A oil drilling wastewater treatment system

Abstract

The invention provides an oil drilling wastewater treatment system, which belongs to the technical field of oil drilling. The system comprises a filter, a regulating tank connected to a liquid discharge port of the filter, an anaerobic tank connected to the liquid discharge port of the regulating tank, an aerobic tank connected to the liquid discharge port of the anaerobic tank, a sedimentation tank connected to the liquid discharge port of the aerobic tank, a membrane treatment device connected to the liquid discharge port of the sedimentation tank, and a sludge tank, wherein the liquid discharge port of the sludge tank is connected to a liquid inlet of the regulating tank; a defoaming device is arranged in the aerobic tank, the defoaming device comprises a water spray pipe arranged in the aerobic tank, a nozzle is arranged on the outer sleeve of the water spray pipe; a defoaming blade is rotatably connected to the water spray pipe, and a sawtooth is arranged on the defoaming blade; a suspension net is connected to the water spray pipe and suspended on the water surface, so as to solve the problems of unsatisfactory sewage treatment effect and substandard discharge in the prior art.

Description

Technical Field

[0001] The invention belongs to the technical field of oil drilling, and more specifically, relates to an oil drilling wastewater treatment system. Background Art

[0002] A large amount of wastewater is generated during the oilfield drilling process, including equipment cleaning wastewater, wastewater generated after waste mud condensation and dehydration treatment, etc. At present, the treatment of drilling wastewater is mostly carried out by chemical coagulation, flotation and other methods. These methods can only remove colloidal or suspended large particle pollutants in the water, and there are problems such as incomplete treatment and substandard wastewater after treatment. Summary of the invention

[0003] The purpose of the present invention is to provide a petroleum drilling wastewater treatment system, aiming to solve the problems of unsatisfactory wastewater treatment effect and substandard discharge in the prior art.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a petroleum drilling wastewater treatment system, comprising a filter, a regulating tank connected to the filter discharge port, an anaerobic tank connected to the regulating tank discharge port, an aerobic tank connected to the anaerobic tank discharge port, a sedimentation tank connected to the aerobic tank discharge port, a membrane treatment device connected to the sedimentation tank discharge port, and a sludge tank connected to the sedimentation tank sludge discharge port, wherein the sludge tank discharge port is connected to the liquid inlet of the regulating tank;

[0005] The aerobic pool is provided with a defoaming device, and the defoaming device comprises:

[0006] A water spray pipe is arranged in the aerobic pool, and a nozzle is arranged on the outer cover of the water spray pipe;

[0007] A defoaming blade is rotatably connected to the water spray pipe, and the defoaming blade is provided with saw teeth;

[0008] The suspended net is connected with the water spray pipe and is suspended on the water surface.

[0009] As another embodiment of the present application, a first aeration device and a stirring device are provided in the regulating tank. The first aeration device is provided on a side wall of the regulating tank, and the stirring device is provided on the bottom of the regulating tank.

[0010] As another embodiment of the present application, the stirring device includes a stirring shaft and a stirring paddle, and the blade diameter of the stirring paddle increases from top to bottom.

[0011] As another embodiment of the present application, the aerobic tank includes a first reaction chamber and a second reaction chamber. The first reaction chamber is communicated with the drainage outlet of the anaerobic tank, the second reaction chamber is communicated with the drainage outlet of the first reaction chamber, and the sedimentation tank is communicated with the drainage outlet of the second reaction chamber. The first reaction chamber is used for degrading organic matters in the sewage, and the second reaction chamber is used for degrading ammonia nitrogen in the sewage. Second aeration devices are provided on the bottom plates of both the first reaction chamber and the second reaction chamber, and a chemical dosing device is provided in the upper part of the first reaction chamber.

[0012] As another embodiment of the present application, the chemical dosing device includes:

[0013] A chemical dosing port which is arranged inside the first reaction chamber; and

[0014] A chemical dosing pump which is connected to the chemical dosing port through a chemical dosing pipe.

[0015] As another embodiment of the present application, a water outlet pipe is provided on the second reaction chamber. The water outlet pipe forms the drainage outlet of the second chamber, and a metering pump is provided on the water outlet pipe.

[0016] As another embodiment of the present application, a water distribution device is provided above the first reaction chamber. The water distribution device includes:

[0017] A first water distribution pipe which is annular; and

[0018] A second water distribution pipe which is communicated with the first water distribution pipe and is a cross-shaped pipe. Drainage holes are provided in the lower parts of both the first water distribution pipe and the second water distribution pipe.

