactor. For example, the secondary sedimentation tank can clarify the sewage after biochemical treatment and concentrate the sludge in the sewage to achieve the effect of sludge-water separation. For another example, the membrane bioreactor intercepts activated sludge and macromolecular organic matters in the sewage after biochemical treatment through an MBR membrane, and realizes an efficient decontamination effect.
In some embodiments, the first monitoring unit may include a TN meter and a TP meter. The TN determinator is used for determining the total nitrogen content in the sewage, and the total nitrogen comprises organic nitrogen and inorganic nitrogen; and the TP tester is used for measuring the total phosphorus content in the sewage. In actual life, chemical fertilizers, agricultural wastes or detergents used in life can generate sewage with high-concentration nitrogen and phosphorus, and the sewage can easily cause water eutrophication and seriously threaten local water. Therefore, the first monitoring unit needs to monitor the nitrogen and phosphorus content of the sewage entering the water inlet pipeline, so that whether the sewage needs to enter the regulation and storage tank for buffering is evaluated.
Through the content, the embodiment of the application provides that the automatic control of the sewage treatment process is realized by additionally arranging the PLC control unit, and the stable control of the water amount entering the biochemical treatment unit is realized by additionally arranging the regulating and storing tank. For some larger sewage treatment plants, the daily treated sewage tonnage is huge, and if the buffer storage of the sewage entering the biochemical treatment unit is to be realized, a plurality of regulating storage tanks or a regulating storage tank with larger capacity is required to be added, which has higher requirements for the field of the sewage treatment plant. In addition, because the regulation and storage tank is used for storing high-concentration sewage, when the sewage concentration in the regulation and storage tank is higher, the difficulty that the PLC control unit controls the water quantity flowing to the biochemical treatment unit in the regulation and storage tank is also improved to some extent. Therefore, the embodiment of the present application also proposes to solve the above problem by adding a return pipe.
In some embodiments, referring to fig. 1, the storage tank in the embodiments of the present application further includes a second monitoring unit, the sedimentation filter unit is connected to the storage tank through a return pipe 1150, and the return pipe is provided with a fourth valve 1160; in fig. 1, the dashed lines indicate that the PLC control unit is connected to the second monitoring unit and the fourth valve, respectively. In the embodiment of the application, the second monitoring unit is used for monitoring the water quality in the regulating and storing tank; the PLC control unit is also used for controlling the on-off condition of the fourth valve according to the water quality in the regulating and storing tank.
Specifically, when sewage enters the regulation and storage tank, the second monitoring unit monitors the water quality in the regulation and storage tank in real time, if the sewage pollution degree in the regulation and storage tank is very serious and exceeds a preset second pollution threshold (it can be understood that the second pollution threshold here should be higher than the first pollution threshold mentioned above), the PLC control unit opens the fourth valve according to the monitoring result of the second monitoring unit, and then the discharge water after biochemical treatment and sedimentation and filtration treatment flows into the regulation and storage tank along the backflow pipeline to dilute the sewage in the regulation and storage tank. In some large sewage treatment plants, the regulation and storage tank with smaller capacity can also play a corresponding buffering role.
In other embodiments, in order to save energy, when the second monitoring unit monitors that the water pollution degree in the storage tank has fallen below the second pollution threshold, the PLC control unit may control the fourth valve to close, stop the backflow process, and save energy on the basis of completing the dilution of the storage tank.
And it can be understood that, in the practical application scenario, the backflow process mentioned in the above does not necessarily need to be triggered by the sewage pollution degree in the regulation and storage tank, for the water quality control device which continuously works for a long time, the fourth valve can be in a long-term open state, the discharged water after biochemical treatment and sedimentation and filtration treatment flows to the regulation and storage tank through the backflow pipeline, and the sewage in the regulation and storage tank is diluted, so that the purpose of reducing the regulation and storage pressure of the regulation and storage tank is achieved.
