306results about "Water softening" patented technology

The invention discloses an electrochemical descaling process ion concentration dynamic balance control method and system, and relates to the field of water treatment of a circulating cooling water system.The method comprises the steps that a multi-parameter sensor is deployed to collect calcium and magnesium ion concentration, pH, conductivity, flow and other multi-dimensional data in real time, and an electrochemical deposition dynamic model is combined; dynamically evaluating the time sequence change trend of the ion concentration; according to the method, an ion concentration dynamic balance control algorithm is constructed, and the current density adjusting quantity is calculated by synthesizing ion concentration deviation and historical integral deviation, so that the target current density of the electrochemical reactor is adaptively adjusted, and the system is always maintained in a target concentration interval under different inlet water quality and load conditions; precise electrolysis control is achieved by periodically adjusting power output, and the descaling efficiency and energy consumption are effectively balanced. Therefore, the self-adaptive adjustment of the electrochemical descaling process is realized, and the stability and the self-adaptability of the descaling process are remarkably improved.

The invention discloses a printing and dyeing wastewater zero-discharge treatment process based on low-pressure high-power membrane concentration and salt separation synergy. The wastewater is sequentially subjected to the steps of double-alkali softening pretreatment, organic pollutant treatment, forward osmosis low-pressure high-power concentration treatment, salt separation treatment and evaporative crystallization. Wherein the forward osmosis low-pressure high-power concentration treatment is performed in a partitioned manner along the flow direction, the osmotic pressure difference is gradually increased, the transmembrane pressure difference is gradually decreased, and interface electrochemical buffer and low-frequency gas-liquid disturbance can be set to inhibit concentration polarization and pollution. Carrying out nanofiltration and salt separation on the concentrated solution to obtain two paths of saline water mainly comprising Na2SO4 and NaCl, and respectively carrying out evaporative crystallization on the two paths of saline water; and refluxing and reusing the water produced by the draw solution. According to the process, high-power concentration and stable salt separation are realized under low mechanical pressure, the energy consumption is reduced, the water recovery rate and the crystal purity are improved, and zero discharge of wastewater is realized.

The invention discloses an efficient treatment process for salt-containing industrial wastewater, and relates to the technical field of wastewater treatment. Salt-containing industrial wastewater sequentially passes through an adjusting tank, a silicon and hardness removal unit, a biochemical unit, a secondary sedimentation tank, a fluorine removal unit, a filter unit, a catalytic ozonation unit, a moving bed bio-membrane reactor treatment unit, a powder carbon sedimentation unit and an ultrafiltration-reverse osmosis double-membrane unit to be treated, produced water is recycled, and concentrated water enters an evaporation and concentration unit; the silicon removal and hardness removal unit is used for treating the wastewater by adding a flocculating agent and a composite coagulant aid; the flocculating agent is a chitosan-based flocculating agent, and the addition amount of the flocculating agent is 10 to 20 mg / L; the composite coagulant aid is composed of a magnesium-aluminum hydrotalcite coagulant aid and alginic acid-silicate hybrid microgel according to the mass ratio of 2: (1-4), and the addition amount of the composite coagulant aid is 5-15 mg / L. The treatment effect of the salt-containing industrial wastewater is remarkably improved.

The invention provides a mine water softening and dosing system and a control method, and belongs to the technical field of water treatment equipment, and the mine water softening and dosing system comprises water treatment equipment, a detection mechanism, an adjusting mechanism and a control unit. Through cooperation of the detection mechanism and the control unit, feed-forward detection and feed-back detection of softening treatment of mine water are achieved, and the control unit can achieve determination of the initial feeding amount of drugs and adjustment of subsequent feeding according to the feed-forward detection and the feed-back detection; the flow, alkalinity and pH value of inlet water and outlet water as well as the turbidity and alumen ustum image of the outlet water are detected at the same time, and the control system can comprehensively sense the water quality change and the treatment effect according to the detection result, so that the refined and automatic adjustment of the addition of various medicaments is realized, the dependence on human eye observation and manual test is reduced, and the operation is simple and convenient. The intelligent level and the operation efficiency of the whole water treatment process are improved.

