161results about How to "Reduced risk of fouling" patented technology

The invention relates to a recycling treatment process for coal coking high-salinity wastewater. The process comprises the following steps: (1) fluorine removing; (2) silicon removing; (3) softening;(4) treatment with a multi-medium filter; (5) ultrafiltration; (6) resin softening; (7) FDG; (8) nanofiltration and salt separation; (9) reverse osmosis concentration; (10) advanced oxidation; (11) resin adsorption; and (12) evaporative crystallization. The process has the advantages that the process of pretreatment, nanofiltration salt separation, reverse osmosis concentration, advanced oxidationand evaporative crystallization is adopted, so that zero emission and quality-divided resource utilization of the coal coking high-salinity wastewater are realized.

The invention provides a resourceful treatment method for desulfuration wastewater. The resourceful treatment method comprises the following steps of (1), carrying out pretreatment on the desulfuration wastewater; (2), carrying out phosphate precipitation treatment on yielding water subjected to the pretreatment; (3), carrying out softening treatment on phosphate precipitated yielding water; (4), carrying out membrane separation treatment on softened yielding water, so as to obtain membrane separated produced water which is rich in monovalent ions and membrane separated thick water which is rich in bivalent and / or multivalent ions; (5), carrying out first advanced concentration treatment on the membrane separated produced water, so as to obtain first advanced concentrated produced water and first advanced concentrated thick water; (6), carrying out first evaporation and crystallization treatment on the first advanced concentrated thick water, so as to obtain a low-valent salt and evaporated liquor condensate; (7), carrying out second advanced concentration treatment on the membrane separated thick water, so as to obtain second advanced concentrated produced water and second advanced concentrated thick water; (8), carrying out second evaporation and crystallization treatment on the second advanced concentrated thick water, so as to obtain a high-valent salt and evaporated liquor condensate. The invention also provides a treatment system for implementing the method.

The invention discloses a method and device for achieving desulfurization wastewater zero discharging with full flue gas. The method includes the steps that desulfurization wastewater discharged froma coal-fired power plant slurry dewatering system is directly fed into a bypass bubble tower in front of a desulfurizing tower, and then is subjected to reducing concentration with hot flue gas in front of the desulfurizing tower; desulfurization wastewater concentrated water is fed into three connection tanks for charging treatment; settled supernatant liquid is fed into a wastewater tank to be buffered and stored; part of waste heat flue gas is led out behind an electrostatic dust collector and is further pressurized through a high-pressure fan to be fed into an inlet of a Venturi atomizingtube; the desulfurization wastewater stored in the wastewater tank is led into the Venturi tube through negative pressure at a pipe opening of the Venturi tube, high-speed airflow at the throat position of the Venturi tube can impact and atomize the led-in desulfurization wastewater, and meanwhile the waste heat flue gas and liquid drops are subjected to forceful heat transfer so that the pre-evaporation effect on the liquid drops can be achieved; and solid evaporated products are captured by the follow-up electrostatic dust collector or a bag-type dust remover, and therefore low-cost zero discharging of the desulfurization wastewater can be realized.

The invention provides a desulfurated waste water resourceful treatment method. The method includes the steps that desulfurated waste water is pretreated to remove suspended matter and / or colloid and heavy metal ions; 2, pretreated effluent obtained in the step 1 is subjected to phosphate precipitation; 3, phosphate precipitation effluent obtained in the step 2 is softened, wherein softening comprises the procedures of ion exchange and / or coagulation, and optionally, softening further comprises the procedures of acidification and / or filtration; 4, softened effluent obtained in the step 3 is subjected to membrane concentration; 5, membrane concentration concentrated water obtained in the step 4 is subjected to evaporation and concentration, and evaporation and concentration liquid and evaporation and condensation liquid are obtained; 6, the evaporation and concentration liquid obtained in the step 5 is subjected to crystallization salt separation, and crystallized salt, the evaporation and condensation liquid and crystallized mother liquor are obtained. The invention further provides a treatment system implementing the method.

