Energy-saving rural domestic sewage resource utilization and sewage treatment equipment

Abstract

The invention discloses energy-saving rural domestic sewage resource utilization and sewage treatment equipment, and relates to the technical field of sewage treatment. Comprising a sewage treatment device body, and the interior of the sewage treatment device body is divided into a first treatment pond and a second treatment pond through a vertically-arranged partition plate; the pretreatment unit comprises an adjusting tank with a grating at the top and a pre-caisson, the pre-caisson is mounted in one end of the sewage treatment device body, and the adjusting tank is mounted on the outer side of the sewage treatment device body and is communicated with the interior of the pre-caisson; the biological treatment unit is mounted in the first treatment tank and is communicated with the pre-caisson; the membrane separation unit is mounted in the second treatment tank; the precipitation treatment unit is positioned in the sewage treatment device body and is positioned at the bottoms of the first treatment tank and the second treatment tank. The invention provides equipment which is efficient, energy-saving, easy to maintain and suitable for rural domestic sewage treatment.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to energy-saving rural domestic sewage resource utilization sewage treatment equipment. Background Art

[0002] With the rapid development of the rural economy and the improvement of residents' living standards, the discharge of rural domestic sewage has increased year by year, bringing great pressure to the rural environment. Traditional sewage treatment methods often have problems such as low treatment efficiency, high energy consumption, and large land occupation. In addition, the water quality after treatment is difficult to meet the discharge standards, and it is impossible to reuse water resources. At the same time, sewage treatment facilities in rural areas often lack professional maintenance, resulting in frequent equipment failures and unstable operation.

[0003] Most of the existing rural sewage treatment equipment adopts a single biological treatment or physical treatment method, which has limited treatment effect and is difficult to adapt to the changes in different water quality and discharge requirements. In addition, although some equipment has certain treatment functions, due to unreasonable design, it leads to high energy consumption and high maintenance costs, making it difficult to be widely promoted in rural areas.

[0004] Therefore, developing an efficient, energy-saving, easy-to-maintain equipment suitable for rural domestic sewage treatment has become an urgent problem to be solved. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides an energy-saving rural domestic sewage resource utilization sewage treatment equipment, which aims to achieve resource utilization of sewage by optimizing the equipment structure, improving treatment efficiency, reducing energy consumption.

[0006] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0007] The present invention is an energy-saving rural domestic sewage resource utilization sewage treatment equipment, comprising:

[0008] A sewage treatment device body, wherein the interior of the sewage treatment device body is divided into a first treatment tank and a second treatment tank by a vertically arranged partition, and the first treatment tank and the second treatment tank are connected at the lower ends;

[0009] A pretreatment unit, the pretreatment unit comprising a regulating tank with a grid on the top and a pre-cemented tank, the pre-cemented tank being installed inside one end of the sewage treatment device body, the regulating tank being installed outside the sewage treatment device body and being connected to the inside of the pre-cemented tank;

[0010] A biological treatment unit, the biological treatment unit is installed in the first treatment tank and is connected to the pre-sediment tank;

[0011] A membrane separation unit, wherein the membrane separation unit is installed in the second treatment tank;

[0012] A sedimentation treatment unit is located inside the sewage treatment device body and at the bottom of the first treatment tank and the second treatment tank.

[0013] As a preferred technical solution of the present invention, two observation ports are arranged on the top of the sewage treatment device body, and the observation ports are respectively located on the top of the first treatment tank and the top of the second treatment tank.

[0014] As a preferred technical solution of the present invention, a through pipe is provided on one side of the regulating tank, the through pipe is connected to the pre-sinking box, and the grille on the top of the regulating tank is detachable.

[0015] As a preferred technical solution of the present invention, a pre-sinking part is provided at one end of the sewage treatment device body, the pre-sinking box is detachably installed on the pre-sinking part, and the pre-sinking box includes a box body and a top cover, and a handle is provided on the top cover.