The invention discloses a hardness removal method and system for a sulfate-based mine water concentrated solution, and the method comprises the following steps: sequentially introducing the sulfate-based mine water concentrated solution into a coagulating basin and a flocculation basin for chemical treatment, and allowing the treated mine water concentrated solution to enter a sedimentation basin for standing to obtain softened effluent; wherein lime or sodium hydroxide and a coagulant are put into the coagulating basin, and the coagulating basin is used for carrying out coagulating treatment on the mine water concentrated solution; sodium carbonate, a coagulant aid and an inducer seed crystal are put into the flocculation basin and used for carrying out flocculation treatment and precipitation reaction on the mine water concentrated solution subjected to coagulation treatment, the standing time of the flocculation basin is 14-45 minutes, the precipitation reaction time is 6-30 minutes, and the excessive amount of sodium carbonate is 1.5-2.5 mmol / L. According to the invention, the hardness of calcium in softened water can be lower than 20mg / L.

The invention discloses a seawater carbon source and carbon sink cyclic conversion system and method, and the system comprises a seawater carbon sequestration unit which is used for receiving seawater and mixing the seawater with carbon dioxide and alkali to generate carbonate precipitate so as to obtain pre-softened seawater; the deep hardness removal unit is used for receiving the pre-softened seawater and treating the pre-softened seawater to obtain hardness-removed seawater; the deep concentration unit is used for receiving the hardness-removed seawater and concentrating the hardness-removed seawater to obtain concentrated seawater; the bipolar membrane unit comprises a salt chamber, an acid chamber and an alkali chamber and is used for receiving the concentrated seawater and preparing acid and alkali; and the seawater carbon capture unit comprises a first degassing film, a first adjusting tank, a second degassing film and a second adjusting tank which are connected in sequence. The bipolar membrane technology is adopted for treating softened seawater to prepare acid and alkali in situ, acid is provided for the seawater carbon sequestration unit, alkali is provided for the seawater carbon capture unit, the two processes of seawater carbon sequestration and seawater carbon capture are coupled, and acid and alkali consumption balance and seawater carbon source and carbon sink circulation conversion are achieved.

The invention discloses a circulating water blow-off water reuse treatment system, and relates to the field of circulating cooling water treatment, the system comprises: an induced crystallization unit, which is used for carrying out primary treatment on circulating water blow-off water through an induced crystallization fluidized bed reactor to remove hardness ions in water; the ceramic membrane filtering unit is used for carrying out secondary treatment on the primarily treated water by utilizing a ceramic membrane device and removing residual hardness ions, organic matters and suspended matters in the water; and the nanofiltration membrane unit is used for performing tertiary treatment on the water by utilizing a nanofiltration membrane according to the secondary treatment result to remove salt and organic matters in the water. According to the method, induced crystallization, ceramic membrane and nanofiltration membrane technologies are combined to cooperatively treat the circulating water and the blow-down water, so that the operation mode of simplifying the process, reducing the energy consumption and prolonging the backwashing period is realized, the dosage of chemicals and the generation of sludge are reduced, and the water recovery rate is also improved, so that the hardness is removed, and the calcium resource recovery is realized.

