What are some ways to clean an MBR tablet film?
Published Time:
2021-02-23
mbr flat sheet membrane It is an important component of today's wastewater treatment systems, but the goal of membrane separation in membrane bioreactors is generally for highly polluted wastewater containing more organic and inorganic substances. Although we have pre-treated the wastewater to a certain extent, sludge and other dirt will still accumulate after long-term use. Once the mbr flat sheet membrane is polluted, it will cause membrane pore blockage, leading to a decrease in membrane flux. Therefore, it is necessary to clean the membrane module to restore the membrane flux and prolong its service life. So, what are the cleaning methods for MBR membranes?
1. Air aeration cleaning: Air aeration cleaning is a physical cleaning method that enhances the water flow circulation effect. That is, when the inflow and outflow are stopped, high-intensity continuous aeration is carried out for 2-3 days. Through the action of water circulation and shear force, the sludge layer deposited on the membrane surface is washed away.
2. mbr flat sheet membrane Online cleaning methods are a good way for us to clean membranes. Without removing the membrane module, we can directly clean it with chemical reagents.
3. When online cleaning cannot remove the fouling on the mbr flat sheet membrane, direct removal cleaning is used. We need to take out the membrane module from the purification system, place it in a clean container or on a clean flat ground, wash it with pressurized water such as a high-pressure water gun, and then soak it in a special container with alkaline cleaning for more than 5 hours, which can effectively clean the MBR membrane. Of course, severely polluted membranes can be directly removed and cleaned without online cleaning.
4. Water backwashing: Water backwashing refers to applying backwashing pressure at the membrane outlet to flush the treated water or a mixture of treated water and air through the membrane. Water backwashing has high requirements for membrane function. To prevent water quality deterioration due to membrane damage, backwashing should be performed under low pressure.
5. mbr flat sheet membrane Offline cleaning: The cleaning formula is 0.5% sodium hydroxide (that is, add 25 kg of 99% sodium hydroxide solution per 5 tons of water), 25-50 kg of 500-1000 ppm sodium hypochlorite solution per 5 tons of water.
