Distillery wastewater of sweet potato-Shochu and barley-Shochu after removing suspendid solids (SS) was treated at 53°, respectively, with an anaerobic fluidized-bed reactor in which a support medium cristobalite was filled up to 20%.In treating distillery wastewater of sweet potato-Shochu, the loading rate of TOC of 12 g/l.d could be achieved after about two weeks from the start-up. The maximum loading rate of TOC was 20 g/l.d, and the corresponding removal efficiency of TOC and treatment time were 83% and 0.9 days, respectively.Distillery wastewater of barley-Shochu could not be treated well. However, the five-fold diluted wastewater could be treated, resulting in the loading rate of TOC of 10 g/l-cl with the corresponding removal efficiency of 80%. This loading rate was about ten times as large as that attained in aerobic treatment. The corresponding production yield of gas was 1.42 l/g TOC consumed, and methane content of gas was about 60%. The yield of sludge was about 0.09 g/g TOC consumed, and this value was less than 1/10 that attained in the aerobic treatment.From estimation of performance under the both conditions, it was revealed that the anaerbic treatment was superior to the aerobic treatment in treating distillery wastewater of Shochu.
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