53results about How to "Reduce frequency of chemical cleaning" patented technology

The invention belongs to waste water treatment equipment, especially relating to an improved aeration settling tank. The improved aeration settling tank comprises a tank body, a water inlet pipe arranged in front of the side wall of the tank body, a slope tilting downwards from end to beginning and arranged on the bottom of the tank body, an aerator arranged on the bottom of the tank, a water tank arranged at the inner side of a tank wall on the tail end of the tank body and inclined plates distributed at interval and in parallel in front of the water tank; the front side and the back side of the inclined plate are respectively provided with a first partition wall and a second partition wall; the first partition wall and the second partition wall divide the tank body into an aerobic zone, a pre-settling zone and a clean water zone which are arranged from front to back at interval; the pre-settling zone is communicated with the aerobic zone through water inlet holes and sludge returning holes arranged on the first partition wall; a perforated water collector pipe is arranged in parallel on the upper portion of the second partition wall; the inlet of the perforated water collector pipe is arranged in the pre-settling zone above the inclined plate, and the outlet thereof is arranged in the clean water zone; a sludge pipe is arranged on the bottom of the tail end of the clean water zone; the bottom of the water tank is communicated with the exterior of a water pipe. The improved aeration settling tank overcomes the technical defect that the degradation rate of pollutants is low in the prior art and has the advantages of good sludge settling effect, high degradation rate of the pollutants and so on.

The invention discloses bitter saline water desalination equipment, which comprises a raw water tank, and a high pressure pump, a reverse osmosis membrane component and a drinking water tank which are sequentially connected. The bitter saline water desalination equipment further comprises a physical-chemical program controlled composite coupling preprocessor consisting of a raw water pump, a laminated filter and a program controlled ultrafiltration device which are sequentially connected. The bitter saline water desalination equipment has the advantages that the process of physical-chemical program controlled composite coupling preprocessing filtration is adopted so that the raw water with different types and different qualities can be pretreated to meet the inlet water requirement for the reverse osmosis membrane component, thus the inlet water quality for the reverse osmosis desalination is improved, the rubber body pollution and the microorganism pollution to membrane elements in the reverse osmosis membrane component are prevented, the unit area permeation flux of the reverse osmosis membrane component is improved, and the protection of the reverse osmosis membrane elements is increased; at the same time, the chemical cleaning frequency of the reverse osmosis membrane elements is reduced, the service life of the membrane elements is prolonged, the operating cost is reduced, and the production efficiency is improved.

The invention relates to a reliable reverse osmosis high-recovery treatment method for recycling circulating water from a power plant. The method comprises the following steps: coagulating and clarifying the discharge water of the circulating water, adding an acid to adjust the pH value to 9.0-9.5, filtering with a variable-aperture filtering pool and a multi-medium filter, treating the filtered water with a two-stage sodium ion exchanger, adjusting the effluent to be alkaline, conveying to a reverse osmosis process, carrying out ultrafiltration on the reverse osmosis concentrated water part,and recycling as a solvent for regenerating the sodium ion exchanger. The treatment method provided by the invention has the beneficial effects of effectively reducing the reverse osmosis fouling risk caused by circulating water, prolonging the reverse osmosis operation period, reducing the chemical cleaning frequency, improving reverse osmosis operation stability, effectively improving the utilization rate of the circulating water, so that the maximum recovery of reverse osmosis can reach 95%, reasonably recycling part of the reverse osmosis concentrated water and saving a lot of water resources; and the reverse osmosis produced water can be directly used for heat network water replenishing and circulating water replenishing of the power plant. The method plays a good promotion role in solving the short water supply of the power plant, improving recycling utilization rate of the circulating water and the like, and is also suitable for chemical industry, petroleum, steel and other fields utilizing the discharge water of the circulating water as production water.

The present invention relates to a body-separated tubular dynamic membrane biological reactor. It mainly is formed from biological unit, aeration system, membrane unit, suction system and automatic control system. Said invention also provides the working principle of said biological reactor.

The invention relates to the field of waste water treatment, in particular to a vehicular emergency drinking water purifying station. The purifying station is composed of a pre-treating unit, an integrated membrane treating unit, a sterilization and disinfection unit and a water source outward transporting unit; and the four units are orderly connected by pipelines and mounted in a vehicular box body. The vehicular emergency drinking water purifying station is low in requirements on raw water quality and simple in treatment process.

