| 摘要 |
<p>PURPOSE:To efficiently reduce the volume of the org. sludge, such as excess sludge or anaerobically digested sludge, etc., generated by an activated sludge method by subjecting the org. sludge to oxidation decomposition by an oxidizing agent with metal ions as a catalyst in a narrow space and at a short period of time. CONSTITUTION:The excess sludge is introduced into an oxidizing vessel where the excess sludge is subjected to the oxidation decomposition by adjusting the sludge to required pH (about 2 to 8) and adding the oxidizing agent and catalyst thereto at the time of subjecting the excess sludge or anaerobically digested sludge, etc. (hereafter, excess sludge) generated by an activated sludge treatment to a volume reduction treatment. More preferably, the sludge prior to the oxidation treatment is sufficiently previously deflocculated by an ultrasonic treatment so that the oxidation decomposition reaction of the sludge is sufficiently executed. The sludge after the oxidation decomposition is introduced through a neutralizing vessel into a settling basin where the liquid component is desorbed from the sludge component. This liquid is discharged. The metal ions which are preferably iron ions are used as the catalyst and hydrogen peroxide is used as the oxidizing agent, respectively.</p> |
