Resin regeneration wastewater acid-base recovery and utilization system and wastewater treatment method

Abstract

The application discloses a resin regeneration wastewater acid-base recycling system, which comprises a chlorine salt wastewater recycling system and a sodium salt wastewater recycling system, and the chlorine salt wastewater recycling system and the sodium salt wastewater recycling system are connected with a salt solution storage tank through pipelines; a chlorine ion monitor is arranged on the pipeline connected with the salt solution storage tank, and the chlorine ion monitor is arranged close to the salt solution storage tank; and the application further discloses a wastewater treatment method of the resin regeneration wastewater acid-base recycling system. The cation resin chlorine salt wastewater is electrolyzed through an electric adsorption electrolysis device to obtain hydrochloric acid solution and miscellaneous alkali solution which are respectively transported to a hydrochloric acid storage tank and a miscellaneous alkali water tank; meanwhile, the anion resin sodium salt wastewater is electrolyzed through a sodium salt electric adsorption electrolysis device to obtain sodium hydroxide solution and miscellaneous acid solution which are respectively transported to a sodium hydroxide storage tank and a miscellaneous acid water tank; and the miscellaneous acid solution and the miscellaneous alkali solution are mutually neutralized in the pipeline to obtain a salt solution for a desulfurization system. The recycling system avoids the problem of high chlorine content in the desulfurization system.

Description

Technical Field

[0001] This invention belongs to the field of water treatment technology, and relates to a resin regeneration wastewater acid and alkali recovery and utilization system. This invention also relates to a wastewater treatment method for the resin regeneration wastewater acid and alkali recovery and utilization system. Background Technology

[0002] Thermal power plants primarily generate electricity from coal-fired power plants. This involves heating water through coal combustion, and the resulting high-temperature, high-pressure steam expands to drive a turbine, generating electricity. To ensure high heat transfer efficiency of the boiler's heating surfaces and prevent salt buildup and corrosion of metal materials, the quality of the water entering the boiler is critical. Boiler feedwater is mainly demineralized water, prepared through raw water pretreatment and demineralized water production processes. The raw water undergoes pretreatment, reverse osmosis, and ion exchange resin treatment to meet the requirements for boiler feedwater. With increasing environmental protection requirements, wastewater from thermal power plants in the Yangtze and Yellow River basins is required to be upgraded to achieve cascaded utilization and essentially eliminate external discharge.

[0003] Ion exchange resins can effectively remove anions and cations from water and serve as the final treatment stage in the preparation of boiler feedwater. However, once the exchange capacity is reached, the anion and cation exchange resins need to be regenerated using hydrochloric acid and sodium hydroxide solutions, respectively. During the regeneration process, high-salt wastewater is inevitably generated, which produces chloride and sodium salt wastewater, respectively.

[0004] Currently, this wastewater can only be used through the desulfurization system. However, due to the high salt content of this wastewater, it will deteriorate the desulfurization slurry after entering the desulfurization system. In particular, the chloride wastewater generated after the regeneration of the cation exchange resin will cause the chloride ion concentration in the slurry of the desulfurization system to exceed the standard requirement of 20,000 mg / L, which poses a serious threat to the stable operation of the desulfurization system. Summary of the Invention

[0005] The purpose of this invention is to provide an acid and alkali recovery and utilization system for resin regeneration wastewater, which solves the problem of excessive chlorine content in the desulfurization system due to high chloride content in the resin regeneration wastewater in the prior art.

[0006] Another object of the present invention is to provide a wastewater treatment method for a resin regeneration wastewater acid and alkali recovery and utilization system.

[0007] The technical solution adopted in this invention is a resin regeneration wastewater acid and alkali recovery and utilization system, which includes a chloride wastewater recovery system and a sodium wastewater recovery system connected by pipelines. The pipelines connecting the chloride wastewater recovery system and the sodium wastewater recovery system are also connected to a salt solution storage tank. A chloride ion monitor is installed on the pipelines connecting the salt solution storage tank to the chloride wastewater recovery system and the sodium wastewater recovery system.

