81results about How to "Restore flux" patented technology

The invention relates to an immersed type on-line cleaning method and device for a slab ceramic membrane. The invention aims to provide the method which can be used for cleaning the slab ceramic membrane in an in-situ or online manner without separating the ceramic membrane and a reactor, and the method has the characteristics of high membrane flux recovery speed, low energy consumption, high cleaning efficiency, low operation cost and automatic control. The provided device has the characteristics of simple structure and convenience in use. According to the technical scheme, the immersed type on-line cleaning process for the slab ceramic membrane comprises the following steps in sequence: (1) turning on on-line cleaning; (2) back-flushing a liquid phase; (3) back-flushing gas and liquid in a combined manner; and (4) finishing the on-line cleaning. The immersed type online cleaning device for the slab ceramic membrane comprises an aeration pipeline and a control system, wherein the on-line cleaning device further comprises a liquid-phase back-flushing system; the liquid-phase back-flushing system is assorted with a back-flushing pump and is communicated with the aeration pipeline through a pipeline; a cleaning agent preparation device is communicated with the liquid-phase back-flushing system through a pipeline.

The invention relates to a reuse treatment method for industrial wastewater from a refrigerator compressor factory. Firstly, independently collected emulsified bath solution wastewater is acidified and demulsified, free oil and emulsified oil in the wastewater are eliminated, and then the wastewater is subjected to Fe<2+>/H2O2 oxidation, the effluent pH is 7-8, and then coagulant aid is added forcoagulation sedimentation, and organic matter, metal salt and SS are removed, so that emulsified bath solution water is obtained. Subsequently, the emulsified bath solution water and the independently collected rinsing wastewater are uniformly mixed according to the ratio of 1:20-30 to serve as the source water for micro filter membrane treatment; the source water is subjected to air floatation oil separation dephosphorization, coagulation and activated carbon adsorption to obtain water with the pH value of 9-10 under micro filtration, and then the water under micro filtration enters the micro filter membrane, so clean water is obtained; and the clean water and tap water are mixed according to the ratio of 1:1-2, are subjected to filtering by activated carbon and 5um precise filtration and enter a reverse osmosis membrane, and then pure water is obtained after desalination, and the pure water can be reused for production. With the reuse treatment method, the water quality of reused water is stable and can reach the standard of pure water used by enterprises for production, the water is reused for a product line, so that the wastewater discharge of the enterprises is greatly reduced, the use volume of tap water is saved, and remarkable economical and social benefits are achieved.

The invention provides a preparation method of a cheap ultra-filtration membrane for treating oil producing wastewater. The preparation method comprises the following steps: dissolving nano silicon dioxide into a polyvinyl chloride dissolving solvent under ultrasonic condition to prepare a suspension solution of nano particles; then sequentially and slowly adding a pore-forming agent, a de-foaming agent and polyvinyl chloride into the suspension solution; continuously and mechanically agitating in a water bath of 30-40 DEG C for more than 24 hours until a homogeneous membrane casting solution is formed; sufficiently de-foaming the membrane casting solution in a vacuum drying box and scraping a membrane by using a membrane scraping machine; after volatilizing the scraped new membrane in the air for 15-60 seconds, slowly putting the scraped new membrane into a coagulating bath for coagulation; and after separating the membrane from a glass plate, sufficiently immersing the membrane in pure water for 48 hours to obtain a nano silicon dioxide modified polyvinyl chloride flat plate membrane. The preparation method of the cheap ultra-filtration membrane can be used for nano silicon dioxide polyvinyl chloride hollow fiber type ultra-filtration membranes and micro-filtration membranes, reverse osmosis membranes, nano-filtration membranes, pipe type membranes, capillary tube membranes or spiral-wound membranes.

A flocculating method for preventing pollution to membrane of membrane bioreactor and maintaining the membrane throughput includes adding iron salt solution to membrane bioreactor, stirring or aerating for providing turbulence while reaction to generate flocculate, and discharging sludge. Its advantages are high effect etc.

