| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce the weight of excess sludge by a method in which organic pollutants and microorganisms in excess sludge are crushed finely, a hydrolysis enzyme is extracted outside from the microorganisms, and the sludge in which the biodegradation of polymeric organic substances is accelerated by the enzyme is returned to a sludge tank. SOLUTION: In a weight reduction apparatus 1, excess sludge from an excess sludge storage tank B is precipitated/concentrated temporarily in a sludge tank 7, the concentrated sludge is introduced from the upper part of a crusher 2 by a pump P. The finely crushed sludge introduced into a hopper 8 is cooled as required by a cooler 9, and after its flow rate being measured as required by a flow meter 10, is returned to the sludge tank 7. By retaining the return sludge in the tank 7 for a prescribed time molecular weight reduction is accelerated by an organic substance hydrolase, the solubilization of the sludge is promoted, so that the weight of the excess sludge is reduced promptly. By adding the sludge the solubilization of which is promoted into an activated sludge process treatment apparatus A, the weight of the excess sludge in the apparatus A is also reduced.</p> |