The invention discloses a combined technology for treatment and recycle of production sewage. The combined technology for treatment and recycle of production sewage comprises sewage pretreatment, sewage depth treatment and sewage desalination treatment. A process flow of the combined technology comprises that sewage is orderly treated by a grille, a sewage adjustment tank, an air floatation tank, a sedimentation tank, a fiber filtration unit, a sand filtration water inlet station, a sand filtration device, a water collecting tank, an ultrafiltration elevator pump, a self-cleaning filter, an ultrafiltration device, an intermediate water tank, a reverse osmosis elevator pump, a clear water tank, a reuse water elevator pump and a reuse water tank. The combined technology utilizes steel enterprise production sewage as a water source and mainly adopts an air floatation tank-sedimentation tank-fiber filtration unit-sand filtration device-ultrafiltration device combined way before a reverse osmosis desalination process. The combined technology can effectively remove oil pollutants, organic matter pollutants, colloid pollutants and suspension pollutants in sewage, improve reverse osmosis feed water quality, reduce chemical cleaning frequency of a reverse osmosis membrane, increase a service life of the reverse osmosis membrane, and reduce an operation cost.

The invention discloses a preparation method of porous nano antibacterial particles and a composite nanofiltration membrane and the composite nanofiltration membrane. The preparation method of the porous nano-antibacterial particle composite nanofiltration membrane comprises the following steps: 1, adding porous copper-coated TiO2 nano-antibacterial particles into a basic solution, and uniformly embedding the porous nano-antibacterial particles into the basic solution through ultrasonic dispersion or strong stirring to prepare a monomer solution; wherein the basic solution is a polybasic acylchloride solution and a piperazine aqueous solution, or a polybasic acyl chloride solution and an aqueous solution of a mixture of piperazine and polyamine; and 2, carrying out interfacial polymerization reaction on the monomer solution on the surface of an ultrafiltration support membrane layer to obtain the porous copper-coated TiO2 nano antibacterial particle composite nanofiltration membrane.The prepared porous copper-coated titanium dioxide nano antibacterial particle composite nanofiltration membrane is large in water flux, high in desalination rate, resistant to bacterial pollution, easy to clean and capable of being widely applied to the application fields of sewage treatment, material concentration, decoloration, desalination of alkaline water or seawater and the like.

The invention provides an energy-saving and pollution-resisting water treatment system provided with RO (reverse osmosis) membranes. The energy-saving and pollution-resisting water treatment system comprises a raw water tank, a main raw water pipeline, a main produced water pipeline, a main concentrate water pipeline and a plurality of RO membrane elements connected in parallel, wherein produced water of the RO membrane elements converges at the main produced water pipeline, concentrate water of the RO membrane elements converges at the main concentrate water pipeline, a system water inlet valve 1 is arranged on each branch raw mater pipeline, and a concentrate water reflux valve 2 and a concentrate water control valve 3 are arranged on each branch concentrate water pipeline; and the water treatment system further comprises compressed air pipelines converged with the branch raw water pipelines. The water treatment system adopts a mode of total parallel connection of single membrane elements, and the operation energy consumption is lower; and the operation mode of intermittent water production and intermittent air-water joint flushing is adopted, and the recovery rate of the system can reach 80%-90%.

The invention discloses a preparation method of a macromolecular compound membrane, and particularly relates to an antipollution modifying method of a compound reverse osmosis membrane. The antipollution modifying method comprises the following steps: (1), dissolving acid in water, adding a defined amount of chitosan and surfactant, stirring until the chitosan and the surfactant are fully dissolved to obtain a solution A; (2), dissolving an alkaline substance in water, and stirring and dissolving to obtain a solution B; and (3), coating the surface of a polyamide compound reverse osmosis membrane by the solution A, enabling the membrane to be in contact with the solution B after redundant solution A on the surface of the membrane is removed to complete the antipollution modification of the compound reverse osmosis membrane. The antipollution modifying method has the advantages that two hydrophilic groups -NH2 and -OH are carried on the surface of the membrane modified by using the antipollution modifying method, so that good hydrophilic performance and antipollution performance are achieved; and meanwhile, the chitosan is dissolved in an acidic solution without being heated, thus the antipollution modifying method is easy to operate. Therefore, the antipollution modifying method has a remarkable competitive advantage on membrane modifying operation and production cost.

