| 摘要 |
<p>PURPOSE:To provide a method for treating organic drainage which can conduct the aerobic treatment by decomposing sludge efficiently with a small consumption of ozone, controlling the generation of excessive sludge, or preventing the generation if necessary. CONSTITUTION:Liquid to be treated 6, return sludge 7, sludge 19 treated with ozone are fed to an aeration tank 2 in an aerobic treatment system 1, and they are mixed with active sludge in the aeration tank 2 to be treated aerobically. A mixed liquid 10 is separated in a solid-liquid separation part; a part of the separated sludge 12 is returned to the aeration tank 2 as the return sludge 7, and another part of the sludge 12 is fed to an acid fermentation treatment tank 4 as an extracted sludge 13 to be subjected to acid fermentation treatment in an anaerobic atmosphere. The sludge 16 treated by acid fermentation is introduced an ozone treatment tank 5 to be treated with ozone, and the sludge 19 treated with ozone is fed to the aeration tank 2 to be treated aerobically.</p> |