[0019] As another embodiment of the present application, high-efficiency biological elastic fillers are provided in the anaerobic tank.

[0020] As another embodiment of the present application, the membrane treatment device is a ceramic membrane filter. The ceramic membrane filter includes:

[0021] The membrane treatment device is a ceramic membrane filter. The ceramic membrane filter includes:

[0022] A tank body. A liquid inlet is provided in the upper part of the tank body, a liquid outlet is provided at the bottom of the tank body, and an opening and closing door is provided on the side wall of the tank body;

[0023] A rotating shaft which is arranged inside the tank body and is connected to a motor;

[0024] A filter element which is arranged around the rotating shaft;

[0025] A first fixing plate which is arranged inside the tank body. A first clamping groove and a liquid inlet hole are provided on the first fixing plate. One end of the filter element is embedded in the first clamping groove, and the outer periphery of the first fixing plate is hermetically fitted with the inner part of the tank body; and

[0026] A second fixing plate is disposed in the tank body and fixed to the rotating shaft. A second slot and a liquid outlet are provided on the second fixing plate. The other end of the filter element is embedded in the second slot. The outer periphery of the second fixing plate is sealed with the tank body.

[0027] As another embodiment of the present application, sealing rings are respectively provided between the filter element and the first slot and between the filter element and the second slot.

[0028] The beneficial effect of the oil drilling wastewater treatment system provided by the present invention is that: compared with the prior art, the oil drilling wastewater treatment system of the present invention first performs grid filtration on the wastewater generated by oil drilling, filters the large particles in the wastewater, and avoids clogging of the pipeline. The wastewater treated by the filter enters the regulating tank, the regulating tank performs homogenization treatment on the wastewater, and then passes into the anaerobic tank to convert the insoluble organic matter in the wastewater into soluble organic matter, and hydrolyzes the macromolecular organic matter into small molecular organic matter, which is beneficial to subsequent treatment. The wastewater after preliminary degradation is sprayed into the aerobic tank through the water distribution device for further oxidation and degradation. The water distribution device can make the wastewater better mixed with the filler in the aerobic tank, which is beneficial to the degradation of microorganisms in the wastewater. Then pass into the sedimentation tank to separate the solid and liquid of the wastewater, the supernatant after separation enters the membrane treatment device for further filtration and can be directly discharged, the precipitated sludge enters the sludge tank for further precipitation and concentration, the concentrated sludge is transported out for composting, and the supernatant is returned to the regulating tank for circulation filtration. After multiple degradation and filtration treatments of sewage through the above-mentioned device, not only can large particles in sewage be filtered, but also organic matter in sewage can be degraded. The membrane treatment device can further filter small molecular particles in sewage, so that the discharged sewage can meet the discharge standards, and the treated sludge can be transported out as fertilizer, realizing pollution-free treatment.

[0029] The aerobic pool is prone to foam increase due to aging sludge and excessive filamentous bacteria. A defoaming device is installed in the aerobic pool. The water spray head on the water spray pipe sprays water into the pool, which impacts the foam and breaks it. At the same time, the defoaming blade rotates along the water pipe under the action of the driving device. The foam blade is provided with saw teeth, which can puncture the foam. A suspended net is set on the water spray pipe to prevent the foam from rising and overflowing. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1A schematic diagram of a process flow of a petroleum drilling wastewater treatment system provided in Embodiment 1 of the present invention;

[0032] Figure 2 A schematic diagram of the structure of a regulating tank provided in Embodiment 1 of the present invention;

[0033] Figure 3 A schematic diagram of the structure of an aerobic pool provided in Embodiment 1 of the present invention;

[0034] Figure 4 for Figure 3 Schematic diagram of the structure of the middle defoaming blade;

[0035] Figure 5 A schematic diagram of the structure of a membrane treatment device provided in an embodiment of the present invention;

[0036] Figure 6 for Figure 5 A partial enlarged view of the middle A part;

[0037] Figure 7 for Figure 5 A partial enlarged view of part B in the middle.

[0038] Figure 8 This is a schematic diagram of the structure of an aerobic pool provided in Example 2 of the present invention.

