活性汚泥法実装置におけるBOD除去性能の変動およびその管理

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In the previous paper, various factors which affect the BOD removal from industrial waste water, using the activated sludge process, were studied in small scale experiments, and a method to control the process was proposed. This work was undertaken to ascertain the effects of the various factors in a large scale plant, and to verify a method for keeping the efficiency of the BOD removal from the plant at a high level all year round.The results of this work are summarized as follows : 1. The MLSS (mixed liquor suspended solid) value and the BOD value in the effluent were kept constant all year round; the BOD removal value (kg/m^3 day) in a large scale plant varied according to the water temperature in the aeration tank; the value in winter was less than one half of that in summer. The dissolved oxygen in the aeration tank decreased quickly as the temperature rose, and became zero at more than 20℃.2. The relation between the oxygen consumption rate and the water temperature in a large scale plant coincided with the results from small scale experiments.3. The K_La_<20> value in the large scale aeration tank was determined and calculated to be 6.11. The dissolved oxygen value in the aeration tank, which was calculated theoretically on the basis of K_La_<20>=6.11,coincided with the value determined practically.4. A control method for a large scale plant was proposed, which would be able to remove excess dissolved oxygen from the aeration tank in winter and to correct the anaerobic condition which obtains in the summer. This method involves changing the MLSS according to the water temperature.The MLSS in winter is 4 times that in summer. Using the method, the efficiency of the plant (BOD loading, 1.6 kg/m^3 day; BOD removal, 1.25-1.3 kg/m^3 day) could be kept constant throughout the year.
社団法人日本生物工学会の論文
1971-08-25

活性汚泥法実装置におけるBOD除去性能の変動およびその管理

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