The invention provides a preparation method of a forward osmosis membrane modified with oxidized graphene. The preparation method comprises the following steps: 1, firstly, conducting ultrasonic dispersion on the oxidized graphene in high-polarity organic solvent, so that homogeneous dispersion liquid is obtained; 2, adding organic solvent of raw materials of a produced membrane to the dispersion liquid; 3, sequentially adding additives and the produced membrane to the dispersion liquid obtained in step 2, and stirring the mixture till the mixture is dissolved completely, so that casting membrane liquid is obtained; 4, conducting sufficient defoaming on the casting membrane liquid in a vacuum drying box, then pouring the casting membrane liquid on a glass plate where a support layer is laid, and conducting membrane scraping; 5, after membrane pouring is ended and the casting membrane liquid is volatilized in air, putting the casting membrane liquid in a coagulation bath; 6, separating a membrane piece with the glass plate, and putting the membrane piece into pure water for immersion; 7, conducting natural drying on the membrane which is sufficiently immersed as mentioned above, so that the forward osmosis membrane is obtained. The modified forward osmosis membrane prepared through the preparation method is good in hydrophilicity and water flux and great in antipollution capability, cleaning expense of the membrane is lowered, the service life of the membrane is greatly prolonged, and mechanical properties are improved a lot.

The invention relates to a preparation device for water-soluble nanometer material supercritical carbon dioxide anti-solvent, comprising a high-pressure pump for carbon dioxide, a high-pressure pump for solution, a nozzle, a crystallization reactor, a whole filtration membrane crystallizer, a separation reactor, and a cyclone separator, which is characterized in that: the nozzle and the whole filtration membrane crystallizer are arranged in the crystallization reactor, the aperture of the nozzle outlet is 1 to 1000um, the aperture of the whole filtration membrane crystallizer is 50 to 500nm, the cyclone separator is connected with the whole filtration membrane crystallizer arranged in the crystallization reactor, thus forming a closed recovery system for products. The preparation device has the advantages of large whole filtration membrane crystallizer area, fast crystallization, small particle size, uniform distribution, high crystallization rate of more than 80 percent, automatic collection of products without opening the cover of the crystallization reactor, ability to conversely blow the whole filtration membrane crystallizer utilizing carbon dioxide, and closely select products through the cyclone separator, thorough collection of products, rapid recovery of filter membrane flux, no pollution to environment, not harm to human body, less solvent consumption, high separation efficiency, fast speed, short cycle, low energy consumption, and easy operation.

The invention discloses a filter dielectric biological reactor in the effluent processing and water recycling technical domain, which is characterized by the following: adopting industrial filter cloth as porous bottom film; emulsifying and crosslinking polyvinyl alcohol and glutaraldehyde to obtain the microball as precoating agent; depositing microball on the outer wall and pore wall; forming polyvinyl alcohol nanometer microball dynamic film; fixing the film component on the frame; placing in the biological reactor; discharging water through sucking pump.

The invention discloses a method for washing an ultrafiltration membrane by combining ultrasonic waves and a chemical cleaning agent. The method comprises the following steps: washing the ultrafiltration membrane which is operated for a period of time, wherein the washing step is divided into physical washing and chemical washing; firstly, carrying out combined water and air backwashing on the ultrafiltration membrane and discharging all sewage in an ultrafiltration membrane assembly; preparing a sodium hypochlorite chemical washing solution and injecting the sodium hypochlorite chemical washing solution into an ultrafiltration membrane pool until the membrane assembly is immersed; immersing; then performing filtering and circulating backwashing; meanwhile, loading the ultrasonic waves to assist the chemical washing; finally, injecting a hydrochloric acid solution to immerse the membrane assembly, and immersing; then performing filtering and circulating backwashing; meanwhile, loading the ultrasonic waves to assist the chemical washing. Compared with the prior art, the method has the beneficial effects that an optimal medicament mass concentration and optimal ultrasonic frequency are obtained; ultrasonic wave assisting is added on the basis of the chemical washing to help to enhance the chemical washing effect and save medicament washing amount, so that the cost is saved.