A process for the preparation of a propylene random copolymer, wherein propylene is polymerised with ethylene and / or a C4-C20 alpha-olefin in the presence of a catalyst system comprising solid catalyst particles, wherein the solid catalyst particles (a) have a specific surface area of less than 20 m2 / g, (b) comprise a transition metal compound which is selected from one of the groups 4 to 10 of the periodic table or a compound of actinide or lanthanide,10 (c) comprise a metal compound which is selected from one of the groups 1 to 3 of the periodic table, and (d) comprise inclusions not having catalytically active sites.

The invention relates to a comprehensive treatment method of seawater or strong brine. The comprehensive treatment method comprises the following steps: pretreatment, low-interception nanofiltration separation, low-interception nanofiltration permeate liquid treatment, reverse osmosis concentrated water treatment, nanofiltration osmosis permeate liquid treatment and nanofiltration concentrated water treatment. According to the method, fresh water is completely recycled, the yield of low-value magnesium chloride and calcium sulfate (gypsum) byproducts is greatly reduced, low-value sodium sulfate, magnesium bromide and the like are prevented from being generated, and the yield of high-value products such as high-purity sodium chloride, calcium chloride, potassium sulfate and magnesium sulfate is remarkably increased.

The invention relates to a double-tank reversed-electrode electrodialysis water purification system and a table-board type water purifier thereof. The double-tank reversed-electrode electrodialysis water purification system is used for purifying water and provided with an original water tank, a concentrated water tank, an EDR unit capable of changing electrodes, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve. Pipelines of original water and concentrated water into the EDR unit are changed through the first electromagnetic valve and the second electromagnetic valve, and outflow pipelines of original water and concentrated water generated by the EDR unit are changed through the third electromagnetic valve and the fourth electromagnetic valve, so that the electrode reversing operation of the EDR unit is completed; the backflow of the concentrated water generated by the EDR unit can be achieved through a concentrated water pipeline of the system, so that the concentrated water is filtered again, and the pure waste ratio of produced water is improved; by utilizing the double-tank structure of the water purification system, the stability of the EDR reversed-electrode electrodialysis water purification system can be improved; and the scaling risk of the system can be reduced through the regular electrodereversing operation of the EDR reversed-electrode electrodialysis water purification system.

The invention provides a filler coupling coil evaporative condenser. The filler coupling coil evaporative condenser comprises a coil heat exchanger, a fan, a water pump and a water distributor. The coil heat exchanger is formed by connecting a plurality of heat exchange tube fins through inlet headers and outlet headers, each heat exchange tube fin comprises a coil and filler, and the coil is provided with at least one piece of filler for guiding spraying cooling water to flow from an upper-layer heat exchange tube to a lower-layer heat exchange pipe. The filler coupling coil evaporative condenser can reduce the temperature of the cooling water of the cooling coils, improve the coverage rate of water distribution of the cooling water of the cooling coils, improve heat exchange efficiency, prevent water flying, and reduce ventilation resistance; has the advantages of being large in heat transfer area and easy to clean; is wide in application range and good in market prospect.

The invention provides a water purification machine system and a control method for controlling the system. The water purification machine system comprises a raw water opening, a first filter element, a pure water outlet and a concentrated water outlet, wherein raw water enters from the raw water opening and flows through the first filter element so as to be divided into pure water and concentrated water; and the pure water can be discharged from the pure water outlet; the concentrated water outlet can be discharged from the concentrated water outlet. The water purification machine system also comprises concentrated water backflow branches which are suitable for causing the concentrated water to flow back to the upper part of the first filter element. The water purification machine system has the beneficial effects that the alternate change of water quality states on a membrane surface of the filter element is realized by adopting an intermittent backflow water production mode; the effective washing of the membrane surface of the filter element is realized; the scaling risk is reduced; wastewater discharge is reduced; and the recovery rate of the system is improved.

