Wastewater treatment device based on reverse osmosis membrane

Abstract

The utility model discloses a wastewater treatment device based on a reverse osmosis membrane, which relates to the technical field of wastewater treatment and comprises a wastewater treatment tank and a reverse osmosis filter unit, the wastewater treatment box is a hollow box body with a square structure; the reverse osmosis filtering unit comprises a transfer box, a water purifying chamber, a pressurizing chamber, a push plate, a sealing silica gel plate, a one-way valve and reverse osmosis membranes, and one reverse osmosis membrane is embedded in one side, close to the water purifying chamber, of the L-shaped transfer box. The device is provided with the reliable reverse osmosis filter unit, the two reverse osmosis membranes are arranged on the inner corner side of the L-shaped transfer box, the permeation amount of pure water can be increased, the sewage treatment efficiency is further improved, the two pressurizing chambers are arranged, enough pressure difference between the two sides of the membranes is guaranteed, and in addition, the water quality is improved. The flow rate of liquid at the sewage discharge pipe can be regulated and controlled through the electromagnetic valve, so that the retention time of the sewage in the transfer box can be controlled, and the filtration fineness can be controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a wastewater treatment device based on a reverse osmosis membrane. Background Art

[0002] In people's daily life and in the field of industrial manufacturing, wastewater is generated all the time. Pollutants such as heavy metal particles carried in wastewater pose a serious threat to the ecological environment. Therefore, before the wastewater is discharged, it needs to be treated accordingly; reverse osmosis is an emerging and effective wastewater purification technology that uses pressure to separate water from high-concentration solutions through reverse osmosis membranes. When water molecules are subjected to a certain pressure, they can pass through the pores of the semipermeable membrane, while ions and macromolecules in the water cannot pass through. Therefore, reverse osmosis water treatment can effectively filter and separate impurities in water using semipermeable membranes;

[0003] The reverse osmosis membrane wastewater treatment device in the prior art has a limited installation area of ​​the reverse osmosis membrane, and the amount of liquid passing through the reverse osmosis membrane per unit time is small, resulting in a low efficiency of the device in treating wastewater. In addition, since the wastewater and pure water are separated before the reverse osmosis membrane, the existing device lacks control over the wastewater discharge rate, resulting in a short filtration time for the wastewater before the membrane and the inability to be fully filtered. For this reason, we propose a wastewater treatment device based on a reverse osmosis membrane. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a wastewater treatment device based on a reverse osmosis membrane, which has a reliable reverse osmosis filtration unit. Two reverse osmosis membranes are installed on the inner corner side of the L-shaped transfer box, which can increase the amount of pure water passing through, thereby improving the efficiency of sewage treatment, and is equipped with two pressurizing chambers to ensure that there is a sufficient pressure difference on both sides of the reverse osmosis membrane during the reverse osmosis water purification process. In addition, the solenoid valve can be used to control the liquid flow rate at the sewage discharge pipe, thereby controlling the retention time of the sewage in the transfer box to achieve control of the filtration fineness, which can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a wastewater treatment device based on a reverse osmosis membrane, comprising a wastewater treatment tank and a reverse osmosis filtration unit;

[0006] Wastewater treatment box: It is a hollow box with a square structure, and an L-shaped installation box is fixedly connected to the lower left corner inside the wastewater treatment box;

[0007] Reverse osmosis filtration unit: comprises a transfer box, a clean water chamber, a pressurizing chamber, a push plate, a sealing silicone plate, a one-way valve and a reverse osmosis membrane, an L-shaped transfer box is embedded and installed inside the wastewater treatment box, the outer corner of the transfer box is stuck at the inner corner of the installation box, the L-shaped transfer box divides the interior of the wastewater treatment box into a clean water chamber and two pressurizing chambers, the two pressurizing chambers are respectively located on the upper left and lower right sides of the wastewater treatment box, two hydraulic cylinders are embedded and installed inside the installation box, the two hydraulic cylinders are arranged one horizontally and one vertically, and the telescopic ends extend to the interiors of the two pressurizing chambers respectively, each telescopic end of the hydraulic cylinder is fixedly connected to a push plate, a sealing silicone plate is fixedly installed on the end surface of the push plate, the sealing silicone plate is tightly fitted to the inner wall of the pressurizing chamber, a one-way valve is embedded and installed on the upper left and lower right sides of the transfer box, and a reverse osmosis membrane is embedded and installed on the side of the L-shaped transfer box close to the clean water chamber.

