Reverse osmosis concentrated water electrolysis recycling device

Abstract

The utility model discloses a kind of reverse osmosis concentrated water electrolytic recycling devices, comprising: electrolytic unit, be set in base, with base connection, for through electrode electrolysis reverse osmosis concentrated water generation chlorine and hydrogen. Dissolution absorption unit is set on base, with electrolytic unit pipeline connection, through cyclic spray dissolution absorption electrolytic unit produced chlorine. Circulation unit is connected with electrolysis, dissolution absorption unit pipeline respectively, for providing the flushing flow rate of circulation to electrolytic unit, also for cyclic spray dissolution absorption unit. Concentrated brine is electrolyzed by electrolytic unit, obtained hydrogen is discharged or transported to subsequent section and purified, dissolution absorption unit is dissolved by spray mode to chlorine and is prepared to meet concentration requirement's chlorine product, circulation unit provides electrolytic circulation flushing flow rate and cyclic spray to electrolytic unit and dissolution absorption unit respectively, treat reverse osmosis concentrated water in advance, realize wastewater reduction, reduce subsequent process load and shorten processing time.

Description

Technical Field

[0001] This utility model relates to the field of reverse osmosis concentrate electrolysis technology, and in particular to a reverse osmosis concentrate electrolysis recycling device. Background Technology

[0002] Zero-discharge (ZCD) technology has been widely adopted in industries such as mine water, thermal power plants, and coal chemical industry. Large quantities of concentrated brine require salt extraction treatment before ZCD can be implemented. After softening and membrane concentration, the concentrated brine mainly contains sodium chloride and sodium sulfate. The ZCD wastewater treatment process mainly includes three parts: pretreatment, concentration, and terminal solidification. Concentration is the most crucial step; however, all the concentrated brine obtained after concentration needs to be completely solidified at the final stage. Due to the large volume of concentrated brine to be treated, the solidification and salt extraction process suffers from heavy workload and long processing time.

[0003] Therefore, concentrated brine will impose a heavy load on subsequent processes and result in long processing times. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a reverse osmosis concentrate electrolysis recycling device, which consists of an electrolysis unit, a dissolution and absorption unit, and a recycling unit.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] A reverse osmosis concentrate electrolysis recycling device includes:

[0007] An electrolysis unit, located in and connected to the base, is used to generate chlorine and hydrogen gas by electrolyzing reverse osmosis concentrate through electrodes.

[0008] The dissolution and absorption unit is installed on the base and connected to the pipeline of the electrolysis unit. It dissolves and absorbs the chlorine gas generated by the electrolysis unit through circulating spraying.

[0009] The circulation unit, located between the electrolysis unit and the dissolution absorption unit, is connected to the pipelines of both units. It is used to provide a circulating flushing flow rate to the electrolysis unit and also to circulate and spray the dissolution absorption unit.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] Before subsequent processes, concentrated brine is electrolyzed in an electrolysis unit, and the resulting hydrogen is either discharged or transported to a downstream purification stage. The dissolution and absorption unit dissolves and absorbs chlorine gas through spraying to produce chlorine products that meet the concentration requirements. The circulation unit provides electrolysis circulation flushing flow rate and circulation spraying to the electrolysis unit and the dissolution and absorption unit respectively, thereby pre-treating the reverse osmosis concentrate, reducing wastewater volume, reducing the load on subsequent processes, shortening treatment time, and lowering the investment and operating costs of subsequent terminal solidification.

[0012] More preferably, the electrolysis unit includes: a concentrate tank, a DC power supply, an electrolytic cell, and a replenishment pump, all of which are mounted on a base.

[0013] The outlet of the concentrate tank is connected to the inlet pipeline of the makeup pump. The top of the tank is equipped with a first inlet pipe, which is connected to the external pipeline network to introduce reverse osmosis concentrate into the concentrate tank.