[0016] As a preferred technical solution of the present invention, a wavy sand baffle is arranged inside the box body, the top of the sand baffle is fixedly connected to the lower surface of the box cover, and a water channel for water flow to pass through is left between the lower end of the sand baffle and the bottom of the box body.

[0017] As a preferred technical solution of the present invention, the anaerobic zone and the aerobic zone of the biological treatment unit are separated by a partition plate, and the partition plate is provided with a channel for water flow and microbial exchange, a sphere filled with biological filler is arranged in the biological treatment unit, and a water hole is arranged on the side wall of the biological treatment unit.

[0018] As a preferred technical solution of the present invention, the membrane separation unit includes several groups of sewage treatment membrane components, and is located below the observation port. The sewage treatment membrane components can be disassembled and installed through the observation port for easy cleaning.

[0019] As a preferred technical solution of the present invention, the precipitation treatment unit comprises:

[0020] Branch pipes, which are provided in parallel at the bottom of the sewage treatment device body, and are uniformly and densely covered with sewage suction ports;

[0021] The main pipe is located outside the sewage treatment device body, and the branch pipe is connected to the main pipe.

[0022] As a preferred technical solution of the present invention, a section of the sewage treatment device body is provided with a water outlet, and the water outlet is provided with a water outlet pipe connected to a water pump. At the same time, the water pump is also connected to the main pipe, and a valve is provided on the main pipe.

[0023] As a preferred technical solution of the present invention, a micro dosing port is provided at the top of one end of the water outlet of the sewage treatment device body for adding chemical agents to adjust and treat water quality.

[0024] The present invention has the following beneficial effects:

[0025] By setting up a pretreatment unit, the suspended solids and particulate matter in the sewage are effectively removed, the burden of the subsequent treatment unit is reduced, and the overall treatment efficiency is significantly improved. At the same time, the biological treatment unit adopts anaerobic-aerobic process combined with biological fillers, which not only improves the biological treatment efficiency but also reduces energy consumption. The setting of the membrane separation unit further improves the effluent quality and realizes the deep treatment of sewage. In addition, the sedimentation treatment unit effectively collects sediments to avoid secondary pollution. The equipment design is easy to maintain and manage, reducing the operating cost. The setting of the dosing port enables the equipment to flexibly adjust the treatment process, enhancing adaptability and flexibility.

[0026] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0030] Figure 3 It is a front view of the present invention;

[0031] Figure 4 It is a layout view of the branch pipes of the sedimentation treatment unit in the present invention;

[0032] Figure 5 A top view of the present invention;

[0033] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0034] 1- sewage treatment unit body, 11- partition, 12- observation port; 2- grille; 3- regulating tank, 4- pre-seduce tank, 41- box body, 42- sand retaining plate; 5- biological treatment unit; 6- membrane separation unit; 7- sedimentation treatment unit, 71- branch pipe, 72- main pipe; 8- outlet pipe; 9- dosing port. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "all around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0037] Embodiment 1

[0038] like Figure 1-3 As shown: The present invention provides an energy-saving rural domestic sewage resource utilization sewage treatment equipment, comprising:

[0039] A sewage treatment device body 1, wherein the interior of the sewage treatment device body 1 is divided into a first treatment tank and a second treatment tank by a vertically arranged partition 11, and the first treatment tank and the second treatment tank are connected at the lower ends;

[0040] The pretreatment unit includes a regulating tank 3 with a grille 2 on the top and a pre-cemented tank 4. The pre-cemented tank 4 is installed inside one end of the sewage treatment device body 1. The regulating tank 3 is installed outside the sewage treatment device body 1 and is connected to the inside of the pre-cemented tank 4.

[0041] Biological treatment unit 5, biological treatment unit 5 is installed in the first treatment tank and is connected with the pre-sediment tank 4;

[0042] A membrane separation unit 6 is installed in the second treatment tank;

[0043] The sedimentation treatment unit 7 is located inside the sewage treatment device body 1 and at the bottom of the first treatment tank and the second treatment tank.