[0008] The wastewater treatment box treats the incoming wastewater. The installation box is used for the installation of two hydraulic cylinders. The two hydraulic cylinders push the push plates on the corresponding sides to move in the pressurized chamber. The sealing silicone plates installed on the push plates fit tightly with the inner wall of the pressurized chamber. The sewage introduced into the pressurized chamber is pressurized under the action of the push plates, and the sewage entering the transfer box can be subjected to corresponding pressure, so that pure water can pass through the tiny internal pores of the reverse osmosis membrane into the water purification chamber to achieve filtration treatment of the sewage. Impurities such as metal salts and bacteria that are filtered out remain in the transfer box waiting to be discharged. Two reverse osmosis membranes are installed on the inner corner side of the L-shaped transfer box, which can increase the amount of pure water passing through, thereby improving the efficiency of sewage treatment. It is also equipped with two pressurized chambers to ensure that there is sufficient pressure difference on both sides of the reverse osmosis membrane during the reverse osmosis water purification process.

[0009] Furthermore, the reverse osmosis filtration unit also includes an inlet pipe 1, an inlet pipe 2 and a coarse filter. The upper left side and the lower right side of the wastewater treatment box are respectively fixedly connected with an inlet pipe 1 and an inlet pipe 2. The inlet pipe 1 and the inlet pipe 2 are perpendicular to the outer wall of the wastewater treatment box, and the two are respectively connected to the pressure chambers on both sides, and a coarse filter is installed at the position where the two pipe bodies are connected to the outer wall of the wastewater treatment box. The inlet pipe 1 and the inlet pipe 2 simultaneously pass sewage into the wastewater treatment box to ensure continuous sewage flow, and the coarse filter is used to isolate larger debris in the sewage.

[0010] Furthermore, the reverse osmosis filtration unit also includes a clean water drain pipe and a sewage drain pipe. The clean water drain pipe is fixedly connected to the upper right side of the wastewater treatment box, and the clean water drain pipe is connected to the water purification chamber. The front end of the transfer box extends outward, and a forward-facing sewage drain pipe is fixedly connected at the corner of the front end of the transfer box. The clean water drain pipe is used to discharge the pure water obtained after the wastewater treatment, and the sewage drain pipe is used to discharge the sewage filtered inside the filter transfer box.

[0011] Furthermore, the reverse osmosis filtration unit also includes a solenoid valve and a PLC controller. A solenoid valve is installed at the position where the sewage pipe is connected to the transfer box, and a PLC controller is installed at the lower left corner of the front side of the wastewater treatment box. The input ends of the solenoid valve and the two hydraulic cylinders in the installation box are electrically connected to the output end of the external power supply through the PLC controller. The solenoid valve can control the liquid flow rate at the sewage pipe, thereby controlling the retention time of the sewage in the transfer box to achieve control of the filtration fineness. The PLC controller can control the solenoid valve and the hydraulic cylinder to start and stop according to the input programming to achieve automatic continuous operation of the device.

[0012] Furthermore, it also includes a mounting plate, fixing screws and a sealing strip. The edge of the reverse osmosis membrane is mounted with a square frame, which is inserted from the rear side into the side wall of the L-shaped transfer box at the corner in a plug-in manner. The rear side of the square frame is fixedly connected with a mounting plate, which is clamped on the rear side of the wastewater treatment box, and a circle of sealing strips is installed at the position where the mounting plate and the rear wall of the wastewater treatment box meet. The mounting plate is used to limit the reverse osmosis membrane and the external frame, and the fixing screws are used to fix the mounting plate, and it is easy to disassemble to pull out the reverse osmosis membrane and clean it.

