Anaerobic treatment manner null of organicity Characteristic

摘要

PROBLEM TO BE SOLVED: To provide an anaerobic treatment method of org. sludge capable of recovering soluble org. matters (lower fatty acids). ;SOLUTION: In the anaerobic treatment method using membrane separation in which a separation membrane 3 is installed in a biological reaction tank 2 for subjecting the org. sludge to the anaerobic treatment and released liq. is separated by the separation membrane 3, the recovery of membrane flux and decreasing of the molecular weights of hardly decomposable org. matters are attained by treating the surface of membrane with ozone. Ozone treatment is executed preferably after stopping the circulation of fermentation liq. The recovered soluble org. matters can be effectively used as a hydrogen donor for denitrifying bacteria.;COPYRIGHT: (C)2000,JPO