A device and method for removing COD from high-concentration brine

Abstract

The present invention provides a device and method for removing COD from highly concentrated brine, comprising a water inlet pipe, an ultrafiltration device, an online detector, a nanofiltration water purification device, a high-strength oxidation treatment device, a centrifuge, a resin adsorption tube, a neutralization tank, and a reciprocating adsorption tower. In the present invention, wastewater is separated and concentrated by an ultrafiltration device, and enters the high-strength oxidation treatment device for deep COD removal. When it is then transmitted to the reciprocating adsorption tower, COD adsorption is achieved in the resin adsorption tube, and the COD content in the water is balanced in the neutralization tank. The adsorption is carried out while being transmitted, thereby reducing the time for subsequent adsorption to reach the standard content, and the generated carbon dioxide is collected by a carbon dioxide filter, and the speed and efficiency of physical adsorption are improved by reciprocating and high-speed spraying of liquid in the reciprocating adsorption tower and adsorption during transmission of the resin adsorption chamber, thereby reducing the time required for adsorption to reach the standard, thereby improving the efficiency of physical treatment, and finally performing desalination treatment by the nanofiltration water purification device.

Description

Technical Field

[0001] The invention relates to the field related to brine production, and in particular to a device and method for removing COD from high-concentration brine. Background Art

[0002] With the rapid development of the chemical industry, environmental pollution caused by various industrial wastewaters has become increasingly serious, and zero discharge of chemical wastewater has become an important research topic that has attracted much attention.

[0003] For example, a Chinese patent application numbered CN201821339785.5 discloses a device for removing COD from high-concentration brine, which solves the problem that the high-salt growth environment in wastewater is unfavorable to the growth of microorganisms, and that the flocculation method, Feton oxidation method, and biological method all have certain limitations. The subsequent oxidation efficiency of high-concentration brine is greatly improved through ultrafiltration membrane concentration, and the oxidation effect of the agent is enhanced, effectively ensuring the quality of the final water production. The process flow is simple and the water quality of the produced water is stable.

[0004] There is also a Chinese patent with application number: CN201822215900.4 that discloses a high-concentration brine COD removal system, which solves the problems of large investment, poor economy and unstable effect of the entire removal system. Through the process of adsorption concentration-buffering-centrifugal stratification-oxidation, the treatment effect is improved, and the regenerated materials in the process can be recycled, which has the advantage of strong economy.

[0005] In the removal process of COD from high-salt wastewater, activated carbon adsorption towers are often used in the current process to adsorb and remove COD because of its advantages of being able to be reused many times, being economical and having good adsorption effects. However, after the wastewater is sprayed into the adsorption tower, it needs to stay for a period of time to fully contact with the adsorbent and wait for complete adsorption before being discharged. This consumes too much time and can easily affect the treatment efficiency of high-salt wastewater. Similarly, in the current COD removal combined process, too much waiting time is required for physical treatment, which delays the treatment efficiency and reduces the treatment timeliness. Summary of the invention

[0006] In order to solve the above technical problems, the object of the present invention is to provide a device and method for removing COD from highly concentrated brine.

[0007] Based on this, the present invention proposes a device and method for removing COD from high-concentration brine, including a water inlet pipe, an ultrafiltration device, an online detector, a nanofiltration water purification device, a high-strength oxidation treatment device, a centrifuge, a resin adsorption tube, a neutralization tank, and a reciprocating adsorption tower;

[0008] The right end of the water inlet pipe is connected to the ultrafiltration device, and one end of the ultrafiltration device is connected to the nanofiltration water purification device;

[0009] An online detector is installed at the connection point between the ultrafiltration device and the nanofiltration water purification device;

[0010] The other end of the ultrafiltration device is connected to the high-strength oxidation treatment device, and the right end of the high-strength oxidation treatment device is respectively connected to the centrifuge and the resin adsorption tube;

[0011] The water outlet of the centrifuge is provided with two groups, one group is connected to the resin adsorption tube, and the other group is connected to the high-strength oxidation treatment equipment;

[0012] The right end of the resin adsorption tube is connected to the neutralization tank, and the right end of the neutralization tank is connected to the reciprocating adsorption tower.