The invention provides a reinforced hardness removal device for a reclaimed water plant, and relates to the technical field of sewage treatment.The reinforced hardness removal device comprises a settling box, a square pipe fixedly communicated with the top of the settling box, a mixing box fixedly connected with the top end of the square pipe, a cleaning unit installed in the settling box, a pollution discharge unit installed on the lower portion of the settling box and a blocking and discharging component installed on the upper portion of the square pipe; a stirring unit is mounted in the mixing box; the cleaning unit comprises a driving cleaning part, a guide part and a telescopic part; the driving and cleaning part is used for pushing sediment at the bottom of the inner side of the sediment box to the blocking and discharging part; the guide part is used for providing a moving track for the driving cleaning part; according to the device, the electric cylinder drives the lifting frame to move and synchronously drives the mud pushing plate to move, the blocking plate to be opened and closed and the collecting rotary drum to rotate, automatic linkage of cleaning, discharging and feeding is achieved, manual operation is reduced, the treatment efficiency is improved, mixing, sedimentation and mud discharging are integrated on the same device, traditional split design is avoided, and the structure is more compact.

The invention discloses a purification and recovery process for cooperatively treating fly ash and waste incineration flue gas. The purification and recovery process comprises the following steps that S1, the waste incineration flue gas is subjected to cooling and heat energy recovery; s2, spraying activated carbon; s3, fly ash is captured; s4, spraying water to remove HCl, and collecting hydrochloric acid wastewater; s5, spraying alkali liquor to remove SO2, and collecting deacidified waste liquid; s6, the fly ash is subjected to acid pickling treatment with hydrochloric acid wastewater, and acid-pickled mud cakes are obtained; s7, carrying out water washing treatment on the acid-washed mud cake to obtain a water-washed mud cake; s8, treating the wastewater to obtain sodium chloride and potassium chloride; and S9, the washed mud cake is mixed with the gelling and curing base material, the mixture is cured and mixed with fresh garbage to be incinerated, and obtained ash residues are directly used as building materials. The production of fly ash is reduced from the source, the treatment cost of the fly ash is low, resource utilization is realized, and the problems of heavy metals and dioxin are solved; and heat energy is recycled, the heat energy utilization efficiency is improved, and the economical efficiency is enhanced.

The invention belongs to the technical field of wastewater treatment, and particularly relates to an intelligent dosing system and method for hardness and alkali removal wastewater. The monitoring unit is used for monitoring calcium hardness, magnesium hardness and alkalinity of inlet water and outlet water and monitoring the pH value in a reaction tank 1; the control system is in communication connection with the monitoring unit, receives the monitoring data, and is used for selecting a dosing mode according to the calcium hardness, magnesium hardness and alkalinity data of the inlet water, calculating the dosing amount and feeding back and adjusting the dosing and pH value according to the monitoring data of the outlet water; the chemical adding unit comprises a lime chemical adding device, a sodium hydroxide chemical adding device and a sodium carbonate chemical adding device which are respectively connected with the control system, and corresponding chemicals are added according to instructions of the control system; the treatment unit sequentially comprises a coagulation tank, a reaction tank 1, a reaction tank 2, a flocculation tank and a sedimentation tank. According to the invention, through automatic intelligent dosing, the purpose of removing alkalinity and hardness in water at the lowest cost is achieved.

The technology relates to the use of a high salinity produced water stream from a gas oil separation plant (GOSP), as a wash water stream for the desalter unit in a GOSP. The produced water stream is pretreated by a sequence of steps and subsequently desalinated by a ultra-high pressure reverse osmosis (UHP-RO) membrane. The UHP-RO produces a permeate stream and a reject stream. A portion of the permeate stream is reused as a wash water stream in the desalter unit of the GOSP.

Method for softening produced oilfield brine for enhanced oil recovery, the method including dissolving gaseous carbon dioxide and a base in a produced oilfield brine that includes divalent ions to yield solid carbonates, filtering the solid carbonates to yield a softened water, and injecting the softened water into a subterranean formation.

Methods, systems, and devices for PFAS destruction including providing water containing PFAS to a reactor vessel, irradiating the water with UV light under conditions to destroy at least a portion of the PFAS, passing the treated water through a selective membrane to form permeate and membrane reject comprising PFAS, providing the membrane reject back to the reactor vessel, providing additional water containing PFAS to the reactor vessel within the reactor vessel or before being provided to the reactor vessel, and irradiating the membrane reject and the additional water containing PFAS within the reactor vessel with UV light. The steps may be repeated a plurality of times such that PFAS that is not destroyed is recycled through the reactor vessel. Sensitizers may be added and may also be recycled in the membrane reject with the PFAS.

