| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a treating method and device capable of entirely solving such probrems that foams are generated by an ozone diffusion and a sludge is overflowed from a tank and a treatment of a waste gaseous ozone is required, moreover, a pump for returning the sludge to an ozone diffusing tank is specially required, so that the device is mad expensive. SOLUTION: In the treating method in which an org. sewage is subjected to an aerobical biological treatment in a plug flow type aeration tank, then a biological sludge is subjected to a solid-liq. separation, a part at which a gaseous ozone is diffused is provided at an upstream side in the aeration tank, and a return sludge out of a separated sludge generated by the solid-liq. separation is divided into at least two, and one part is returned to the upstream side distant from the gaseous ozone diffusing site and a residual part is returned to a downstream side distant from the gaseous ozone diffusing site respectively.</p> |