[0013] Optionally, the high-intensity oxidation treatment equipment includes a reaction tank, a reflux pipe, an ultraviolet catalytic reactor, a pipeline mixer, a dosing port, a pH automatic control dosing device, and a carbon dioxide filter. A reflux pipe is provided at the right end of the reaction tank, an ultraviolet catalytic reactor is installed at the top of the reaction tank, the right end of the pipeline mixer is connected to the reaction tank, and a dosing port is provided at its left end, a pH automatic control dosing device is installed at the left end of the pipeline mixer, and the carbon dioxide filter is connected to the reaction tank.

[0014] Optionally, the reciprocating adsorption tower includes an adsorption tower, an adsorption layer, a spray head, a water pump, and a resin adsorption chamber. The adsorption tower is provided with an adsorption layer inside and a spray head is installed on the top. The lower end of the water pump is provided with a resin adsorption chamber, and the resin adsorption chamber is connected to the adsorption tower through a pipeline.

[0015] Optionally, a COD adsorption resin is arranged inside the resin adsorption tube, so that when the liquid flows through the resin adsorption tube, a small amount of COD can be adsorbed by the large-pore COD adsorption resin inside the tube, thereby reducing the COD content in the liquid.

[0016] Optionally, the adsorption layer is provided with a variety of adsorption materials, mainly coconut shell carbon and zeolite stone sieve, which are used in combination to enhance the adsorption capacity and thus increase the adsorption speed.

[0017] Optionally, the spray heads are provided in two groups, distributed on the left and right, one group of spray heads is connected to the neutralization tank, and the other group of spray heads is connected to the resin adsorption chamber through a pipeline, so as to realize the reciprocating spraying of the liquid in the adsorption tower, and improve the adsorption speed of the adsorption layer to COD through high-speed spraying.

[0018] Optionally, one-way valves are provided at the connection points between the reaction tank and the centrifuge and the resin adsorption tube, respectively, for controlling the flow direction of the liquid through real-time monitoring by an online detector.

[0019] Optionally, online detectors are installed on the water output end and the reciprocating adsorption tower of the high-intensity oxidation treatment equipment to monitor the removal of COD in the liquid in real time.

[0020] Optionally, the COD adsorption resins arranged in the resin adsorption tube and the resin adsorption chamber are both macroporous resins with large specific surface area, high adsorption speed and efficiency, and the adsorption resin is desorbed using a specific desorbent, so that the material can be regenerated and recycled, with high utilization rate and energy saving.

[0021] The present invention has the following advantages: The present invention provides a device and method for removing COD from high-concentration brine by improvement, which has the following improvements compared with similar equipment:

[0022] Advantages: The present invention provides a device and method for removing COD from high-concentration brine. The wastewater is separated and concentrated by ultrafiltration equipment, and enters a high-strength oxidation treatment device for deep COD removal. When the wastewater is then transmitted to a reciprocating adsorption tower, COD is adsorbed in a resin adsorption tube, and the COD content in the water is balanced in a neutralization tank, so that adsorption is achieved while transmitting, reducing the time for subsequent adsorption to reach the standard content. The generated carbon dioxide is collected and utilized by a carbon dioxide filter to achieve green treatment. The speed and efficiency of physical adsorption are improved by reciprocating and high-speed spraying of liquid in the reciprocating adsorption tower and adsorption during transmission in the resin adsorption chamber, thereby reducing the time required for adsorption to meet the standard, thereby improving the efficiency of physical treatment in the process, and finally desalination treatment is performed by nanofiltration water purification equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0024] Explanation of the accompanying drawings: water inlet pipe-1, ultrafiltration equipment-2, online detector-3, nanofiltration water purification equipment-4, high-intensity oxidation treatment equipment-5, centrifuge-6, resin adsorption tube-7, neutralization tank-8, reciprocating adsorption tower-9, reaction tank-51, reflux pipe-52, ultraviolet photocatalytic reactor-53, pipeline mixer-54, dosing port-55, PH automatic control dosing equipment-56, carbon dioxide filter-57, adsorption tower-91, adsorption layer-92, spray head-93, water pump-94, resin adsorption chamber-95. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] Please refer to Figure 1The present embodiment provides a device and method for removing COD from high-concentration brine, comprising a water inlet pipe 1, an ultrafiltration device 2, an online detector 3, a nanofiltration water purification device 4, a high-strength oxidation treatment device 5, a centrifuge 6, a resin adsorption tube 7, a neutralization tank 8, and a reciprocating adsorption tower 9; the right end of the water inlet pipe 1 is connected to the ultrafiltration device 2, and one end of the ultrafiltration device 2 is connected to the nanofiltration water purification device 4; an online detector 3 is installed at the connection between the ultrafiltration device 2 and the nanofiltration water purification device 4; the other end of the ultrafiltration device 2 is connected to the high-strength oxidation treatment device 5, and the right end of the high-strength oxidation treatment device 5 is respectively connected to the centrifuge 6 and the resin adsorption tube 7; the water outlet of the centrifuge 6 is provided with two groups, one group is connected to the resin adsorption tube 7, and the other group is connected to the high-strength oxidation treatment device 5; the right end of the resin adsorption tube 7 is connected to the neutralization tank 8, and the right end of the neutralization tank 8 is connected to the reciprocating adsorption tower 9.