[0039] Fig. 9 for Figure 8 A schematic diagram of the top view of the water distribution device shown;

[0040] In the figure: 1, filter; 2, regulating tank; 2-1, first aeration device; 2-2, stirring paddle; 2-3, stirring shaft; 2-4, first motor; 3, anaerobic tank; 4, aerobic tank; 4-1, first reaction chamber; 4-2, second reaction chamber; 4-3, filler; 4-4, second aeration device; 4-5, partition; 4-6, metering pump; 4-7, water outlet pipe; 4-8, dosing pump; 4-9, dosing pipe; 4-10, dosing port; 4-11, water distribution device; 4-11-1, first A water distribution pipe; 4-11-2, a second water distribution pipe; 4-12, defoaming blades; 4-13, a water spray pipe; 4-14, a suspended net; 4-15, a nozzle; 5, a sedimentation tank; 6, a membrane treatment device; 6-1, a second motor; 6-2, a tank body; 6-3, a sealing ring; 6-4, a first fixed plate; 6-4-1, a liquid inlet; 6-5, a filter element; 6-6, a second fixed plate; 6-6-1, a liquid outlet; 6-7, a liquid outlet; 6-8, a liquid inlet; 6-9, a rotating shaft; 7, a sludge tank. DETAILED DESCRIPTION

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] Please also read Figure 1 and Figure 3 , the oil drilling wastewater treatment system provided by the present invention is now described. The oil drilling wastewater treatment system comprises a filter 1, a regulating tank 2 connected to the discharge port of the filter 1, an anaerobic tank 3 connected to the discharge port of the regulating tank 2, an aerobic tank 4 connected to the discharge port of the anaerobic tank 3, a sedimentation tank 5 connected to the discharge port of the aerobic tank 4, a membrane treatment device connected to the discharge port of the sedimentation tank 5, and a sludge tank 7 connected to the sludge discharge port of the sedimentation tank, wherein the discharge port of the sludge tank 7 is connected to the liquid inlet of the regulating tank 2;

[0043] The aerobic pool 4 is provided with a defoaming device, which includes a water spray pipe 4-13, a defoaming blade 4-12 and a suspended net 4-14; the water spray pipe 4-13 is provided in the aerobic pool 4, and a nozzle 4-15 is provided on the outer sleeve of the water spray pipe 4-13; the defoaming blade 4-12 is rotatably connected to the water spray pipe 4-13, and the defoaming blade 4-12 is provided with saw teeth; the suspended net 4-14 is connected to the water spray pipe 4-13 and is suspended on the water surface.

[0044] The beneficial effect of the oil drilling wastewater treatment system provided by the present invention is that: compared with the prior art, the oil drilling wastewater treatment system of the present invention first filters the wastewater generated by oil drilling through a filter 1, and filters the large particles in the wastewater to avoid clogging the pipeline. The wastewater treated by the filter 1 enters the regulating tank 2, and the regulating tank 2 performs homogenization treatment on the wastewater, and then passes into the anaerobic tank 3 to convert the insoluble organic matter in the wastewater into soluble organic matter, and hydrolyzes the macromolecular organic matter into small molecular organic matter, which is beneficial to subsequent treatment. The wastewater after preliminary degradation is sprayed into the aerobic tank 4 through the water distribution device 4-11 for further oxidation and degradation. The water distribution device 4-11 can make the wastewater better mixed with the filler in the aerobic tank 4, which is beneficial to the degradation of microorganisms in the wastewater. Then pass into the sedimentation tank 5 to separate the solid and liquid of the wastewater, and the supernatant after separation enters the membrane treatment device for further filtration and can be directly discharged, and the precipitated sludge enters the sludge tank 7 for further precipitation and concentration, and the concentrated sludge is transported out for composting, and the supernatant is returned to the regulating tank 2 for circulation treatment. After the sewage is subjected to multiple degradation and filtration treatments by the above-mentioned device, not only the large particles in the sewage can be filtered, but also the organic matter in the sewage can be degraded. The membrane treatment device 6 can further filter the small molecular particles in the sewage so that the discharged sewage can meet the discharge standards, and the treated sludge can be transported out as fertilizer, realizing pollution-free treatment.

[0045] The aerobic pool 4 is prone to foam increase due to aging of sludge and excessive filamentous bacteria. A defoaming device is set in the aerobic pool 4. The nozzle 4-15 on the water spray pipe 4-13 sprays water into the pool, which impacts the foam and breaks it. At the same time, the defoaming blade 4-12 rotates along the water pipe under the action of the driving device. The defoaming blade 4-12 is provided with saw teeth to pierce the foam. A suspension net 4-14 is set on the water spray pipe 4-13 to prevent the foam from rising and overflowing.

