| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a treatment method generating almost no excessive sludge by a simple treatment means in the aerobic biological treatment of org. sewage. SOLUTION: In a method subjecting org. sewage 12 to aerobic biological treatment 1 and subjecting a part 15 of obtained sludge to solubilizing treatment to return the same to an aerobic biological treatment process 1 to treat the sludge, the solubilizing treatment is performed by combining acidic oxidizing treatment processes 4, 4' using an acidic oxidizing agent 20, alkali treatment processes 5, 5' using an alkali agent 21 and an ultrasonic treatment process 24. The acidic oxidizing treatment processes and the alkali treatment processes are provided in parallel or in series and each of them is composed of an individual process or a plurality of processes and, before or after a series of the acid and alkali treatment processes, the ultrasonic treatment process is provided or after the alkali treatment processes, the ultrasonic treatment process is provided in series. In the acid and alkali treatment processes composed of a plurality of processes, all of the acidic oxidizing agent and the alkali agent are introduced into the front stage processes of the processes and sludge to be treated is distributed to be introduced into the respective stage processes.</p> |
