525 results about "Electroplating wastewater" patented technology

The invention relates to the technical field of electroplating wastewater treatment, in particular to electroplating wastewater treatment equipment based on multistage filtration. The invention provides electroplating wastewater treatment equipment based on multi-stage filtration, which can quickly and effectively separate and discharge wastewater and precipitates. Electroplating wastewater treatment equipment based on multi-stage filtration comprises a support, a connecting pipe, a spherical valve and the like, the connecting pipe is connected to the upper portion of the support, and the spherical valve is rotationally arranged on the upper portion of the connecting pipe. A servo motor is started, a rotating bin is rotated through a first gear assembly, electroplating wastewater enters a lifting bin to be discharged through a filtering bin under the centrifugal effect, sediment is intercepted in the filtering bin, then an air cylinder is started, the lifting bin is pushed to move upwards, the rotating bin is rotated, and the sediment is discharged into a sediment collecting pool; the effect of quickly and effectively separating and discharging the wastewater and the precipitate is achieved.

The invention relates to the technical field of electroplating equipment, in particular to electroplating wastewater treatment equipment which comprises a reaction cylinder, an air inlet pipe extending into an inner cavity of the reaction cylinder is fixedly connected to the side wall of the reaction cylinder in a penetrating manner, one end of the air inlet pipe is fixedly communicated with a vertical pipe, a rotating shaft is rotatably mounted in an inner cavity of the vertical pipe, and an aeration inner cylinder is fixedly arranged at the lower end of the vertical pipe; the steel wire mesh is arranged into an upper-layer structure and a lower-layer structure which are mutually rotated and staggered, and the driving gear and the inner gear ring are in transmission connection through a transmission gear; the device has the beneficial effects that a steel wire mesh is arranged at the upper end of a vertical pipe, the steel wire mesh is of an upper-lower double-layer structure and is mutually rotated and staggered, a driving gear is arranged at the upper end of a rotating shaft, a transmission gear is arranged between the driving gear and an inner gear ring for transmission, and floating bubbles can be effectively cut when the steel wire mesh rotates, so that the sizes of the bubbles are kept in a small state; the adhesion effect on fine suspended matters is improved, so that the treatment effect on the electroplating wastewater is improved.

The invention provides an electroplating wastewater dosage prediction system based on a dynamic flow-concentration coupling model, and relates to the technical field of industrial wastewater treatment.The electroplating wastewater dosage prediction system is characterized in that the dynamic flow-concentration coupling model is established by collecting real-time flow and heavy metal ion concentration parameters of a wastewater treatment system; the method comprises the following steps: identifying a time-lag relationship and coupling strength between flow change and concentration fluctuation, generating a flow-concentration coupling strength matrix, constructing a dosage prediction curve by adopting a piecewise linear mapping method on the basis of the matrix, performing matching positioning on a current flow-concentration coupling state, and performing gradient pulse dosage parameter prediction by applying a gradient pulse dosage parameter prediction technology. And the dosage of the medicament can be accurately predicted. Therefore, the problems that the removal rate of partial heavy metals is reduced, the medicament utilization rate is low, and even secondary pollution is possibly caused or the operation cost is obviously increased due to the fact that the adding amount and the adding time sequence of various medicaments are difficult to adjust timely and accurately can be solved.

The invention discloses an electroplating wastewater heavy metal content monitoring system, particularly relates to the field of electroplating wastewater monitoring, is used for solving the problem of influence of bubble interference on heavy metal content monitoring precision, and aims at dynamic characteristics of bubble kick interference, and through identification and threshold screening, distribution and recovery characteristics of interference signals are extracted. Therefore, the accuracy and adaptability of the correction threshold are ensured. On the basis, multi-stage self-adaptive filtering is applied to carry out point-by-point noise elimination and filtering on the monitoring data, so that effective isolation of kick interference is realized, and a continuous and real heavy metal concentration curve is obtained; performing traceability analysis on the pure data after noise elimination in combination with historical data, generating a kick compensation coefficient and returning the kick compensation coefficient to an identification link to form a self-adaptive closed loop, and optimizing a subsequent interference correction effect; therefore, the method has high anti-interference performance and long-term correction stability in a complex fluid environment, ensures real-time accuracy and consistency of heavy metal monitoring, and effectively solves the problem of hidden influence of bubble interference on online monitoring precision.

