TREATMENT OF LIQUID CONTAINING ORGANIC SUBSTANCE

PURPOSE:To efficiently utilize the residual pressure which has been discharged heretofore and to reduce electric power by charging a fluidizable carrier deposited with bacteria into a reaction vessel and returning the pressurized concd. liq. recovered from the concd. liq. side of a membrane separator to the reaction vessel. CONSTITUTION:A reaction vessel 1 and a membrane separator 3 are arranged in the order described, an org. substance-contg. liq. is introduced into the vessel 1 for a biochemical reaction and the treated liq. discharged from the vessel 1 is introduced under pressure into the separator 3 wherein low-molecular valuable materials are separated by a membrane into the permeated liq. side of the membrane. The org. substance-contg. liq. is thus treated. In the method, a fluidizable carrier deposited with bacteria is charged into the vessel 1 and the pressurized concd. liq. recovered from the concd. liq. side of the separator 3 is returned to the vessel 1. Namely, the pressure remaining on the concd. liq. side and which has been discharged heretofore without being reutilized can be utilized and the cost of power required for the formation of fluidized bodies can be reduced.