Method for treating sludge in secondary sedimentation tank of domestic sewage plant

The invention provides a method for treating sludge in a secondary sedimentation tank of a domestic sewage plant, which comprises the following steps: modifying bamboo powder, adding the modified bamboo powder into the sludge in the secondary sedimentation tank of the domestic sewage plant, and uniformly mixing to obtain secondary sludge; treating the second-stage sludge by a bead mill to obtain third-stage sludge; adding polyacrylamide into the third-stage sludge, and obtaining fourth-stage sludge after even mixing; dehydrating the fourth-stage sludge by using a plate-and-frame filter press to obtain finished sludge and wastewater; conveying the wastewater back to a domestic sewage plant to be treated, and using the finished product mud as fuel. Compared with the prior art, the method hasthe following beneficial effects: 1, the moisture content of the treated sludge can be greatly reduced, and the sludge can be used as the fuel; 2, the sludge is treated by adopting a physical method,and the added auxiliary m