The invention discloses a zero emission system device for desulfurization wastewater evaporated by a drying tower after concentration. The zero emission system device comprises a pre-treatment unit, a membrane concentration unit and an air pre-heater bypass drying unit, wherein the pre-treatment unit is connected with the membrane concentration unit; the membrane concentration unit is connected with the air pre-heater bypass drying unit; the pre-treatment unit comprises an integrated high-efficiency sedimentation tank and a microfiltration device; the membrane concentration unit comprises a first-grade special middle-high pressure reverse osmosis membrane system and a second-grade seawater desalination reverse osmosis membrane concentration system; the air pre-heater bypass drying unit comprises a wastewater drying tower feeding box, a drying tower high-level water tank, a spray-drying tower, an air pre-heater and an SCR (Selective Catalytic Reduction) reactor. According to the device disclosed by the invention, a scheme of softening and concentration and evaporation of an air pre-heater bypass drying tower is adopted so that zero emission of the desulfurization wastewater is realized; produced fresh water is recycled and used as supplementing water of demineralized water of a boiler; evaporation is realized by adopting flue gas residual heat and an evaporation tower can be overhauled independently from a host system.

The invention relates to a water treatment system, in particular to a method and a system for concentrating high-salt mine well water, and belongs to the technical field of coal mine water treatment.The method comprises the following steps: firstly, pretreating the high-salt mine well water to remove oil, suspended matters and colloid pollution factors; allowing effluent to enter a first-stage reverse osmosis system; feeding concentrated water of the first-stage reverse osmosis system to a first-stage hardness and silicon removal system to be subjected to hardness and silicon removal treatment; allowing effluent to enter a second-stage reverse osmosis system; feeding second-stage reverse osmosis concentrated water to a second-stage hardness and silicon removal system to be subjected to hardness and silicon removal treatment, and feeding effluent to an ED membrane system. The first-stage reverse osmosis system and the second-stage reverse osmosis system are both fed into a recycling water tank. According to the method, the recovery rate of the concentration section can reach 98%, the TDS of concentrated water after concentration can reach 150 g / L-200 g / L, compared with a conventional concentration mode, the method reduces the subsequent evaporative crystallization scale by 1 / 2-3 / 4, and the method has the advantages of being low in investment and low in operation cost.

The invention relates to an integrated treatment method and device of titanium chloride dreg filtrate membrane and belongs to the chemical industry field of titanium white. The technology comprises the following steps: step 1: preparing titanium chloride dreg filtrate; step 2: regulating the pH (Potential of Hydrogen); step 3: carrying out primary reverse osmosis concentration; step 4: carrying out primary nano-filtration membrane impurity removal; step 5: carrying out secondary reverse osmosis concentration; step 6: carrying out secondary nano-filtration membrane impurity removal. The technology provided by the invention aims at concentrating and purifying sodium chloride saline water in the titanium chloride dreg filtrate; low-concentration sodium chloride saline water obtaining heavy metal ions is purified into high-concentration light saline water for a chlorine alkali industry through the technology of integrated membrane seperation, pH regulation, precipitation and sulfate radical removal, so that chlorination-process titanium chloride dreg is completely subjected to harmless treatment and zero emission of treatment of technological solid waste residues is realized; the technology has a remarkable environmental protection effect on a chlorination-process titanium chloride production process and resources in the waste residues can be also efficiently utilized; the technology has remarkable social and environmental benefits.

The invention provides a double-pipe heat exchanger used for a small molten-salt heat-storage system. The double-pipe heat exchanger used for the small molten-salt heat-storage system comprises a plurality of double-pipe heat exchanger passes, end sealing flanges, flange end covers, and connecting pieces through which the double-pipe heat exchanger passes are connected. Each double-pipe heat exchanger pass comprises a hollow inner heat exchanger tube (7) and a hollow outer heat exchanger tube (5), wherein the inner heat exchanger tube (7) is arranged in the outer heat exchanger tube (5) in a sleeved mode; the inner heat exchanger tube (7) is filled with a heat-exchange medium; the space between the outer heat exchanger tube (5) and the inner heat exchanger tube (7) is filled with a coolingmedium; the two ends of each outer heat exchanger tube (5) are fixed to the outer surface of the inner heat exchanger tube (7) through the corresponding end sealing flanges; and the flange end coversare arranged on the outer sides of the end sealing flanges. According to the double-pipe heat exchanger used for the small molten-salt heat-storage system, the problem that the flow rate of molten salt in part of molten-salt heat-storage systems is too low is specifically solved through the flexible configuration of the double-pipe heat exchanger, the heat transfer efficiency is effectively improved, and the scaling risk is lowered; and the number of the heat exchanger passes can be increased, so that flexible configuration is achieved, and the media can be completely discharged automatically.

