Biological Aerated Filter (BAF) is a new type of high-load submersed three-phase reactor, which has the advantages of both activated sludge technology and biofilm treatment technology.

The characteristics are as follows:

     It has the function of removing SS, COD, BOD, nitrification and denitrification. Its main feature is that it integrates biological oxidation and interception of suspended solids,which cut down the subsequent sedimentation tank and treatment process. In addition, the biological aerated filter process has high volumetric load of organic matter, large water conservancy load, short hydraulic retention time, low capital investment, low energy consumption and operating cost, and the process has good effluent parameters.