[0014] The electrolyzer is located on one side of the concentrate tank. Its inlet is connected to the outlet pipeline of the replenishment pump, and its outlet is connected to the dissolution and absorption unit pipeline. It is used to electrolyze the reverse osmosis concentrate into hydrogen and chlorine through electrodes.

[0015] The DC power supply is electrically connected to the electrolytic cell and is used to provide DC power to the electrolytic cell.

[0016] By adopting the above technical solution, the electrolysis of reverse osmosis concentrate is realized. The hydrogen generated at the cathode of the electrolytic cell is discharged or transported to the subsequent purification section for further purification. The chlorine obtained at the anode is used as raw material for the preparation of chlorine solution in the dissolution and absorption unit, while reducing the operating load of subsequent processes.

[0017] More preferably, the dissolution absorption unit includes:

[0018] The chlorine solution tank is located on one side of the electrolytic cell, which is situated between the chlorine solution tank and the concentrate tank. The inlet of the chlorine solution tank is connected to the anode outlet of the electrolytic cell via a pipeline.

[0019] An external pump is installed on one side of the chlorine solution tank. Its inlet is connected to the lower part of the chlorine solution tank via a pipeline, and its outlet pipeline is connected to the biochemical process pipeline.

[0020] Using the above technical solution, chlorine gas enters the chlorine solution tank from the anode of the electrolytic cell through a pipeline. It is then dissolved and absorbed by the sprayed water at the top of the chlorine solution tank. After multiple cycles, a chlorine solution is obtained. The chlorine solution product is then delivered to the external process via an external pump, reducing the load on subsequent processes.

[0021] More preferably, the circulation unit includes:

[0022] The first circulating pump is located on one side of the electrolyzer, with its inlet pipeline connected to the bottom outlet of the electrolyzer and its first outlet pipeline connected to the upper part of the other side of the electrolyzer. It is used to provide a flushing flow rate to the electrolyzer through circulating reverse osmosis concentrate.

[0023] The second circulating pump is located on one side of the chlorine solution tank. Its inlet is connected to the lower part of the chlorine solution tank via a pipeline, and its outlet pipeline is connected to the upper part of one side of the chlorine solution tank. It is used to provide spray solution to the chlorine solution tank through circulating chlorine solution.

[0024] The above technical solution increases the flow rate of reverse osmosis concentrate circulation by using a first circulation pump, thus mitigating electrode organic fouling and polarization reactions in the electrolyzer. A second circulation pump enables circulating spraying, accelerating the chlorine solution to reach the preset residual chlorine value of 3%-5%, thereby improving dissolution and absorption efficiency.

[0025] Further optimization involves connecting the inlet of the second circulation pump and the inlet of the external delivery pump to the lower outlet pipeline of the chlorine solution tank.

[0026] By adopting the above technical solution, the second circulation pump and the external delivery pump are connected to the outlet pipeline of the chlorine solution tank. The second circulation pump is used to circulate and transport the chlorine solution for spraying, and the external delivery pump is used to transport the chlorine solution product.

[0027] Further optimization involves connecting the second outlet pipeline of the first circulating pump in parallel with the first outlet pipeline, and connecting the second outlet pipeline to the residual liquid tank and the high-density reaction zone of the subsequent process section.

[0028] Using the above technical solution, the first circulation pump circulates a certain flow rate of flushing velocity to the electrolyzer through the first outlet pipeline, reducing the rate of organic contamination of the electrodes and polarization reaction in the electrolyzer. The second outlet pipeline, as a branch line, transports the high-pH residual liquid to the residual liquid tank or the high-density reaction zone.

[0029] A further optimization involves providing a hydrogen discharge pipe on the upper part of the side wall of the electrolytic cell, which is connected to the inside of the electrolytic cell to discharge the hydrogen gas generated by the cathode inside the electrolytic cell.

[0030] By adopting the above technical solution, hydrogen can be discharged externally or transported to subsequent purification stages for further purification treatment.