[0008] The invention is further characterized by:

[0009] The chloride wastewater recovery system includes a cation resin regeneration wastewater tank, which is connected in sequence to a cation wastewater pump and an electro-adsorption electrolysis device via pipelines. The electro-adsorption electrolysis device is connected to a hydrochloric acid storage tank and a miscellaneous alkali water tank via pipelines. The miscellaneous alkali water tank is connected to the sodium wastewater recovery system and the salt solution storage tank via pipelines.

[0010] A valve is installed between the cation resin regeneration wastewater tank and the cation wastewater pump; a check valve is installed on the pipeline connecting the electro-adsorption electrolysis device and the hydrochloric acid storage tank; and a check valve is installed on the pipeline connecting the electro-adsorption electrolysis device and the alkali water tank.

[0011] The electro-adsorption electrolysis device includes a first electrolytic cell, which contains multiple sets of metal anode plates and cathode carbon rods connected in series. The electro-adsorption electrolysis device is also connected to a DC power supply with a voltage of 200V-300V. The distance between each set of metal anode plates and cathode carbon rods is 5cm-12cm, and the voltage between each set of metal anode plates and cathode carbon rods is 1V-5V. The cathode carbon rods are made of activated carbon. The first electrolytic cell is connected to a hydrochloric acid storage tank and a mixed alkali water tank through pipelines.

[0012] The sodium salt wastewater recovery system includes an anion wastewater pump, with an anion resin regeneration wastewater tank connected to one side of the anion wastewater pump and a sodium salt electro-adsorption and electrolysis device connected to the other side. The sodium salt electro-adsorption and electrolysis device is connected to a sodium hydroxide storage tank and a miscellaneous acid water tank through pipelines. The miscellaneous acid water tank is connected to the salt solution storage tank through pipelines.

[0013] The pipeline connecting the anion resin regeneration wastewater tank and the anion wastewater pump is equipped with a valve; the pipeline connecting the sodium salt electroadsorption and electrolysis device and the sodium hydroxide storage tank is equipped with a check valve; and the pipeline connecting the sodium salt electroadsorption and electrolysis device and the miscellaneous acid water tank is equipped with a check valve.

[0014] The sodium salt electro-adsorption electrolysis device includes a second electrolytic cell, which contains multiple sets of metal cathode plates and anode carbon rods connected in series. The sodium salt electro-adsorption electrolysis device is also connected to a DC power supply with a voltage of 200V-300V. The distance between each set of metal cathode plates and anode carbon rods is 5cm-12cm, and the voltage between each set of metal anode plates and cathode carbon rods is 1V-5V. The anode carbon rods are made of activated carbon.

[0015] Another technical solution adopted in this invention is a wastewater treatment method for a resin regeneration wastewater acid-base recovery and utilization system, which is implemented according to the following steps:

[0016] Step 1: The cation resin chloride wastewater in the cation resin regeneration wastewater tank is pumped to the electro-adsorption electrolysis device for electrolysis to obtain hydrochloric acid solution and miscellaneous alkali solution. The anion resin sodium wastewater in the anion resin regeneration wastewater tank is pumped to the sodium salt electro-adsorption electrolysis device for electrolysis to obtain sodium hydroxide solution and miscellaneous acid solution.

[0017] Step 2: The hydrochloric acid solution and the alkali solution obtained in Step 1 are respectively transported to the hydrochloric acid storage tank and the alkali water tank, and the sodium hydroxide solution and the alkali solution obtained in Step 1 are respectively transported to the sodium hydroxide storage tank and the alkali water tank.

[0018] Step 3: When the acid storage capacity of the mixed acid tank or the alkali storage capacity of the mixed alkali tank reaches 1m-1.5m, the mixed acid solution and the mixed alkali solution are discharged into the pipeline and neutralized with each other to obtain the salt solution for the desulfurization system. The salt solution for the desulfurization system is transported to the salt solution storage tank through the chloride ion monitor.