[0013] Furthermore, it also includes a support bracket and fixing bolts. A trapezoidal support bracket is fixedly connected at each of the four corners of the lower end of the wastewater treatment tank. The support bracket is fixedly connected to the wastewater treatment tank via fixing bolts, and a bolt through hole is provided on the lower side of the support bracket. The support bracket is used to support the wastewater treatment tank, and the fixing bolts are used to fix the support bracket to the wastewater treatment tank. Bolt fasteners can be installed on the lower side of the support bracket to fix the support bracket to the external base.

[0014] Compared with the prior art, the beneficial effects of the utility model are: the wastewater treatment device based on reverse osmosis membrane has the following advantages:

[0015] 1. It has a reliable reverse osmosis filtration unit. Two reverse osmosis membranes are installed on the inner corner of the L-shaped transfer box, which can increase the amount of pure water permeation and thus improve the efficiency of sewage treatment. It is also equipped with two pressurized chambers to ensure that there is sufficient pressure difference on both sides of the reverse osmosis membrane during the reverse osmosis water purification process;

[0016] 2. With a reliable internal structure, sewage can be transferred and treated in the transfer box. The filtered polluted wastewater and pure water that passes through the reverse osmosis membrane are discharged outward in different directions. At the sewage discharge pipe, the solenoid valve can be used to control the liquid flow rate at the sewage discharge pipe, thereby controlling the retention time of sewage in the transfer box to achieve control of the filtration fineness;

[0017] 3. The utility model has a reliable reverse osmosis filtration unit. Two reverse osmosis membranes are installed on the inner corner side of the L-shaped transfer box, which can increase the amount of pure water passing through, thereby improving the efficiency of sewage treatment. It is also equipped with two pressurized chambers to ensure that there is sufficient pressure difference on both sides of the reverse osmosis membrane during the reverse osmosis water purification process. In addition, the solenoid valve can be used to control the liquid flow rate at the sewage pipe, thereby controlling the retention time of the sewage in the transfer box to achieve control of the filtration fineness. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the utility model;

[0019] Figure 2 This is an internal cross-sectional view of the utility model;

[0020] Figure 3 It is a schematic diagram of the rear structure of the utility model.

[0021] In the figure: 1 wastewater treatment tank, 2 installation box, 3 reverse osmosis filtration unit, 31 transfer box, 32 water purification chamber, 33 pressurizing chamber, 34 push plate, 35 sealing silicone plate, 36 one-way valve, 37 reverse osmosis membrane, 38 water inlet pipe 1, 39 water inlet pipe 2, 310 coarse filter, 311 clean water discharge pipe, 312 sewage discharge pipe, 313 solenoid valve, 314 PLC controller, 4 installation plate, 5 fixing screws, 6 sealing strips, 7 support brackets, 8 fixing bolts. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-Figure 3 , This embodiment provides a technical solution: a wastewater treatment device based on a reverse osmosis membrane, comprising a wastewater treatment tank 1 and a reverse osmosis filtration unit 3;

[0024] The wastewater treatment box 1 is a hollow box with a square structure, and an L-shaped installation box 2 is fixedly connected to the lower left corner of the wastewater treatment box 1;

[0025] Reverse osmosis filtration unit 3: includes transfer box 31, clean water chamber 32, pressurizing chamber 33, push plate 34, sealing silicone plate 35, one-way valve 36 and reverse osmosis membrane 37. An L-shaped transfer box 31 is embedded in the wastewater treatment box 1. The outer corner of the transfer box 31 is stuck at the inner corner of the installation box 2. The L-shaped transfer box 31 divides the interior of the wastewater treatment box 1 into a clean water chamber 32 and two pressurizing chambers 33. The two pressurizing chambers 33 are respectively located on the upper left and lower right sides of the interior of the wastewater treatment box 1. The installation box 2 Two hydraulic cylinders are embedded and installed inside, and the two hydraulic cylinders are arranged one horizontally and one vertically, and the telescopic ends extend into the interior of the two pressurized chambers 33 respectively. The telescopic end of each hydraulic cylinder is fixedly connected to a push plate 34, and a sealing silicone plate 35 is fixedly installed on the end surface of the push plate 34. The sealing silicone plate 35 fits tightly with the inner wall of the pressurized chamber 33. A one-way valve 36 is embedded and installed on the upper left side and the lower right side of the transfer box 31, and a reverse osmosis membrane 37 is embedded and installed on the side of the L-shaped transfer box 31 close to the water purification chamber 32.