[0044] This embodiment provides an energy-saving rural domestic sewage resource utilization sewage treatment equipment, which realizes effective sewage treatment and resource utilization through a series of treatment units. The following is a detailed description of each part:

[0045] Sewage treatment device body 1: The main structural part of the equipment, which is divided into a first treatment tank and a second treatment tank by a vertical partition 11. The two treatment tanks are connected at the lower end, allowing the treated water to flow from the first treatment tank into the second treatment tank for further treatment.

[0046] Pretreatment unit: includes a regulating tank 3 with a grille 2 on the top and a pre-sediment tank 4. The grille 2 is used to remove large impurities in the sewage, such as plastic bags, leaves, etc., to prevent them from entering the subsequent treatment unit and causing blockage. The regulating tank 3 is located outside the sewage treatment unit body 1, and is used to adjust the flow and water quality of the sewage to make it more stable and convenient for subsequent treatment. The regulating tank 3 is connected to the inside of the pre-sediment tank 4, allowing the sewage that has been preliminarily adjusted to flow into the pre-sediment tank 4. The pre-sediment tank 4 is installed inside one end of the sewage treatment unit body 1, and is used to further remove suspended matter and some organic matter in the sewage, reducing the burden on the subsequent biological treatment unit.

[0047] Biological treatment unit 5: installed in the first treatment tank and connected to the pre-sedimentation tank 4. It uses the metabolism of microorganisms to remove organic matter, nitrogen, phosphorus and other pollutants in the sewage. The biological treatment unit usually adopts activated sludge method, biofilm method and other processes. The specific selection depends on the characteristics of the sewage and the treatment requirements.

[0048] Membrane separation unit 6: Installed in the second treatment tank. Through membrane technology (such as ultrafiltration, nanofiltration, reverse osmosis, etc.), it further removes suspended matter, colloids, bacteria, viruses and other tiny particles in the sewage to improve the effluent quality. The membrane separation unit is the key link to achieve deep sewage treatment.

[0049] Sedimentation treatment unit 7: located inside the sewage treatment unit body 1 and at the bottom of the first treatment tank and the second treatment tank. Used to remove sludge and sediment generated by the biological treatment unit and the membrane separation unit. The sedimentation treatment unit usually includes a sludge hopper and a sludge discharge pipe to facilitate the collection and discharge of sludge.

[0050] In summary, the energy-saving rural domestic sewage resource utilization sewage treatment equipment provided in this embodiment realizes the effective treatment and resource utilization of rural domestic sewage through multiple links such as pretreatment, biological treatment, membrane separation and sedimentation treatment. The equipment has a compact structure, high treatment efficiency and good effluent quality, and is suitable for sewage treatment and reuse in rural areas.

[0051] Embodiment 2

[0052] Based on the first embodiment, the difference of this embodiment is that:

[0053] like Figure 1As shown: Two observation ports 12 are provided on the top of the sewage treatment device body 1, and the observation ports 12 are respectively located at the top of the first treatment tank and the second treatment tank. A through pipe is provided on one side of the regulating tank 3, and the through pipe is connected to the pre-settling tank 4, and the grille 2 on the top of the regulating tank 3 is detachable. A pre-settling part is provided at one end of the sewage treatment device body 1, and the pre-settling tank 4 is detachably installed on the pre-settling part, and the pre-settling tank 4 includes a box body 41 and a top cover, and a handle is provided on the top cover. A wavy sand retaining plate 42 is provided inside the box body 41, and the top of the sand retaining plate 42 is fixedly connected to the lower surface of the box cover, and a waterway for water flow to pass through is left between the lower end of the sand retaining plate 42 and the bottom of the box body 41.