The invention belongs to the technical field of electroplating wastewater treatment, and particularly relates to a treatment process of emulsified oil wastewater for oil removal before plating of electronic products. A chemical demulsification and membrane separation technology is adopted to carry out demulsification separation on the emulsified oil wastewater, demulsifier molecules adsorb oil drops, a separation interface is promoted to be broken, and finally flocculation is carried out to form clusters, so that the demulsification effect is achieved, a clarified water sample can be obtained, and the ion content is reduced; the demulsified and separated wastewater is flocculated by adopting PAC + PAM, and the sedimentation of organic matters and metal ions in the wastewater is promoted by virtue of the properties of charge neutralization and colloid adsorption, so that the flocculation effect is achieved, a water sample is clear and transparent, the metal ions and COD (Chemical Oxygen Demand) values are reduced after flocculation separation, COD and heavy metal ions are removed, and the aim of treating the emulsified oil wastewater is fulfilled.

The invention discloses a zero discharge process for electroplating wastewater membrane separation, and relates to the field of wastewater discharge, and the zero discharge process comprises the following operation steps: S1, setting up discharge equipment; s2, carrying out micro-electrolysis reaction; s3, advanced oxidation reaction; s4, filtering treatment; s5, membrane treatment: the pretreated electroplating wastewater enters a first-stage RO device, effluent of the first-stage RO device enters a second-stage RO device, salt and organic matter solution intercepted by a first-stage RO membrane is discharged as concentrated water of the membrane, enters a concentrated water RO membrane device and is further filtered in the concentrated water RO membrane device, effluent of the concentrated water RO membrane is recycled, and concentrated water enters the concentrated water RO membrane device and is filtered again; and S6, carrying out evaporation treatment. According to the zero-discharge process for electroplating wastewater membrane separation, when electroplating wastewater is discharged, the dosage of chemicals such as coagulant can be reduced, organic matters in water can be removed by utilizing a chemical oxidation method, and meanwhile, the method is high in water recovery rate, stable in water quality and small in concentrated water generation amount.

The invention discloses an electroplating wastewater zero-discharge process based on a roll-type packaged RO membrane, and relates to the field of wastewater discharge, and the electroplating wastewater zero-discharge process comprises the following steps: S1, micro-electrolysis treatment; s2, advanced oxidation treatment; s3, ultrafiltration treatment: the electroplating wastewater subjected to advanced oxidation treatment enters a first-stage RO device, effluent of the first-stage RO device enters a second-stage RO device and then enters a concentrated water RO membrane device, effluent of a concentrated water RO membrane is recycled, concentrated water enters the concentrated water RO membrane device to be filtered again, produced water generated by the concentrated water RO device is recycled for production, and the concentrated water enters an ultrahigh-pressure RO device to be concentrated again; and S4, evaporation treatment. According to the electroplating wastewater zero-discharge process based on the roll-type packaged RO membrane, when the electroplating wastewater is discharged, the dosage of chemicals can be effectively reduced, and organic matters in the electroplating wastewater can be removed by utilizing a chemical oxidation method, so that the whole process is more stable and simpler, and the process is high in water recovery rate, stable in water quality and low in cost. And the generation amount of concentrated water is less.

