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 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 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 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 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 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 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 present invention provides an immersion-type membrane separation apparatus and a membrane separation method capable of coping with a temporary increase in processing flow rate by utilizing the filtration capacity of a separation membrane, a constituent element of the apparatus. In the immersion type separation device, a membrane module is included, and the membrane module has a stacked membrane unit, and a flat sheet membrane element with a separation membrane is arranged in the membrane unit. The membrane unit with the highest filtration resistance or the highest pure water permeation resistance is placed in the membrane The lowermost section of the module, thus setting a high temporary filtration flux for the overall membrane module. This makes it possible to cope with short-term traffic increases.

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 a preparation method of a composite hollow fiber membrane. The preparation method 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 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 discloses a flexible anti-pollution ceramic membrane, which is prepared through a blending-compression molding method from 39%-55% of coupling agent-modified inorganic nanometer material, 40%-52% of elastomer material, 3%-8% of pore-forming agent and 2%-7% of cross-linking agent. By adding a hydrophilic elastic material into an inorganic raw material, the softening of ceramic membrane is achieved, the hydrophilic performance is greatly strengthened, and thus mechanical strength and anti-pollution performance of the membrane are improved. The process for preparing the flexible anti-pollution ceramic membrane is simple and easy to control, no high-temperature sintering is required, and the preparation cost is greatly 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.