ANAEROBIC TREATMENT OF DISTILLERY WASTE-WATER FROM BARLEY-SHOCHU MAKING BY UASB

Distillery wastewater from barley-shochu making was anaerobically trea ted by a single upflow anaerobic sludge blanket (UASB), and stable ope ration at a volumetric TOC loading rate of 3 g/l . d could be attained by diluting raw wastewater to give a TOC concentration of less than 6 ,000 mg/l (18,000 mg/l as CODcr). When the distribution of the concent rations of aliphatic acids at various levels within the reactor was in vestigated, it was found that the methanogenic gasification reaction d id not occur in the sludge blanket of the reactor. Distillery wastewat er from harley-shochu making with various TOC concentrations was preli minarily adjusted to pH 7 and treated by a single passage without circ ulation of effluent to the bottom of the reactor. As a result, a maxim um TOC removal rate (V(max)) of 28.5 g/1.d and a saturation constant ( K(s)) of 0.63 g/l were obtained.