[0031] Further optimization involves connecting the outlet of the external pump to a chlorine external delivery pipe, which is used to transport the product chlorine solution to the biochemical process.

[0032] The above technical solution is used to achieve the purpose of conveying chlorine solution products with a residual chlorine value of 3%-5%.

[0033] Further optimization involves a second water inlet pipe fixedly connected to the top of the chlorine solution tank. This second water inlet pipe is connected to the external water network and is used to replenish the chlorine solution tank with pure water.

[0034] The above technical solution is used to replenish the chlorine solution tank with spray water through the second water inlet pipe. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of this embodiment.

[0036] Figure 2 This is a schematic diagram of the rear view structure in this embodiment.

[0037] Figure 3 This is a top view of the structure in this embodiment.

[0038] Figure labels: 1-Concentrate tank; 2-DC power supply; 3-Electrolyzer; 4-Replenishment pump; 5-First circulation pump; 6-External pump; 7-Second circulation pump; 8-Chlorine solution tank; 9-Control box; 10-Base; A-First water inlet pipe; B-Hydrogen discharge pipe; C-Chlorine external delivery pipe; D-Second water inlet pipe. Detailed Implementation

[0039] The following is in conjunction with the appendix Figures 1-3 This utility model will be described in further detail.

[0040] A reverse osmosis concentrate electrolysis recycling device, such as Figure 1 As shown, it includes:

[0041] An electrolysis unit, located in and connected to the base 10, is used to generate chlorine and hydrogen by electrolyzing reverse osmosis concentrate through electrodes.

[0042] The dissolution and absorption unit is installed on the base 10 and connected to the electrolysis unit pipeline. It dissolves and absorbs the chlorine gas generated by the electrolysis unit through circulating spraying.

[0043] The circulation unit, located between the electrolysis unit and the dissolution absorption unit, is connected to the pipelines of both units. It is used to provide a circulating flushing flow rate to the electrolysis unit and also to circulate and spray the dissolution absorption unit.

[0044] Before subsequent processes, concentrated brine is electrolyzed in an electrolysis unit, and the resulting hydrogen is either discharged or transported to a downstream purification stage. The dissolution and absorption unit dissolves and absorbs chlorine gas through spraying to produce chlorine products that meet the concentration requirements. The circulation unit provides electrolysis circulation flushing flow rate and circulation spraying to the electrolysis unit and the dissolution and absorption unit respectively, thereby pre-treating the reverse osmosis concentrate, reducing wastewater volume, reducing the load on subsequent processes, shortening treatment time, and lowering the investment and operating costs of subsequent terminal solidification.

[0045] Specifically, such as Figure 1 , Figure 2 as well as Figure 3 As shown, in this embodiment, the electrolysis unit includes: a concentrate tank 1, a DC power supply 2, an electrolytic cell 3, and a replenishment pump 4. The concentrate tank 1, the DC power supply 2, the electrolytic cell 3, and the replenishment pump 4 are all mounted on the base 10.

[0046] The outlet of the concentrate tank 1 is connected to the inlet pipeline of the make-up pump 4. The top of the tank is equipped with a first inlet pipe A, which is connected to the external pipeline network and is used to introduce reverse osmosis concentrate into the concentrate tank 1.

[0047] Electrolyzer 3 is located on one side of concentrate tank 1. Its inlet is connected to the outlet pipeline of replenishment pump 4, and its outlet is connected to the dissolution and absorption unit pipeline. It is used to electrolyze reverse osmosis concentrate into hydrogen and chlorine through electrodes.

[0048] DC power supply 2 is electrically connected to electrolytic cell 3 and is used to provide DC power supply 2 to electrolytic cell 3.

[0049] The electrolysis of reverse osmosis concentrate is achieved. The hydrogen generated at the cathode of electrolytic cell 3 is discharged or transported to the subsequent purification section for further purification. The chlorine obtained at the anode is used as raw material for the preparation of chlorine solution in the dissolution absorption unit, while reducing the operating load of subsequent processes.