The invention discloses a membrane bioreactor and a membrane bioreactor membrane pollution control device and method. The membrane bioreactor comprises a fluid medium conveying device, an injection device and a movement device, wherein an exhaust port of a gas compressor of the fluid medium conveying device is communicated with an air inlet of a pipeline switching device through a gas conveying pipeline; the gas conveying pipeline is provided with a check valve; a liquid outlet of a liquid pump is communicated with a liquid inlet of the pipeline switching device through a liquid conveying pipeline; the liquid conveying pipeline is provided with a check valve; the injection device comprises an injection pipe and a plurality of nozzles; an inlet of the injection pipe is communicated with anoutlet of the pipeline switching device through a pipeline; each outlet of the injection pipe is provided with one nozzle; the movement device is installed in or out of the MBR (membrane bioreactor);the injection device is arranged on the movement device. According to the membrane bioreactor and the membrane bioreactor membrane pollution control device and method disclosed by the invention, in-situ efficient control on aerobiotic and anaerobic MBR membrane pollution can be met, operation is simple, energy consumption is low, and an application range is wide.

The invention discloses a treatment process of a membrane bioreactor in nondegradable industrial wastewater, which comprises the following two stages: 1, continuous water feeding/discharge and aeration stage: while aerating, continuously feeding water into the membrane bioreactor and continuously pumping water, and entering the next stage after operating for a period of time; and 2, anaerobic stage: stopping feeding and discharging water and aerating so that the active sludge is in the anaerobic condition, and repeating the first stage after operating for a period of time. The treatment process can be used to enhance the treatment efficiency for high-concentration nondegradable wastewater, such as dyeing plant wastewater, factory finishing wastewater and the like, and increase the removalrate of total nitrogen, so that the quality of the discharged water can reach the standard for circulating cooling water, thereby converting sewage into resources.

The invention discloses a method for cleaning membrane pollution in the process of electrodialysis treatment on paper-making reconstituted tobacco extract liquor, which is used for cleaning an electrodialysis system generating membrane pollution through the cleaning processes of primary water washing, reversed-pole alkaline washing, secondary water washing, reversed-pole acid washing and tertiarywater washing in sequence. According to the cleaning method, membrane pollution in the electrodialysis process can be effectively solved, the desalination rate of an electrodialysis system is remarkably recovered, and reliable operation guarantee is provided for the process of treating the paper-making process reconstituted tobacco extracting solution through electrodialysis.

The invention discloses a cleaning method and a cleaning system of a tubular membrane, and provides a cleaning method and a cleaning system which can recover the membrane flux. The cleaning method comprises the following steps of: cleaning with clean water; cleaning through mixing particles, clean water and air: after mixing particles, clean water and air, and cleaning the mixture of particles, clean water and air in the tubular membrane, wherein air bubbles are broken caused by the collision of air bubbles and particles, energy is released extensively to cause partial vibration, and meanwhile, the particles and air bubbles are both rubbed with the membrane so as to lead to falling of pollutants on the surface of the membrane; and discharging the pollutants to complete the cleaning process. According to the cleaning method disclosed by the invention, the step of cleaning by mixing particles, clean water and gases is added; the air bubbles generated by the gases can be collided with the particles, and energy is released extensively so as to lead to partial vibration; turbulence is formed in a membrane component; particles flow rapidly in a system; and the air bubbles and particles are both rubbed with the surface of the membrane so as to remove surface pollutants. The cleaning effect and the cleaning efficiency can be improved greatly by combining with two aspects.

The invention provides a hollow fiber membrane cleaning agent and a preparation method and application thereof. The hollow fiber membrane cleaning agent comprises: sodium hypochlorite and a cleaning agent, which is at least one selected from the group consisting of a penetrating agent and a complexing agent. The hollow fiber membrane cleaning agent provided by the invention can effectively improve the cleaning effect on the hollow fiber membrane, shortens the cleaning time, is convenient to use, and does not generate secondary pollution.