The invention provides a refining and chemical sewage desalting integrated treatment process and device. The process comprises the steps of adding CaO and Na2CO3 into refining and chemical sewage subjected to primary treatment to remove hardness, and regulating the pH value by using acid to obtain primary hardness removed sewage; filtering the primary hardness removed sewage by using a plurality of media and activated carbon to obtain pretreated sewage; carrying out ultrafiltration after mixing the pretreated sewage and sodium hypochlorite to obtain ultra-filtered sewage and filtered matters; carrying out ion exchange treatment after mixing the ultra-filtered sewage and a reducing agent to obtain deionized sewage; carrying out reverse osmosis treatment after mixing the deionized sewage and a scale inhibitor to obtain pure water and concentrated reverse osmosis water. The process also comprises the step of carrying out regeneration treatment on an ion exchange material for ion exchange treatment after removing concentrated organic matters in the concentrated reverse osmosis water through hydrogen peroxide and activated carbon oxidation treatment. The refining and chemical sewage desalting integrated treatment process can be used for increasing the comprehensive water yield and desalting rate of refining and chemical sewage desalting treatment, effectively controlling membrane pollution and realizing the recycle of the refining and chemical sewage.

The invention discloses a textile wastewater treatment method and device. The treatment device comprises an A / O (Anoxic / Aerobic) biochemical treatment unit, an MBR (Membrane Bioreactor) membrane treatment unit and an MBR advanced concentrated solution treatment unit, wherein the top of a biochemical precipitation tank is communicated with an MBR reaction tank through a pipeline, the bottom of the MBR reaction tank is connected with the MBR advanced concentrated solution treatment unit, The MBR membrane treatment unit is communicated with the A / O biochemical treatment unit through a sludge reflux pipe, and the MBR advanced concentrated solution treatment unit is communicated with the A / O biochemical treatment unit through a wastewater reflux pipe. The textile wastewater flows into the biochemical precipitation tank after being subjected to the A / O biochemical treatment, effluent from the biochemical treatment unit enters the MBR reaction tank, and production water is subjected to suction, so that the production water is discharged to an outlet after meeting standards; and the textile wastewater containing a part of refractory substances enter an MBR mud-water separation and precipitation tank to perform mud-water separation, and after the COD (Chemical Oxygen Demand) in the mud-water separation and precipitation tank reaches a preset value, the effluent in the mud-water separation and precipitation tank is discharged and subjected to the advanced treatment.

The invention provides a folded plate membrane assembly for retarding membrane pollution in a membrane bioreactor, belonging to the technical field of environment engineering. The folded plate membrane assembly comprises a hollow folded-plate-shaped organic glass framework and a filter membrane, wherein the filter membrane covers two sides of the folded-plate-shaped organic glass framework to form the folded plate membrane assembly; the folded plate membrane assembly at least has two waveforms; a plurality of water collection galleries connected with the hollow interior of the framework are arranged on the side surface of the folded-plate-shaped organic glass framework, and an annular water outlet is formed in the upper end of the folded-plate-shaped organic glass framework. By applying the folded plate membrane assembly to a membrane bioreactor process, the cross current velocity of a membrane surface-near fluid can be improved, the turbulent disturbance effect of the membrane surface-near fluid can be enhanced, the deposition of particulate matters on the membrane surface is beneficially reduced, and the membrane pollution is effectively retarded. The folded plate membrane assembly has the beneficial effects that the antifouling property of the membrane assembly can be improved without increasing the energy consumption, the service life of the membrane assembly is prolonged, the cleaning frequency of the membrane assembly is reduced, the operation cost of the membrane bioreactor process is substantially lowered, and the wide application of the membrane bioreactor is promoted.