[0050] Specifically, such as Figure 1 , Figure 2 as well as Figure 3 As shown, the dissolution and absorption unit in this embodiment includes:

[0051] The chlorine solution tank 8 is located on one side of the electrolytic cell 3. The electrolytic cell 3 is located between the chlorine solution tank 8 and the concentrate tank 1. The inlet of the chlorine solution tank 8 is connected to the anode outlet of the electrolytic cell 3 through a pipeline.

[0052] An external pump 6 is installed on one side of the chlorine solution tank 8. Its inlet is connected to the lower part of the chlorine solution tank 8 via a pipeline, and its outlet pipeline is connected to the biochemical process pipeline.

[0053] Chlorine gas enters the chlorine solution tank 8 from the anode of the electrolytic cell 3 through a pipeline. It is dissolved and absorbed by the sprayed water at the top of the chlorine solution tank 8. After multiple cycles, a chlorine solution is obtained. The chlorine solution product is then delivered to the external pump 6 to reduce the load on subsequent processes.

[0054] Specifically, such as Figure 1 and Figure 2 As shown, the loop unit in this embodiment includes:

[0055] The first circulating pump 5 is located on one side of the electrolyzer 3. Its inlet pipeline is connected to the bottom outlet of the electrolyzer 3, and its first outlet pipeline is connected to the upper part of the other side of the electrolyzer 3. It is used to provide a flushing flow rate to the electrolyzer 3 through circulating reverse osmosis concentrate.

[0056] The second circulation pump 7 is located on one side of the chlorine solution tank 8. Its inlet is connected to the lower part of the chlorine solution tank 8 via a pipeline, and its outlet is connected to the upper part of one side of the chlorine solution tank 8. It is used to provide spray solution to the chlorine solution tank 8 through circulating chlorine solution. By circulating the solution with the first circulation pump 5, the flow rate of the reverse osmosis concentrate circulation is increased, which slows down the organic fouling and polarization reaction of the electrodes in the electrolyzer 3. The second circulation pump 7 realizes circulating spraying, which accelerates the chlorine solution to reach the preset residual chlorine value of 3%-5%, thereby improving the dissolution and absorption efficiency.

[0057] Specifically, such as Figure 1 and Figure 2 As shown, in this embodiment, the inlet of the second circulation pump 7 and the inlet of the external pump 6 are both connected to the lower outlet pipeline of the chlorine solution tank 8, so that the second circulation pump 7 and the external pump 6 are connected to the outlet pipeline of the chlorine solution tank. The second circulation pump 7 is used to circulate and transport the chlorine solution for spraying, and the external pump 6 is used to transport the chlorine solution product.

[0058] Specifically, such as Figure 1 and Figure 2 As shown, in this embodiment, the second outlet pipeline of the first circulating pump 5 is connected in parallel with the first outlet pipeline. The second outlet pipeline is connected to the residual liquid tank and the high-density reaction zone of the downstream section. The first circulating pump 5 circulates a certain flow rate of flushing velocity to the electrolyzer 3 through the first outlet pipeline to reduce the organic pollution and polarization reaction of the electrodes in the electrolyzer 3. The second outlet pipeline serves as a branch pipeline to transport the high-pH residual liquid to the residual liquid tank or the high-density reaction zone.

[0059] Specifically, such as Figure 1 and Figure 2 As shown, in this embodiment, a hydrogen discharge pipe B is provided on the upper part of the side wall of the electrolytic cell 3. The hydrogen discharge pipe B is connected to the inside of the electrolytic cell 3 and is used to discharge the hydrogen generated by the cathode in the electrolytic cell 3, so as to realize the discharge of hydrogen or transport it to the subsequent purification section for further purification treatment.

