Study On Anoxic-oxic MBR Process For The Treatment Of Domestic Wastewater And Application To The Scenic Environment

Domestic wastewater was treated by the anoxic-oxic membrane bioreactor (MBR) process for the supply of landscape lake in this paper. The bench-scale test result showed that aluminum sulfate was added into oxic MBR, the monitoring indices of COD, BOD5, ammonia, total nitrogen and total phosphorus were removed with high efficiency of 92.5%, 97.6%, 95.4%, 89.5% and 93.2%, respectively, when the content of alkalinity in feeding wastewater was proper.Dependent on the bench-scale test, a set of domestic wastewater reclamation engineering with capacity of 400 m~3/d was built. The test results indicated the high removal of pollutants was achieved in the operation. The indices of feeding and treated wastewater quality were as follows: 260-320 mg/L of COD, 98-162 mg/L of BOD5, 18-29 mg/L of ammonia, less than 9.8 mg/L of total phosphorus and 89-176 mg/L of suspended solids in feeding water, while 7-22 mg/L, 0-3 mg/L, 0.1-1.2 mg/L, <0.5 mg/L and ~0 mg/L in treated water. It was obvious that these indices could meet the requirements of the state standards of the reuse of urban recycling water--Water quality standard for scenic environment use (GB/T18921-2002).During the two years'operation the indices of total phosphorus, total nitrogen, chlorophyllα, transparency and COD were monitored, and no trend of eutrophication occurred in the landscape water.