The invention relates to a preparation method of a composite hollow fiber membrane. The preparation method is characterized by comprising the following steps: preparing a casting membrane solution; preparing a core solution and an external gel bath; spinning hollow fibers: injecting the core solution and the casting membrane solution into spinning nozzles together by utilizing dry-wet spinning equipment and extruding the core solution and the casting membrane solution from the spinning nozzles together to prepare hollow fiber membrane silk; and after the hollow fiber membrane silk obtained in the above step passes through a 0-35cm dry spinning path, enabling the hollow fiber membrane silk to enter a first gel bath and a second gel bath to undergo gel phase conversion, thus forming the polymer hollow fiber porous membrane with microchannels. The composite hollow fiber membrane prepared by the method is a hydrophilic hollow membrane material, has higher membrane flux under low pressure, has good pollution resistance and also has better mechanical strength due to the complementarity of the raw materials.

The invention provides an external component anaerobic membrane bioreactor and a waste water purification process thereof. The waste water purification process includes that a mixed liquid in an anaerobic tank is pumped into a ceramic internal pressure pipe type ultrafiltration membrane through a pump for a cross flow filtration, the mixed liquid contains anaerobic bacteria and diatomaceous earth, under the action of pressure difference, clear water is permeated outwards through the ceramic internal pressure pipe type ultrafiltration membrane and is led out, and a concentration mixed liquid reserved in the ceramic internal pressure pipe type ultrafiltration membrane is taken back to the anaerobic tank through a cross flow. Compared with anaerobic membrane bioreactors in prior art, the external component anaerobic membrane bioreactor has the advantages that during operating, a certain amount of the diatomaceous earth is added into the mixed liquid, consequently the scouring and washing effects on the inner wall of the ceramic internal pressure pipe type ultrafiltration membrane can be strengthened, deposition and pollution of impurities to the inner wall of the ceramic internal pressure pipe type ultrafiltration membrane can be effectively reduced, the permeation flux is stabilized, simultaneously the cross flow speed can be reduced, the energy consumption is lowered, the filtering period of the ceramic internal pressure pipe type ultrafiltration membrane is prolonged, and the chemical cleaning frequency is reduced.

The invention provides a method for extracting and purifying sugar alcohol with high purity and high yield, which comprises the following steps of: performing partial purification on the sugar alcohol in a raw material solution through a microfiltration-ultrafiltration-nanofiltration process, and removing protein impurities in the raw material solution by using an ultrafiltration membrane to achieve the effects of improving the nanofiltration concentration multiple, reducing the chemical cleaning frequency and improving the purity of the sugar alcohol; guiding concentrated water of the first-section micro-filtration membrane device and concentrated water of the first-section nano-filtration membrane device into a second-section micro-filtration membrane device and a second-section nano-filtration membrane device respectively again to conduct circulating concentration on feed liquid, and guiding concentrated water of the second-section nano-filtration membrane device into a third-section nano-filtration membrane device to conduct concentration again; enabling the produced water of the reverse osmosis membrane device to flow back to the inlet water of the second-section micro-filtration membrane device and the third-section nano-filtration membrane device, so that the concentrated water of the first-section micro-filtration membrane device and the concentrated water of the second-section nano-filtration membrane device are diluted, and the produced water of the second-section micro-filtration membrane device is used for diluting the concentrated water of the first-section nano-filtration membrane device, and therefore, the transmittance of sugar alcohol in the concentration process is further increased, the concentration load of two-section nanofiltration and three-section nanofiltration is reduced, meanwhile, the resource consumption is greatly reduced, and a complete internal circulation is formed; the method provided by the invention provides an efficient non-batch switching operation process for the purification of sugar alcohol, and maximizes the stability and continuity of a process line under the condition of further improving the product yield and purity.

The invention discloses a method for monitoring and preventing biological pollution and colloid pollution of a reverse osmosis membrane, which comprises the following steps: a pollutant gathering device is arranged before a reverse osmosis membrane reactor; the flowing situation of the roll-type reverse osmosis membrane system is simulated; and when the reverse osmosis membrane is polluted by colloid particulate matters and organism, the pollutant gathering device can be used for replacing the reverse osmosis membrane to load the pollution on a water inlet end membrane element of the regular reverse osmosis membrane, and the water inlet / outlet pressure difference and the pollution situation can be monitored on line at high precision. A core part of an intermediate device is a cylindrical filler element made of an inert material, and can be used for various strong online chemical cleaning, and quickly recovered when being plugged by the pollutants.