[0027] In this embodiment, the high-strength oxidation treatment equipment 5 includes a reaction tank 51, a reflux pipe 52, an ultraviolet catalytic reactor 53, a pipeline mixer 54, a dosing port 55, a pH automatic control dosing device 56, and a carbon dioxide filter 57. The right end of the reaction tank 51 is provided with a reflux pipe 52, the top of the reaction tank 51 is installed with an ultraviolet catalytic reactor 53, the right end of the pipeline mixer 54 is connected to the reaction tank 51, and the left end thereof is provided with a dosing port 55, the left end of the pipeline mixer 54 is installed with a pH automatic control dosing device 56, and the carbon dioxide filter 57 is connected to the reaction tank 51.

[0028] In this embodiment, the reciprocating adsorption tower 9 includes an adsorption tower 91, an adsorption layer 92, a spray head 93, a water pump 94, and a resin adsorption chamber 95. The adsorption layer 92 is arranged inside the adsorption tower 91, and the spray head 93 is installed on the top. The resin adsorption chamber 95 is arranged at the lower end of the water pump 94, and the resin adsorption chamber 95 is connected with the adsorption tower 91 through a pipeline.

[0029] In this embodiment, a COD adsorption resin is arranged inside the resin adsorption tube 7, so that when the liquid flows through the resin adsorption tube 7, a small amount of COD can be adsorbed by the large-pore COD adsorption resin inside the pipe, thereby reducing the COD content in the liquid. A variety of adsorption materials are arranged in the adsorption layer 92, mainly coconut shell carbon and zeolite stone sieve, which are used in combination to enhance the adsorption capacity and thus increase the adsorption speed. Two groups of spray heads 93 are arranged, distributed on the left and right, one group of spray heads 93 is connected to the neutralization tank 8, and the other group of spray heads 93 is connected to the resin adsorption chamber 95 through a pipe, so as to realize the reciprocating injection of the liquid in the reciprocating adsorption tower 9, and improve the adsorption layer by high-speed injection. 92 for the adsorption speed of COD, the connection points between the reaction tank 51 and the centrifuge 6 and the resin adsorption tube 7 are respectively provided with a one-way valve, which is used to control the flow direction of the liquid through real-time monitoring of the online detector 3. The water output end of the high-intensity oxidation treatment equipment 5 and the reciprocating adsorption tower 9 are both equipped with an online detector 3 to monitor the removal of COD in the liquid in real time. The COD adsorption resins arranged in the resin adsorption tube 7 and the resin adsorption chamber 95 are all macroporous resins with large specific surface area, high adsorption speed and efficiency, and the adsorption resin is desorbed by using a specific desorbent, so that the material can be regenerated and recycled, with high utilization rate and energy saving.

[0030] The present invention provides a device and method for removing COD from high-concentration brine through improvement, and its working principle is as follows:

[0031] The high-salt wastewater is input from the water inlet pipe 1 to the ultrafiltration device 2, and the water phase and the organic phase are separated by the ultrafiltration device 2. The water phase is input to the nanofiltration water purification device 4 to remove most of the salt in the water phase;

[0032] The organic phase output from the ultrafiltration device 2 flows to the pipeline mixer 54. At the same time, the PH automatic control dosing device 56 automatically detects the PH value of the liquid, adds drugs to adjust the PH value of the liquid, and adds hydrogen peroxide for oxidation treatment. The drug solution and the organic phase are fully mixed in the pipeline mixer 54 and enter the reaction tank 51. At the same time, the ultraviolet catalytic reactor 53 is turned on to perform a high-intensity oxidation reaction. Under the action of the water pump inside the reaction tank 51, the liquid is stirred up and down through the reflux pipe 52 to accelerate the reception of ultraviolet light and achieve rapid and uniform oxidation. After oxidation, the organic phase generates water and carbon dioxide. The discharged carbon dioxide enters the carbon dioxide filter 57 to purify the carbon dioxide. The carbon dioxide is recovered and can be used to reduce carbon monoxide, improve the utilization value, reduce the emission of carbon dioxide, and achieve the purpose of green treatment.