[0026] The wastewater treatment box 1 processes the wastewater introduced, and the installation box 2 is used for the installation of two hydraulic cylinders. The two hydraulic cylinders push the push plates 34 on the corresponding sides to move in the pressurized chamber 33. The sealing silicone plate 35 installed on the push plate 34 fits tightly with the inner wall of the pressurized chamber 33, and the sewage introduced into the pressurized chamber 33 is pressurized under the action of the push plate 34, and the sewage entering the transfer box 31 can be subjected to the corresponding pressure, so that the pure water can pass through the fine pores inside the reverse osmosis membrane 37 into the water purification chamber 32, and the sewage is filtered. The impurities such as metal salts and bacteria that are filtered out remain in the transfer box 31 waiting to be discharged. Two reverse osmosis membranes 37 are installed on the inner corner side of the L-shaped transfer box 31, which can increase the amount of pure water passing through, thereby improving the efficiency of sewage treatment, and is equipped with two pressurized chambers 33 to ensure that there is enough pressure difference on both sides of the reverse osmosis membrane 37 during the reverse osmosis water purification process.

[0027] The reverse osmosis filtration unit 3 also includes an inlet pipe 1 38, an inlet pipe 2 39 and a coarse filter 310. The upper left side and the lower right side of the wastewater treatment box 1 are respectively fixedly connected with an inlet pipe 1 38 and an inlet pipe 2 39. The inlet pipe 1 38 and the inlet pipe 2 39 are perpendicular to the outer wall of the wastewater treatment box 1, and the two are respectively connected to the pressurized chambers 33 on both sides, and the coarse filter 310 is installed at the position where the two pipe bodies are connected to the outer wall of the wastewater treatment box 1. The inlet pipe 1 38 and the inlet pipe 2 39 simultaneously pass sewage into the wastewater treatment box 1 to ensure continuous sewage flow, and the coarse filter 310 is used to isolate larger debris in the sewage.

[0028] The reverse osmosis filtration unit 3 also includes a clean water drain pipe 311 and a sewage drain pipe 312. The clean water drain pipe 311 is fixedly connected to the upper right side of the wastewater treatment box 1. The clean water drain pipe 311 is connected to the clean water chamber 32. The front end of the transfer box 31 extends outward, and a forward-facing sewage drain pipe 312 is fixedly connected at the corner of the front end of the transfer box 31. The clean water drain pipe 311 is used to discharge the pure water obtained after the wastewater treatment, and the sewage drain pipe 312 is used to discharge the sewage filtered inside the filter transfer box 31.

[0029] The reverse osmosis filtration unit 3 also includes a solenoid valve 313 and a PLC controller 314. The solenoid valve 313 is installed at the position where the sewage pipe 312 is connected to the transfer box 31. The PLC controller 314 is installed at the lower left corner of the front side of the wastewater treatment box 1. The solenoid valve 313 and the input ends of the two hydraulic cylinders in the installation box 2 are electrically connected to the output end of the external power supply through the PLC controller 314. The solenoid valve 313 can control the liquid flow rate at the sewage pipe 312, thereby controlling the retention time of the sewage in the transfer box 31 to achieve control of the filtration fineness.

[0030] It also includes a mounting plate 4, fixing screws 5 and a sealing strip 6. The edge of the reverse osmosis membrane 37 is mounted with a square frame, which is inserted from the rear side into the side wall of the L-shaped transfer box 31 at the inner corner in a plug-in manner. The rear side of the square frame is fixedly connected with a mounting plate 4, which is stuck on the rear side of the wastewater treatment box 1, and a circle of sealing strips 6 is installed at the position where the mounting plate 4 connects with the rear wall of the wastewater treatment box 1. The mounting plate 4 is used to limit the reverse osmosis membrane 37 and the external frame, and the fixing screws 5 are used to fix the mounting plate 4 and facilitate disassembly to pull out the reverse osmosis membrane 37 and clean it.