[0046] Preferably, the suspension net 4-14 is slidably connected to the water spray pipe 4-13, and the height of the suspension net 4-14 can be adjusted according to the height of the water surface, or the suspension net 4-14 presses the foam downward to concentrate the foam, and the nozzle 4-15 and the defoaming blade 4-12 are more conducive to eliminating the foam.

[0047] As a specific implementation of the oil drilling wastewater treatment system provided by the present invention, please refer to Figure 2 A first aeration device 2 - 1 and a stirring device are provided in the regulating tank 2 . The first aeration device 2 - 1 is provided on the side wall of the regulating tank 2 , and the stirring device is provided on the bottom of the regulating tank 2 .

[0048] The stirring device is connected to the first motor 2-4. After the sewage enters the regulating tank 2, the first motor 2-4 drives the stirring device to rotate, homogenizes the sewage, and mixes the sewage evenly. The first aeration device 2-1 is arranged on the side wall of the regulating tank 2 to prevent the stirring device from stirring the sewage near the side wall of the regulating tank 2 inadequately. The first aeration device 2-1 cooperates with the stirring device to achieve a better sewage regulation effect.

[0049] As a specific implementation of the embodiment of the present invention, please refer to Figure 2 The stirring device includes a stirring shaft 2-3 and a stirring paddle 2-2, and the blade diameter of the stirring paddle 2-2 increases from top to bottom.

[0050] Under the action of gravity, large particles and impurities in the sewage will sink downward, so the blade diameter of the stirring paddle 2-2 increases from top to bottom, which is more conducive to regulating the mud in the lower part of the regulating tank 2. The stirring paddle 2-2 can be spiral.

[0051] As a specific implementation of the embodiment of the present invention, refer to Figure 3 The aerobic tank 4 includes a first reaction chamber 4-1 and a second reaction chamber 4-2. The first reaction chamber 4-1 is connected to the discharge port of the anaerobic tank 3, the second reaction chamber 4-2 is connected to the discharge port of the first reaction chamber 4-1, and the sedimentation tank 5 is connected to the discharge port of the second reaction chamber 4-2. The first reaction chamber 4-1 is used to degrade organic matter in sewage, and the second reaction chamber 4-2 is used to degrade ammonia nitrogen in sewage. The bottoms of the first reaction chamber 4-1 and the second reaction chamber 4-2 are both provided with a second aeration device 4-4, and the upper part of the first reaction chamber 4-1 is provided with a dosing device.

[0052] A dosing device is provided on the upper part of the first reaction chamber 4-1 to automatically put materials into the first reaction chamber 4-1 to promote the degradation of organic matter therein. A second aeration device 4-4 is provided at the bottom of the first reaction chamber 4-1 to fully mix the sewage with the filler 4-3 and the drug, which is conducive to the degradation and adsorption of organic matter in the sewage.

[0053] As a specific implementation of the embodiment of the present invention, please refer to Figure 3 The dosing device includes a dosing port 4-10, a dosing tube 4-9 and a dosing pump 4-8. The dosing port 4-10 is arranged inside the first reaction chamber 4-1; the dosing pump 4-8 is connected to the dosing port 4-10 through the dosing tube 4-9.

[0054] The material is automatically fed into the first reaction chamber 4-1 by the dosing pump 4-8, and the material is transported to the dosing port 4-10 through the dosing pipe 4-9 by the dosing pump 4-8, thereby entering the first reaction chamber 4-1. A dosing device can be provided on the first reaction chamber 4-1, or on the first reaction chamber 4-1 and the second reaction chamber 4-2, respectively, to improve the efficiency of sewage treatment and realize automatic treatment.

[0055] As a specific implementation of the embodiment of the present invention, please refer to Figure 3 The second reaction chamber 4-2 is provided with a water outlet pipe 4-7, which forms the discharge port of the second reaction chamber 4-2. The water outlet pipe 4-7 is provided with a metering pump 4-6 for adding polyaluminium chloride into the water outlet pipe 4-7.

[0056] Polyaluminium chloride flocculates the precipitate and automatic feeding can be achieved through metering pumps 4-6.