[0033] The water produced in the reaction tank 51 is detected by the online detector 3. When the COD treatment contained therein meets the preset value, the valve leading to the resin adsorption tube 7 is opened to allow the water phase to flow to the resin adsorption tube 7. The adsorption resin inside the resin adsorption tube 7 absorbs the COD in the liquid flowing through, reducing the COD content in the liquid, so that the liquid can also adsorb COD during the process of being input to the next device, reducing the COD content in the liquid, thereby reducing the time required for subsequent COD treatment to meet the standard, and then the liquid enters the neutralization tank 8, and the liquid is stirred to evenly distribute the COD in the liquid for subsequent treatment. When the COD treatment contained therein does not meet the preset value, the valve leading to the centrifuge 6 is opened to allow the liquid to enter the centrifuge 6 for separation treatment, and the produced water flows to the resin adsorption tube 7, and the concentrated water flows to the pipeline mixer 54 again for repeated treatment;

[0034] After being homogenized in the neutralization tank 8, the liquid enters the reciprocating adsorption tower 9, and is sprayed from the spray head 93 on one side, and sprayed to the adsorption layer 92 at a high speed. By increasing the speed of the liquid, the adsorption speed of the adsorption layer 92 is increased, and the liquid at the bottom of the adsorption tower 91 is sucked in by the suction of the water pump 94, and is adsorbed multiple times through two groups of resin adsorption chambers 95, so that the liquid can also reduce the COD content when flowing through, shortening the adsorption time, and then sprayed to the adsorption layer 92 again through the spray head 93. Through continuous reciprocating spraying and adsorption during the flow process, the speed required for the physical reaction is shortened, the adsorption efficiency is increased, and the processing efficiency is improved. The online detector 3 installed on the reciprocating adsorption tower 9 can also monitor the removal progress of the liquid in real time;

[0035] The adsorbed liquid flows from the outlet of the adsorption tower 91 to the nanofiltration water purification device 4 for desalination treatment. The produced water in the nanofiltration water purification device 4 can be directly recycled after the salt is removed, and the concentrated water enters the next treatment process.

