Method for quickly using urban sludge as backfill soil for construction

The invention relates to the technical field of sludge environment-friendly treatment, and discloses a method for rapidly using urban sludge as backfill soil for construction. The method comprises thefollowing steps: S1, adding a hardening and tempering agent into the urban sludge, and uniformly stirring to obtain hardened and tempered sludge; S2, carrying out plate-and-frame filter pressing on the hardened and tempered sludge to obtain a sludge cake; S3, crushing the filter pressing mud cake by using a crusher to obtain a crushed mud cake; S4, adding a soft soil curing agent into the crushedmud cake, and uniformly mixing to obtain cured sludge; S5, paving the cured sludge on a cement floor, and turning and airing until dried sludge is obtained; and S6, mixing the dried sludge with natural soil in proportion to obtain the backfill soil for the construction land. According to the method, heavy metal elements in the sludge can be effectively solidified while the water content of the urban sludge is reduced, the