Methods, systems and devices for removing iodide from an aqueous solution including submerging an iodophilic electrode in an aqueous solution containing iodide, applying a current to the electrode, and electrochemically oxidizing the iodide to iodine within the electrode. The electrode may include an iodophilic material and an electrically conductive material. It may also include a binder. The iodophilic material may be a starch, chitosan, carboxycellulose, cationic polymer, or an anion exchange membrane material, for example. After oxidizing the iodide to iodine within the electrode, the electrode may be submerged in a second solution and a current may be applied to reduce the iodine and release it from the electrode in the form of iodide into the second solution.

The utility model belongs to the technical field of chemical spraying equipment of a crystallization granulation catalytic softening fluidization tower, and particularly relates to a chemical spraying head of the crystallization granulation catalytic softening fluidization tower. Comprising a shell, and a cavity is formed in the shell and used for storing liquid medicine; the connecting end is arranged at the bottom of the shell and used for connection, a connecting channel is formed in the connecting end, and the connecting channel communicates with the cavity; the cover plate covers the upper part of the shell and is used for sealing the upper part of the shell; the medicine spraying opening is formed in the upper part of the shell and is used for communicating a cavity in the shell with the outside; the elastic ring has elasticity, and the elastic ring is annularly arranged on the upper portion of the shell in a sleeving mode and used for blocking the medicine spraying opening. The liquid medicine spraying device solves the problem of uniform liquid medicine spraying of the fluidization tower.

The invention relates to the technical field of industrial wastewater treatment, in particular to a treatment method for treating high-sulfonic-group wastewater by advanced oxidation, which comprises the following steps: regulating the pH value of the wastewater to 3.0-4.0, then carrying out photo-Fenton oxidation, controlling the molar ratio of H2O2 to Fe < 2 + > to be 300: 1-400: 1, regulating the pH value of the effluent to 5.0-6.0, adding sodium sulfite to quench residual H2O2 and flocculate and precipitate iron mud, and finally, carrying out secondary oxidation on the wastewater to obtain the high-sulfonic-group wastewater. Performing anaerobic-aerobic biochemical treatment on the supernate, adding sodium carbonate and sodium hydroxide into biochemical effluent to soften and descale, concentrating in a mechanical vapor recompression evaporator, washing and recrystallizing crystallized mother liquor, and adsorbing and purifying the crystallized mother liquor with activated carbon to obtain an industrial salt product. The problem of MVR evaporation scaling is effectively solved by accurately controlling the neutralization pH and combining the softening step, finally, wastewater standard treatment and salt high-quality recovery are achieved, the COD removal rate can reach 95% or above, and excellent environmental and economic benefits are achieved.

The invention relates to a ferrate-calcium salt enhanced turbidity removal and water purification method based on ferrous ion activation, and aims to solve the technical problems that the effluent quality is difficult to guarantee when a traditional coagulant is used for treating low-temperature low-turbidity water or algae-laden water, and particularly the turbidity is easy to exceed the standard. The invention discloses a ferrate-calcium salt enhanced turbidity removal and water purification method, which comprises the following steps of: adding a ferrous compound, a calcium salt and ferrate into low-turbidity or high-algae raw water, uniformly stirring, controlling the molar ratio of the ferrous compound to the ferrate to the calcium salt to be (0.5-1.5): 1: (2-10), and standing and precipitating to complete the enhanced turbidity removal and water purification method of the low-turbidity or high-algae raw water. Calcium ions are introduced through calcium salt so as to effectively compress double electric layers on the surface of colloid and promote destabilization and coagulation, multiple synergistic effects of oxidation, coagulation, adsorption and coprecipitation are constructed through directional activation of ferrous ions on ferrate and synergistic interaction of the calcium ions, and therefore when complex water with low temperature, low turbidity, high algae and the like is treated, the treatment effect is good, and the treatment cost is low. The deep and efficient removal of turbidity and organic matters can be synchronously realized.