The invention discloses a fluorine-containing wastewater treatment device and process for a liquid crystal display panel production plant, relates to the field of wastewater treatment, and mainly aimsto solve the problems of an existing fluorine-containing wastewater treatment process. Although the fluoride concentration of the treated concentrated water subjected to reverse osmosis treatment isabout 10mg / L which is as same as that of the existing process, the fluoride concentration in the reverse osmosis produced water is lower than 1mg / L, and the fluoride concentration in the final effluent can reach 5mg / L or below or meet a stricter discharge limit value after the reverse osmosis concentrated water subjected to fluorine removal treatment is mixed with all or part of the reverse osmosis produced water, that is, the effluent quality of the fluorine-containing wastewater treatment is superior to that of a conventional treatment process. According to the method, the fluoride concentration in the fluorine-containing wastewater can be reduced to below 5mg / L or meet a stricter emission limit value only by adopting a conventional fluorine removal agent, and the agent consumption is low although the same fluorine removal effect can also be achieved by adopting a special formula fluorine removal agent.

The invention relates to a resourceful treatment process of industrial high-concentration brine. The resourceful treatment process mainly comprises potassium sulfate solid preparation, sodium chloriderecovery and a water recovery technology. Firstly, sodium sulfate in the wastewater is converted into sodium chloride through an ion exchange resin device, then the sodium chloride is concentrated through a reverse osmosis membrane, permeate liquid can be reused in a production line, and trapped liquid is sodium chloride concentrated liquid and can be directly reused as desalted water; then the ion exchange resin is regenerated by using a potassium chloride solution, regenerated effluent is a high-concentration potassium sulfate solution and contains a small amount of potassium chloride, theregenerated effluent can be directly subjected to evaporative crystallization to obtain a potassium sulfate solid, and potassium chloride in crystallization mother liquor can be recycled as regenerated liquid. Compared with the prior art, the treatment process has the advantages that high-recovery-value potassium sulfate solids rather than sodium sulfate solids can be obtained while water and sodium chloride are recycled, resource recovery is achieved to the maximum extent in the whole process, and the treatment process is a sodium sulfate wastewater resource utilization technology with highereconomic benefits.

The invention provides an in-situ step enhanced combined purification system applicable to a slow flow type river. The in-situ step enhanced combined purification system is formed through the following steps: constructing a percolation dam for intercepting a water body step by step, reducing the flow velocity of the water body and promoting preliminary sedimentation of sediments, floating objectsand suspended matters in the water body; constructing a stabilization pond for settling large-particle-size suspended matters in the water body; constructing an ecological percolation island at the tail end of the stabilization pond, wherein the ecological percolation island is used for removing small-particle-size suspended matters in the water body; constructing a surface flow wetland for removing inflowing suspended matters in the water body, and increasing the transparency of the water body, wherein the percolation dam, the stabilization pond, the ecological percolation island and the surface flow wetland form a four-stage interception system; and constructing shoreside plant zones in areas at two sides of a riverway located at the tail end of the surface flow wetland, wherein the shoreside plant zones and the above four-stage interception system form the five-stage purification system. By constructing the four-stage interception system, the silting risk of the riverway is reduced,and the stability of the structure and the functions of a riverway ecological system is guaranteed; meanwhile, through the five-stage purification system, water is fully purified, the quality of water entering a river is guaranteed to reach the standard, and the purification function of the riverway is improved.