In addition, the embodiment of the present application further provides a sewage treatment system, which is provided with the water quality control device described in the above embodiment, when urban sewage enters the sewage treatment system through an urban pipe network, the urban sewage is pretreated first, the pretreated sewage enters the water quality control device through a water inlet pipe, the first monitoring unit monitors the water quality of the sewage by using a TN detector and a TP detector, when the nitrogen and phosphorus content in the sewage exceeds a preset pollution threshold, for example, TN is greater than 50mg/L, TP is greater than 6 mg/L, the PLC control unit closes the third valve, opens the first valve, the sewage enters the regulating and storing tank, and the water quantity monitoring subunit detects the water quantity of the biochemical treatment unit, if the sewage load quantity of the current biochemical unit does not reach the maximum value, the PLC control unit controls to open the second valve, the sewage flows from the regulating and storing tank to the biochemical treatment unit along the second pipe, and when the second monitoring unit monitors that the sewage pollution degree in the storage tank is serious, part of the discharged water flows back to the storage tank through the backflow pipeline to be diluted. The sewage treatment system in the embodiment of the application is provided with the regulation and storage tank, provides buffering for the biochemical treatment process of sewage, and makes the sewage quality in the biochemical treatment unit maintain a comparatively stable interval, thereby achieving the purposes of maintaining a reliable sewage treatment process and ensuring a stable sewage treatment effect. Moreover, the system is provided with a return pipeline, so that the pressure of the regulation and storage tank can be effectively reduced. In addition, the system passes through first monitor unit and PLC the control unit, and this application embodiment realizes the nimble control to the sewage quality of getting into the biochemical treatment unit, and PLC the control unit automatic operation helps reducing the cost of manpower inspection, possess good industrialization development prospect.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope of the present invention defined by the claims.
Claims (9)
1. A water quality control device, comprising: the device comprises a PLC control unit, a first monitoring unit, a regulation and storage tank, a biochemical treatment unit and a precipitation and filtration unit;
the first monitoring unit comprises a water inlet pipeline, and the water inlet pipeline is used for leading in sewage;
the first monitoring unit is used for monitoring the water quality of the sewage;
the first monitoring unit is connected with the regulating and storing tank through a first pipeline, and the first pipeline is provided with a first valve;
the regulating and storing tank is connected with the biochemical treatment unit through a second pipeline, and the second pipeline is provided with a second valve;
the first monitoring unit is connected with the biochemical treatment unit through a third pipeline, and the third pipeline is provided with a third valve;
the PLC control unit is respectively connected with the first monitoring unit, the first valve, the second valve and the third valve;
the PLC control unit is used for controlling the switching conditions of the first valve, the second valve and the third valve according to the water quality of the sewage;
the biochemical treatment unit is connected with the precipitation filtering unit through a fourth pipeline;
the precipitation filtration unit comprises a water outlet pipe for leading out the discharge water.
2. The water quality control apparatus according to claim 1, characterized in that:
the biochemical treatment unit comprises a water quantity monitoring subunit, and the water quantity monitoring subunit is used for monitoring the water quantity of the biochemical treatment unit;
the PLC control unit is connected with the water quantity monitoring subunit;
and the PLC control unit is used for controlling the switching conditions of the first valve, the second valve and the third valve according to the quality of the sewage and the water quantity of the biochemical treatment unit.
3. The water quality control apparatus according to claim 1, characterized in that:
the regulating and storing tank comprises a second monitoring unit, and the second monitoring unit is used for monitoring the water quality in the regulating and storing tank;
the sedimentation and filtration unit is connected with the regulation and storage tank through a return pipeline, and the return pipeline is provided with a fourth valve;
the PLC control unit is respectively connected with the second monitoring unit and the fourth valve;
and the PLC control unit is also used for controlling the opening and closing condition of the fourth valve according to the water quality in the regulating and storing tank.
4. A water quality control apparatus according to any one of claims 1 to 3, characterized in that:
the regulation and storage tank is provided with a sludge discharge pipeline, an emptying pipeline, a stirring device and a back washing device.
5. A water quality control apparatus according to any one of claims 1 to 3, characterized in that:
the first monitoring unit includes a TN determinator and a TP determinator.
6. A water quality control apparatus according to any one of claims 1 to 3, characterized in that:
the precipitation filtering unit comprises at least one of a secondary precipitation tank, a high-density precipitation filtering tank and a membrane bioreactor.
7. A water quality control apparatus according to any one of claims 1 to 3, characterized in that:
the biochemical treatment unit may be used to implement at least one of an AO process, an AAO process, a BAF process, an SBR process, and an MBR process.
8. A water quality control apparatus according to any one of claims 1 to 3, characterized in that:
and the biochemical treatment unit and the precipitation filtering unit are both provided with emptying pipelines.
9. A sewage treatment system is characterized in that: the sewage treatment system is provided with the water quality control device according to claims 1-8.
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| CN202122113074.4U CN216141427U (en) | 2021-09-02 | 2021-09-02 | Water quality control device and sewage treatment system |
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| CN202122113074.4U CN216141427U (en) | 2021-09-02 | 2021-09-02 | Water quality control device and sewage treatment system |
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| CN216141427U true CN216141427U (en) | 2022-03-29 |
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