[0060] Specifically, such as Figure 1 and Figure 2 As shown, in this embodiment, the outlet of the external pump 6 is connected to a chlorine external delivery pipe C. The chlorine external delivery pipe C is used to transport the product chlorine solution to the biochemical process to achieve the purpose of transporting chlorine solution products with a residual chlorine value of 3%-5%.

[0061] Specifically, such as Figure 1 and Figure 2 As shown, in this embodiment, the top of the chlorine solution tank 8 is fixedly connected to the second water inlet pipe D, which is connected to the external water network. The second water inlet pipe D is used to replenish pure water to the chlorine solution tank 8, thereby achieving the purpose of replenishing the chlorine solution tank 8 with spray water.

[0062] Specifically, this embodiment also includes an automatic control box 9, which is electrically connected to the first circulating pump 5, the second circulating pump 7 and the external pump 6. It is used to automatically control the operation of the first circulating pump 5, the second circulating pump 7 and the external pump 6 to realize the automatic operation of this embodiment. It should be noted that the automatic control box 9 is an existing automatic control device, and a complete PLC frequency converter cabinet can be selected and can be obtained by purchase.

[0063] Please combine Figure 1 , Figure 2 as well as Figure 3 The working principle of this embodiment is described as follows:

[0064] The first inlet pipe A feeds 3% saline reverse osmosis concentrate into the concentrate tank 1. The concentrate is then pumped from the bottom of the concentrate tank 1 by the makeup pump 4 and delivered to the electrolyzer 3. The DC power supply 2 provides power to the electrolyzer 3 to enable it to electrolyze the reverse osmosis concentrate. Chlorine is generated at the anode and hydrogen at the cathode of the electrolyzer 3. The chlorine enters the chlorine solution tank through a pipeline, while the hydrogen is discharged through the hydrogen exhaust pipe B or transported to subsequent processes for further purification to obtain hydrogen that meets the requirements of subsequent processes. The first circulation pump 5 extracts a portion of the reverse osmosis concentrate from the bottom of the electrolyzer 3 as a circulating liquid, which is then delivered to the electrolyzer 3 through the first outlet pipe. This provides a certain flow rate for flushing the electrolyzer 3, mitigating organic contamination and polarization reactions. The second outlet pipe of the first circulation pump 5 delivers high-pH residual liquid to the residual liquid tank or the high-density reaction zone.

[0065] The second inlet pipe D replenishes pure water to the chlorine solution tank 8, mixing it with chlorine gas through spraying to dissolve and absorb the chlorine. Simultaneously, the second circulation pump 7 circulates a portion of the solution from the outlet pipe of the chlorine solution tank 8 back to the solution tank for circulating spraying, thereby enhancing the dissolution and absorption of chlorine gas. After circulating spraying, once the chlorine solution reaches a preset residual chlorine value of 3%-5%, it is then transported to the subsequent disinfection stage of the biochemical process via the external pump 6.

[0066] In summary, reverse osmosis concentrate includes two processes: electrolysis and dissolution absorption. The equipment is streamlined and achieves the goals of collecting reverse osmosis concentrate, electrolysis, dissolution absorption, circulation and transportation, external delivery of chlorine solution products, and external delivery of residual liquid. Wastewater volume is reduced, the load on subsequent processes is reduced, the treatment time is shortened, and the investment and operating costs of subsequent terminal solidification are lowered.

[0067] This specific embodiment is merely an explanation of the utility model and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of protection of this utility model.