[0057] As a specific implementation of the embodiment of the present invention, please refer to Figure 4 The water distribution device 4-11 includes a first water distribution pipe 4-11-1 and a second water distribution pipe 4-11-2. The first water distribution pipe 4-11-1 is annular. The first water distribution pipe 4-11-1 is connected to the second water distribution pipe 4-11-2. The second water distribution pipe 4-11-2 is a cross-shaped pipe 4-11. The lower parts of the first water distribution pipe 4-11-1 and the second water distribution pipe 4-11-2 are both provided with drainage holes.

[0058] The sewage is sprayed into the first reaction chamber 4-1 through the water distribution device 4-11, so that the sewage is fully mixed with the filler 4-3. The first water distribution pipe 4-11-1 is annular, and the first water distribution pipe 4-11-1 is connected to the second water distribution pipe 4-11-2, and the second water distribution pipe 4-11-2 is a cross-shaped pipe. With this structure, the water pressure in the water distribution device 4-11 is uniform, the area of ​​the sewage sprayed into the first reaction chamber 4-1 is large, and the spraying flow rate is consistent, which can better mix with the filler 4-3 in the first reaction chamber 4-1.

[0059] As a specific implementation of the embodiment of the present invention, please refer to Figure 1 The anaerobic pool 3 is provided with a high-efficiency bioelastic filler 4-3.

[0060] The high-efficiency biological elastic filler 4-3 in the anaerobic pool 3 is used as a carrier of anaerobic bacteria, and the insoluble organic matter in the sewage is converted into soluble organic matter by facultative anaerobic microorganisms, and the macromolecular organic matter is hydrolyzed into small molecular organic matter, so as to facilitate further oxidation and decomposition in the subsequent biological treatment pool. At the same time, the built-in high-efficiency biological elastic filler 4-3 also has the function of hydrolysis and acidification, so as to increase the biochemical retention time and improve the treatment efficiency.

[0061] As a specific implementation of the embodiment of the present invention, please refer to Figures 5 to 7 The membrane treatment device is a ceramic membrane filter, which includes a tank body 6-2, a rotating shaft 6-9, a filter element 5, a first fixed plate 6-4 and a second fixed plate 6-6: a liquid inlet 6-8 is provided on the upper part of the tank body 6-2, a liquid outlet 6-7 is provided on the bottom of the tank body 6-2, and a door that can be opened and closed is provided on the side wall of the tank body 6-2; the rotating shaft 6-9 is arranged in the tank body 6-2 and connected to the second motor 6-1, and the second motor 6-1 drives the rotating shaft 6-9 to rotate in the circumferential direction; the filter element 6-5 is arranged around the rotating shaft 6-9, the first fixed plate 6 -4 is arranged in the tank body 6-2, the first fixed plate 6-4 is provided with a first card slot and a liquid inlet hole 6-4-1, one end of the filter element 6-5 is embedded in the first card slot, and the outer periphery of the first fixed plate 6-4 is sealed with the inner wall of the tank body 6-2; the second fixed plate 6-6 is arranged in the tank body 6-2 and fixed with the rotating shaft 6-9, the second fixed plate 6-6 is provided with a second card slot and a liquid outlet hole 6-6-1, the other end of the filter element 6-5 is embedded in the second card slot, and the outer periphery of the second fixed plate 6-6 is sealed with the inner wall of the tank body 6-2.

[0062] Sewage enters the tank body 6-2 from the liquid inlet 6-8, flows into the filter element 6-5 through the liquid inlet hole 6-4-1 on the first fixed plate 6-4, is filtered by the filter element 6-5, and is discharged through the liquid outlet hole 6-6-1 on the second fixed plate 6-6, and then flows out from the liquid outlet 6-7 at the bottom of the tank body 6-2. The second fixed plate 6-6 is fixed to the rotating shaft 6-9, the lower part of the filter element 6-5 is embedded in the second card slot, and the first card slot on the first fixed plate 6-4 is clamped with the top of the filter element 6-5 to complete the installation. When the filter element 6-5 needs to be replaced or cleaned, start the second motor 6-1, drive the rotating shaft 6-9 to rotate, rotate the filter element 6-5 to the position corresponding to the opening and closing door position, open the door, and remove the filter element 6-5. The device has a simple structure and is easy to disassemble.

[0063] Regularly backwash the filter element 6-5, the backwash frequency is 30-120 minutes, and chemical cleaning is performed once every 0.5-3 months, using a 2% NaOH solution for cleaning. This can reduce the replacement of the filter element 6-5 and save costs.

