Waste liquid treatment device and waste liquid treatment method

Abstract

The invention discloses a waste liquid treatment device and a waste liquid treatment method. The device comprises a wastewater treatment device body, a water inlet pump, a water inlet pipe, a water outlet pipe and a dissolved air release system, the body comprises a central cylinder and an outer cylinder which are communicated up and down through a communicating pipe; a waste liquid inlet is formed in the side wall of the central cylinder; the water inlet pump and the water inlet pipe are connected with the water inlet, so that waste liquid injected through the water inlet is subjected to rotational flow reaction in the central cylinder; a water outlet is formed in the outer barrel; the other end of the water outlet pipe is communicated with the dissolved air release system; the dissolved gas release system is connected with the central cylinder, so that the waste liquid dissolved with gas is injected into the central cylinder again for a secondary rotational flow air flotation reaction and is subjected to a mixed rotational flow reaction with the injected waste liquid; and the top of the central cylinder is connected with a scum discharge pipe and an exhaust pipe so as to discharge scum and waste gas. Rapid gel breaking separation of the operation waste liquid is achieved, the treatment process is shortened, and the occupied area and the treatment cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of safety and environmental protection, and in particular to a waste liquid treatment device and a waste liquid treatment method. Background Art

[0002] In the process of oil extraction, drilling fluid, fracturing fluid and other working fluids need to be used in large quantities to ensure the normal operation of oil extraction. However, a large amount of waste drilling fluid, waste fracturing fluid and other operating waste fluids will be generated. If they are directly discharged, they will cause great pollution to the surrounding water bodies. Therefore, it is necessary to dispose of the waste fluids in a reasonable and environmentally friendly manner.

[0003] The content of oil, suspended solids and polymers in the operating waste liquid is relatively high. Conventional operating waste liquid treatment technologies mostly use gravity oil removal, flotation oil removal, filtration, etc., and multiple processes are combined for synergistic treatment during use. Among them, the residence time of mixed flocculation and flotation processes is long, the separation effect is not thorough, and the treatment effect is highly correlated with the strength of the dosing. For operating waste liquid with high suspended solid content and high viscosity, the treatment effect is increased by significantly increasing the dosage of the agent and extending the separation residence time, which leads to a significant increase in production costs, and the production contradiction with the efficient reuse of waste liquid is becoming increasingly prominent. Therefore, in order to enhance the treatment efficiency of operating waste liquid, reduce treatment costs, and improve effluent indicators, it is necessary to develop a new type of operating waste liquid flotation separation short-process treatment device and process. Summary of the invention

[0004] In view of the above problems, the present invention is proposed to provide a waste liquid treatment device and a waste liquid treatment method that overcome the above problems or at least partially solve the above problems.

[0005] In a first aspect, an embodiment of the present invention provides a waste liquid treatment device, comprising:

[0006] Wastewater treatment device body, water inlet pump, water inlet pipe, water outlet pipe, dissolved air release system; Among them:

[0007] The main body of the wastewater treatment device is a columnar tank structure, including a central cylinder and an outer cylinder outside the central cylinder, and the central cylinder and the outer cylinder are connected up and down through a connecting pipe;

[0008] A water inlet for waste liquid is provided on the side wall of the central cylinder; the water inlet pump and the water inlet pipe are connected to the water inlet so that the waste liquid injected through the water inlet undergoes a cyclone reaction in the central cylinder;

[0009] The outer cylinder is provided with a water outlet; one end of the water outlet pipe is connected to the water outlet, and the other end is connected to the dissolved gas release system; the dissolved gas release system is connected to the central cylinder, so that the waste liquid discharged from the water outlet and the waste liquid with dissolved gas obtained after being treated by the dissolved gas release system is injected into the central cylinder again for secondary cyclone flotation reaction, and mixed cyclone reaction occurs with the waste liquid injected from the water inlet;

[0010] The top of the central cylinder is connected to a slag discharge pipe and an exhaust pipe, so that the slag and waste gas generated after the waste liquid undergoes mixed cyclone reaction in the central cylinder are discharged through the slag discharge pipe and the exhaust pipe respectively.