[0054] This embodiment is further optimized and improved based on the first embodiment: two observation ports 12 are added to the top of the sewage treatment device body 1, and the two observation ports are respectively located at the top of the first treatment tank and the second treatment tank. This design enables the operator to conveniently observe the sewage treatment conditions in the two treatment tanks, including water quality changes, sludge accumulation, etc., so as to adjust the treatment parameters or perform necessary maintenance in a timely manner.

[0055] A through pipe is provided on one side of the regulating tank 3, which is directly connected to the pre-cement tank 4, ensuring that sewage can flow smoothly from the regulating tank into the pre-cement tank for further treatment. This connection method simplifies the pipeline layout and reduces the complexity of the equipment.

[0056] The grille 2 on the top of the regulating tank 3 is designed to be detachable, which is convenient for operators to clean and maintain. When more impurities and dirt accumulate on the grille, it can be easily removed for cleaning or replacement, ensuring the continuous and effective operation of the grille.

[0057] A pre-sinking part is arranged at one end of the sewage treatment device body 1, and the pre-sinking tank 4 is detachably mounted on the pre-sinking part. This design enables the pre-sinking tank to be easily removed when maintenance or replacement is required, thus reducing maintenance costs and time.

[0058] The pre-caisson 4 includes a box body 41 and a top cover, and a handle is provided on the top cover to facilitate the operator to open and close. This design improves the operating convenience of the equipment. A wavy sand baffle 42 is provided inside the box body 41, and the top of the sand baffle is fixedly connected to the lower surface of the box cover. The wavy sand baffle can increase the residence time and turbulence of the water flow in the box body, which is conducive to the sedimentation and removal of suspended matter. At the same time, a waterway for water flow to pass through is left between the lower end of the sand baffle and the bottom of the box body, ensuring the smooth passage of water flow.

[0059] In summary, this embodiment further improves the treatment efficiency, operation convenience and maintainability of the sewage treatment equipment by adding observation ports, optimizing the connection between the regulating tank and the pre-caisson, designing a detachable grille, and improving the structure of the pre-caisson. These improvements make the equipment more suitable for sewage treatment needs in rural areas.

[0060] Embodiment 3

[0061] The difference between the first embodiment and the second embodiment is that:

[0062] like Figure 1 The anaerobic zone and the aerobic zone of the biological treatment unit 5 are separated by a partition plate, and a channel for water flow and microorganism exchange is provided on the partition plate. A sphere filled with biological filler is provided in the biological treatment unit 5, and a water hole is provided on the side wall of the biological treatment unit 5. The membrane separation unit 6 includes a plurality of sewage treatment membrane assemblies, and is located below the observation port 12. The sewage treatment membrane assemblies can be disassembled and installed through the observation port 12 for easy cleaning.

[0063] This embodiment has made more in-depth technical improvements based on the first embodiment, mainly focusing on the optimized design of the biological treatment unit 5 and the membrane separation unit 6. The interior of the biological treatment unit 5 is cleverly divided into an anaerobic zone and an aerobic zone by a partition plate. This design not only achieves the separation of different biological treatment environments, but also helps to optimize the growth conditions of microorganisms, thereby improving the efficiency of sewage treatment. Channels for water flow and microbial exchange are specially set on the partition plate. These channels allow water flow to flow freely between the two areas, while promoting the migration and exchange of microorganisms between the anaerobic zone and the aerobic zone, which helps to form a richer microbial community and improve the treatment effect. Spheres filled with biological fillers are innovatively set in the biological treatment unit 5. These spheres not only provide a surface area for microorganisms to attach, but also enhance the contact and reaction between water flow and microorganisms through their special structure and movement mode, further improving the efficiency of biological treatment. Water holes are carefully designed on the side walls of the biological treatment unit 5. These channels ensure that water flow can enter and flow out of the biological treatment unit evenly and smoothly, avoiding the occurrence of water flow short circuits and dead zones, thereby ensuring the treatment effect.

