Can MBR film be used in very cold winter?
MBR membrane can be used in very cold winter, but special maintenance and operation measures need to be taken to ensure its normal operation. Here are some key points:
Temperature effect: In winter, lower water temperature can cause fiber membrane pores to shrink, and at the same time, the viscosity of water increases. The rate of passing through the MBR membrane will decrease, and the resistance will also increase. This may lead to a decrease in water production, which is a normal situation. However, when the inlet water temperature is below 0 ℃, There is a risk of irreversible frost damage to MBR membrane components.
Protective measures: To prevent damage to the MBR membrane at low temperatures, some protective measures can be taken. For example, insulation is applied to key treatment units such as aeration tanks and secondary sedimentation tanks, such as using foam insulation boards to cover the tank walls, external brick enclosure and filling with insulation materials, and covering the tank top to reduce heat loss.
Operation adjustment: In a low-temperature environment, the aeration rate can be appropriately increased. This not only provides the oxygen required by microorganisms, but also raises the water temperature through the stirring effect of bubbles. At the same time, it helps to slow down sludge expansion and membrane fouling. In addition, adjust operating parameters such as pH value and sludge retention time (SRT) according to actual conditions to adapt to changes in microbial activity under low temperature conditions and ensure treatment efficiency.
Maintenance and cleaning: Under low temperature conditions, membrane fouling may be more severe. Therefore, it is necessary to increase the cleaning frequency of membrane components, including physical cleaning (such as backwashing) and chemical cleaning, to remove sediment and prevent scaling.
Use of protective solution: For backup or stored MBR membrane components, it should be ensured to use a protective solution suitable for low temperature conditions, and the protective solution should be checked and replaced according to the recommended cycle to prevent freezing or microbial growth.
In summary, although MBR membranes can be used in very cold winters, a series of maintenance and operation measures need to be taken to ensure their normal operation and extend their service life.