[0031] It also includes a support bracket 7 and a fixing bolt 8. A trapezoidal support bracket 7 is fixedly connected at each of the four corners of the lower end of the wastewater treatment tank 1. The support bracket 7 is fixedly connected to the wastewater treatment tank 1 through the fixing bolt 8, and a bolt through hole is provided on the lower side of the support bracket 7. The support bracket 7 is used to support the wastewater treatment tank 1, and the fixing bolt 8 is used for the fixed connection between the support bracket 7 and the wastewater treatment tank 1. Bolt fasteners can be installed on the lower side of the support bracket 7 to fix the support bracket 7 to the external base.

[0032] The working principle of the wastewater treatment device based on reverse osmosis membrane provided by the utility model is as follows: the device has a reliable reverse osmosis filtration unit 3, and two reverse osmosis membranes 37 are installed on the inner corner side of the L-shaped transfer box 31, which can increase the amount of pure water passing through, thereby improving the efficiency of sewage treatment, and is equipped with two pressurizing chambers 33 to ensure that there is a sufficient pressure difference on both sides of the reverse osmosis membrane 37 during the reverse osmosis water purification process; the device also has a reliable internal structure, sewage can be transferred and treated in the transfer box 31, and the filtered polluted wastewater and the pure water that passes through the reverse osmosis membrane 37 are discharged outward in different directions, and at the sewage discharge pipe 312, the solenoid valve 313 can be used to control the liquid flow rate at the sewage discharge pipe 312, so that the retention time of the sewage in the transfer box 31 can be controlled to achieve control of the filtration fineness. When the device is in operation, sewage enters the wastewater treatment tank 1 through the water inlet pipe 1 38 and the water inlet pipe 2 39 on both sides. The coarse filter 310 is used to isolate larger debris in the sewage. The L-shaped transfer box 31 divides the interior of the wastewater treatment tank 1 into a clean water chamber 32 and two pressurized chambers 33. The two pressurized chambers 33 are respectively located on the upper left side and the lower right side of the wastewater treatment tank 1. The installation box 2 is used to install two hydraulic cylinders. The two hydraulic cylinders push the push plates 34 on the corresponding sides to move in the pressurized chambers 33. The sealing silicone plate 35 installed on the push plate 34 is tightly fitted with the inner wall of the pressurized chamber 33, and the sewage introduced into the pressurized chamber 33 is pressurized under the action of the push plate 34, and the sewage entering the transfer box 31 can be subjected to the corresponding of pressure, so that pure water can pass through the tiny pores inside the reverse osmosis membrane 37 into the water purification chamber 32, thereby filtering the sewage, and the impurities such as metal salts and bacteria filtered out remain in the transfer box 31 waiting to be discharged; the clean water discharge pipe 311 is used to discharge the pure water obtained after the wastewater treatment, and the sewage discharge pipe 312 is used to discharge the sewage filtered inside the filtration transfer box 31. The solenoid valve 313 can be used to control the liquid flow rate at the sewage discharge pipe 312, so as to control the retention time of the sewage in the transfer box 31, so as to achieve control of the filtration fineness. The PLC controller 314 can control the solenoid valve 313 and the hydraulic cylinder to start and stop according to the input programming, so as to realize automatic continuous operation of the device. In addition, the mounting plate 4 is used to limit the reverse osmosis membrane 37 and the external frame, and the fixing screws 5 are used to fix the mounting plate 4, and are convenient for disassembly to pull out the reverse osmosis membrane 37 and clean it; the supporting bracket 7 is used to support the wastewater treatment tank 1, and the fixing bolts 8 are used for the fixed connection between the supporting bracket 7 and the wastewater treatment tank 1. Bolt fasteners can be installed on the lower side of the supporting bracket 7 to fix the supporting bracket 7 to the external base.

[0033] It is worth noting that the PLC controller 314 disclosed in the above embodiment controls the operation of the solenoid valve 313 and the two hydraulic cylinders in the installation box 2 using a method commonly used in the prior art.