The invention discloses an electroplating wastewater concentration and filtration system and method based on secondary RO, and relates to the field of electroplating wastewater concentration and filtration, and the system comprises a pretreatment unit, a primary RO unit, a secondary RO unit, a concentration treatment unit and a control unit. According to the electroplating wastewater concentration and filtration system and method based on the secondary RO, secondary RO treatment can further improve water quality on the basis of primary RO, molecular pollutants and salt of different sizes can be gradually removed by accurately designing performance parameters and an arrangement mode of two stages of RO membrane assemblies, and compared with traditional primary RO treatment, the system and the method have the advantages that the water quality is improved, and the cost is reduced. According to the system, the recycling rate of the electroplating wastewater can be increased to 90% or above from 60%-70%, the taking amount of fresh water is greatly reduced, meanwhile, the water quality of secondary RO fresh water can meet the high requirement for rinsing water in the electroplating process, the product quality can be effectively guaranteed, the defective rate caused by the water quality problem is reduced, and the production benefit is improved.

The invention provides a sedimentation tank for electroplating wastewater treatment and a sedimentation treatment method thereof, and relates to the field of electroplating wastewater treatment. The support is fixedly arranged on one side of the pool body, and a fixing ring is fixedly arranged on one side of the support. During use, an external power switch of a driving motor is turned on, a rotating rod is further driven to rotate, so that first stirring blades rotate, two second gears are driven by a first gear to rotate, and the first stirring blades are driven to rotate; two second stirring blades rotate through two transmission rods, the first stirring blade stirs wastewater close to the upper layer, and the two second stirring blades stirs wastewater close to the lower layer, so that suspended solids on the water surface and precipitates and chemicals in a deeper water area are fully fused and reacted, and therefore, when the sedimentation tank treats electroplating wastewater, the chemicals are fully contacted with pollutants in water, and the electroplating wastewater treatment effect is improved. And suspended matters on the water surface or sediments in a deeper water area can be uniformly distributed and reacted, so that the use efficiency of the medicament is improved, and the reaction effect is improved.

The invention discloses a post-electroplating wastewater treatment system and treatment method with graded recovery, and relates to the technical field of electroplating wastewater treatment.The post-electroplating wastewater treatment system comprises a recovery cylinder, a primary separation unit, a chemical adding unit, a final-stage separation unit and a driving unit, and the recovery cylinder is used for mounting and fixing the primary separation unit, the chemical adding unit, the final-stage separation unit and the driving unit; the primary separation unit is used for separating greasy dirt and precipitated impurities, the chemical adding unit is used for separating suspended solids, the final-stage separation unit is used for separating organic matters and cleaning the inner wall, and when sewage enters the recycling barrel, the driving unit is used for controlling the primary separation unit to separate and recycle the greasy dirt and the precipitated impurities, and the chemical adding unit is used for recycling the suspended solids; organic matter separation and inner wall cleaning are carried out through the final-stage separation unit, and the influence on the separation and recovery efficiency is avoided.

The invention relates to the field of electroplating wastewater treatment, and discloses an electroplating wastewater treatment system and method.The electroplating wastewater treatment system comprises a plurality of pretreatment systems used for pretreating different types of electroplating wastewater; the at least three deep treatment systems are used for purifying the pretreated electroplating wastewater; wherein each advanced treatment system comprises a three-stage RO (Reverse Osmosis) system for primarily purifying the electroplating wastewater; the high-pressure RO system is used for concentrating the electroplating wastewater subjected to primary purification; the electrodialysis system is used for separating concentrated water generated by the high-pressure RO system; the common EDI system is used for improving the purity of the electroplating wastewater primarily purified by the three-stage RO system; meanwhile, concentrated water generated by the high-pressure RO system and the electrodialysis system enters an evaporator MVR to be subjected to evaporation treatment, and distilled water and concentrated residual liquid are obtained. According to the invention, high-efficiency water treatment, resource recycling and high-efficiency microorganism removal are realized, and the utilization rate of water resources and the quality of recycled water are remarkably improved.