[0019] The beneficial effects of this invention are as follows: The resin regeneration wastewater acid and alkali recovery and utilization system of this invention prepares acids and alkalis from the resin regeneration wastewater through electroadsorption and electrolysis and then recovers and utilizes them to obtain high-purity hydrochloric acid and sodium hydroxide solutions, respectively. This achieves the purpose of repeated resin regeneration and recycling. On this basis, it effectively reduces the amount of regeneration wastewater and reduces the chloride ion content in the wastewater by more than 50%, avoiding the problem of high chloride content in the desulfurization system caused by the current process. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the acid and alkali recovery and utilization system for resin regeneration wastewater of the present invention.

[0021] In the diagram, 1. Chloride wastewater recovery system, 2. Sodium wastewater recovery system, 3. Chloride ion monitor, 4. Salt solution storage tank;

[0022] 101. Cation resin regeneration wastewater tank; 102. Cation wastewater pump; 103. Electro-adsorption electrolysis device; 104. Hydrochloric acid storage tank; 105. Miscellaneous alkali water tank; 201. Anion resin regeneration wastewater tank; 202. Anion wastewater pump; 203. Sodium salt electro-adsorption electrolysis device; 204. Sodium hydroxide storage tank; 205. Miscellaneous acid water tank;

[0023] 10301. First electrolytic cell, 10302. Metal anode plate, 10303. Cathode carbon rod, 20301. Second electrolytic cell, 20302. Metal cathode plate, 20303. Anode carbon rod. Detailed Implementation

[0024] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0025] The present invention provides a resin regeneration wastewater acid and alkali recovery and utilization system, such as... Figure 1As shown, the system includes a chloride wastewater recovery system 1 and a sodium wastewater recovery system 2. The chloride wastewater recovery system 1 and the sodium wastewater recovery system 2 are connected by pipelines to a salt solution storage tank 4. The chloride wastewater recovery system 1 includes a cation resin regeneration wastewater tank 101, which stores cation resin regeneration wastewater. The cation resin regeneration wastewater is mainly composed of chlorides and contains sodium chloride, calcium chloride, magnesium chloride, ferric chloride, and ammonium chloride. The cation resin regeneration wastewater tank 101 is connected in sequence by pipelines to a cation wastewater pump 102 and an electro-adsorption electrolysis device 103. The electro-adsorption electrolysis device 103 includes... The device includes a first electrolytic cell 10301, which contains multiple sets of metal anode plates 10302 and cathode carbon rods 10303 connected in series. The electro-adsorption electrolysis device 103 is also connected to a DC power supply with a voltage of 200V-300V. The distance between each set of metal anode plates 10302 and cathode carbon rods 10303 is 5cm-12cm, and the voltage between each set of metal anode plates 10302 and cathode carbon rods 10303 is 1V-5V. The cathode carbon rods 10303 adsorb impurity cations Na. + Mg 2+ Ga 2+ Fe 3+ NH4 + Remaining Cl - The cathode carbon rod 10303 is made of pressed activated carbon and is used to adsorb impurity cations. The metal anode plate 10302 electrolyzes to generate O2 and produce H2. + The electroadsorption and electrolysis device 103 is connected to a hydrochloric acid storage tank 104 and a mixed alkali water tank 105 via pipelines. + With Cl -Hydrochloric acid solution is discharged into hydrochloric acid storage tank 104. When the cathode carbon rod 10303 is saturated, the electrodes are reversed to release impure cations, forming an impure alkali solution stored in impure alkali water tank 105. Impure alkali water tank 105 is connected to salt solution storage tank 4 via pipeline. A valve is installed between cation resin regeneration wastewater tank 101 and cation wastewater pump 102. A one-way valve is installed on the pipeline connecting electro-adsorption electrolysis device 103 and hydrochloric acid storage tank 104. A one-way valve is also installed on the pipeline connecting electro-adsorption electrolysis device 103 and impure alkali water tank 105. Sodium salt wastewater recovery system 2 includes anion wastewater pump 202. One side of anion wastewater pump 202 is connected to anion resin regeneration wastewater tank 201, and the other side of anion wastewater pump 202 is connected to sodium salt electro-adsorption electrolysis device. The sodium salt electroadsorption electrolysis device 203 includes a second electrolytic cell 20301. Multiple sets of metal cathode plates 20302 and anode carbon rods 20303 are arranged in series within the second electrolytic cell 20301. The sodium salt electroadsorption electrolysis device 203 is also connected to a DC power supply with a voltage of 200V-300V. The distance between each set of metal cathode plates 20302 and anode carbon rods 20303 is 5cm-12cm, and the voltage between each set of metal cathode plates 20302 and anode carbon rods 20303 is 1V-5V. The anode carbon rods 20303 are made of activated carbon, and the anode carbon rods 20303 adsorb impurity anions Cl. - SO4 2- HCO3 - NO3 - NO2 - Remaining Na + The anode carbon rod 20303 is made of activated carbon and is used to adsorb impurity anions. The metal cathode plate 20302 electrolyzes to produce H2 and generate OH-. - The sodium salt electro-adsorption and electrolysis device 203 is connected to a sodium hydroxide storage tank 204 and a mixed acid water tank 205 via pipelines. The mixed acid water tank 205 is connected to the salt solution storage tank 4 via pipelines. The pipeline connecting the anion resin regeneration wastewater tank 201 and the anion wastewater pump 202 is equipped with a valve. The pipeline connecting the sodium salt electro-adsorption and electrolysis device 203 and the sodium hydroxide storage tank 204 is equipped with a check valve. The pipeline connecting the sodium salt electro-adsorption and electrolysis device 203 and the mixed acid water tank 205 is equipped with a check valve. A chloride ion monitor 3 is installed on the pipeline connecting to the salt solution storage tank 4. The chloride ion monitor 3 is located near the salt solution storage tank 4 and is used to detect the chloride ion content in the salt solution used in the desulfurization system.

