METHOD FOR TREATING SEWAGE AND SLUDGE

摘要

PROBLEM TO BE SOLVED: To provide a method for treating sewage and sludge, capable of efficiently and safely reducing the volume of generated excess sludge at a low cost. SOLUTION: In the method for treating sewage and sludge constituted so that organic sewage of sewerage or the like is biologically treated in a biological treatment tank 10 and the sludge formed by biological treatment is solubilized and this solubilized sludge is returned to the biological treatment tank 10, the sludge pressed to a range of 0.1-22 MPa in the solubilizing tank 3 of solubilizing equipment 30 is introduced into a vacuum apparatus 4 and the pressure of the sludge is suddenly reduced in the vacuum apparatus 4 to apply impact force to the sludge to solubilize the sludge.