484results about "Water softening" patented technology

The disclosure relates to an intelligent dosing control method, device and system for softening and removing hardness. Based on calculation by the intelligent dosing control method or device for softening and removing hardness of the disclosure, a softening agent dosing scheme can be intelligently recommended, while allowing the dosage adjustment in real time, thereby realizing the real-time and precise dosing of agents throughout the process. The intelligent dosing control system for softening and removing hardness of the disclosure automatic monitors the inlet water quality, and the dosing device can be controlled to perform precise dosing of agents through the calculation by the intelligent dosing control method or device for softening and removing hardness. Based on the monitoring feedback of outlet water quality and then calculation by the intelligent dosing control method and / or device for softening and removing hardness, the agent dosage can be automatically readjusted.

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 relates to the technical field of industrial production wastewater treatment, and particularly provides a resource utilization method of calcium chloride high-salt water containing high-concentration organic matters. The method comprises the steps of pretreatment, wet catalytic oxidation, salt type conversion, softening filtration, deep oxidation, nanofiltration purification and targeted adsorption, no residual mother liquor exists, no secondary pollution is generated, organic matters in effluent are stable and reach the standard, the water quality and water quantity fluctuation resistance is high, heterogeneous and homogeneous catalysts are combined for catalysis, and the purification effect is good. According to the method, the sodium chloride solution is used as a raw material, the homogeneous catalyst is recycled, in addition, most of salt in the homogeneous catalyst is also recycled, resource reutilization is fully achieved, the treatment cost is reduced, and the treated sodium chloride solution can be used as primary saline water for subsequent ion membrane electrolysis.

The invention relates to the technical field of wastewater treatment in the water treatment technology, in particular to a wastewater treatment multistage dynamic quantification control system based on result feedback, which comprises a storage module, an identification module, a quantification module and an execution module, the storage module stores a causal chain in a reaction process, the identification module identifies a matching state of a current operation parameter and the causal chain and enables the quantification module to determine a risk index, and the execution module performs control optimization to execute corresponding measures based on the determined risk index. Tracking intervention from a pollution source to a derivation phenomenon is realized, a pollution migration problem implied in wastewater treatment is converted into an identification item of quantitative operation, and limitation of traditional single-point identification control is broken through through sequential logic verification and a multi-dimensional matching degree fusion mechanism. The accuracy of membrane pollution prevention and control and the resource utilization efficiency are improved while the process continuity is guaranteed, and a closed-loop control normal form of traceability pre-judgment dynamic quantification grading interception is formed.

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.

A water treatment system centrally communicates and controls one or more water treatment devices to regulate the use of the one or more water treatment devices. The water treatment system is configured to enable a localized, on-demand supply of purified water throughout a building or a network of buildings. The water treatment system may control a degree of purity (e.g., water hardness or concentration of dissolved salts) via mixing of purified and unpurified water streams in a controllable ratio (e.g., via one or more controllable valves or one or more tunable water softening units).

The invention relates to the technical field of water treatment, and mainly relates to a composite electrode unit, an electrochemical water treatment system and an electrochemical water treatment method. The composite electrode unit comprises an electrolyzed water cathode, a porous insulating filler layer and an electrolyzed water anode; the porous insulating filler layer is positioned between the electrolyzed water cathode and the electrolyzed water anode; the internal material of the porous insulating filler layer does not contain exchangeable ions, and the internal part refers to a non-surface part. According to the device, a cathode and an anode are respectively integrated on two sides of a porous insulating filler layer to form a unique composite electrode unit with a filler-electrode integrated structure. Under the driving of ultra-low direct-current working voltage, the transfer of water is controlled through filler micro-channels to realize the migration blocking of hydroxyl radicals, and meanwhile, the hydroxyl radicals are diffused into a water-phase main body of a cathode chamber by virtue of a local gradient diffusion effect generated by a catalytic reaction on the surface of an electrode and a forced diffusion effect of pumping; and scale-forming ions are quickly crystallized and separated out in a cathode region, and the hardness of water is reduced.