[0026] The wastewater treatment method for the resin regeneration wastewater acid-base recovery and utilization system shall be implemented according to the following steps:

[0027] Step 1: The cation resin regeneration wastewater in cation resin regeneration wastewater tank 101 is transported to electro-adsorption electrolysis device 103 for electrolysis through cation wastewater pump 102 to obtain hydrochloric acid solution and miscellaneous alkali solution. At the same time, the anion resin regeneration wastewater in anion resin regeneration wastewater tank 201 is transported to sodium salt electro-adsorption electrolysis device 203 for electrolysis through anion wastewater pump 202 to obtain sodium hydroxide solution and miscellaneous acid solution.

[0028] Step 2: The hydrochloric acid solution and the alkali solution obtained in Step 1 are respectively transported to the hydrochloric acid storage tank 104 and the alkali water tank 105, and the sodium hydroxide solution and the alkali solution obtained in Step 1 are respectively transported to the sodium hydroxide storage tank 204 and the alkali water tank 205.

[0029] Step 3: When the acid storage capacity of the mixed acid tank 205 or the alkali storage capacity of the mixed alkali tank 105 reaches a height of 1m-1.5m, the mixed acid solution and the mixed alkali solution are discharged into the pipeline and neutralized with each other to obtain the desulfurization system salt solution. The desulfurization system salt solution is transported to the salt solution storage tank 4 through the chloride ion monitor 3.

