パン酵母培養廃液の処理および利用に関する研究 : (第7報)活性スラッジの酸素消費について

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In practical treatments of culture waste of baker's yeast in its disposing plants, holding MLSS constant, during the past year, it was found that dissolved oxygen in aeration tanks was remained high in the concentration in winter. However, it became scanty in summer. Accordingly, this work was undertaken to study oxygen consumption with washed activated sludge and a mixed liquor in a large practical aeration tank. The results of the studies are summarized as follows : 1. As the results of the studies on the effects of the dissolved oxygen concentration, MLSS concentration, pH, BOD in a supernatant solution and water temperature on the oxygen consumption with washed activated sludge, it was found that the consumption was affected much more by water temperature than by the other factors and, when water temperature was 10℃ in the aeration tank in winter, the oxygen consumption was about 25% of that at 25℃ in summer. 2. Oxygen consumption in a mixed luquor was also affected distinctly by water temperature and there was a linear relation between oxygen consumption and water temperature. Relative oxygen consumption rate with washed activated sludge was the same as that with a mixed liquor at an equal water temperature. However, the oxygen consumption rate value with the mixed liquor was distinctly lower than that with washed activated sludge. 3. The optical MLSS was calculated from KLa and the oxygen consumption rate obtained by these experiments in order to preserve the optical concentration of oxygen, and it was found that the optimal MLSS at 10°, 15°, 20°was found to be 8500,4000,2500 and 1900 ppm respectively.
社団法人日本生物工学会の論文
1968-07-25

パン酵母培養廃液の処理および利用に関する研究 : (第7報)活性スラッジの酸素消費について

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