The invention discloses a reclaimed water stage treatment system and a non-ferrous smelting dual water supply system. The reclaimed water stage treatment system comprises an adjusting device, a primary treatment device and a secondary treatment device, the adjusting device is used for receiving reclaimed water, the primary treatment device comprises a physicochemical reaction unit and a first filtering unit, and the physicochemical reaction unit is used for removing heavy metals in the reclaimed water and adjusting the hardness of water; the first filtering unit is used for filtering impurities in the recycled water to obtain clear liquid, and part of the clear liquid generated by the first filtering unit is used for providing first produced water; the secondary treatment device is connected with the first filtering unit, the secondary treatment device is used for purifying residual clear liquid flowing out of the first filtering unit, purified water discharged by the secondary treatment device is used for providing second produced water, and concentrated water discharged by the secondary treatment device is used for providing third produced water. According to the invention, the reclaimed water can be subjected to stage treatment to obtain produced water with different water qualities, so that the process flow is optimized, and the economic benefit and the environmental benefit are improved.

A system for wastewater treatment includes a membrane filtration device that receives a pretreated wastewater stream from a pretreatment unit and produces a discharge stream that is supplied to an electrochemical oxidation reactor, the electrochemical oxidation reactor produces a reactor effluent stream, the reactor effluent stream is divided into a recirculated wastewater stream and a reactor discharge stream, the recirculated wastewater stream is recycled back to an equalization tank, and the reactor discharge stream is discharged from the system. A target fractional ratio between a volume of the recirculated wastewater stream and a volume of the reactor discharge stream is controlled based on a target total dissolved solids amount in the wastewater to be treated, based on an amount of organic matter in the wastewater that is treated by the electrochemical oxidation reactor to increase an efficiency of the electrochemical oxidation reactor to a target value, and based on a composition of the wastewater that is discharged from the system.

The utility model provides a vehicle-mounted water heater with constant temperature bin, including cold water inlet, heat exchanger, combustor, gas inlet, exhaust fan, hot water outlet and constant temperature bin, the cold water inlet is used for introducing outside cold water into the vehicle-mounted water heater, the heat exchanger is used for heating the cold water, the combustor is connected with heat exchanger, the gas inlet is connected with combustor and is used for inputting gas, the exhaust fan is used for discharging the waste gas generated after combustion, the hot water outlet is arranged at the water outlet end of heat exchanger, the constant temperature bin is arranged between heat exchanger and hot water outlet and is used for buffering and mixing the hot water after heating, the utility model discloses a constant temperature bin, and adopts double space separation structure inside, the hot water after heating needs first entering the space far from the water outlet end and then entering the water outlet area through the water hole, effectively changes the water flow path, makes the water fully mix, restrains temperature transient, makes the water outlet temperature more constant, and improves the use comfort.

A method of treating wastewater from a renewable fuel production comprises anaerobically digesting the wastewater to produce digestate and sludge, aerobically treating the digestate to produce an effluent and a second sludge, separating the effluent into a first filtrate and a first reject, treating the sludge, second sludge, and first reject in a solids-liquid separation apparatus to produce recovered water, directing the recovered water into the mixing tank, filtering the first filtrate in a nanofiltration unit to produce a second filtrate and a second reject, filtering the second filtrate in a first reverse osmosis unit to produce a third filtrate and a third reject, filtering the third reject in a second reverse osmosis unit to produce a fourth filtrate and a fourth reject, combining the third filtrate and fourth filtrate to form a product water, and combining the second reject and the fourth reject into a combined reject for disposal.