The invention relates to an evaporative condensation air-conditioning heat pump system which comprises a compressor, a four-way valve, a use-side heat exchanger, a finned tube heat exchanger, an evaporative condenser, a water sprinkling device, a liquid storage device, a drying filter, a throttling device, a vapor-liquid separator, fans, an electromagnetic valve D, an electromagnetic valve A, an electromagnetic valve B, non-return valves, a pipeline and a control loop, wherein the finned tube heat exchanger and the evaporative condenser are arranged at a condenser pipe end connection port of the four-way valve; the four-way valve switches the air suction and discharge directions of the compressor to achieve refrigeration and heating functions, and flow directions are further controlled by the electromagnetic valves and the non-return valves; and during heating, heat is absorbed from an air side by the finned tube heat exchanger. The evaporative condensation air-conditioning heat pump system has the beneficial effects of greatly improving the operation energy efficiency during refrigeration, having better energy efficiency, ensuring good quality of delivered product, being beautiful, occupying a small area, effectively reducing the construction cost, gaining a heating mode and enlarging the application range.

The invention discloses a preparation method of a superhydrophobic material as well as a product and application. The preparation method comprises the following steps: preparing hydrated silicon dioxide by adopting sodium silicate as a raw material; modifying the hydrated silicon dioxide; polymerizing the modified hydrated silicon dioxide, an EHP initiator and vinyl chloride to generate polyvinylchloride resin, mold pressing and molding the polyvinyl chloride resin to obtain the superhydrophobic material. The superhydrophobic material has superhydrophobic and scale self-cleaning effect, so that when the superhydrophobic material is applied to an industrial pipeline, the deposition of calcium sulfate scales on the inner wall of the pipeline can be prevented or reduced on the source, and the risk caused by the calcium sulfate scales can be greatly reduced.

The invention discloses a treatment method of carbonate-containing wastewater. The carbonate-containing wastewater passes through a regulating reservoir, a multi-medium filter, an ultrafiltration system, a reverse osmosis system, a primary resin softening system, a concentrated water reverse osmosis system, an advanced oxidation system, a tubular microfiltration system, a secondary resin softening system, a high-pressure reverse osmosis system, a sludge filter pressing system, an evaporation freezing crystallization system, an evaporation crystallization system, a wastewater treatment system, a recycling water tank and the like for process treatment to obtain sodium carbonate decahydrate product salt and by-products sodium sulfate and sodium chloride product salt. The treatment method has the advantages of strong anti-pollution capability, high concentration multiple, high recovery rate, high crystallized salt quality, high automation degree, low investment and low operation cost.

The invention relates to a device for chemical wastewater reverse osmosis advanced desalination treatment without adding scale inhibitor. A raw water tank is communicated with a nanofiltration membrane component through a pipeline; a nanofiltration water inlet pump and a nanofiltration water inlet control valve are arranged on the pipeline of the raw water tank and the nanofiltration membrane component; a water-producing pipeline which passes through the nanofiltration membrane component is connected with a reverse osmosis membrane component; a reverse osmosis membrane component is connected with a reverse osmosis water-producing tank through a pipeline; the nanofiltration membrane component is also connected with a nanofiltration high-salinity water drain tank through a nanofiltration high-salinity water drain valve; and the reverse osmosis membrane component is also connected with a reverse osmosis high-salinity water drain tank through a reverse osmosis high-salinity water drain valve. The nanofiltration pretreatment can effectively lighten the pressure of the reverse osmosis desalination, and prevent scaling on the surface of the reverse osmosis membrane; and the scale inhibitor is not needed in the operation process. The device for the chemical wastewater reverse osmosis advanced desalination treatment has the advantages of simple process and reliable operation, can change the loading capacity based on the water yield, and is particularly applied to the wastewater treatment needing the recovery of salts.

The invention discloses a spraying and scattering tower device. The spraying and scattering tower device comprises an exit pipeline, a defogger and a cylindrical tower body, wherein the interior of the cylindrical tower body comprises an upper bin, a spraying middle bin, an air bubbling lower bin and a bottom slurry tank; a bidirectional entry flue is arranged at the periphery of the spraying middle bin, and is internally provided with an ascending flue, a spraying pipe and a spray nozzle, and the primary desulfurizing is performed in the spraying middle bin; the air bubbling lower bin is provided with a plurality of scattering pipes; a lower separation baffle plate is arranged between the air bubbling lower bin and the spraying middle bin, is provided with openings corresponding to the ascending flue and the multiple scattering pipes, and is connected with the ascending flue and the multiple scattering pipes in a sealing way; a lower outlet of each scattering pipe extends into slurry,and a flow distribution perforated plate is arranged between each lower outlet and the liquid level of the slurry, and is connected with the corresponding scattering pipe in a sealing way, and secondary desulfurizing is performed above each flow distribution perforated plate. The spraying and scattering tower device has the advantage that by adopting the bidirectional flue inlet structure and designing the flow distribution perforated plate, the desulfurizing ability of the desulfurized slurry to the flue gas is enhanced under the cooperation function.

