パン酵母培養廃液の処理および利用に関する研究 : (第6報)活性スラッジの沈降性改良について

概要

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In the treatment of baker's yeast culture waste by the activated sludge process in its disposing plants, the activated sludge becomes poor in settling in winter due to a low water temperature, inducing a part of the sludge to remain unseparated. In order to improve the sedimentation of the sludge, treatments with various nutrients or coagulants were undergone.The results of the studies are summarized as follow : 1. The sedimentation and BOD removal efficiency of activated sludge could be improved by an addition of urea as a nitrogen source. The improvement became greater according to the increase in nitrogen content in the range of 20 to 100ppm. This method of improvement is low in cost. However, it requires a comparatively long time for acclimatization. 2. Sanpoly K (a cationic high molecular coagulant) at 20 ppm improved the settling characteristic of bulked activated sludge without depressing of BOD removal and oxygen consumption. An addition of Sanpoly K took immediate effect. However, this treatment must be continued to obtain a constant effect. 3. The effect of urea for improvement of sedimentation of activated sludge was also confirmed on a plant scale.
社団法人日本生物工学会の論文
1968-07-25