The application belongs to the technical field of comprehensive management of saline-alkali land and circular agriculture, and particularly relates to a multi-stage circular agriculture system and method for saline-alkali land based on multi-stage resource utilization of saline-alkali water, which comprises the following steps: through the technical chain of terrace land reclamation, seawater-like regulation, reverse osmosis desalination, planting and breeding coupling and tail water circulation, efficient cyclic utilization of natural resources in the saline-alkali area is realized. The method mainly comprises the following steps: after the saline-alkali water in the saline-alkali area is detected, the saline-alkali water is extracted for seawater-like regulation, the regulated saline-alkali water is obtained, and then the saline-alkali water is desalinated through a reverse osmosis system, and fresh water and seawater-like water are obtained, which are used for crop planting and aquatic product breeding, respectively, and the breeding tail water is recycled after solid-liquid separation. The system and method have the advantages that the system does not need external supply of fresh water, is self-contained, achieves win-win of ecological benefit, social benefit and economic benefit, realizes green and sustainable development, and has universal popularization value for comprehensive development and utilization of saline-alkali land.

An improved process for the recovery of heat from geothermal water by adding calcium hydroxide in a controlled manner to transform silica dissolved in the water into suspended calcium silicate hydroxide thereby reducing silica deposition and enabling more heat to be recovered from the water.

The present application relates to a kind of PVA fiber production wastewater treatment method and device.Wastewater is after entering multiple medium filter by homogeneous adjustment pH, reduce the content of suspended solids in wastewater.Multiple medium water production uses ultrafiltration system to reduce the content of suspended solids and colloid.Ultrafiltration water production enters the first reverse osmosis membrane concentration, the first reverse osmosis membrane concentrated water is used to remove hard filter to remove hard, the water production of remove hard filter is used to further concentrate by second reverse osmosis membrane system.Second reverse osmosis membrane concentrated water is after ion concentration deployment system, concentrated water is treated by crystallization, most of crystallization mother liquor is backflowed to ion concentration deployment system, ion concentration deployment water production is further concentrated by third reverse osmosis membrane, third reverse osmosis membrane concentrated water is treated by power plant ash spray, the water production of three reverse osmosis units is further reduced by senior oxidation after reuse.

The invention discloses a bipolar membrane electrodialysis-based carbonate brine treatment method and device, carbonate brine is added into a prepared low-concentration sodium metaaluminate solution through a chemical precipitation tank for precipitation reaction, suspended solids are removed through a filter, organic matters are removed through an activated carbon adsorption tower, and finally a refined solution is obtained through an ion exchange system; the refined liquid is introduced into a treatment device salt chamber, the voltage is controlled to be 1.5-2.5 V / membrane pair, and circular treatment is performed; deionized water is supplemented to the alkali chamber and the acid chamber respectively, high-purity NaOH is obtained in the alkali chamber, and high-purity carbon dioxide is obtained in the acid chamber. According to the present invention, the efficient separation treatment of the carbonate brine is achieved, the impurities can be effectively removed, the high-purity NaOH and the high-purity carbon dioxide are obtained, the treatment energy consumption is low, the cost is controllable, and the high-value resource utilization of the carbonate brine is achieved.

The application discloses an energy-saving water quality treatment equipment and belongs to the field of water quality treatment equipment. The energy-saving water quality treatment equipment comprises a water quality treatment cylinder, a wastewater stirring assembly is arranged at the top of the water quality treatment cylinder, a wastewater treatment assembly is arranged in the wastewater stirring assembly, and a wastewater filtering assembly is arranged at the right side of the water quality treatment cylinder. The water quality softening and flocculation process are combined to improve the treatment efficiency. The direct guide groove directly sprays flocculants into water bodies, improves the mixing effect of the flocculants and the water bodies, so that the flocculation effect is better and the reaction is more sufficient. The upper stirring rod and the lower stirring rod of the upper layer respectively stir the water bodies. The upper stirring rod of the upper layer accelerates the flocculation process, and the lower stirring rod of the lower layer has a lower rotating speed, promotes the collision and agglomeration of particles in the water bodies, and helps the sedimentation formation, and will not damage the formed flocculation bodies and hardness sediment particles, thereby improving the sedimentation rate.