[0011] In one embodiment, the device further comprises: a water production tank connected to the water outlet;

[0012] The dissolved air release system comprises: a reflux water pump, an air compressor, a dissolved air tank, an air release pipe and an air release valve;

[0013] One end of the reflux water pump is connected to the water production tank through a reflux pipe, and the other end is connected to the liquid inlet of the dissolved gas tank; the air compressor is connected to the gas inlet of the dissolved gas tank; the outlet of the dissolved gas tank is connected to the air release pipe; the air release pipe penetrates the outer cylinder and is connected to the inner wall of the central cylinder, and is connected to the interior of the central cylinder, so that the dissolved gas water generated in the dissolved gas tank enters the central cylinder;

[0014] The air release pipe is provided with an air release valve.

[0015] In one embodiment, there are multiple air release pipes, which are respectively arranged along the radial direction of the wastewater treatment device body and are respectively connected to the outlet of the dissolved air tank.

[0016] In one embodiment, the device further comprises: flushing the bypass line;

[0017] The flushing bypass pipeline includes: an air-washing bypass pipeline and an air-washing bypass valve, as well as a backwashing drain pipe and a backwashing outlet valve;

[0018] The air wash bypass valve is arranged on the air wash bypass pipeline, one end of the air wash bypass pipeline is connected to the outlet of the air compressor, and the other end is connected to the cylinder air inlet valve arranged on the outer cylinder;

[0019] The backwash outlet valve is arranged on the backwash drain pipe, and the backwash drain pipe passes through the outer wall of the outer cylinder and is connected to the central cylinder.

[0020] In one embodiment, the central cylinder includes from top to bottom: a scum section, a cyclone reaction section, a plug flow reaction section, a filtration section and a water collection section;

[0021] The barrel diameters of the scum section and the cyclone reaction section are the same, and the barrel diameter of the plug flow reaction section is smaller than the barrel diameters of the scum section and the cyclone reaction section;

[0022] The filter section and the water collection section have the same diameter, and the diameters of the filter section and the water collection section are larger than the diameters of the scum section and the cyclone reaction section.

[0023] In one embodiment, the top of the scum section is a conical necking with a necking angle of 45°-60°; the bottom of the cyclone reaction section is a conical necking with a necking angle of 45°-60°.

[0024] In one embodiment, the top of the filter section is an inverted V-shaped structure with a V-shaped angle of 120°-150°. In one embodiment, a multi-layer filter device is provided in the filter section, and the multi-layer filter device comprises filter layers filled with different filter materials; the filter layers of different filter materials have increasing particle sizes from top to bottom, and a porous bottom plate is provided at the bottom of the multi-layer filter device, and the pore size of the porous bottom plate is smaller than the particle size of the filter material.

[0025] In a second aspect, an embodiment of the present invention provides a method for treating waste liquid using the aforementioned waste liquid treatment device, comprising:

[0026] The waste liquid after the addition of the drug is input into the central cylinder of the wastewater treatment device through the water inlet pump and the water inlet pipe, so that the waste liquid after the addition of the drug undergoes a cyclone reaction in the central cylinder;

[0027] The waste liquid containing dissolved gas obtained after being treated by the dissolved gas release system is injected into the central cylinder again to perform a secondary cyclone flotation reaction, and a mixed cyclone reaction occurs with the waste liquid injected from the water inlet;

[0028] The scum and waste gas generated after the waste liquid undergoes mixed cyclone reaction in the central cylinder are discharged through a slag discharge pipe and an exhaust pipe connected to the top of the central cylinder respectively.

[0029] In one embodiment, after the step of treating the waste liquid, the method further includes: a step of backwashing the waste liquid treatment device.

