The role of MBR membranes in wastewater treatment
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For wastewater treatment, we currently use a process that combines hydrolysis, contact oxidation, and MBR. I’ve always been puzzled about how MBR should be operated: is the DO level in the MBR membrane tank the same as that in the aerobic tank? Is intermittent aeration possible? How long can intermittent operation continue without causing clogging of the membranes? Does the pump that transfers water from the MBR membrane tank to the aerobic tank need to run continuously? What should be the optimal sedimentation ratio? Our wastewater has a COD level of 300, ammonia nitrogen at 15, total phosphorus between 3 and 5, and BOD at 100. Does MBR serve any other functions besides filtering out impurities?
Regarding the operating cycle of the return sludge pump that has been used personally, it depends on the sludge concentration and sludge age; the sludge concentration is generally around 8 g/L, with higher values of around 10 g/L. Return of sludge or disposal of excess sludge should be carried out once these conditions are met. As for dissolved oxygen aeration, aeration should not be stopped during normal operation; the valve can be adjusted to control the dissolved oxygen level. MBR ensures the quality of the effluent water and is primarily used in reclaimed water reuse projects.