Powered buried integrated treatment technology can be divided into biological touch oxidation, SBR, A/O and A2/O according to the process. The principle of the commonly used A/O treatment technology is that in the anoxic pond, the microorganisms reduce the nitrate nitrogen and nitrite nitrogen in the sewage into gaseous nitrogen and escape, and at the same time, the refractory macromolecular organic matter is differentiated into small molecular easily degradable substances. , has the effect of denitrification, hydrolysis and degradation of some organic matter: in the aerobic tank, most of the organic matter is treated by microorganisms, and enters the secondary sedimentation tank for separation of mud and water, and is discharged after disinfection. The A/O process degrades organic matter at the same time as denitrification, which greatly reduces the oxygen demand. It is an energy-saving biological treatment technology. In order to maintain a high nitrification rate, the reaction residence time is longer than that of the ordinary activated sludge method, the sludge settling performance is good, the sludge growth rate is low, the amount of remaining sludge is small, and the settling performance is good.