The invention relates to a novel low-temperature multi-effect seawater desalination evaporator in which multi-effect evaporators are arranged up and down. The top end of each evaporation chamber is provided with a water distribution device; a water inlet end of the water distribution device of the uppermost evaporation chamber can be or not be provided with a preheater; a heat exchange tube is arranged in each evaporation chamber; the front and back ends of each heat exchange tube are respectively provided with a tube plate; the outer side of each tube plate is provided with a freshwater tank; the lower side of each heat exchange tube is provided with a concentrated water tank; every two adjacent upper and lower freshwater tanks are connected through a J-shaped inter-effect freshwater connecting tube; the concentrated water tank on the upper layer is communicated with the upper side of the water distribution device of the evaporator on the lower layer through a J-shaped inter-effect freshwater connecting tube; and secondary vapor generated by the upper evaporation chamber enters the heat exchange tube of the lower evaporation chamber through inter-effect vapor connecting tubes positioned on two sides of the back side of an evaporator tube bank to be used as an evaporation heat source. The novel low-temperature multi-effect seawater desalination evaporator can enhance the seawater concentration ratio, does not need any inter-effect pump, lowers the energy consumption for seawater desalination, and ensures that influent water of the multi-effect evaporation chamber with higher evaporation temperature is raw seawater, thereby lowering the scaling risk.

A fuel pump, in particular a high-pressure fuel pump of a common-rail fuel system, has a pump piston guided in a pump cylinder, wherein, in an area of the pump cylinder within a gap guiding the pump piston, fuel for lubricating and for cooling when necessary is configured with an upper charge groove connected to a first pressure level through at least one charge hole and a lower discharge groove connected to a second pressure level through at least on discharge hole, wherein, a guide sheet for the pump piston is configured between an upper edge of the lower discharge groove and a lower edge of the upper charge groove, and wherein the charge holes leading to the upper charge groove or each charge hole and the lower edge of the upper charge groove adjacently feed into the upper charge groove.

The invention provides an anticorrosion S-shaped pipeline. The anticorrosion S-shaped pipeline includes a plurality of hollow structure pipe fittings connected in order, each pipe fitting comprises a bending part and fixed parts arranged at two end openings of the bending part, the fixed parts between adjacent pipe fittings are in bolted connection, seal parts are disposed between the fixed parts, and the inner walls of the pipe fittings are provided with an anticorrosion layer. The anticorrosion S-shaped pipeline provided by the invention is disposed at the front end of an oil pipeline to precipitate barium-strontium scale, greatly reduces the scaling and risk of the oil pipeline, prolongs the service life of the pipeline, also has the characteristics of simple structure and convenient use, and is suitable for oil transportation equipment in the field of chemical industry.

The invention provides a coal gasification wastewater zero-emission treatment method, a treatment system and an application thereof. The treatment system provided by the invention can respectively perform biochemical treatment, desalting and concentrated saline treatment on coal gasification wastewater through a biochemical treatment unit, a desalting unit and a concentrated saline treatment unit, clear water produced by each step can be reused, the produced high-salinity concentrated water can enter the next step for treatment, evaporation is finally performed through an evaporation unit, the clear water produced after evaporation can be used for water supply of a boiler, and the produced concentrated water can be used for flushing ash and slag. The treatment system provided by the invention can realize wastewater zero-emission treatment so as to achieve the purpose of saving water resources.