[0030] In one embodiment, the step of backwashing the waste liquid treatment device includes:

[0031] Turn off the water inlet pump and water inlet valve, and turn off the reflux water pump in the dissolved air release system;

[0032] Open the backwash water outlet valve and the air wash bypass valve on the air wash bypass pipeline connected to the air compressor; introduce the compressed air output by the air compressor into the cylinder air inlet valve, so that the liquid in the outer cylinder enters the water collection section of the central cylinder through the connecting pipe, and then backwashes the filter material in the filter section of the central cylinder upward, and discharges the backwashed liquid through the backwash drain pipe.

[0033] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0034] The above-mentioned waste liquid treatment device and waste liquid treatment method provided by the embodiment of the present invention can be used to treat operating waste liquid with high suspended matter, polymer content, high viscosity, and severe emulsification. By utilizing the innovation of the treatment device structure and multiple cyclone reactions, rapid gel breaking and separation of operating waste liquid can be achieved. The operating waste liquid treated by the device can meet the index requirements for the reuse of oilfield operating waste liquid, and shorten and simplify the waste liquid treatment process, reduce the floor space, reduce the treatment cost, and avoid the shortcomings of incomplete treatment, multiple process devices, and lengthy processes of conventional devices.

[0035] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0036] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0038] Figure 1 Schematic diagram of the structure of the waste liquid treatment device in the embodiment of the present invention;

[0039] Figure 2 It is a schematic diagram of each section of the central cylinder and the sections of the outer cylinder in an embodiment of the present invention;

[0040] Figure 3 It is a flow chart of a method for treating waste liquid using a waste liquid treatment device according to an embodiment of the present invention;

[0041] 1. Inlet pump 2. Inlet valve 3. Inlet pipe 4. Central cylinder 5. Filter baffle 6. Filter material 7. Connecting pipe 8. Porous bottom plate 9. Lower head 10. Mud discharge pipe 11. Support leg 12. Manhole 13. Outer cylinder 14. Backwash outlet valve;

[0042] 15. Backwash drain pipe 16. Slag discharge pipe 17. Exhaust pipe 18. Cylinder air inlet valve 19. Water production tank 20. Return valve 21. Return water pump 22. Air wash bypass valve 23. Dissolved air tank inlet valve 24. Air compressor 25. Dissolved air tank;

[0043] 26. Air release valve 27. Air release pipe; 28. Water outlet pipe;

[0044] A. Upper cyclone reaction sectionB. Lower cyclone reaction sectionC. Plug flow reaction sectionD. Filtration sectionE. Water collection sectionF. Water storage section; G. Scum section. DETAILED DESCRIPTION

[0045] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0046] The embodiment of the present invention provides a waste liquid treatment device, referring to the figure, comprising:

[0047] Wastewater treatment device body, water inlet pump 1, water inlet pipe 3, water outlet pipe 28, dissolved air release system; wherein:

[0048] The main body of the wastewater treatment device is a columnar tank structure, including a central cylinder 4 and an outer cylinder 13 outside the central cylinder 4, and the central cylinder 4 and the outer cylinder 13 are connected up and down through a connecting pipe 7;

[0049] A water inlet for waste liquid is provided on the side wall of the central cylinder 4; a water inlet pump 1 and a water inlet pipe 3 are connected to the water inlet so that the waste liquid (added with treatment chemicals) injected through the water inlet undergoes a cyclonic reaction in the central cylinder 4;

[0050] The outer cylinder 13 is provided with a water outlet; one end of the water outlet pipe 28 is connected to the water outlet, and the other end is connected to the dissolved gas release system; the dissolved gas release system is connected to the central cylinder 4, so that the waste liquid discharged from the water outlet and the waste liquid with dissolved gas obtained after being treated by the dissolved gas release system is injected into the central cylinder 4 again for secondary cyclone flotation reaction, and mixed cyclone reaction occurs with the waste liquid injected from the water inlet;

[0051] The top of the central cylinder 4 is connected to a slag discharge pipe 16 and an exhaust pipe 17 so that the slag and waste gas generated after the waste liquid undergoes mixed cyclone reaction in the central cylinder 4 can be discharged through the slag discharge pipe 16 and the exhaust pipe 17 respectively.