[0034] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A wastewater treatment device based on a reverse osmosis membrane, characterized in that: It comprises a wastewater treatment tank (1) and a reverse osmosis filtration unit (3); The wastewater treatment box (1) is a hollow box body with a square structure, and an L-shaped installation box (2) is fixedly connected to the lower left corner inside the wastewater treatment box (1); The reverse osmosis filtration unit (3) comprises a transfer box (31), a water purification chamber (32), a pressurizing chamber (33), a push plate (34), a sealing silicone plate (35), a one-way valve (36) and a reverse osmosis membrane (37). The wastewater treatment box (1) is embedded with an L-shaped transfer box (31). The outer corner of the transfer box (31) is stuck at the inner corner of the installation box (2). The L-shaped transfer box (31) divides the interior of the wastewater treatment box (1) into a water purification chamber (32) and two pressurizing chambers (33). The two pressurizing chambers (33) are respectively located on the upper left side and the lower right side of the interior of the wastewater treatment box (1). Two hydraulic cylinders are embedded and installed inside the installation box (2). The two hydraulic cylinders are arranged one horizontally and one vertically, and their telescopic ends extend into the interior of the two pressurized chambers (33) respectively. The telescopic end of each hydraulic cylinder is fixedly connected to a push plate (34). A sealing silicone plate (35) is fixedly installed on the end surface of the push plate (34). The sealing silicone plate (35) is tightly fitted with the inner wall of the pressurized chamber (33). A one-way valve (36) is embedded and installed on the upper left side and the lower right side of the transfer box (31). A reverse osmosis membrane (37) is embedded and installed on one side of the L-shaped transfer box (31) close to the water purification chamber (32).

2. The wastewater treatment device based on reverse osmosis membrane according to claim 1, characterized in that: The reverse osmosis filtration unit (3) further comprises a water inlet pipe (38), a water inlet pipe (39) and a coarse filter (310); a water inlet pipe (38) and a water inlet pipe (39) are respectively fixedly connected to the upper left side and the lower right side of the wastewater treatment box (1); the water inlet pipe (38) and the water inlet pipe (39) are perpendicular to the outer wall of the wastewater treatment box (1), and are respectively connected to the pressurized chambers (33) on both sides; and a coarse filter (310) is installed at the position where the two pipe bodies are connected to the outer wall of the wastewater treatment box (1).

3. The wastewater treatment device based on reverse osmosis membrane according to claim 1, characterized in that: The reverse osmosis filtration unit (3) further comprises a clean water discharge pipe (311) and a sewage discharge pipe (312); the clean water discharge pipe (311) is fixedly connected to the upper right side of the wastewater treatment box (1); the clean water discharge pipe (311) is connected to the clean water chamber (32); the front end of the transfer box (31) extends outward, and a sewage discharge pipe (312) facing forward is fixedly connected to the corner of the front end of the transfer box (31).

4. The wastewater treatment device based on reverse osmosis membrane according to claim 3, characterized in that: The reverse osmosis filtration unit (3) further comprises a solenoid valve (313) and a PLC controller (314); the solenoid valve (313) is installed at the position where the sewage discharge pipe (312) is connected to the transfer box (31); the PLC controller (314) is installed at the lower left corner of the front side of the wastewater treatment box (1); the input ends of the solenoid valve (313) and the two hydraulic cylinders in the installation box (2) are electrically connected to the output end of the external power supply through the PLC controller (314).

5. The wastewater treatment device based on reverse osmosis membrane according to claim 1, characterized in that: The invention also comprises a mounting plate (4), fixing screws (5) and a sealing strip (6); the edge of the reverse osmosis membrane (37) is mounted with a square frame, the square frame is inserted from the rear side into the side wall formed at the inner corner of the L-shaped transfer box (31) in an insertion manner, the rear side of the square frame is fixedly connected with a mounting plate (4), the mounting plate (4) is clamped on the rear side of the wastewater treatment box (1), and a circle of sealing strip (6) is installed at the position where the mounting plate (4) and the rear wall of the wastewater treatment box (1) meet.

6. The wastewater treatment device based on reverse osmosis membrane according to claim 1, characterized in that: It also comprises a supporting bracket (7) and fixing bolts (8), wherein a supporting bracket (7) of a trapezoidal structure is fixedly connected at each of the four corners of the lower end of the wastewater treatment tank (1), the supporting bracket (7) is fixedly connected to the wastewater treatment tank (1) via the fixing bolts (8), and a bolt through hole is provided on the lower side of the supporting bracket (7).

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