Claims

1. A reverse osmosis concentrate electrolysis recycling device, characterized in that, include: An electrolysis unit is disposed in a base (10) and connected to the base (10) for generating chlorine and hydrogen by electrolyzing reverse osmosis concentrate through electrodes; A dissolution and absorption unit is installed on the base (10) and connected to the pipeline of the electrolysis unit. It dissolves and absorbs the chlorine gas generated by the electrolysis unit through circulating spraying. The circulation unit, located between the electrolysis unit and the dissolution and absorption unit, is connected to the pipelines of the electrolysis unit and the dissolution and absorption unit respectively. It is used to provide a circulating flushing flow rate to the electrolysis unit and to circulate and spray the dissolution and absorption unit. The electrolysis unit includes: a concentrate tank (1), a DC power supply (2), an electrolytic cell (3), and a replenishment pump (4). The concentrate tank (1), the DC power supply (2), the electrolytic cell (3), and the replenishment pump (4) are all mounted on the base (10). The outlet of the concentrate tank (1) is connected to the inlet pipeline of the replenishment pump (4), and a first inlet pipe A is provided on its top. The first inlet pipe A is connected to the external pipeline network and is used to introduce reverse osmosis concentrate into the concentrate tank (1). The electrolytic cell (3) is located on one side of the concentrate tank (1), and its inlet is connected to the outlet pipeline of the replenishment pump (4), and its outlet is connected to the pipeline of the dissolution and absorption unit. It is used to electrolyze the reverse osmosis concentrate into hydrogen and chlorine through electrodes. The DC power supply (2) is electrically connected to the electrolytic cell (3) and is used to provide DC power (2) to the electrolytic cell (3); The dissolution and absorption unit includes: A chlorine solution tank (8) is set on one side of the electrolytic cell (3), the electrolytic cell (3) is located between the chlorine solution tank (8) and the concentrate tank (1), and the inlet of the chlorine solution tank (8) is connected to the anode outlet of the electrolytic cell (3) through a pipeline; An external pump (6) is installed on one side of the chlorine solution tank (8), with its inlet connected to the lower part of the chlorine solution tank (8) via a pipeline, and its outlet pipeline connected to the biochemical process pipeline.

2. The reverse osmosis concentrate electrolysis recycling device according to claim 1, characterized in that, The loop unit includes: The first circulating pump (5) is located on one side of the electrolytic cell (3), with its inlet pipeline connected to the bottom outlet of the electrolytic cell (3) and its first outlet pipeline connected to the upper part of the other side of the electrolytic cell (3), for providing a flushing flow rate to the electrolytic cell (3) through circulating reverse osmosis concentrate; The second circulating pump (7) is located on one side of the chlorine solution tank (8). Its inlet is connected to the lower part of the chlorine solution tank (8) via a pipeline, and its outlet pipeline is connected to the upper part of one side of the chlorine solution tank (8). It is used to provide spray solution to the chlorine solution tank (8) through circulating chlorine solution.

3. The reverse osmosis concentrate electrolysis recycling device according to claim 2, characterized in that, The inlet of the second circulation pump (7) and the inlet of the external pump (6) are both connected to the lower outlet pipeline of the chlorine solution tank (8).

4. The reverse osmosis concentrate electrolysis recycling device according to claim 3, characterized in that, The second outlet pipeline of the first circulating pump (5) is connected in parallel with the first outlet pipeline, and the second outlet pipeline is connected to the residual liquid tank and the high-density tank reaction zone of the subsequent section.

5. The reverse osmosis concentrate electrolysis recycling device according to claim 2, characterized in that, The upper part of the side wall of the electrolytic cell (3) is provided with a hydrogen discharge pipe B, which is connected to the inside of the electrolytic cell (3) and is used to discharge the hydrogen gas generated by the cathode in the electrolytic cell (3).

6. The reverse osmosis concentrate electrolysis recycling device according to claim 1, characterized in that, The outlet of the external pump (6) is connected to a chlorine external pipe C, which is used to transport the product chlorine solution to the biochemical process.

7. The reverse osmosis concentrate electrolysis recycling device according to claim 1, characterized in that, The top of the chlorine solution tank (8) is provided with a second water inlet pipe D, which is connected to the external water pipe network. The second water inlet pipe D is used to replenish pure water to the chlorine solution tank (8).

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