The invention relates to a treatment method and device for resource utilization of desulfurization wastewater in the technical field of desulfurization wastewater treatment, and the device comprises a pretreatment module, a magnesium removal module, a calcium removal module, a nanofiltration salt separation module, a concentration reduction module and a flue evaporation module, the method comprises the steps of pretreatment, magnesium removal treatment, calcium removal treatment, nanofiltration salt separation treatment, evaporative crystallization treatment and the like, heavy metals and suspended solids in the desulfurization wastewater are removed in the pretreatment module, a high-purity magnesium hydroxide product is extracted through the magnesium removal module, after calcium ions are removed in the calcium removal module, salt separation treatment is conducted through the nanofiltration salt separation module, and the high-purity magnesium hydroxide product is obtained. One part of the separated monovalent saline water is recycled, the other part of the separated monovalent saline water is concentrated and reduced by the concentration and reduction module and then enters the flue evaporation module to be evaporated, and the separated divalent saline water is recycled to a desulfurization system. The method has the advantages of simplicity and convenience in operation, economical operation, environment-friendly process and the like, high-purity magnesium hydroxide can be recycled, complete zero emission of the desulfurization high-chlorine wastewater is realized, and the method has a relatively high commercial application value.

The invention belongs to the field of high-salinity organic wastewater treatment, and particularly relates to a shale gas high-salinity wastewater electrochemical catalysis coupling membrane separation low-carbon treatment method which comprises the steps of pretreatment, electrocatalytic oxidation, membrane separation, salt recycling and product recovery, intelligent management and control, energy coupling and the like. Through cooperation of an electrochemical catalysis coupling membrane separation technology and mass transfer strengthening, anti-pollution design and intelligent optimization of an intelligent energy system, the treatment efficiency and the recycling level of the shale gas high-salinity wastewater can be remarkably improved, and low-carbon, economical and efficient treatment of the shale gas high-salinity wastewater is achieved; and the method can also be used for treating similar high-salt organic wastewater generated by conventional oil and gas resource development, and has good popularization and application prospects.

The invention relates to the technical field of fracturing flow-back fluid treatment, and discloses a fracturing flow-back fluid discharge treatment process and device.The fracturing flow-back fluid discharge treatment process comprises a pretreatment unit, a membrane concentration reduction unit and a deep treatment unit, and the pretreatment unit comprises an oxidation gel breaking reaction zone, an air flotation treatment zone and a magnetic coagulation reaction system; comprising the following steps: S1, the fracturing flow-back fluid firstly enters a regulating tank and then enters an oxidation gel breaking reaction zone; s2, entering the air flotation treatment area; s3, the wastewater firstly enters the hardness removal reaction tank and enters the coagulating sedimentation area for reaction, and the precipitated sludge enters the magnetic powder recovery subunit; s4, water discharged from the pretreatment system enters a membrane concentration decrement unit; s5, the membrane concentrated solution enters a BDD electrooxidation system, organic matter in water is oxidized through a BDD electrode, BDD effluent enters an MVR evaporation system to be evaporated, and MVR evaporation mother liquor enters a mother liquor drying system. According to the invention, the treatment efficiency of the fracturing flow-back fluid can be improved on the whole.

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 belongs to the technical field of direct drinking water processing, and particularly relates to a direct drinking water softening and sterilizing device which comprises a bottom plate, the two sides of the upper end face of the bottom plate are fixedly connected with a softening pool and a sterilizing pool respectively, one side of the bottom of the softening pool is communicated with the sterilizing pool through a connecting pipe, and a drainage pipe is arranged on one side of the sterilizing pool. An ultraviolet germicidal lamp is arranged at the top of an inner cavity of the sterilization tank, and a feeding auxiliary mechanism used for uniformly adding lime and soda into the softening tank is further arranged on the softening tank. By means of the feeding auxiliary mechanism, lime and soda discharged from the discharging port can make contact with leaves, the lime and the soda are scattered, the distribution area of the lime and the soda on the water surface is enlarged, meanwhile, the caked and coagulated lime and the soda can also be scattered, and therefore the lime and the soda can be evenly added into water, and the situation that the lime and the soda are not prone to falling off due to the fact that the water surface area is too large is avoided. And an operator is not easy to uniformly add lime and soda into water.

The present invention discloses a zero-emission process for the coordinated treatment of multi-source wastewater in a steel mill. This process features zero-emission selective separation of desalted water and coal gas condensate from a softening station, recovery of natronasite from cold-rolling rinsing wastewater using high-pressure nanofiltration concentrate, coordinated treatment of high-pressure reverse osmosis concentrate with desulfurization wastewater and high-salt solid waste ash, and low-cost treatment of ammonia and nitrogen. The coordinated treatment of multi-source wastewater and high-salt solid waste ash significantly reduces the pollutant content in ash washing water, thereby reducing subsequent wastewater treatment costs and wastewater usage, significantly lowering the disposal costs of solid waste and wastewater, and achieving internal consumption and zero-emission of multi-source wastewater.