The invention provides an alternate two-stage aerobic membrane bioreactor. The alternate two-stage aerobic membrane bioreactor comprises a first reactor MRR1, a second reactor MBR2, a regulating tank I, a flow meter, a valve, a centrifugal pump, an automatic-control motor case II, a water storage tank IV, an alkali liquor box III, an acid liquor box V, a first air blower GFJ1, a second air blower GFJ2, a perforated pipe aerating apparatus and an inka aeration apparatus. The invention can realize that after high concentrated organic waste water is hydrolyzed and acidized, the effluent is not subjected to methanogenic-phase reaction but directly enters into the aerobic membrane bioreactor for treatment, so that the effluent has qualified quality; and in the process, the effluent is ensured to be continuous, membrane fouling is retarded, membrane flux is recovered to the maximum limit, and full-automatic control, safety, stability and high efficiency are achieved.

The invention creatively provides a technological system for treating terrestrial heat tail water by utilizing a tubular membrane. The technological system comprises a cyclone sand remover, bag type filters, a tubular membrane filtering device, a washing tank, a washing ump, a degassing tank and an electric control device; two sets of the bag type filters are arranged; one bag type filter is usedand one bag type filter is standby, and the two bag type filters are alternatively used; the tubular membrane filtering device is divided into two grades; each grade comprises four tubular membrane filters which are arranged in parallel, three tubular membrane filters are used and one tubular membrane filter is standby; the system is provided with a thermometer, a pressure meter and a flow meter;the electric control device comprises a PLC (Programmable Logic Controller) and can realize online automatic backwashing of equipment and prevent fouling and blocking, so that stable operation of equipment is ensured. The technological system takes a tubular membrane as a core and integrates equipment including the cyclone sand remover, the bag type filters and the like to form a technology of treating the terrestrial heat tail water by utilizing a set of water treatment system; the technological system has the advantages of high integration degree, high automation degree, high treatment efficiency and long service life; water treatment can reach reinjection water quality requirements and the treatment cost of reinjection water is greatly reduced.

The invention provides a water purification device for a contaminated water body. The water purification device comprises N frames which are sequentially connected with one another and floating frames connected with the frames; each frame is composed of a hypoxic reaction tank and an oxygen-enriched filter tank; a water flow turning flow cavity is formed in each hypoxic reaction tank, the lower portion of each hypoxic reaction tank is provided with a sewage inlet, each hypoxic reaction tank is provided with a communication port, and the hypoxic reaction tanks are filled with filler; the bottom of each oxygen-enriched filter tank is provided with an aeration device, a dynamic membrane filter is arranged in an inner cavity of each oxygen-enriched filter tank, water in the oxygen-enriched filter tanks enters inner cavities of the dynamic membrane filters through the dynamic membrane filters, or the inner cavities of the dynamic membrane filters are communicated with river water through pipelines and delivery pumps, the bottoms of the inner cavities of the oxygen-enriched filter tanks are communicated with openings of sludge pipelines stretching into the lower portions of the inner cavities of the corresponding hypoxic reaction tanks through the sludge pipelines and sludge reflux pumps, and the portion, located over the corresponding frame, of each sludge pipeline is provided with an excessive sludge discharge valve. The water purification device has the advantages of being convenient to manufacture, capable of effectively utilizing carbon sources in water and good in water purification effect.

The invention discloses a novel coiled membrane separating technology with forward feeding and reversed washing processes. During the forward feeding process, a feeding valve is opened; a material delivering pump and a high-pressure pump are started; a membrane pile is switched to a normal feeding connection state; a break valve is adjusted, until a system pressure reaches a preset value, such that a membrane separating system operates normally; a liquid material is delivered into a circulation tank, and is delivered into the membrane pile through the material delivering pump and the high-pressure pump; substances penetrating the membrane form a penetration liquid, and substances that do not penetrate the membrane flow back to the circulation tank through the break valve and an condensation pipeline. During the reversed washing process, a water inlet vale is opened; the material delivering pump and the high-pressure pump are started; the membrane pile is switched to a state opposite to the normal feeding state; the break valve is adjusted, until a pressure required by washing is reached, such that the membrane separating system operates in a washing state. The invention also discloses coiled membrane separating equipment with forward feeding and reversed washing functions. With the technology and the equipment, material separating can easily be carried out, the service life of the membrane is prolonged, and the washing effect is improved.

