気泡曝気による旋回流式曝気槽の混合時間と酸素移動性能について : 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6報)

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Effect of air flow rates, diffuser submergences and diffuser locations on the terminal mixing time, t_m were studied in a bench scale spiral flow aeration tank. And in a pilot scale spiral flow aeration tank, these effects on the time required for unifying the dissolved oxygen concentration in a tank, t_m' were studied. 1. The mixing time was usually decreased with the increase of diffuser submergences and the increase of air flow rates in both bench scale and pilot scale aeration tanks. 2. In a bench scale aeration tank, the mixing time was correlated with diffuser submergences and air flow rates, and the following equations were derived : t_m=267.6(G_S/V)^<-0.36> (h)^<-0.44> (single spiral flow) t_m=219.8(G_S/V)^<-0.34> (h)^<-0.44>(double spiral flow) 3. The mixing time of single spiral flow system was smaller than that of double spiral flow system at the same air flow rate and diffuser submergence. 4. In a pilot scale aeration tank, t_m' was represented by the following equation : t_m=0.74×10^<-0.00011MF> where MF=momentum factor (=V_S・G_S/V) The over all xygen transfer coefficient was correlated with t_m : K_La=3.76×10^<-0.88t>m'
公益社団法人日本生物工学会の論文
1975-11-25