The utility model relates to the technical field of sewage treatment, and provides a multistage capacitive deionization device for electroplating wastewater, which comprises a box body, a quick dismounting mechanism is arranged in the box body, and the quick dismounting mechanism comprises five groups of sliding strips which are in sliding connection with preformed grooves in the inner wall of the box body; a cation filtering layer, an anion filtering layer, a nickel ion adsorption layer, a medium filtering layer and an activated carbon filtering layer are fixedly connected to the side surfaces, close to each other, of each group of sliding strips respectively. By means of the technical scheme, the problem that in the prior art, by arranging the sliding strips, use can be conducted by changing the installation positions of all the laminates is solved, and by arranging the fixing frames, the fixing rods, the L-shaped clamping strips and the clamping blocks, rapid self-locking can be conducted after the laminates are installed, so that nickel ions can be rapidly treated after being adsorbed, and the service life of the nickel ions is prolonged. And each laminate can be conveniently cleaned and replaced, and the problem that the subsequent use effect is affected by much dirt adhered to the surfaces of the laminates is avoided.

The invention discloses a flocculent precipitation electroplating wastewater recovery device, which relates to the technical field of wastewater treatment, and comprises a wastewater treatment tank body, through the arrangement of the upper blocking plate and the lower blocking plate, floc floating is avoided, a flocculating agent needs to be added in the flocculation process to promote pollutants to form floc, if the floc floats and is discharged along with supernate, the flocculating agent is taken away along with the floc, the flocculating agent can fully play a role, the dosage of the flocculating agent is reduced, and the cost is reduced. In addition, when the floc can be effectively gathered and settled instead of floating and losing, the whole flocculation and sedimentation process can be completed more quickly, the influence on the wastewater treatment efficiency is avoided, in addition, the flocculation process aims at removing pollutants in water, and if the floc floats into supernate and is discharged, the wastewater treatment efficiency is improved. And part of pollutants cannot be thoroughly removed, so that the effluent quality is influenced, and residues of pollutants such as suspended matters, organic matters and heavy metals in water can be reduced.

The utility model provides a process system for recycling electroplating comprehensive wastewater, which relates to the technical field of wastewater treatment and is characterized in that a liquid inlet of a primary electrodeionization device is communicated with a primary wastewater treatment unit, and a fresh water outlet of the primary electrodeionization device is communicated with a secondary wastewater treatment unit; a concentrated water outlet of the first-stage electrodeionization device is communicated with the second-stage electrodeionization device; a fresh water outlet of the secondary electrodeionization device is communicated with the primary electrodeionization treatment device, and a concentrated water outlet of the secondary electrodeionization device is communicated with the solid-liquid separation device; a liquid outlet of the solid-liquid separation device is communicated with the evaporation device; the evaporation device comprises a condensed water outlet and a byproduct salt outlet, and the condensed water outlet is communicated with the secondary wastewater treatment unit; a produced water outlet of the secondary wastewater treatment unit is communicated with the produced water collecting tank; a waste liquid outlet of the second-stage wastewater treatment unit is communicated with a second-stage electrodeionization device, so that pollutants such as heavy metal ions and organic matters in wastewater can be removed, and cyclic utilization of water resources and recovery of salt resources are realized.

The invention discloses a multi-coupling electroplating wastewater treatment process, which relates to the technical field of electroplating wastewater treatment and comprises pretreatment, a chemical precipitation method, an ion exchange method, a reverse osmosis method, advanced treatment and sludge treatment. The device has the characteristics of reasonable and simple structure, low production cost and convenience in installation, various pollutants such as suspended particulate matters, heavy metal ions, trace organic matters and the like in the electroplating wastewater can be effectively removed through multiple process coupling, the water quality is ensured to reach the reuse standard, and the cyclic utilization of water resources is realized; according to characteristics of different heavy metal wastewater, the pH value is accurately adjusted, chemical precipitation, ion exchange and other processes are combined, the heavy metal removal efficiency is remarkably improved, and the treatment effect on wastewater containing copper and nickel is especially excellent; according to the filtering equipment, the movable separation base, the switching communication mechanism and the circulating filtering mechanism cooperatively operate, comprehensive filtering of wastewater can be achieved, impurities can be effectively collected through the suspension collecting mechanism, and the pretreatment effect is guaranteed.