[0030] Example 1

[0031] A resin regeneration wastewater acid and alkali recovery system includes a chloride wastewater recovery system 1 and a sodium wastewater recovery system 2. The chloride wastewater recovery system 1 and the sodium wastewater recovery system 2 are connected to a salt solution storage tank 4 via pipelines. A chloride ion monitor 3 is installed on the pipeline connecting to the salt solution storage tank 4, and the chloride ion monitor 3 is located near the salt solution storage tank 4. The chloride wastewater recovery system 1 includes a cation resin regeneration wastewater tank 101, which is sequentially connected to a cation wastewater pump 102 and an electro-adsorption electrolysis device 103 via pipelines. The electro-adsorption electrolysis device 103 is connected to... The device is connected to a hydrochloric acid storage tank 104 and a mixed alkali water tank 105 via pipelines. The mixed alkali water tank 105 is connected to the salt solution storage tank 4 via pipelines. The electro-adsorption electrolysis device 103 includes a first electrolytic cell 10301, which contains multiple sets of metal anode plates 10302 and cathode carbon rods 10303 connected in series. The electro-adsorption electrolysis device 103 is also connected to a 200V DC power supply. The distance between each set of metal anode plates 10302 and cathode carbon rods 10303 is 5 mm. cm, the voltage between each group of metal anode plates 10302 and cathode carbon rods 10303 is 1V, the cathode carbon rods 10303 are made of activated carbon, the sodium salt wastewater recovery system 2 includes an anion wastewater pump 202, one side of the anion wastewater pump 202 is connected to an anion resin regeneration wastewater tank 201, the other side of the anion wastewater pump 202 is connected to a sodium salt electro-adsorption electrolysis device 203, the sodium salt electro-adsorption electrolysis device 203 is connected to a sodium hydroxide storage tank 204 and a miscellaneous acid water tank 205 through pipelines respectively, the miscellaneous acid water tank 205 is connected to the salt solution storage tank 4 through pipelines, the sodium salt electro-adsorption electrolysis device The device 203 includes a second electrolytic cell 20301, which contains multiple sets of metal cathode plates 20302 and anode carbon rods 20303 connected in series. The sodium salt electro-adsorption electrolysis device 203 is also connected to a 200V DC power supply. The distance between each set of metal cathode plates 20302 and anode carbon rods 20303 is 5cm, and the voltage between each set of metal cathode plates 20302 and anode carbon rods 20303 is 1V. The anode carbon rods 20303 are made of activated carbon.

[0032] Example 2

[0033] A resin regeneration wastewater acid and alkali recovery system includes a chloride wastewater recovery system 1 and a sodium wastewater recovery system 2. The chloride wastewater recovery system 1 and the sodium wastewater recovery system 2 are connected to a salt solution storage tank 4 via pipelines. A chloride ion monitor 3 is installed on the pipeline connecting to the salt solution storage tank 4, and the chloride ion monitor 3 is located near the salt solution storage tank 4. The chloride wastewater recovery system 1 includes a cation resin regeneration wastewater tank 101. The cation resin regeneration wastewater tank 101 is connected in sequence to a cation wastewater pump 102 and an electro-adsorption electrolysis device 103 via pipelines. The electro-adsorption electrolysis device 103 is connected to a hydrochloric acid storage tank 104 and a mixed alkali water tank 105 via pipelines. The mixed alkali water tank 105 is connected to the salt solution storage tank 104. The liquid storage tank 4 is connected via pipelines. The electro-adsorption electrolysis device 103 includes a first electrolytic cell 10301, which contains multiple sets of metal anode plates 10302 and cathode carbon rods 10303 connected in series. The electro-adsorption electrolysis device 103 is also connected to a 250V DC power supply. The distance between each set of metal anode plates 10302 and cathode carbon rods 10303 is 8cm, and the voltage between each set of metal anode plates 10302 and cathode carbon rods 10303 is 3V. The cathode carbon rods 10303 are made of activated carbon and are used to adsorb impurity cations Na. + Mg 2+ Ga 2+ Fe 2+ NH4 + The sodium salt wastewater recovery system 2 includes an anion wastewater pump 202. One side of the anion wastewater pump 202 is connected to an anion resin regeneration wastewater tank 201, and the other side is connected to a sodium salt electro-adsorption electrolysis device 203. The sodium salt electro-adsorption electrolysis device 203 is connected via pipelines to a sodium hydroxide storage tank 204 and a mixed acid water tank 205. The mixed acid water tank 205 is connected to a salt solution storage tank 4 via pipelines. The sodium salt electro-adsorption electrolysis device 203 includes a second electrolytic cell 20301, which contains multiple sets of gold... The device consists of cathode plates 20302 and anode carbon rods 20303, with multiple sets of metal cathode plates 20302 and anode carbon rods 20303 connected in series. The sodium salt electroadsorption and electrolysis device 203 is also connected to a 250V DC power supply. The distance between each set of metal cathode plates 20302 and anode carbon rods 20303 is 8cm, and the voltage between each set is 3V. The anode carbon rods 20303 are made of activated carbon and are used to adsorb impurity anions (Cl). - SO4 2- HCO3 - F - NO3 - NO2 - .