Methods, systems and devices for PFAS destruction including adding a sulfite salt to an aqueous solution containing PFAS and then irradiating the aqueous solution with light at 222 nm. The method may include adding a base to the aqueous solution in an amount sufficient to raise a pH of the aqueous solution including PFAS to about 10 or more. It may also include adding a halide salt such as a bromide salt or an iodine salt, and further adding a carbonate. Greater than 90%, or greater than 99%, of the PFAS in the solution may be destroyed by irradiating the aqueous solution in this way.

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 present invention relates to a multifunctional safe water purification coagulant aid, its preparation process and application. The water purification coagulant aid includes components A, B, and C. Component A includes anionic PAM and a first multifunctional additive. Component B includes sodium sulfate, an acid-base regulator, a second multifunctional additive, and a stabilizer. Component C includes a low-molecular-weight flocculant, sodium silicate, sodium carbonate, and a dispersant. When using the water purification coagulant aid of the present invention, the technical product of the present invention is used in combination with a suitable coagulant represented by PAC for water treatment. Generally, the dosage of PAC can be reduced by 70-80%, the sedimentation time is shortened by about 70%, and the turbidity of the supernatant in the sedimentation tank can reach below 0.1 NTU after secondary purification by filtration. Moreover, the residual AM monomer in the dry powder of the technical product of the present invention is less than 12 ppm, and there is a major breakthrough in safety compared with similar water purification coagulant aids, having huge technical advantages, a wider application field, and important practical economic significance and far-reaching social significance.

A system for softening high-salinity water via self-induced calcium bicarbonate crystallization in a fluidized bed, including a fluidized bed-based crystallization-softening reaction unit, a water feeding unit, a dosing unit and a regulation unit. The fluidized bed-based crystallization-softening reaction unit is configured to induce a crystallization reaction to soften high-salinity water. The water feeding unit is configured to supply high-salinity water to the fluidized bed-based crystallization-softening reaction unit. The dosing unit is configured to supply a pH regulating agent to the fluidized bed-based crystallization-softening reaction unit. The regulation unit is configured to perform reflux replenishment for the fluidized bed-based crystallization-softening reaction unit and recover escaping crystals. A high-salinity water softening method using such system is also provided.

The invention relates to the technical field of water treatment, in particular to a leachate treatment system and method.The system comprises an oxidation module, a hardness removal module, a first adsorption module, a second adsorption module and a monitoring module, and the oxidation module is used for degrading macromolecular organic matter and comprises a Fenton reactor, an ozone generator and an electrocatalytic oxidation device; the hardness removal module is used for removing heavy metals, fluorosilicone and suspended matters, and comprises a dual-alkali reaction tank and a tubular ultrafiltration membrane; the first adsorption module is used for adsorbing organic matters in the leachate through activated carbon; the second adsorption module comprises a first resin exchange tower for selectively adsorbing residual hardness and heavy metal and a second resin exchange tower for adsorbing fluoride and silicate; the monitoring module comprises a group of flow velocity sensors and a group of voiceprint collectors which are respectively arranged on a pipeline in the liquid inlet direction of the tubular ultrafiltration membrane and a pipeline in the liquid outlet direction of the first adsorption module; and the processing quality is effectively improved by comparing the voiceprint with the monitoring processing process under the characteristic flow rate.

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 utility model relates to a wastewater treatment system which comprises an adjusting tank, a first-stage reaction unit, a second-stage reaction unit, a third-stage reaction unit and a filtering unit which are connected in sequence, wherein the adjusting tank is used for mixing evaporative crystallization mother liquor with waste acid to obtain mixed liquor; the first-stage reaction unit is used for adding lime milk into the mixed liquid for neutralization reaction to obtain first supernate; the second-stage reaction unit is used for removing chloride ions in the first supernate by using an ultrahigh lime aluminum method to obtain second supernate; the third-stage reaction unit is used for performing hardness removal treatment on the second supernate to obtain third supernate; the filtering unit is used for filtering the third supernate and then sending the filtered third supernate to the front end of the wastewater zero discharge system for retreatment. The evaporative crystallization mother liquor and the waste acid are synchronously treated by adopting the technologies of neutralization reaction, ultrahigh lime aluminum method, hardness removal, filtration and the like, so that components such as COD (Chemical Oxygen Demand), sulfate radicals, chloride ions and the like in the evaporative crystallization mother liquor and the waste acid can be removed in a sludge form.