The utility model discloses a flow guide device of an electroplating wastewater treatment and recycling device, which is applied to the field of wastewater treatment and is characterized in that a pull rod drives a slide rod to move by moving a pull block, the slide rod moves to drive a clamping head to move, so that the clamping head is separated from a clamping hole, then a flow guide plate is rotated to a required angle, and the pull block is loosened; a sliding rod drives a clamping head to be clamped with a clamping hole under the action of a first spring, the flow guide plate is fixed, and adjustment is completed, so that the purpose of conveniently adjusting the angle is achieved, the workload is reduced, the adjustment efficiency is improved, a motor rotates to drive a reciprocating lead screw to rotate to enable a guide block to reciprocate, and the guide block reciprocates to drive a sliding sleeve to reciprocate; the guide block reciprocates to drive the pressing mechanism to reciprocate, the pressing mechanism reciprocates to drive the brush to reciprocate, the brush reciprocates, and the surface of the filter screen is cleaned, so that the aim of preventing blockage can be achieved, and the filtering efficiency and the flow guide speed are ensured.

The invention relates to the technical field of wastewater treatment, and discloses an efficient electroplating wastewater treatment process which comprises the following steps: setting one or more bubble guide pipes by acquiring the volume of a reaction tank, and setting the bubble guide pipes by selecting the longest line section as a path according to the liquid level outline of wastewater, according to the invention, each bubble conduit is divided into one or more test areas, and different adjustment strategies are adopted for the corresponding number of bubble conduits by observing the bubble density of the test areas in real time to ensure that the bubble density in the reaction tank can reach the qualified standard, so that the wastewater treatment efficiency can be improved.

The present application discloses a method for treating and resourcefully recycling electroplating cyanide copper wastewater, belonging to the technical field of electroplating wastewater treatment. In this application, the cyanide copper wastewater is adjusted with strong base, and a ferrous sulfate solution is added to the cyanide copper wastewater after strong base adjustment for a combination reaction; the cyanide copper wastewater after the combination reaction is adjusted with acid and subjected to a Prussian blue reaction; a coagulant aid is added to the solution after the Prussian blue reaction, and solid-liquid filtration separation is carried out on it to obtain iron cyanide sludge and preliminarily precipitated cyanide-removing wastewater; the preliminarily precipitated cyanide-removing wastewater is adjusted with weak base, hydrogen peroxide is added to the preliminarily precipitated cyanide-removing wastewater after weak base adjustment, and the copper in the preliminarily precipitated cyanide-removing wastewater after weak base adjustment is used as a catalyst for an oxidation reaction to remove the remaining cyanide-containing pollutants; after the oxidation reaction is completed, lime is added for flocculation precipitation to obtain copper sludge, thus realizing a one-step process flow, converting copper cyanide compounds into resources that can be recycled, and improving the resource utilization rate.

The utility model discloses electroplating wastewater recycling application membrane treatment equipment which comprises a bracket, a precipitation device hermetically arranged on one side of the bracket, a filtering device arranged on the inner wall of the precipitation device, a connecting plate arranged on one side of the bracket, a lifting plate arranged on one side of the connecting plate, a clamping device arranged at one end of the lifting plate, and a sealing device arranged at the other end of the lifting plate, the sealing device comprises a sealing ring installed at one end of the lifting plate in a sealed mode, a sealing connecting ring is arranged on one side of the sealing ring and connected with the sealing ring through bolts, a filtering column is arranged on the inner wall of the sealing connecting ring in a sealed mode, a filtering groove is formed in the surface of the filtering column, and a filtering membrane is arranged on the surface of the filtering groove. Through mutual cooperation of the structures, the purpose of conveniently cleaning and maintaining the filtering membrane is achieved.