The invention provides a cleaning method of an immersed ultrafiltration membrane. The method comprises the following steps: 1) carrying out primary alkali washing: emptying an ultrafiltration membranetank, conveying an alkaline cleaning solution into the ultrafiltration membrane tank until ultrafiltration membrane filaments are completely immersed in the cleaning solution, and carrying out soaking alkali washing on the ultrafiltration membrane; 2) backwashing the ultrafiltration membrane tank; 3) carrying out primary acid cleaning: emptying the ultrafiltration membrane tank, conveying an acidic cleaning solution into the ultrafiltration membrane tank to completely immerse ultrafiltration membrane filaments, and carrying out soaking and acid cleaning on the ultrafiltration membrane; 4) backwashing the ultrafiltration membrane tank; 5) carrying out secondary alkali washing: emptying the ultrafiltration membrane tank, conveying the alkaline cleaning solution into the ultrafiltration membrane tank until ultrafiltration membrane filaments are completely immersed, and carrying out soaking and alkali washing on the ultrafiltration membrane; 6) backwashing the ultrafiltration membrane tank; 7) carrying out secondary acid cleaning: emptying the ultrafiltration membrane tank, conveying the acidic cleaning solution into the ultrafiltration membrane tank till the ultrafiltration membranefilaments are completely immersed, and carrying out soaking and acid cleaning on the ultrafiltration membrane; and 8) backwashing the ultrafiltration membrane tank. The method has a remarkable recovery effect on cleaning of the ultrafiltration membrane polluted by multiple components at the same time and is excellent in working performance.

The invention belongs to the technical field of membrane separation, and relates to a membrane cleaning method in a membrane-method sugar manufacturing technology. The membrane cleaning method comprises the following steps: step (1) sequentially using deionized water, a sodium hydroxide solution, a mixed solution of sodium hydroxide and sodium hypochlorite and the deionized water to clean a clarification membrane; step (2) sequentially using the deionized water, a glucanase solution and the sodium hydroxide solution to clean a decolorizing membrane; and step (3) sequentially using the deionized water, the sodium hydroxide solution and the deionized water to clean a concentration membrane. The step (1) and the step (3) are not ordered. The membrane cleaning method in the membrane-method sugar manufacturing technology is customized for different pollution mechanisms of the clarification membrane, the decolorizing membrane and the concentration membrane, can effectively remove the membrane pollution, restores the membrane flux of each level, maintains the stable operation of a membrane-method cane sugar manufacturing system, and can reduce water consumption, discharge of wastewater and consumption of chemical reagents by recycling membrane cleaning waste liquid at all levels.

The invention relates to the technical field of sewage treatment, and specifically relates to a cleaning device and a cleaning method for a ceramic flat sheet membrane component. The cleaning device provided by the embodiment of the invention comprises an accommodating mechanism, a fixing bracket, an air blower, a first water inlet pipe and an ozone generator, a liquor is injected into an accommodating cavity first in use, the dirt on the ceramic flat sheet membrane component is soaked by the liquor, and is softened and separated, then the air is introduced to scour the dirt, the dirt cleaningefficiency is higher; the ozone is introduced into the ceramic flat sheet membrane component through an ozone generating mechanism, the pollutant in an inner channel and an aperture of a ceramic membrane is oxidized and degraded from inside to outside, the cleaning effect on the dirt at the inner part of the ceramic flat sheet membrane component is better, then tap water is used to flush back from the inner part to the outer part of a ceramic membrane sheet, the pollutant blocked in the aperture of the membrane is thoroughly removed, the membrane flux restoration effect is better, the cleaning efficiency is higher, and the cleaning time is reduced by a half or more.