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 invention discloses a method and a system for co-processing rain sewage wastewater in the non-ferrous metal resource recycling industry, the rain sewage wastewater comprises rainwater, general production wastewater, acidic wastewater and acidic wastewater, and the method comprises the following steps: carrying out coagulating sedimentation, filtration and low-pressure reverse osmosis desalination treatment on the rainwater and the general production wastewater; concentrated water of reverse osmosis is used as a liquid preparation of lime milk of waste acid wastewater and acidic wastewater; the method comprises the following steps: carrying out vulcanization reaction on waste acid wastewater and acid wastewater, carrying out neutralization treatment with lime milk, softening, filtering, resin softening, reverse osmosis and evaporative crystallization treatment, taking evaporated steam condensate as reuse water, and carrying out resource utilization on salt obtained by evaporative crystallization. According to the invention, zero discharge of wastewater generated in the non-ferrous metal recovery process can be realized, no wastewater is discharged to the outside, and natural water and soil are ensured not to be polluted.

The utility model discloses a power plant circulating water make-up water hardness removing device which comprises a treatment tank, a mounting frame fixedly arranged at the top of the treatment tank, a motor fixedly arranged at the side end of the mounting frame, a rotating shaft fixedly arranged at the output end of the motor, and a spiral blade fixedly arranged at the bottom end of the rotating shaft and penetrating through the top of the treatment tank. A plurality of fulcrum shafts are rotatably arranged at the top of the treatment tank, the bottom ends of the fulcrum shafts penetrate through the top of the treatment tank and are fixedly provided with stirring blades, a transmission assembly for driving the fulcrum shafts to rotate is arranged on the rotating shaft, a connecting pipe is fixedly arranged at the bottom of the treatment tank, a filter box is fixedly arranged at the bottom end of the connecting pipe, and a filter screen is arranged on the inner side of the filter box; a drainage port is formed in the bottom of the filter box. The filter screen is used for filtering, residues are intercepted on the filter screen, supplementary water penetrates through the filter screen and is discharged through the water outlet, when the residues generated in the reaction need to be collected and treated, the handle is held by a hand to pull outwards, the filter screen is pulled out, then the residues intercepted on the surface of the filter screen are collected and treated, and use is very convenient.

The invention belongs to the technical field of thermal power plant circulating water and sewage pretreatment, and relates to a circulating water lime softening system and method based on seed crystal circulation and intelligent control. Comprising a raw water tank, a lime softening tank, a flocculation reaction tank, a clarification tank and a softened water tank, through the synergistic effect of the seed crystal reflux circulation and the intelligent control technology, the softening efficiency is remarkably improved, the medicament consumption and the sludge output are reduced, and the resource utilization of the calcium carbonate byproduct is realized; according to the system, through organic connection of the raw water tank, the lime softening tank, the flocculation reaction tank, the clarification tank and the softening water tank, accurate adding of lime, sodium carbonate, seed crystal and a flocculating agent is combined, and whole-process water quality on-line monitoring and intelligent regulation and control are matched, so that efficient softening treatment of circulating water blow-down water is realized, stable and up-to-standard effluent quality is ensured, and the quality of discharged water is improved. Meanwhile, the operation cost and the treatment effect are optimized.

The invention belongs to the technical field of water treatment brine reuse, and provides an electrochemistry-based brine calcium and magnesium graded extraction process, which comprises the following steps: brine enters a primary electrolysis device for electrochemical reaction, carbon dioxide is introduced, and calcium ions in the brine are precipitated; further entering a primary precipitation separation device, and intercepting and collecting precipitated calcium; then the brine enters a secondary electrolysis device, the density of current applied to an electrode is increased, and magnesium ions in the brine are precipitated; the solution enters a secondary precipitation separation device, and precipitated magnesium is intercepted and recycled; drying the separated calcium and magnesium precipitates to obtain a product; and finally, introducing the reacted effluent into an ion exchange resin chromatographic column to remove untreated calcium and magnesium ions, and applying the obtained hardness-free alkaline water to the hydrogen production industry. By regulating the current density and introducing CO2, calcium and magnesium in various kinds of saline water are respectively precipitated and extracted, and the device is suitable for salt-containing organic wastewater, seawater, seawater desalination concentrated solution, bitter brine and industrial circulating cooling water.

The utility model relates to a device for reducing hardness of wastewater, which comprises a reaction device, an outlet of the reaction device is connected with a reaction and separation integrated device, the reaction and separation integrated device comprises a reaction cylinder arranged at the bottom and a scum hopper arranged at the top, and a water distribution cylinder arranged above the reaction cylinder is communicated with the reaction cylinder in a sleeving manner; the bottom of the reaction cylinder is communicated with a water distribution pipeline system, the water distribution pipeline system is used for inputting different materials into the reaction cylinder, and a material outlet is formed in the top of the reaction and separation integrated device; and the material outlet is connected with an inlet of the water producing pool. By means of the low-hardness wastewater treatment device, the hardness of high-hardness wastewater can be stably reduced to 20-30 mg / L, and the treatment cost is low.