[0052] The above-mentioned waste liquid treatment device provided by the embodiment of the present invention can be used to treat operating waste liquid with high suspended matter, high polymer content, high viscosity, and severe emulsification. By utilizing the innovation of the treatment device structure and multiple cyclone reactions, rapid gel breaking and separation of operating waste liquid can be achieved. The operating waste liquid treated by the device can meet the index requirements for the reuse of oilfield operating waste liquid, and shorten and simplify the waste liquid treatment process, reduce the floor space, reduce the treatment cost, and avoid the shortcomings of incomplete treatment, multiple process devices, and lengthy processes of conventional devices.

[0053] In one embodiment, the wastewater treatment device body adopts a vertical cylindrical tank structure, and the central cylinder 4 can also adopt a cylindrical tank structure, and its top is higher than the outer cylinder 13, and a part is located in the inner cavity of the outer cylinder 13. The bottom of the wastewater treatment device body is also provided with legs to fix it on the ground.

[0054] In one embodiment, referring to Figure 1 As shown, the device further comprises: a water production tank 19 connected to the water outlet;

[0055] The dissolved gas release system includes: a reflux water pump 21, an air compressor 24, a dissolved gas tank 25, a gas release pipe 27 and a gas release valve 26;

[0056] One end of the reflux water pump 21 is connected to the water production tank 19 through a reflux pipe, and the other end is connected to the liquid inlet of the dissolved gas tank 25; the air compressor 24 is connected to the gas inlet of the dissolved gas tank 25; the outlet of the dissolved gas tank 25 is connected to the air release pipe 27; the air release pipe 27 penetrates the outer cylinder 13 and is connected to the inner wall of the central cylinder 4, and is connected to the inside of the central cylinder 4, so that the dissolved gas water generated in the dissolved gas tank 25 enters the central cylinder 4;

[0057] The air release pipe 27 is provided with an air release valve 26 .

[0058] Reference Figure 2 As shown, the central cylinder 4 includes from top to bottom: a scum section, a cyclone reaction section (including Figure 2 The upper cyclone reaction section A and the lower cyclone reaction section B), the plug flow reaction section, the filtration section and the water collection section are shown.

[0059] The cyclone reaction section of the central cylinder in the embodiment of the present invention adopts a double cyclone reaction section, which can be further divided into: an upper cyclone reaction section A and a lower cyclone reaction section B. The waste liquid enters the central cylinder 4 for cyclone reaction, and cyclone flocculation is generated in the upper cyclone reaction section A. The centrifugal force field in the cyclone area is strong and the turbulence is high, which increases the probability of instantaneous collision of destabilized colloids and improves the flocculation efficiency. On the other hand, after being processed by the central cylinder 4, the waste liquid will enter the outer cylinder through the connecting pipe 7 between the central cylinder 4 and the outer cylinder 13, and flow out from the water outlet on the outer cylinder 13 to enter the water production tank 19. The outlet of the water production tank 19 is connected to the reflux water pump 21. The waste liquid can be input into the dissolving tank 25 through the reflux water pump 21, and dissolved with the compressed air generated by the air compressor 24 to form dissolved air water containing microbubbles, and then enter the lower cyclone reaction section B of the central cylinder 4 tangentially through the air release valve 26 and the air release pipe 27; after the waste liquid enters the lower cyclone reaction section B of the central cylinder, microbubbles are used to perform a secondary cyclone flotation reaction on the waste liquid, and the waste liquid is broken and destabilized again. After the flocs formed by the secondary cyclone rise, they can be accompanied by a cyclone reaction again in the upper cyclone reaction section A, accelerating the collision between the microbubbles and the colloidal particles in the waste liquid, and adding colloid breaking and destabilization. After multiple cyclone reactions, the removal of flocs, oil and colloids can be accelerated. Compared with conventional flotation methods, the removal effect is greatly improved.