The invention discloses electroplating sewage treatment equipment and method, and relates to the technical field of sewage treatment. Comprising an equipment body, a medicament adding assembly and a cleaning assembly, the medicament adding assembly and the cleaning assembly are fixed to the outer wall of the equipment body, a screening assembly used for intercepting precipitates and an adsorption assembly used for pumping sewage are arranged in the equipment body, and the equipment body comprises a main box body; the agent adding assembly comprises a plurality of agent boxes fixed to the outer wall of the main box body, and adding pumps are fixedly connected to the tops of the agent boxes. According to the sewage treatment device, chemicals are added into the main box body in a small amount and multiple times according to a set sequence, so that the chemicals are fully diffused in sewage and fully react with the sewage, and precipitates generated in the reaction process can be continuously intercepted and screened out in the reciprocating lifting process of the lifting plate; the diffusion effect of the medicament in the sewage is better facilitated, the treatment capacity of the medicament is improved, and the influence of precipitates on the diffusion of the medicament is prevented.

The invention provides a composite extraction agent and a method for separating gold in electroplating wastewater by using the composite extraction agent, and belongs to the field of wastewater purification, the composite extraction agent comprises an extraction main agent and an extraction main agent stabilizer, the extraction main agent is a diallyl sulfide compound, and the extraction main agent stabilizer is dithiothreitol. The extraction main agent can form a stable complex with gold ions to enter an organic phase, and a nonlinear space structure of the extraction main agent can realize selective coordination with the gold ions, so that coordination reaction with other impurity metal ions is avoided; the sulfydryl in the dithiothreitol molecular structure has reducibility, so that the residual oxidant or dissolved oxygen in the solution can be prevented from oxidizing the extraction main agent, and the nonlinear polysulfide structure of the extraction main agent is kept. According to the method, the heterogeneous interface-coordination reaction of the activation sites in the molecular structure of the extracting agent and the gold ions in the inorganic phase is ensured by regulating and controlling the multi-component components of the composite extracting agent, efficient selective chelation of target metal is achieved, and the purpose of separating and enriching the gold ions in the gold-containing electroplating waste liquid is achieved.

The invention discloses an oil-water separation membrane for electroplating wastewater treatment and a preparation method, and particularly relates to the technical field of electroplating wastewater treatment.The specific preparation method comprises the following steps that firstly, a membrane base material is selected; step 2, pretreatment; step 3, coating or dipping the oil-resistant layer; step 4, drying and curing for the first time; 5, preparing a supporting layer; step 6, coating a functional layer; step 7, drying and curing for the second time; and step 8, post-processing. The whole preparation process is simple and easy to operate, firstly, the selected membrane base material is subjected to surfactant cleaning and acid-base treatment, impurities can be removed, the hydrophilicity of the membrane material can be improved, and the surface of the membrane material is gradually coated or impregnated with the oil-resistant layer and the multiple functional layers, so that the oil-resistant performance of the membrane material is improved. The comprehensive performance and operation stability of the membrane can be improved, and meanwhile, heat treatment and cross-linking treatment are carried out in post-treatment of the membrane material, so that the stability and pollution resistance of the membrane can be improved.

The invention belongs to the technical field of industrial wastewater purification, and discloses a membrane-free single-tank water electrolysis hydrogen production-electroplating wastewater enrichment coupling method and device, and the method comprises the following steps: injecting a neutral electroplating wastewater mixed solution into a membrane-free single tank; discharging air in the membrane-free single tank, and heating the neutral electroplating wastewater mixed solution to a preset temperature; direct current is firstly introduced into the heated neutral electroplating wastewater mixed solution, so that metal ions in the neutral electroplating wastewater mixed solution migrate to the hydrogen evolution electrode, then the direct current is converted into pulse current, so that the metal ions deposit on the hydrogen evolution electrode, and hydrogen precipitated on the hydrogen evolution electrode is continuously collected; closing the current, taking out the hydrogen evolution electrode and collecting metal ions on the hydrogen evolution electrode; and adding an oxygen evolution catalyst into the membrane-free single tank, starting the magnetic rotor to carry out oxygen evolution reaction, and taking out the oxygen evolution catalyst until bromate in the neutral electroplating wastewater mixed solution is completely reduced. According to the invention, the preparation of high-purity hydrogen and oxygen and the enrichment of metal ions can be realized.

