Method for realizing residual sludge reduction by enhancing biological predation

The invention discloses a method for realizing excess sludge reduction by strengthening biological predation, and belongs to the technical field of sludge treatment. The method for enhancing biological predation to realize excess sludge reduction comprises the following steps: (1) pretreating excess sludge, so that the COD content of excess sludge supernate is increased to 400 mg/L or above; (2) adding the pretreated residual sludge into a worm bed reactor for reducing the residual activated sludge, and performing reduction treatment; wherein the pretreatment comprises one or more of low-temperature heat treatment, microwave treatment and ultrasonic treatment; wherein the low-temperature heat treatment comprises the step of heating for 30-80 minutes at 70-90 DEG C; the microwave treatment is carried out for 5 to 30 minutes under the power of 100 to 700 W; the ultrasonic treatment refers to ultrasonic crushing for 2-20 minutes under the output power of 1%-10%. The properties of the residual activated sludge ar