[0060] Reference Figure 2 As shown, the above scum section G and cyclone reaction section ( Figure 2 The diameters of the plug flow reaction section C are the same, and the diameter of the plug flow reaction section C is smaller than that of the scum section G and the cyclone reaction section ( Figure 2 The diameter of the cylinder (A and B);

[0061] The diameters of the filter section D and the water collection section E are the same, and the diameters of the filter section D and the water collection section E are larger than those of the scum section G and the cyclone reaction section ( Figure 2 The cylinder diameters of A and B).

[0062] Furthermore, the top of the scum section is a conical necking with a necking angle of 45°-60° to facilitate the concentration of scum;

[0063] The bottom end of the cyclone reaction section is a conical necking with a necking angle of 45°-60°, so as to form a plug flow reaction section below the cyclone reaction section.

[0064] The lower part of the scum section and the cyclone reaction section is designed as a tapered straight section to form a plug flow reaction section, which prolongs the cyclone reaction time of the central tube and helps to form a plug flow effect and enhance the flocculation effect.

[0065] In one embodiment, there are multiple air release pipes 27 , which can be arranged along the radial direction of the wastewater treatment device body and connected to the outlets of the air dissolving tank 25 respectively.

[0066] For example, the gas release pipe 27 is divided into four parts and connected to the constricted part of the lower cyclone reaction section B respectively, and is flush with the inner wall of the lower cyclone reaction section B.

[0067] The gas release tubes 27 are evenly distributed in the circumferential direction, that is, arranged at intervals of 90°.

[0068] Each air release pipe 27 is equipped with an air release valve 26 to control the flow rate. The microbubbles are highly integrated with the cyclone reaction, and the cyclone reaction occurs in the lower cyclone reaction section B, which can greatly improve the flotation effect, shorten the flotation time, and achieve a secondary flocculation effect.

[0069] Further, refer to Figure 1 As shown, the top of the filter section D is an inverted V-shaped structure with a V-shaped angle of 120°-150°. A multi-layer filter device is arranged in the filter section, and the multi-layer filter device includes filter layers filled with different filter materials; the filter layers of different filter materials have increasing particle sizes from top to bottom, and a porous bottom plate is arranged at the bottom of the multi-layer filter device, and the pore size of the porous bottom plate is smaller than the particle size of the filter material.

[0070] For example, refer to Figure 1 As shown, the upper part of the filter section D filled with filter material reserves backwash expansion space. The filter material can be quartz sand, pebbles and other multi-media filter materials. The filter material has at least three layers. The bottom layer can be pebbles, and the upper two layers can be quartz sand as filter material. The particle size of the filter material increases from top to bottom, which can intercept and remove excess floc impurities in the water.

[0071] Reference Figure 1 As shown, the filter section E may be provided with 8-12 connecting pipes 7 arranged along the central circumference, and the water collection section E is connected with the water storage section F through the connecting pipes 7. The filter section D may also be provided with an external manhole 12, through which the filter material can be replaced and maintained.

[0072] Reference Figure 2 As shown, after the waste liquid is processed by the central cylinder 4, it will enter the outer cylinder 13 through the connecting pipe 7 between the central cylinder 4 and the outer cylinder 13, forming a water storage area F in the outer cylinder. The water storage area F can store the treated clean water and can also be used as a backwash water tank. There is no need to set up a separate backwash water tank, which saves water, saves floor space, and saves costs.

[0073] In order to achieve backwashing of the filter layer, extend the service life of the filter layer, and improve the filtering effect, in the embodiment of the present invention, the waste liquid treatment device is provided with a flushing bypass pipeline;

[0074] Specifically, refer to Figure 1 As shown, the flushing bypass pipeline includes: an air-washing bypass pipeline and an air-washing bypass valve 22, as well as a backwashing drain pipe 15 and a backwashing outlet valve 14;

[0075] The air wash bypass valve 22 is arranged on the air wash bypass pipeline, one end of the air wash bypass pipeline is connected to the outlet of the air compressor 24, and the other end is connected to the cylinder air inlet valve 18 arranged on the outer cylinder 13;

[0076] The backwash outlet valve 14 is disposed on a backwash drain pipe 15 , and the backwash drain pipe 15 passes through the outer wall of the outer cylinder 13 and is connected to the central cylinder 4 .

