METHOD FOR FLOCCULATING AND RECOVERING USEFUL SUBSTANCE FROM FERMENTATION RESIDUAL SUSPENSION WITH FLOCCULANT PRODUCED BY MICROORGANISM

摘要

PURPOSE:To readily and safely obtain a useful substance by bringing a flocculant containing a bacterial culture of the genus Rhodococcus and/or treated substance thereof into contact with a fermentation residue suspension in the coexistence of a cationic substance. CONSTITUTION:A strain, such as Rhodococcus.erythropolis, is inoculated into a culture medium, such as glucose, KH2PO4, MgSO4, urea or yeast extract, and cultured at 20-40 deg.C and pH4-11 for 2-7 days by a spinner method in a liquid culture medium with aeration to afford a culture (A), which is then treated by a precipitation method with ammonium sulfate, etc., to provide a flocculant (B). The component (B) and a cationic substance, such as CaCl2, capable of forming bi- or polyvalent cations, are subsequently added to a fermentation residue suspension (C) of alcoholic fermentation (e.g. industrial alcohol or beer) and brought into contact therewith at pH=5 while being stirred to flocculate and recover a useful substance.