Method for processing excess sludge of town sewage plant using angleworm bio-filter

A method for the treatment of excess sludge in an urban sewage plant by means of an earthworm bio filter relates to a method for the treatment of excess sludge in an urban sewage plant. The method comprises the following steps: firstly, SS contained in the excess sludge is controlled at 1000mg/L; then, an earthworm bio filter is set up, and earthworm is introduced; porcelain granules with the grain size of between 10 and 13 millimeters and between 6 and 9 millimeters are packed in an upper layer and a lower layer inside the bio filter; meanwhile, Eisenia foetida is evenly introduced into the porcelain granules according to the volume density of 1.13X10 per cubic metre of filter material; a bottom plate of the bio filter is provided with evenly distributed holes; sludge flows by successfully domesticated earthworms among the porcelain granules from a water distributor arranged on the top end of the bio filter; under the action of enzyme systems such as abundant protease of the earthworms, organic substances in