[0077] The backwashing operation should be carried out after the waste liquid treatment procedure is completed. Therefore, when the filter material in the filtration area needs to be backwashed, the water inlet pump and the water inlet valve should be closed first, the reflux pump and the reflux valve should be closed, the backwash outlet valve should be opened, and the air compressor flushing bypass valve should be opened at the same time. The air compressor inlet valve should be closed, and the compressed air should be introduced into the cylinder air inlet valve. By increasing the air pressure in the cylinder, the backwashing is accelerated. At this time, the water in the water storage area of ​​the cylinder enters the water collection area at the bottom of the tank through the connecting pipe, and then enters the filtration area through the porous bottom plate. The filter material is backwashed from bottom to top, and the backwash water is discharged through the backwash drain pipe. After the backwashing is completed, close the air compressor flushing bypass valve, close the backwash outlet valve, open the water inlet valve and water inlet pump, open the reflux pump and reflux valve, open the air compressor inlet valve, and the device starts to operate normally.

[0078] In one embodiment, the backwash water outlet can be arranged at the straight section connecting the central tube and the filter area to increase the backwash water flow rate and speed up the discharge of sewage.

[0079] The following is combined with Figure 1 and Figure 2 , the waste liquid treatment process of the waste liquid treatment device of the present invention is illustrated by way of example:

[0080] After the operation waste liquid is first added with medicine, it is transported to the water inlet pipe 3 by the raw water pump 1 through the water inlet valve 2, and enters the central cylinder 4 along the tangential direction in the water inlet pipe 3. The operation waste liquid forms a cyclonic flocculation reaction in the cyclonic reaction section A of the central cylinder 4. The large cyclonic reaction zone is near the cylinder wall, and the small cyclonic reaction zone is near the center. When entering the water for cyclonic reaction, the reflux water pressurized by the reflux water pump 21 enters the air dissolving tank 25, and is dissolved with the compressed air generated by the air compressor 24 to form air-dissolving water containing microbubbles, and then enters the cyclonic reaction section B of the lower central cylinder 4 tangentially through the air release valve 26 and the air release pipe 27, and performs a secondary cyclonic reaction on the waste liquid, and then breaks the gel and destabilizes the waste liquid again, so that the flocs in the water are cyclonically adsorbed, gradually forming large-particle agglomerates, and continuously destroying the colloids in the water. The generated flocs continue to move upward to the upper cyclone reaction section A, and the mixed cyclone reaction is carried out again. Through this reaction, the suspended matter in the operating waste liquid is finally converted into large particle agglomerates, namely scum. The scum gathers in the scum section G at the top of the central cylinder 4 and is discharged from the device by the scum discharge pipe 16. The waste gas generated by the reaction of the central cylinder 4 is discharged by the exhaust pipe 17 and treated separately. The operating waste liquid after slag removal and gel breaking enters the filter section D formed by the filter partition 5 from the outlet of the central cylinder 4. The water flow carries the flocs to diffuse around and is filtered by the filter material 6. The filter material is at least 3 layers and is evenly spread on the porous bottom plate 8. The filtered water enters the water collection section E formed by the lower head 9 from the porous bottom plate 8, and the sludge precipitated in the water collection section E is discharged by the sludge discharge pipe 10. The water in the water collection section E enters the water storage section F through the connecting pipe 7. When the water level reaches the outlet, it is discharged to the water production tank 19 by the outlet pipe. A portion of the water from the water production tank 19 flows back to the reflux water pump 21 to perform dissolved air flotation reaction.