The invention discloses a treatment and resource recycling method of electroplating cyanide copper wastewater, and belongs to the technical field of electroplating wastewater treatment. The method comprises the following steps: carrying out strong base regulation on the cyanogen copper wastewater, and putting a ferrous sulfate solution into the cyanogen copper wastewater subjected to strong base regulation to carry out binding reaction; adding acid to adjust the cyanide copper wastewater after the binding reaction, and carrying out Prussian blue reaction; adding a coagulation aid agent into the solution after the Prussian blue reaction, and carrying out solid-liquid filtration separation on the solution to obtain ferricyanide mud and preliminarily precipitated cyanogen-removed wastewater; carrying out weak base regulation on the preliminarily precipitated cyanogen-removed wastewater, adding hydrogen peroxide into the preliminarily precipitated cyanogen-removed wastewater subjected to weak base regulation, and carrying out oxidation reaction by using copper in the preliminarily precipitated cyanogen-removed wastewater subjected to weak base regulation as a catalyst so as to remove residual cyanogen-containing pollutants; and after the oxidation reaction is finished, lime is added for flocculent precipitation to obtain copper sludge, so that the copper cyanogen compound is converted into a recyclable resource through a one-time technological process, and the resource utilization rate is increased.

The invention discloses an electronic electroplating wastewater recycling and advanced treatment device and method, and particularly relates to the technical field of wastewater treatment.The electronic electroplating wastewater recycling and advanced treatment device comprises a treatment tank, a top cover is detachably installed at the top of the treatment tank, and the electronic electroplating wastewater recycling and advanced treatment device further comprises a separator arranged at the bottom in the treatment tank to complete electroplating wastewater isolation. By controlling the extrusion part to move up and down, the mixing mechanism can be synchronously triggered to work to complete stirring and mixing, stirring can be completed for electroplating wastewater at different liquid levels in the treatment tank, and meanwhile, four shielding mechanisms are exchanged during up-and-down movement of the extrusion part. The treatment agent can be fully released through vertical movement of the extrusion part, and the treatment agent is forced to be in contact with electroplating wastewater at different liquid levels in the treatment tank to complete full mixing, so that the purification efficiency is improved, meanwhile, the deep treatment precision can be controlled, the problem of unqualified treatment of the electroplating wastewater is avoided, and the treatment cost is reduced.

The invention discloses a method for preparing a sandwich type composite membrane capable of efficiently adsorbing heavy metal ions, and belongs to the field of water pollution treatment. The preparation method comprises the following steps: firstly, carrying out hydrolysis modification on polylactic acid particles, then dissolving the polylactic acid particles in dichloromethane / N, N-dimethylformamide to prepare an outer-layer spinning solution, and meanwhile, mixing polyvinyl alcohol, sodium alginate and polyethyleneimine to prepare an inner-layer spinning solution; performing electrostatic spinning on the outer-layer spinning solution to obtain an outer-layer film named as an outer-layer PLA film, performing electrostatic spinning on the inner-layer spinning solution to obtain an inner-layer film named as an inner-layer PVA / SA / PEI film, and re-spinning the outer-layer PLA film on the other side of the inner-layer PVA / SA / PEI film by using the outer-layer spinning solution, namely wrapping the inner-layer PVA / SA / PEI film with the two outer-layer PLA films to form a sandwich structure; and finally, obtaining the composite membrane by adopting a calcium ion cross-linking process. The composite membrane can efficiently adsorb metal ions, is high in adsorption performance retention rate and good in strong acid stability, and is suitable for selective iron removal of electroplating wastewater.