[0064] Modular design of sewage treatment membrane components: The membrane separation unit 6 adopts a modular design of several groups of sewage treatment membrane components. This design is not only easy to install and disassemble, but also makes the cleaning and maintenance of the membrane components simpler and more efficient. These membrane components are cleverly placed below the observation port 12. Through this design, operators can easily disassemble and install the membrane components through the observation port without additional tools and equipment, which greatly reduces the difficulty and cost of cleaning and maintenance.

[0065] In summary, this embodiment further improves the treatment efficiency, operation convenience and maintainability of the sewage treatment equipment by optimizing the design of the biological treatment unit 5 and the membrane separation unit 6. These improvements make the equipment more efficient, reliable and easy to maintain in treating rural domestic sewage, providing more advanced technical support for sewage treatment and resource utilization in rural areas.

[0066] Embodiment 4

[0067] Based on the second embodiment, the difference of this embodiment is that:

[0068] like Figure 4 As shown: the sedimentation treatment unit 7 includes: a branch pipe 71, which has several branches and is arranged in parallel at the bottom of the sewage treatment device body 1, and the branch pipe 71 is evenly and densely covered with sewage suction ports; a main pipe 72, which is located outside the sewage treatment device body 1, and the branch pipe 71 is connected to the main pipe 72. A water outlet is provided at one section of the sewage treatment device body 1, and the water outlet is provided with a water outlet pipe 8 connected to a water pump. At the same time, the water pump is also connected to the main pipe 72, and a valve is provided on the main pipe 72. A micro-dosing port 9 is provided at the top of one end of the water outlet of the sewage treatment device body 1, which is used to add chemical agents to adjust and treat water quality. This embodiment has made further technical innovations based on the second embodiment, mainly focusing on the optimized design of the sedimentation treatment unit 7, and introducing the micro-dosing port 9 to adjust the water quality. Design of the branch pipe 71 and the sewage suction port: the sedimentation treatment unit 7 includes several branch pipes 71 arranged in parallel at the bottom of the sewage treatment device body 1, and these branch pipes are evenly and densely covered with sewage suction ports. This design enables sludge and sediment to be collected more effectively, avoiding the problem of uneven sludge deposition and difficulty in removal in traditional sedimentation tanks. At the same time, the densely distributed sewage suction ports ensure the comprehensiveness and efficiency of sludge collection. The connection between the main pipe 72 and the branch pipe 71: All branch pipes 71 are connected to the main pipe 72 located outside the sewage treatment device body 1. The main pipe 72 serves as the main channel for sludge collection and transportation, which simplifies the structure of the sludge treatment system and improves the efficiency of sludge treatment. A water outlet is set at one end of the sewage treatment device body 1, and the water outlet is connected to the pump through the outlet pipe 8. At the same time, the pump is also connected to the main pipe 72. This design allows the pump to be started when necessary to pump out the sludge from the main pipe 72, and the treated clean water can also be pumped out through the outlet pipe 8. This flexible configuration improves the operating convenience and treatment efficiency of the equipment. A valve is set on the main pipe 72 to control the discharge and treatment of sludge. By adjusting the opening of the valve, the discharge amount and discharge time of the sludge can be accurately controlled, thereby achieving precise control of the sludge treatment process.

[0069] A micro dosing port 9 is provided at the top of one end of the water outlet of the sewage treatment device body 1. This dosing port is used to add chemical agents to adjust and treat the water quality. For example, disinfectants can be added to kill bacteria and viruses in the water, or coagulants can be added to accelerate the sedimentation of suspended matter. Through the precise dosing of the micro dosing port 9, the effluent quality can be further improved to meet more stringent discharge standards or reuse water quality requirements.