[0081] When the filter material 6 needs to be backwashed, the water inlet pump 1 and the water inlet valve 2 should be closed first, the reflux water pump 21 and the reflux valve 20 should be closed, the backwash outlet valve 14 should be opened, and the air wash bypass valve 22 should be opened at the same time. The air compressor 24 should be closed to enter the dissolved air tank valve 23, and the compressed air should be introduced into the cylinder air inlet valve 18. By increasing the air pressure in the cylinder, the backwashing is accelerated. At this time, the water in the water storage section F in the cylinder enters the tank bottom water collection section E through the connecting pipe 7, and then enters the filtration section D through the porous bottom plate 8, and the filter material 6 is backwashed from bottom to top. The backwashing water is discharged through the backwashing drain pipe 15. After the backwashing is completed, the air wash bypass valve 22 is closed, the backwash outlet valve 14 is closed, the water inlet valve 2 and the water inlet pump 1 are opened, the reflux water pump 21 and the reflux valve 20 are opened, and the air compressor of the device The valve 23 of the dissolved air tank is opened, and the waste liquid treatment device begins to operate normally.

[0082] Based on the same inventive concept, an embodiment of the present invention further provides a method for treating waste liquid. Since the principle of the method is similar to the aforementioned waste liquid treatment device, the implementation of the method can refer to the implementation of the aforementioned device, and the repeated parts will not be repeated.

[0083] The embodiment of the present invention provides a method for treating waste liquid using the waste liquid treatment device as described above, referring to Figure 3 As shown, including:

[0084] S31, inputting the waste liquid after the addition of the drug into the central cylinder of the wastewater treatment device through the water inlet pump and the water inlet pipe, so that the waste liquid after the addition of the drug undergoes a cyclone reaction in the central cylinder;

[0085] S32, injecting the waste liquid containing dissolved gas obtained after being treated by the dissolved gas release system into the central cylinder again for secondary cyclone flotation reaction, and performing mixed cyclone reaction with the waste liquid injected from the water inlet;

[0086] S33, the slag and waste gas generated after the waste liquid undergoes mixed cyclone reaction in the central cylinder are discharged through a slag discharge pipe and an exhaust pipe connected to the top of the central cylinder respectively.

[0087] In one embodiment, after the above steps S31-S33 of treating the waste liquid, the above method may further perform a step of backwashing the waste liquid treatment device.

[0088] Specifically, the step of backwashing the waste liquid treatment device can be achieved by the following steps:

[0089] Turn off the water inlet pump and water inlet valve, and turn off the reflux water pump in the dissolved air release system;

[0090] Open the backwash water outlet valve and the air wash bypass valve on the air wash bypass pipeline connected to the air compressor; introduce the compressed air output by the air compressor into the cylinder air inlet valve, so that the liquid in the outer cylinder enters the water collection section of the central cylinder through the connecting pipe, and then backwashes the filter material in the filter section of the central cylinder upward, and discharges the backwashed liquid through the backwash drain pipe.

[0091] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A waste liquid treatment device, characterized in that: include: Wastewater treatment device body, water inlet pump, water inlet pipe, water outlet pipe, dissolved air release system; Among them: The main body of the wastewater treatment device is a columnar tank structure, including a central cylinder and an outer cylinder outside the central cylinder, and the central cylinder and the outer cylinder are connected up and down through a connecting pipe; A water inlet for waste liquid is provided on the side wall of the central cylinder; the water inlet pump and the water inlet pipe are connected to the water inlet so that the waste liquid injected through the water inlet undergoes a cyclone reaction in the central cylinder; The outer cylinder is provided with a water outlet; one end of the water outlet pipe is connected to the water outlet, and the other end is connected to the dissolved gas release system; the dissolved gas release system is connected to the central cylinder, so that the waste liquid discharged from the water outlet and the waste liquid with dissolved gas obtained after being treated by the dissolved gas release system is injected into the central cylinder again for secondary cyclone flotation reaction, and mixed cyclone reaction occurs with the waste liquid injected from the water inlet; The top of the central cylinder is connected to a slag discharge pipe and an exhaust pipe, so that the slag and waste gas generated after the waste liquid undergoes mixed cyclone reaction in the central cylinder are discharged through the slag discharge pipe and the exhaust pipe respectively.

