METHOD AND APPARATUS FOR TREATING SEWAGE AND SLUDGE

摘要

PROBLEM TO BE SOLVED: To provide a method and apparatus for treating sewage and sludge capable of markedly enhancing the treatment capacity of excess sludge in a biological treatment tank. SOLUTION: In the method for treating sewage and sludge constituted so that wastewater is biologically treated in the biological treatment tank 1 and the sludge generated by biological treatment is solubilized to be returned to a biological reaction tank, excess sludge is solubilized in a solubilization apparatus 4 by a combination of a termperature of 50-300 deg.C and a pressure of 0.1-10 MPa and the treated matter is returned to the biological treatment tank 1. Before the excess sludge is solubilized, the concentration thereof is adjusted by a concentration adjusting means 3.