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MEMBRANE FAMUTION PROTECTION METHOD FOR MBR PLATE
Release time:
2023-05-11
MEMBRANE FAMUTION PROTECTION METHOD FOR MBR PLATE The flow rate of MBR flat membrane refers to the amount of liquid passing through per unit area per unit time under a certain pressure. Flux is related to membrane material (e. g., ppppvdf), fabrication process (e. g., needle-nose pliers), pore size, and strength.
MEMBRANE FAMUTION PROTECTION METHOD FOR MBR PLATE
The flow rate of MBR flat membrane refers to the amount of liquid passing through per unit area per unit time under a certain pressure. Flux is related to membrane material (e. g., ppppvdf), fabrication process (e. g., needle-nose pliers), pore size, and strength.
The increase in pressure flux will increase, but the blockage will be faster. A larger pore size can increase the flux, but the rejection rate must be very low, so the water flux is only an indicator of the membrane.Definition in GB/T 2013 -2006 Membrane Separation Technical Terms: Flux, component fraction per unit area of membrane per unit time.
MBR flat membrane: In the field of sewage treatment and water reuse, MBR flat membrane, also known as MBR flat membrane, is a new type of water treatment technology combining activated sludge process and membrane separation technology. According to the separation mechanism, it can be divided into reaction membrane, ion exchange membrane, permeable membrane, natural membrane (biological membrane), synthetic membrane (organic membrane and inorganic membrane), flat membrane, tubular membrane, spiral membrane and hollow fiber membrane.
How to clean MBR flat membrane after use? Three measures are needed to solve the problem of MBR flat membrane fouling and clogging. There are three solutions to membrane fouling. How to clean MBR flat membrane after use? Three measures are needed to solve the problem of MBR flat membrane fouling and clogging. There are three solutions to membrane fouling.
Pretreatment isAn important part of the MBR process. Wastewater contains a large number of impurities, fibers and suspended solids, which will block the surface of the membrane, thereby reducing the permeation area of the membrane and causing membrane pollution.
1. The selection of membrane elements should be based on technical analysis and economic evaluation.
From the strength, stability, life and cost to determine. In theory, the selection of large pore size membranes can increase water flux while retaining contaminants. However, in practical applications, it is found that choosing a larger membrane pore size can accelerate membrane fouling and rapidly reduce membrane flux. Generally speaking,The size of the MBR flat sheet membrane cut particles is an order of magnitude smaller than the size of the separated contaminants. By changing the physical and chemical properties and hydrophobicity of the membrane surface, the anti-fouling ability of the MBR flat membrane can be improved and the membrane fouling can be reduced.
2. Improve the properties of the mixture
It can effectively reduce the concentration of suspended solids in the mixture and increase the activity of sludge, thereby slowing downFouling rate of MBR flat membrane.
3. The membrane fouling process can be slowed down by optimizing the operating conditions in the subcritical flux zone.
When the permeation flux is lower than the critical flux,TMP remains stable and contamination is reversible. On the contrary, when the permeation flux exceeds the critical flux, TMP increases the agility and instability, at which time the flow decreases and the pollution is irreversible. The cleaning effect of aeration on the surface of MBR flat membrane is mainly manifested as the cross-flow effect of mixed sludge and bubbles on the membrane surface, and then the impact effect on the membrane surface is washed. The aeration intensity can improve the removal rate of film deposition. If the film deposition is serious, the aeration of sewage should be stopped. Aeration is an effective method to remove film deposits. For a submerged MBR, the air stops aeration after a few minutes of pumping. Under the action of the updraft, the scouring of the MBR flat membrane surface is conducive to the formation of concentration polarization. At the same time, under the influence of the updraft, the pollutants accumulated on the surface of the MBR flat membrane will be separated from the surface of the MBR flat membrane and returned to the main slurry water mixture, which is beneficial to reduce membrane pollution.
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