The invention discloses an electroplating wastewater recovery system and method, and belongs to the field of electroplating wastewater treatment.The electroplating wastewater recovery system comprises a resin adsorption device, a membrane concentration device, an electrolytic tank, a mixing tank, an immersed ultrafiltration membrane tank, electrodialysis equipment, reverse osmosis equipment and bipolar membrane electrodialysis equipment; a concentrated solution outlet of the membrane concentration device is communicated with the electrolytic tank, a dialysate outlet of the resin adsorption device, a permeate outlet of the membrane concentration device and a residual liquid outlet of the electrolytic tank are all communicated with the mixing tank, a water outlet of the mixing tank is communicated with the immersed ultrafiltration membrane tank, and a filtrate outlet of the immersed ultrafiltration membrane tank is communicated with the electrodialysis equipment. A desalted liquid outlet of the electrodialysis equipment is communicated with the reverse osmosis equipment, a concentrated liquid outlet of the electrodialysis equipment is communicated with the bipolar membrane electrodialysis equipment, and an alkali liquid outlet of the bipolar membrane electrodialysis equipment is communicated with the immersed ultrafiltration membrane pool. According to the method, not only are valuable metals obtained, but also acid liquor and alkali liquor are obtained.

The invention relates to the technical field of solid-liquid separation, in particular to an electroplating wastewater recovery device based on flocculent precipitation. Comprising a mounting frame, a settling tank, a water inlet pipe, a water outlet pipe, a baffle ring, a controller, filter cloth I, a lifting rod, a conical pressing block and the like, the settling tank is connected to the mounting frame, the water inlet pipe and the water outlet pipe are connected to the settling tank, the baffle ring is connected to the lower end of the settling tank, the controller is mounted on the mounting frame, and the filter cloth I is connected into the settling tank and located below the water outlet pipe; the conical pressing block is connected to the upper end of the lifting rod. Electroplating wastewater in the settling tank can be subjected to rapid solid-liquid separation by utilizing centrifugal force, and then sediments can be squeezed and discharged in batches by controlling the lifting rod and the conical pressing block to lift in a reciprocating manner, so that the sediments in the settling tank do not need to be regularly cleaned manually, the working efficiency is improved, and the labor intensity of workers is reduced. Moreover, the water content of precipitates can be reduced, the treatment effect is improved, and the cost is reduced.

The invention discloses an electroplating wastewater treatment device, and relates to the technical field of electroplating wastewater treatment, the electroplating wastewater treatment device comprises an upper box body, a primary filter tank and a dosing reaction mechanism, a partition plate is fixed in the middle of the upper box body, and the primary filter tank is arranged on one side of the upper box body. According to the electroplating wastewater treatment device and method, the chemical adding reaction mechanism is arranged to be linked with the adsorption assembly, electroplating wastewater produced industrially is filtered through the primary filter tank and fed into the rotary drum, and the rotary drum can drive the multiple adsorption fillers to alternately adsorb and remove most of organic matter and heavy metal ions in the wastewater when rotating; a chemical agent sprayed by a spraying pipe is oscillated and mixed with the electroplating wastewater, and then a spraying pipe of the chemical adding reaction mechanism rotates and swings to drive a spraying head to swing to spray the chemical agent to be mixed and contacted with electroplating mixed liquid, so that the electroplating wastewater reacts with the chemical agent step by step in the bottom box; it is ensured that the electroplating wastewater treatment device can fully treat harmful substances in the electroplating wastewater.

The utility model discloses a treating pond for electroplating wastewater, which is applied to the field of wastewater treatment and comprises a treating pond, and the surface of the treating pond is communicated with a water inlet pipe; the transmission mechanism drives the rotating pipe to rotate, so that the stirring pipe rotates to stir the electroplating wastewater, the heating pipe heats air, the air blower conveys hot air into the wastewater through the air spraying head, the temperature of the wastewater rises, the air enters the wastewater, flowing of reaction liquid can be promoted, mixing of chemicals and the electroplating wastewater is further accelerated, and the electroplating wastewater treatment efficiency is improved. The piston is driven by the air cylinder to move upwards, so that the air pressure in the fixed barrel is reduced, the medicament enters the fixed barrel through the liquid suction pipe, then the piston is driven by the air cylinder to move downwards, the medicament is discharged from the second one-way valve, and the air cylinder moves in a reciprocating manner, so that the reaction efficiency is improved; therefore, the purpose of quantitative dosing is achieved, dosing accuracy is guaranteed, and waste of chemicals is avoided.