The invention relates to a composite hollow fiber membrane. The composite hollow fiber membrane is characterized by comprising the following steps: preparing a membrane casting solution; preparing a core solution and an outer gel bath; utilizing a dry-wet spinning device to inject the core solution and the membrane casting solution into a spinneret together for hollow fiber spinning, and extruding from the spinneret together to prepare a hollow fiber membrane wire; and enabling the hollow fiber membrane wire obtained in the step to pass a dry spinning path of 0-35cm and sequentially enter a first gel bath and a second gel bath for gel phase inversion to form the high polymer hollow fiber porous membrane with a microprous pore canal. The composite hollow fiber membrane prepared by the method disclosed by the invention is a hydrophilic hollow membrane material and has higher membrane flux and good pollution resistance at low pressure; simultaneously, the hollow fiber membrane has better mechanical strength due to the complementary property of the raw materials.

The invention discloses an organic polymer synthetic membrane based on antimony tailings and a preparation method thereof. The organic polymer synthetic membrane is prepared from the following components in percentage by mass: 70%-80% of an organic solvent, 10%-15% of an adhesive, 4%-5% of an anti-freezing material, 4%-5% of a surfactant, 1%-7% of antimony tailings leached by a leaching agent and1% of a pore-foaming agent. The organic polymer synthetic membrane based on the antimony tailings is soft in texture, uniform in crystal lattice distribution, high in mechanical performance and not prone to damage; moreover, the synthetic membrane is high in hydrophilic performance, resistant to corrosion and high temperature, good in permeability and high in anti-pollution capacity, the preparation process of the synthetic membrane is simple, high-temperature sintering is not needed, and the preparation cost is greatly reduced.

The invention relates to a preparation method of a composite hollow fiber membrane. The preparation method is characterized by comprising the following steps: preparing a casting membrane solution; preparing a core solution and an external gel bath; spinning hollow fibers: injecting the core solution and the casting membrane solution into spinning nozzles together by utilizing dry-wet spinning equipment and extruding the core solution and the casting membrane solution from the spinning nozzles together to prepare hollow fiber membrane silk; and after the hollow fiber membrane silk obtained in the above step passes through a 0-35cm dry spinning path, enabling the hollow fiber membrane silk to enter a first gel bath and a second gel bath to undergo gel phase conversion, thus forming the polymer hollow fiber porous membrane with microchannels. The composite hollow fiber membrane prepared by the method is a hydrophilic hollow membrane material, has higher membrane flux under low pressure, has good pollution resistance and also has better mechanical strength due to the complementarity of the raw materials.

The invention discloses preparation methods for porous nano antibacterial particles and a composite hollow membrane and the composite hollow membrane. The preparation method for the porous nano antibacterial particles comprises the steps: adding titanium tetrachloride into water, adding ammonium sulfate and concentrated hydrochloric acid, carrying out stirring, then, carrying out heating-up and heat preserving, and adding stronger ammonia water for cooling; adding beta-cyclodextrin, and carrying out stirring, so as to obtain glue; subjecting the glue to a hydrothermal reaction, so as to obtaintitanium dioxide nanoparticle sol; adding CuCl2 and sodium dodecylbenzene sulfonate into the particle sol, carrying out stirring, then, adding a reducer and pure water, and carrying out mixing, so asto obtain a reactant; subjecting the reactant to a light induced reaction, so as to prepare copper-coated titanium dioxide nanoparticles; and washing the copper-coated particles, carrying out baking,and then, carrying out calcination, thereby preparing the porous copper-coated titanium dioxide nano antibacterial particles. The composite hollow-fiber filter membrane prepared by using the particles is high in water flux, high in porosity, resistant to bacterial contamination and easy to clean and can be extensively applied to the fields of sewage and water treatment, material concentrating, pretreatment of brackish water and seawater desalinization, and the like.

The invention discloses a system and method for treating sewage containing salt. The system comprises a pretreating unit, a pre-concentrating unit, an evaporating unit, a crystallizing unit, a condensate fine treating unit and a solid ingredient treating and recycling unit. When pretreating is carried out, the sewage which is to be treated and contains salt is introduced, and waste water and sludge are generated after treatment; pure water and concentrated water are generated in the pre-concentrating process; condensate and strong brine are generated in the evaporating process; condensate and crystallized salt are generated in the crystallizing process, the pure water and the condensate are subjected to a condensate fine treating process, and the sludge and crystallized salt are subjected to a solid ingredient treating and recycling process; recycling water is generated in the condensate fine treating process. By means of the system, customized process selection can be carried out according to different demands, swage discharge to an adjacent water body can be completely eliminated, moisture can be recycled to the maximum degree, high-purity softened water can be obtained to the maximum degree, energy consumption is low, and resource recycling of the salt can be achieved.

