活性スラッジによる産業廃水の処理に関する研究 : (第1報)糖蜜消化液の処理について

概要

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It has been known that BOD of molasses alcohol slops are removed for the most part by the methane fermentation. However from 5,000 to 10,000 ppm of BOD still remains in its digestive fluid. Accordingly, on the treatment of the activated sludge in the fluid, laboratory tests were conducted by a shaking method.The optimum conditions for the purification at 25℃ were as follows. The aeration rate was 3 to 10×10^(-7) in Kd value by the sodium sulphite method, pH value was from 6 to 8 and the sludge concentration was 5 to 6 % after centrifugation at 3,000 rpm for 10 minutes.By the batch wise test with 220 to 1,760 ppm of the initial BOD, it was confirmed that the maximum BOD loading of the fluid was 3.5 to 4.0 kg/m^3/day.As the results of the semi-continuous treatment test the with the BOD loading of 3.0 kg/m^3/day, it was found that both the suspended solids and BOD were removed more than 95 % irrespective of the dilution rate of the original fluid.The sedimentation rate of the sludge was high, and the amount of the sludge produced during the purification process was 0.9 to 1.2 % in dryness of the total weight of the digestive fluid used.When the activated sludge turned abnormal by some reason, it was confirmed that the addition of peptone (1.000 to 2,000 ppm) was remarkably effective for restoration of the activity.
社団法人日本生物工学会の論文
1964-04-15