| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the vol. of sludge to a large extent, to certainly prevent the deterioration of the concn. of phosphorus in treated water and to prevent the BOD load of a biological treatment process of org. sewage from becoming high. SOLUTION: Excessive sludge generated from a biological treatment process 22 of org. sewage is treated with ozone 2 or aerated in an aeration tank 3 separated from the biological treatment process 22 as it is and the outflow slurry from the aeration tank is subjected to solid-liquid separation in a solid- liquid separation tank 4 and the separated sludge or a part of the sludge in the aeration tank is returned to an ozone treatment process and phosphorus contained in separated water in solid-liquid separation is chemically removed by a phosphorus removing means 8.</p> |
