Biological interceptor and sewage treatment system

The invention discloses a biological interceptor and a sewage treatment system in the technical field of sewage treatment.The biological interceptor is characterized in that an inclined plate, a sludge collecting pipe, a sludge discharging pipe and an effluent weir groove are arranged in an interceptor shell of the biological interceptor, the inclined plate is used for preventing sludge in sewage from rising, and the end of the sludge discharging pipe penetrates through the inclined plate and extends into the bottom of the interceptor shell to be connected with the sludge collecting pipe; the effluent weir tank is positioned on the upper side of the inclined plate and is connected with the clean water tank or the next treatment unit; the system further comprises an aerobic tank and an anoxic tank/sludge tank which are connected with one or more biological interceptors. According to the invention, the phenomena of unsmooth and incomplete sludge discharge and sludge leakage of discharged water of a traditional