[0070] In summary, this embodiment further improves the treatment efficiency, operation convenience and effluent quality of the sewage treatment equipment by optimizing the design of the sedimentation treatment unit 7 and introducing the micro-dosing port 9. These improvements make the equipment more efficient, flexible and reliable in treating rural domestic sewage, and provide more advanced technical support for sewage treatment and resource utilization in rural areas.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0072] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An energy-saving rural domestic sewage resource utilization sewage treatment equipment, characterized in that: include: A sewage treatment device body, wherein the interior of the sewage treatment device body is divided into a first treatment tank and a second treatment tank by a vertically arranged partition, and the first treatment tank and the second treatment tank are connected at the lower ends; A pretreatment unit, the pretreatment unit comprising a regulating tank with a grid on the top and a pre-cemented tank, the pre-cemented tank being installed inside one end of the sewage treatment device body, the regulating tank being installed outside the sewage treatment device body and being connected to the inside of the pre-cemented tank; A biological treatment unit, the biological treatment unit is installed in the first treatment tank and is connected to the pre-sediment tank; A membrane separation unit, wherein the membrane separation unit is installed in the second treatment tank; A sedimentation treatment unit is located inside the sewage treatment device body and at the bottom of the first treatment tank and the second treatment tank.

2. According to claim 1, an energy-saving rural domestic sewage resource utilization sewage treatment equipment is characterized in that: Two observation ports are arranged on the top of the sewage treatment device body, and the observation ports are respectively located on the top of the first treatment tank and the top of the second treatment tank.

3. The energy-saving rural domestic sewage resource utilization sewage treatment equipment according to claim 1 is characterized in that: A through pipe is arranged on one side of the regulating tank, the through pipe is communicated with the pre-sinking box, and the grille on the top of the regulating tank is detachable.

4. The energy-saving rural domestic sewage resource utilization sewage treatment equipment according to claim 1 is characterized in that: A pre-sinking part is arranged at one end of the sewage treatment device body, and the pre-sinking box is detachably installed on the pre-sinking part. The pre-sinking box comprises a box body and a top cover, and a handle is arranged on the top cover.

5. The energy-saving rural domestic sewage resource utilization sewage treatment equipment according to claim 4 is characterized in that: A wave-shaped sand baffle is arranged inside the box body, the top of the sand baffle is fixedly connected to the lower surface of the box cover, and a water channel for water flow to pass through is reserved between the lower end of the sand baffle and the bottom of the box body.

6. The energy-saving rural domestic sewage resource utilization sewage treatment equipment according to claim 1 is characterized in that: The anaerobic zone and the aerobic zone of the biological treatment unit are separated by a partition plate, and a channel for water flow and microorganism exchange is provided on the partition plate. A sphere filled with biological filler is arranged in the biological treatment unit, and a water hole is arranged on the side wall of the biological treatment unit.

7. The energy-saving rural domestic sewage resource utilization sewage treatment equipment according to claim 2 is characterized in that: The membrane separation unit includes a plurality of groups of sewage treatment membrane components, and is located below the observation port. The sewage treatment membrane components can be disassembled and installed through the observation port, which is convenient for cleaning.

8. The energy-saving rural domestic sewage resource utilization sewage treatment equipment according to claim 1 is characterized in that: The precipitation treatment unit comprises: Branch pipes, which are provided in parallel at the bottom of the sewage treatment device body, and are uniformly and densely covered with sewage suction ports; The main pipe is located outside the sewage treatment device body, and the branch pipe is connected to the main pipe.

9. The energy-saving rural domestic sewage resource utilization sewage treatment equipment according to claim 8 is characterized in that: A water outlet is arranged on one section of the sewage treatment device body, and the water outlet is provided with a water outlet pipe connected with a water pump. Meanwhile, the water pump is also connected with the main pipe, and a valve is arranged on the main pipe.

10. The energy-saving rural domestic sewage resource utilization sewage treatment equipment according to claim 1 is characterized in that: A micro dosing port is provided at the top of one end of the water outlet of the sewage treatment device body for adding chemical agents to adjust and treat water quality.

Images