The invention provides a pretreating method of controlling algae pollution of ultra filtration membrane by potassium permanganate and chlorine, simultaneously casting two oxidants of potassium permanganate and chlorine into the algae containing water of a reservoir in 0.3-2mg / l and 0.2-3mg / l, respectively, quickly mixing and making flocculation reaction for 5-20 min, pumping supernatant into the ultra filtration membrane, and obtaining drinking water by alternating flow filtration of membrane component. And it improves algae removing effect by adsorption and codeposition, thus reducing algae quantity entering the ultra filtration membrane and effectively controlling algae pollution of ultra filtration membrane. And it can control frequency of chemically cleaning ultra filtration membrane and effectively prolong the service life of ultra filtration membrane.

The invention provides an external component anaerobic membrane bioreactor and a waste water purification process thereof. The waste water purification process includes that a mixed liquid in an anaerobic tank is pumped into a ceramic internal pressure pipe type ultrafiltration membrane through a pump for a cross flow filtration, the mixed liquid contains anaerobic bacteria and diatomaceous earth, under the action of pressure difference, clear water is permeated outwards through the ceramic internal pressure pipe type ultrafiltration membrane and is led out, and a concentration mixed liquid reserved in the ceramic internal pressure pipe type ultrafiltration membrane is taken back to the anaerobic tank through a cross flow. Compared with anaerobic membrane bioreactors in prior art, the external component anaerobic membrane bioreactor has the advantages that during operating, a certain amount of the diatomaceous earth is added into the mixed liquid, consequently the scouring and washing effects on the inner wall of the ceramic internal pressure pipe type ultrafiltration membrane can be strengthened, deposition and pollution of impurities to the inner wall of the ceramic internal pressure pipe type ultrafiltration membrane can be effectively reduced, the permeation flux is stabilized, simultaneously the cross flow speed can be reduced, the energy consumption is lowered, the filtering period of the ceramic internal pressure pipe type ultrafiltration membrane is prolonged, and the chemical cleaning frequency is reduced.

The invention relates to an aeration and low frequency ultrasonic wave reinforced film coagulation reaction separating device and a method for producing drinking water thereby, belonging to the field of drinking water treatment. The invention solves the problems that split coagulation-ultrafiltration technique occupies large land, forms uneven floccule and causes severe film pollution. A groove is arranged at the bottom of a shell of the separating device, the bottom of the groove is provided with a first aerator, and the upper part of the shell is provided with an ultrasonic metal plate, a second aerator and an ultrafiltration film component. The source water is treated by aeration coagulation, ultrasonic cavitation and ultrafiltration film filtration of the separating device, so that the drinking water can be obtained. The water quality of the water treated by the device reaches the national drinking water standards GB5749-2006. The method reduces the film pollution, prolongs the service life of a film and obtains even floccule. The invention has small land occupying area and simple structure, is applicable to building and field water supply of a small country water supply device, temporary water supply of emergency as well as reconstruction and extension of municipal water plants, and has higher popularization value.

The invention relates to an aeration and low frequency ultrasonic wave reinforced film coagulation reaction separating device and a method for producing drinking water thereby, belonging to the field of drinking water treatment. The invention solves the problems that split coagulation-ultrafiltration technique occupies large land, forms uneven floccule and causes severe film pollution. A groove is arranged at the bottom of a shell of the separating device, the bottom of the groove is provided with a first aerator, and the upper part of the shell is provided with an ultrasonic metal plate, a second aerator and an ultrafiltration film component. The source water is treated by aeration coagulation, ultrasonic cavitation and ultrafiltration film filtration of the separating device, so that the drinking water can be obtained. The water quality of the water treated by the device reaches the national drinking water standards GB5749-2006. The method reduces the film pollution, prolongs the service life of a film and obtains even floccule. The invention has small land occupying area and simple structure, is applicable to building and field water supply of a small country water supply device, temporary water supply of emergency as well as reconstruction and extension of municipal water plants, and has higher popularization value.