The invention provides a method and device for treating wastewater containing organic matters. The device comprises a wastewater pre-heater, an evaporator, a scaling device, a steam compressor and a condensed water collector. The invention further provides the method for treating the wastewater containing the organic matters by adopting the device. The method and device for treating the wastewater, provided by the invention, have the advantages of safety and reliability, simple equipment, low operation cost, obvious energy-saving effect and the like.

The invention discloses a DTRO guide disc generating vertical-and-horizontal turbulent flow. The DTRO guide disc comprises a disc body, wherein the two sides of the disc body are planes, multiple sunkconcave pits are distributed on the planes on the two sides of the disc body at intervals, and multiple protruding convex points are distributed at the portions, located between the adjacent concavepits, of the planes of the disc body. The DTRO guide disc generates horizontal turbulent flow, the mass transfer effect is enhanced, concentration polarization is reduced, and scale formation risk isreduced; meanwhile, raw water can fluctuate up and down, fluctuating force acts on a film bag, the film bag can generate chaotic small amplitude vibration, pollution and blocking matter with the largeviscidity can be thrown away through vibration, and with turbulent flow generated by the convex points, the pollution and blocking matter is taken away from a film column, it is avoided that as the surface of the film bag is covered with the pollution and blocking matter, the effective film area is decreased, and therefore it is avoided that as effective film area is decreased, the produced waterflow is reduced.

The invention provides a method and device for preparing a bactericide, the method comprising: 3 Add 5-6kg of sodium carbonate to the concentrated brine, react, precipitate and filter to obtain the first solution; add 3-3.5kg of sodium hydroxide to the first solution, react, precipitate and filter to obtain the second solution; Adding 8-9 kg of 33% hydrochloric acid into the second solution to adjust the pH value of the second solution; electrolyzing the second solution to generate sodium hypochlorite. In this way, by using the concentrated brine after decalcification and magnesium removal to carry out electrolysis to prepare sodium hypochlorite as a bactericide, the high temperature of the concentrated brine can effectively reduce power consumption; the high salt content (higher chloride ion concentration) of the concentrated brine can effectively Improve the efficiency of electrolysis; and, when the concentration of calcium and magnesium ions in the concentrated brine is reduced, it can effectively reduce the risk of fouling of the electrode plate in the electrolytic cell.

The invention discloses a filter core flushing protection system in a reverse osmosis water production system, which comprises a No. 1 check valve, a water bag, a backwash device, a No. 2 check valve, a reverse osmosis device, an RO reverse osmosis membrane and a waste water discharge valve. An RO reverse osmosis membrane is arranged in the internal working chamber of the reverse osmosis device, and the RO reverse osmosis membrane divides the internal working chamber of the reverse osmosis device into a clean water area and a concentrated water area that are independent of each other. The water outlet is connected to the water inlet of the backwashing device through a tee. The invention adopts the water bag to store purified water to realize micro-pressure backwash RO membrane flushing technology, discharges a small amount of concentrated water during the water production process, and rinses the RO membrane with the purified water stored in the water bag after the water production, which solves the problem of concentrated water remaining in the RO membrane The scaling problem in the water inlet channel can also dissolve the slight scaling generated during the water production process in time, reducing the scaling risk of the RO membrane, and greatly increasing the actual service life of the RO membrane while ensuring the water quality.

The invention belongs to the technical field of environmental protection, and particularly relates to a copper mine wastewater comprehensive treatment method. According to the method disclosed by theinvention, under the condition that the pH value is not adjusted, the high-COD alkaline wastewater is firstly treated in a centralized manner, so that the removal rate of COD reaches 80% or above. According to the method, the low-COD alkaline treatment water is used as a neutralizer to be mixed with the acid wastewater, so that high heavy metals in the acid wastewater are removed, the subsequent sludge treatment cost can be reduced, and the risk of pipeline scaling caused by CaSO4 can be reduced to prolong the treatment life of the whole treatment process. The method provided by the inventioncan effectively remove COD, SS and heavy metals, has the characteristics of high efficiency, strong impact load resistance, no secondary pollution, no need of additional nutrient source in the use process and the like, has the advantages of low investment and operation cost and simple operation, and can be suitable for treatment of copper mine wastewater.