METHOD FOR REMOVING OIL AND/OR PUTREFIED SUBSTANCE FROM LIQUID WASTE AND APPARATUS FOR ADDING OIL-REMOVING AGENT

摘要

PROBLEM TO BE SOLVED: To provide a method for removing oil and/or putrefied substance contained in liquid waste, thereby preventing the clogging of a screen.;SOLUTION: In this method for removing oil and/or putrefied substance, an oil-removing agent is added to liquid waste-to-be-treated before first screen treatment, thereby separating oil and/or putrefied substance contained in the waste. Septic tank sludge, night soil, or rural colony waste water sludge can be applied as the liquid waste. Chemical synthetic fiber having a thickness of several μm to 1 mm and a length of several mm to several cm or a material prepared by impregnating the synthetic fiber with a surfactant can be used as the oil-removing agent. The addition of the oil-removing agent can be performed in the inlet passage of the liquid waste-to-be-treated, in a receiving tank, or in a screen treatment part. The separation of the oil and/or the putrefied substance can be carried out by collecting the oil-removing agent by a screen.;COPYRIGHT: (C)2002,JPO