気泡曝気の曝気性能とその経済性について : "曝気槽の総括酸素移動容量係数算出法とその応用に関する研究(第4報)"

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In these studies, the oxygen transfers of two experimental diffuser placement aeration system were tested. One of them was a single spiral flow system and the other was a double spiral flow system. Both systems utilized spargers for diffusing air. With carious depths of diffuser and various flow rates, the over-all oxgen transfer coefficient K_La, was measured by meanes of the "moment" method; using these results, the power economy of the aeration system in the sewage treatment process was investigated.1. In both systems, the following equation is satisfied between the air flow rate, G_S, and the K_La at various diffuser depths, h : K_La=b・G_S ^n・h^m where b and n were changed with the diffuser depth.In a single spiral flow system, b ranges from 0.58 to 0.89 and n ranges from 0.65 to 0.89. On the other hand, b ranges from 0.38 to 0.96 and n ranges from 0.77 to 0.96 in a double spiral flow system.2. The following equation was satisfied between power consumption per unit volume and air flow rate per unit volume : P/V=a・(G_S/V)^α where a and α were changed with the diffuser depth. In a single spiral flow system, a ranges from 0.0026 to 0.0060 and α ranges from 0.98 to 1.30. In a double spiral flow system, a ranges from 0.0027 to 0.0075 and α ranges from 1.10 to 1.27. 3.In both spiral flow systems, the following equation for oxygen transfer economy was satisfied : [numerial formula]4. In a single spiral flow system, the oxygen transfer coefficient per uit power consumption increased with the decrease of h when the oxygen transfer coefficient ranged from 0.1 to 1.5. But when the oxygen transfer coefficient was 2.0,the oxygen transfer coefficient per unit power consumption increased with the increase of h.5. In a double spiral flow systme, the oxygen transfer coefficient per unit power consumption showed a maximum value near the 1.7 meter depth of the diffuser when the oxygen transfer coefficient ranged from 0.1 to 1.5. But it showed a maximum with the decrease of h when the oxygen transfer coefficient was over 2.0. 6. Under the conditions of the maximum oxygen transfer coefficient per unit power consumption, the air flow rate at the fixed K_La value is smaller in a double spiral flow system than in a single spiral flow system when the K_La value ranges from 0.1 to 2.0. But when the K_La value is over 2.0,the air flow rate is smaller in a single spiral flow system than in a double spiral flow system.
公益社団法人日本生物工学会の論文

気泡曝気の曝気性能とその経済性について : "曝気槽の総括酸素移動容量係数算出法とその応用に関する研究(第4報)"

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