The present application relates to the field of air compression station, especially to a digital energy air compression station water circulation system capable of preventing blockage, which is used for water circulation system of air compression station heat dissipation, comprising: intelligent regulating valve, water quality softening tank, multifunctional intelligent control system, wherein: the intelligent regulating valve, the multifunctional water circulation system and the water quality softening tank pipeline are connected, the intelligent regulating valve is wirelessly connected with the multifunctional intelligent control system; the multifunctional intelligent control system comprises a data collection module, an evaluation module and an execution module, the evaluation module analyzes and judges each sensing value based on a technical solution improved based on a neural network algorithm, and the execution module is used for executing the judgment of the evaluation module to control the water quality softening tank for easy descaling; the present application obtains optimal control measures through the evaluation module to efficiently soften water quality and avoid blockage, and through the self-checking module, error points are easily obtained and timely notified, so as to achieve efficient operation of the air compression station.

The utility model relates to the field of wastewater treatment, in particular to a system for treating pretreated waste incineration fly ash washing wastewater. Comprising a fly ash temporary storage bin, a fly ash conveying system, a fly ash pre-dissolving tank, a fly ash washing system, a first solid-liquid separation device, a second solid-liquid separation device, a raw water pool, a hardness removal system, a second solid-liquid separation device, a COD (Chemical Oxygen Demand) removal system, a pH (Potential of Hydrogen) adjusting system, filtering equipment and evaporative crystallization equipment, the fly ash washing system is used for treating the slurry output by the fly ash pre-dissolving tank, so that heavy metal in the slurry is stabilized in the slurry, metal salt is washed out, and a first mud-water mixture is finally obtained; the slurry output by the fly ash pre-dissolving tank can be treated through the fly ash washing system, so that heavy metals in the slurry are stabilized in the slurry, the construction cost and the treatment cost of subsequent wastewater treatment are reduced, the risk caused by hazardous chemicals is avoided, and the comprehensive energy consumption is relatively low.

The invention relates to the technical field of inorganic salt mother liquor treatment, in particular to an inorganic salt mother liquor recycling system based on MVR evaporative crystallization, which comprises three groups of sedimentation tanks and separation cylinders fixedly communicated with the bottoms of the sedimentation tanks, stirring components and sealing conical seats are arranged in the separation cylinders, and the tops of the sedimentation tanks are connected with liquid storage hoppers through liquid inlet pipes. An electromagnetic control valve is arranged on the liquid inlet pipe, and a calcium hydroxide solution, a sodium carbonate solution and a barium chloride solution are sequentially arranged in the multiple liquid storage hoppers from left to right; through staged treatment of the three groups of sedimentation tanks, the ion selective electrode sensor and the controller are combined to precisely add corresponding agents, the hetero ions are removed step by step in a targeted manner, and the subsequent progressive deep purification treatment is matched, so that a high-quality water quality basis is provided for efficient recycling of the mother liquor; and the problems of crystal quality reduction, equipment scaling and the like caused by hetero-ion enrichment are effectively avoided.

Methods, systems and devices for removing iodide from an aqueous solution including submerging an iodophilic electrode in an aqueous solution containing iodide, applying a current to the electrode, and electrochemically oxidizing the iodide to iodine within the electrode. The electrode may include an iodophilic material and an electrically conductive material. It may also include a binder. The iodophilic material may be a starch, chitosan, carboxycellulose, cationic polymer, or an anion exchange membrane material, for example. After oxidizing the iodide to iodine within the electrode, the electrode may be submerged in a second solution and a current may be applied to reduce the iodine and release it from the electrode in the form of iodide into the second solution.