| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a treatment method of sewage and sludge, which can stably solubilize the sludge at a low cost by treating the sewage biologically. SOLUTION: In this treatment method of sewage and sludge, organic sewage is treated in a biological treatment tank, the sludge generated by the biological treatment is solubilized, and the solubilized sludge is returned to the biological treatment tank. The solubilization of the sludge is carried out by applying a pressure of 0.1-22 MPa to the sludge, then quickly reducing the pressure, and adding an enzyme thereto.</p> |