2. The device according to claim 1, characterized in that The device also includes: a water production tank connected to the water outlet; The dissolved air release system comprises: a reflux water pump, an air compressor, a dissolved air tank, an air release pipe and an air release valve; One end of the reflux water pump is connected to the water production tank through a reflux pipe, and the other end is connected to the liquid inlet of the dissolved gas tank; the air compressor is connected to the gas inlet of the dissolved gas tank; the outlet of the dissolved gas tank is connected to the air release pipe; the air release pipe penetrates the outer cylinder and is connected to the inner wall of the central cylinder, and is connected to the interior of the central cylinder, so that the dissolved gas water generated in the dissolved gas tank enters the central cylinder; The air release pipe is provided with an air release valve.

3. The device according to claim 2, characterized in that The number of the air release pipes is multiple, and the multiple air release pipes are respectively arranged along the radial direction of the wastewater treatment device body and are respectively connected to the outlet of the dissolved air tank.

4. The device according to claim 2, characterized in that The device further comprises: flushing a bypass line; The flushing bypass pipeline includes: an air-washing bypass pipeline and an air-washing bypass valve, as well as a backwashing drain pipe and a backwashing outlet valve; The air wash bypass valve is arranged on the air wash bypass pipeline, one end of the air wash bypass pipeline is connected to the outlet of the air compressor, and the other end is connected to the cylinder air inlet valve arranged on the outer cylinder; The backwash outlet valve is arranged on the backwash drain pipe, and the backwash drain pipe passes through the outer wall of the outer cylinder and is connected to the central cylinder.

5. The device according to any one of claims 1 to 4, characterized in that: The central cylinder includes from top to bottom: a scum section, a cyclone reaction section, a plug flow reaction section, a filtration section and a water collection section; The barrel diameters of the scum section and the cyclone reaction section are the same, and the barrel diameter of the plug flow reaction section is smaller than the barrel diameters of the scum section and the cyclone reaction section; The filter section and the water collection section have the same diameter, and the diameters of the filter section and the water collection section are larger than the diameters of the scum section and the cyclone reaction section.

6. The device according to claim 5, characterized in that The top of the scum section is a conical necking with a necking angle of 45°-60°; the bottom of the cyclone reaction section is a conical necking with a necking angle of 45°-60°.

7. The device according to claim 5, characterized in that The top of the filtering section is an inverted V-shaped structure, and the V-shaped angle is 120°-150°.

8. The device according to claim 5, characterized in that A multi-layer filtering device is arranged in the filtering section, and the multi-layer filtering device includes filtering layers filled with different filter materials; the particle sizes of the filtering layers of different filter materials increase from top to bottom, and a porous bottom plate is arranged at the bottom of the multi-layer filtering device, and the pore size of the porous bottom plate is smaller than the particle size of the filter material.

9. A method for treating waste liquid using the waste liquid treatment device according to any one of claims 1 to 8, characterized in that: include: The waste liquid after the addition of the drug is input into the central cylinder of the wastewater treatment device through the water inlet pump and the water inlet pipe, so that the waste liquid after the addition of the drug undergoes a cyclone reaction in the central cylinder; The waste liquid containing dissolved gas obtained after being treated by the dissolved gas release system is injected into the central cylinder again to perform a secondary cyclone flotation reaction, and a mixed cyclone reaction occurs with the waste liquid injected from the water inlet; The scum and waste gas generated after the waste liquid undergoes mixed cyclone reaction in the central cylinder are discharged through a slag discharge pipe and an exhaust pipe connected to the top of the central cylinder respectively.

10. The method according to claim 9, characterized in that After the step of treating the waste liquid, the method further includes: a step of backwashing the waste liquid treatment device.

11. The method according to claim 9, characterized in that The step of backwashing the waste liquid treatment device comprises: Turn off the water inlet pump and water inlet valve, and turn off the reflux water pump in the dissolved air release system; Open the backwash water outlet valve and the air wash bypass valve on the air wash bypass pipeline connected to the air compressor; introduce the compressed air output by the air compressor into the cylinder air inlet valve, so that the liquid in the outer cylinder enters the water collection section of the central cylinder through the connecting pipe, and then backwashes the filter material in the filter section of the central cylinder upward, and discharges the backwashed liquid through the backwash drain pipe.

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