[0034] Example 3

[0035] A resin regeneration wastewater acid and alkali recovery system includes a chloride wastewater recovery system 1 and a sodium wastewater recovery system 2. The chloride wastewater recovery system 1 and the sodium wastewater recovery system 2 are connected to a salt solution storage tank 4 via pipelines. A chloride ion monitor 3 is installed on the pipeline connecting to the salt solution storage tank 4, and the chloride ion monitor 3 is located near the salt solution storage tank 4. The chloride wastewater recovery system 1 includes a cation resin regeneration wastewater tank 101. The cation resin regeneration wastewater tank 101 is sequentially connected to a cation wastewater pump 102 and an electro-adsorption electrolysis device 103 via pipelines. The electro-adsorption electrolysis device 103 is connected to a hydrochloric acid storage tank 104 and a mixed alkali water tank 105 via pipelines. The mixed alkali water tank 105 is connected to the salt solution... The storage tank 4 is connected via pipelines. The electro-adsorption electrolysis device 103 includes a first electrolytic cell 10301, which contains multiple sets of metal anode plates 10302 and cathode carbon rods 10303 connected in series. The electro-adsorption electrolysis device 103 is also connected to a 300V DC power supply. The distance between each set of metal anode plates 10302 and cathode carbon rods 10303 is 12cm, and the voltage between each set of metal anode plates 10302 and cathode carbon rods 10303 is 5V. The cathode carbon rods 10303 are made of activated carbon and are used to adsorb impurity cations Na. + Mg 2+ Ga 2+ Fe 2+ NH4 + The sodium salt wastewater recovery system 2 includes an anion wastewater pump 202. One side of the anion wastewater pump 202 is connected to an anion resin regeneration wastewater tank 201, and the other side is connected to a sodium salt electro-adsorption electrolysis device 203. The sodium salt electro-adsorption electrolysis device 203 is connected via pipelines to a sodium hydroxide storage tank 204 and a mixed acid water tank 205. The mixed acid water tank 205 is connected to a salt solution storage tank 4 via pipelines. The sodium salt electro-adsorption electrolysis device 203 includes a second electrolytic cell 20301, which contains multiple sets of gold... The device consists of cathode plates 20302 and anode carbon rods 20303, with multiple sets of metal cathode plates 20302 and anode carbon rods 20303 connected in series. The sodium salt electroadsorption and electrolysis device 203 is also connected to a 300V DC power supply. The distance between each set of metal cathode plates 20302 and anode carbon rods 20303 is 12cm, and the voltage between each set is 5V. The anode carbon rods 20303 are made of activated carbon and are used to adsorb impurity anions (Cl). - SO4 2- HCO3 - F - NO3 - NO2 -A valve is installed between the cation regeneration wastewater tank 101 and the cation wastewater pump 102. A valve is installed on the connecting pipeline between the anion regeneration wastewater tank 201 and the anion wastewater pump 202. A one-way valve is installed on the connecting pipeline between the electro-adsorption electrolysis device 103 and the hydrochloric acid storage tank 104. A one-way valve is installed on the connecting pipeline between the electro-adsorption electrolysis device 103 and the mixed alkali water tank 105. A one-way valve is installed on the connecting pipeline between the sodium salt electro-adsorption electrolysis device 203 and the sodium hydroxide storage tank 204. A one-way valve is installed on the connecting pipeline between the sodium salt electro-adsorption electrolysis device 203 and the mixed acid water tank 205.