[0064] As a specific implementation of the embodiment of the present invention, please refer to Figures 5 to 7 A sealing ring 6-3 is provided between the filter element 6-5 and the first slot and between the filter element and the second slot, respectively, to further improve the sealing performance between the filter element 6-5 and the first fixing plate 6-4 and the second fixing plate 6-6, and prevent water leakage.

[0065] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A petroleum drilling wastewater treatment system, It is characterized in that It comprises a filter, a regulating tank connected to the filter discharge port, an anaerobic tank connected to the regulating tank discharge port, an aerobic tank connected to the anaerobic tank discharge port, a sedimentation tank connected to the aerobic tank discharge port, a membrane treatment device connected to the sedimentation tank discharge port, and a sludge tank connected to the sedimentation tank sludge discharge port, wherein the sludge tank discharge port is connected to the liquid inlet of the regulating tank; The aerobic pool is provided with a defoaming device, and the defoaming device comprises: A water spray pipe is arranged in the aerobic pool, and a nozzle is arranged on the outer cover of the water spray pipe; A defoaming blade is rotatably connected to the water spray pipe, and the defoaming blade is provided with saw teeth; A suspension net connected to the water spray pipe and suspended on the water surface; The regulating tank is provided with a first aeration device and a stirring device, wherein the first aeration device is arranged on the side wall of the regulating tank, and the stirring device is arranged on the bottom of the regulating tank; The anaerobic pool is provided with a high-efficiency biological elastic filler.

2. The oil drilling wastewater treatment system according to claim 1, It is characterized in that The stirring device comprises a stirring shaft and a stirring paddle, and the blade diameter of the stirring paddle increases from top to bottom.

3. The oil drilling wastewater treatment system according to claim 1, It is characterized in that The aerobic tank comprises a first reaction chamber and a second reaction chamber, the first reaction chamber is communicated with the discharge port of the anaerobic tank, the second reaction chamber is communicated with the discharge port of the first reaction chamber, the sedimentation tank is communicated with the discharge port of the second reaction chamber, the first reaction chamber is used to degrade organic matter in sewage, and the second reaction chamber is used to degrade ammonia nitrogen in sewage; the bottoms of the first reaction chamber and the second reaction chamber are both provided with a second aeration device, and the upper part of the first reaction chamber is provided with a dosing device.

4. The oil drilling wastewater treatment system according to claim 3, It is characterized in that The drug delivery device comprises: a drug injection port, the drug injection port being arranged inside the first reaction chamber; and The drug dosing pump is connected to the drug dosing port through a drug dosing tube.

5. The oil drilling wastewater treatment system according to claim 3, It is characterized in that The second reaction chamber is provided with a water outlet pipe, the water outlet pipe forms a liquid discharge port of the second chamber, and the water outlet pipe is provided with a metering pump.

6. The oil drilling wastewater treatment system according to claim 3, It is characterized in that The first reaction chamber is provided with a water distribution device, and the water distribution device comprises: a first water distribution pipe, the first water distribution pipe being annular; and The second water distribution pipe is connected with the first water distribution pipe, and the second water distribution pipe is a cross-shaped pipe; the lower parts of the first water distribution pipe and the second water distribution pipe are both provided with drainage holes.

7. The oil drilling wastewater treatment system according to claim 1, It is characterized in that The membrane treatment device is a ceramic membrane filter, and the ceramic membrane filter comprises: A tank body, wherein the upper portion of the tank body is provided with a liquid inlet, the bottom of the tank body is provided with a liquid outlet, and the side wall of the tank body is provided with an opening and closing door; A rotating shaft is disposed in the tank body and connected to the motor; A filter element, arranged around the rotating shaft; The first fixing plate is arranged inside the tank body. The first fixing plate is provided with a first clamping groove and a liquid inlet hole. One end of the filter element is embedded in the first clamping groove, and the outer periphery of the first fixing plate is in sealing cooperation with the inner part of the tank body; and The second fixing plate is arranged inside the tank body and fixedly installed with the rotating shaft. The second fixing plate is provided with a second clamping groove and a liquid outlet hole. The other end of the filter element is embedded in the second clamping groove, and the outer periphery of the second fixing plate is in sealing cooperation with the tank body.

8. The oil drilling sewage treatment system according to claim 7, characterized in that sealing rings are respectively arranged between the filter element and the first clamping groove and between the filter element and the second clamping groove.

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