[0036] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for removing COD from high-concentration brine, the method using a device for removing COD from high-concentration brine, characterized in that: The device comprises: a water inlet pipe (1), an ultrafiltration device (2), an online detector (3), a nanofiltration water purification device (4), a high-strength oxidation treatment device (5), a centrifuge (6), a resin adsorption tube (7), a neutralization tank (8), and a reciprocating adsorption tower (9); the right end of the water inlet pipe (1) is connected to the ultrafiltration device (2), and one end of the ultrafiltration device (2) is connected to the nanofiltration water purification device (4); the online detector (3) is installed at the connection point between the ultrafiltration device (2) and the nanofiltration water purification device (4) ; The other end of the ultrafiltration device (2) is connected to the high-strength oxidation treatment device (5), and the right end of the high-strength oxidation treatment device (5) is respectively connected to the centrifuge (6) and the resin adsorption tube (7); the water outlet of the centrifuge (6) is provided with two groups, one group is connected to the resin adsorption tube (7), and the other group is connected to the high-strength oxidation treatment device (5); the right end of the resin adsorption tube (7) is connected to the neutralization tank (8), and the right end of the neutralization tank (8) is connected to the reciprocating adsorption tower (9); The high-strength oxidation treatment equipment (5) comprises a reaction tank (51), a reflux pipe (52), an ultraviolet catalytic reactor (53), a pipeline mixer (54), a dosing port (55), a pH automatic control dosing device (56), and a carbon dioxide filter (57). The right end of the reaction tank (51) is provided with a reflux pipe (52), the top of the reaction tank (51) is installed with an ultraviolet catalytic reactor (53), the right end of the pipeline mixer (54) is connected to the reaction tank (51), and the left end thereof is provided with a dosing port (55), the left end of the pipeline mixer (54) is installed with a pH automatic control dosing device (56), and the carbon dioxide filter (57) is connected to the reaction tank (51); The reciprocating adsorption tower (9) comprises an adsorption tower (91), an adsorption layer (92), a spray head (93), a water pump (94), and a resin adsorption chamber (95); the adsorption layer (92) is arranged inside the adsorption tower (91), and the spray head (93) is installed at the top of the adsorption tower (91); the resin adsorption chamber (95) is arranged at the lower end of the water pump (94); and the resin adsorption chamber (95) is connected to the adsorption tower (91) through a pipeline; The spray heads (93) are provided in two groups and are distributed on the left and right. One group of spray heads (93) is connected to the neutralization tank (8), and the other group of spray heads (93) is connected to the resin adsorption chamber (95) through a pipeline. One-way valves are provided at the connection points between the reaction tank (51) and the centrifuge (6) and the resin adsorption tube (7); an online detector (3) is installed at the water output end of the high-strength oxidation treatment equipment (5) and the reciprocating adsorption tower (9). The method comprises the following steps: Step S1: high-salt wastewater is fed from the water inlet pipe (1) to the ultrafiltration device (2), the water phase and the organic phase are separated by the ultrafiltration device (2), and the water phase is fed to the nanofiltration water purification device (4) to remove most of the salt in the water phase; Step S2: the organic phase output from the ultrafiltration device (2) flows to the pipeline mixer (54), and at the same time, the pH automatic control dosing device (56) automatically detects the pH value of the liquid, adds drugs to adjust the pH value of the liquid, and adds hydrogen peroxide for oxidation treatment. The chemical solution and the organic phase are fully mixed in the pipeline mixer (54) and enter the reaction tank (51). At the same time, the ultraviolet catalytic reactor (53) is turned on to perform a high-intensity oxidation reaction. Under the action of the water pump inside the reaction tank (51), the liquid is stirred up and down through the reflux pipe (52), accelerating the reception of ultraviolet light and achieving rapid and uniform oxidation. After oxidation, the organic phase generates water and carbon dioxide. The discharged carbon dioxide enters the carbon dioxide filter (57), purifies the carbon dioxide, and recovers the carbon dioxide, which can be used to reduce carbon monoxide, thereby improving the utilization value, reducing the emission of carbon dioxide, and achieving the purpose of green treatment. Step S3: The water produced in the reaction tank (51) is detected by the online detector (3). When the COD treatment contained therein meets the preset value, the valve leading to the resin adsorption tube (7) is opened to allow the water phase to flow to the resin adsorption tube (7). The adsorption resin inside the resin adsorption tube (7) absorbs the COD in the liquid flowing through, thereby reducing the COD content in the liquid. This allows the liquid to adsorb COD during the process of being input into the next device, thereby reducing the COD content in the liquid, thereby reducing the time required for subsequent COD treatment to meet the standard. The liquid then enters the neutralization tank (8) and is stirred to evenly distribute the COD in the liquid, thereby facilitating subsequent treatment. When the COD treatment contained therein does not meet the preset value, the valve leading to the centrifuge (6) is opened to allow the liquid to enter the centrifuge (6) for separation treatment. The produced water flows to the resin adsorption tube (7), and the concentrated water flows to the pipeline mixer (54) again for repeated treatment. Step S4: After the liquid is homogenized in the neutralization tank (8), it enters the reciprocating adsorption tower (9) and is sprayed from a spray head (93) on one side and sprayed toward the adsorption layer (92) at a high speed. By increasing the speed of the liquid, the adsorption speed of the adsorption layer (92) is increased. The liquid at the bottom of the adsorption tower (91) is sucked in by the water pump (94) and is adsorbed multiple times through two groups of resin adsorption chambers (95). The liquid can also reduce the COD content when it flows through, shortening the adsorption time. The liquid is sprayed toward the adsorption layer (92) again through the spray head (93). Through continuous reciprocating spraying and adsorption during the flow, the speed required for the physical reaction is shortened, the adsorption efficiency is increased, and the treatment efficiency is improved. The removal progress of the liquid can be monitored in real time through the online detector (3) installed on the reciprocating adsorption tower (9); Step S5: the adsorbed liquid flows from the outlet of the adsorption tower (91) to the nanofiltration water purification device (4) for desalination treatment. The produced water in the nanofiltration water purification device (4) can be directly recycled after the salt is removed, and the concentrated water enters the next treatment process.

2. The method for removing COD from highly concentrated brine according to claim 1, characterized in that: The resin adsorption tube (7) is provided with COD adsorption resin inside the tube.

3. The method for removing COD from highly concentrated brine according to claim 1, characterized in that: A variety of adsorption materials are arranged in the adsorption layer (92).

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