[0036] Example 4

[0037] The wastewater treatment method for the resin regeneration wastewater acid-base recovery and utilization system shall be implemented according to the following steps:

[0038] Step 1: The cation resin chloride wastewater in cation resin regeneration wastewater tank 101 is transported to electro-adsorption electrolysis device 103 for electrolysis through cation wastewater pump 102 to obtain hydrochloric acid solution and miscellaneous alkali solution. At the same time, the anion resin sodium wastewater in anion resin regeneration wastewater tank 201 is transported to sodium salt electro-adsorption electrolysis device 203 for electrolysis through anion wastewater pump 202 to obtain sodium hydroxide solution and miscellaneous acid solution.

[0039] Step 2: The hydrochloric acid solution and the alkali solution obtained in Step 1 are respectively transported to the hydrochloric acid storage tank 104 and the alkali water tank 105, and the sodium hydroxide solution and the alkali solution obtained in Step 1 are respectively transported to the sodium hydroxide storage tank 204 and the alkali water tank 205.

[0040] Step 3: When the acid storage capacity of the mixed acid tank 205 or the alkali storage capacity of the mixed alkali tank 105 reaches a height of 1m, the mixed acid solution and the mixed alkali solution are discharged into the pipeline and neutralized with each other to obtain the desulfurization system salt solution. The desulfurization system salt solution is transported to the salt solution storage tank 4 through the chloride ion monitor 3.

[0041] Example 5

[0042] The wastewater treatment method for the resin regeneration wastewater acid-base recovery and utilization system shall be implemented according to the following steps:

[0043] Step 1: The cation resin chloride wastewater in cation resin regeneration wastewater tank 101 is transported to electro-adsorption electrolysis device 103 for electrolysis through cation wastewater pump 102 to obtain hydrochloric acid solution and miscellaneous alkali solution. At the same time, the anion resin sodium wastewater in anion resin regeneration wastewater tank 201 is transported to sodium salt electro-adsorption electrolysis device 203 for electrolysis through anion wastewater pump 202 to obtain sodium hydroxide solution and miscellaneous acid solution.

[0044] Step 2: The hydrochloric acid solution and the alkali solution obtained in Step 1 are respectively transported to the hydrochloric acid storage tank 104 and the alkali water tank 105, and the sodium hydroxide solution and the alkali solution obtained in Step 1 are respectively transported to the sodium hydroxide storage tank 204 and the alkali water tank 205.

[0045] Step 3: When the acid storage capacity of the mixed acid tank 205 or the alkali storage capacity of the mixed alkali tank 105 reaches a height of 1.5m, the mixed acid solution and the mixed alkali solution are discharged into the pipeline and neutralized with each other to obtain the desulfurization system salt solution. The desulfurization system salt solution is transported to the salt solution storage tank 4 through the chloride ion monitor 3.

Claims

1. A resin regeneration wastewater acid and alkali recovery and utilization system, characterized in that, It includes a chloride wastewater recovery system (1) and a sodium wastewater recovery system (2) connected by pipelines. The pipelines connecting the chloride wastewater recovery system (1) and the sodium wastewater recovery system (2) are also connected to a salt solution storage tank (4). A chloride ion monitor (3) is installed on the pipeline connecting the salt solution storage tank (4) to the chloride wastewater recovery system (1) and the sodium wastewater recovery system (2). The chloride wastewater recovery system (1) includes a cation resin regeneration wastewater tank (101), which is connected in sequence to a cation wastewater pump (102) and an electro-adsorption electrolysis device (103) via pipelines. The electro-adsorption electrolysis device (103) is connected to a hydrochloric acid storage tank (104) and a mixed alkali water tank (105) via pipelines. The mixed alkali water tank (105) is connected to the sodium wastewater recovery system (2) and the salt solution storage tank (4) via pipelines. A valve is provided between the cation resin regeneration wastewater tank (101) and the cation wastewater pump (102), a one-way valve is provided in the pipeline connecting the electro-adsorption electrolysis device (103) and the hydrochloric acid storage tank (104), and a one-way valve is provided in the pipeline connecting the electro-adsorption electrolysis device (103) and the miscellaneous alkali water tank (105). The electro-adsorption electrolysis device (103) includes a first electrolytic cell (10301), in which multiple sets of metal anode plates (10302) and cathode carbon rods (10303) are arranged. The multiple sets of metal anode plates (10302) and cathode carbon rods (10303) are connected in series. The electro-adsorption electrolysis device (103) is also connected to a DC power supply with a voltage of 200V-300V. The distance between each set of metal anode plates (10302) and cathode carbon rods (10303) is 5cm-12cm. The voltage between each set of metal anode plates (10302) and cathode carbon rods (10303) is 1V-5V. The cathode carbon rods (10303) are made of activated carbon. The first electrolytic cell (10301) is connected to a hydrochloric acid storage tank (104) and a mixed alkali water tank (105) through pipelines.

2. The resin regeneration wastewater acid and alkali recovery and utilization system according to claim 1, characterized in that, The sodium salt wastewater recovery system (2) includes an anion wastewater pump (202), one side of which is connected to an anion resin regeneration wastewater tank (201), and the other side of which is connected to a sodium salt electro-adsorption electrolysis device (203). The sodium salt electro-adsorption electrolysis device (203) is connected to a sodium hydroxide storage tank (204) and a miscellaneous acid water tank (205) through pipelines. The miscellaneous acid water tank (205) is connected to a salt solution storage tank (4) through pipelines.

3. The resin regeneration wastewater acid and alkali recovery and utilization system according to claim 2, characterized in that, The anion resin regeneration wastewater tank (201) and the anion wastewater pump (202) are connected by a valve, the sodium salt electro-adsorption electrolysis device (203) and the sodium hydroxide storage tank (204) are connected by a one-way valve, and the sodium salt electro-adsorption electrolysis device (203) and the miscellaneous acid water tank (205) are connected by a one-way valve.

4. The resin regeneration wastewater acid and alkali recovery and utilization system according to claim 3, characterized in that, The sodium salt electro-adsorption electrolysis device (203) includes a second electrolytic cell (20301), in which multiple sets of metal cathode plates (20302) and anode carbon rods (20303) are arranged. The multiple sets of metal cathode plates (20302) and anode carbon rods (20303) are connected in series. The sodium salt electro-adsorption electrolysis device (203) is also connected to a DC power supply with a voltage of 200V-300V. The distance between each set of metal cathode plates (20302) and anode carbon rods (20303) is 5cm-12cm. The voltage between each set of metal cathode plates (20302) and anode carbon rods (20303) is 1V-5V. The anode carbon rods (20303) are made of activated carbon.

5. A wastewater treatment method for a resin regeneration wastewater acid-base recovery and utilization system, characterized in that, This method uses the resin regeneration wastewater acid and alkali recovery and utilization system as described in any one of claims 1-4, and is specifically implemented according to the following steps: Step 1: The cation resin chloride wastewater in the cation resin regeneration wastewater tank (101) is transported to the electro-adsorption electrolysis device (103) for electrolysis through the cation wastewater pump (102) to obtain hydrochloric acid solution and miscellaneous alkali solution. The anion resin sodium wastewater in the anion resin regeneration wastewater tank (201) is transported to the sodium salt electro-adsorption electrolysis device (203) for electrolysis through the anion wastewater pump (202) to obtain sodium hydroxide solution and miscellaneous acid solution. Step 2: The hydrochloric acid solution and the alkali solution obtained in Step 1 are respectively transported to the hydrochloric acid storage tank (104) and the alkali water tank (105), and the sodium hydroxide solution and the alkali solution obtained in Step 1 are respectively transported to the sodium hydroxide storage tank (204) and the alkali water tank (205). Step 3: When the acid storage capacity of the mixed acid tank (205) or the alkali storage capacity of the mixed alkali tank (105) reaches 1m-1.5m, the mixed acid solution and the mixed alkali solution are discharged into the pipeline and neutralized with each other to obtain the desulfurization system salt solution. The desulfurization system salt solution is transported to the salt solution storage tank (4) through the chloride ion monitor (3).

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