2段曝気活性汚泥法による含シアン廃水の生物学的処理 : 含シアン廃水の生物学的処理に関する研究(第3報)

概要

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A two stage activited sludge process using a cyanide resistant bacterium for teratment of waste water containing cyanide was examined. The activited sludge in the first aeration tank showed similar pattern of cytochromes to the cyanide resistant bacterium and that in the second aeration tank was similar to sludge developed in a plant for sewage treatment. The activated sludge in the second aeration tank was relatively sensitive to cyanide compared with that in the first aeration tank. The reaction kinetics for cyanide degradation were of zero order in the first aeration tank. Under restricted oxygen supply, cyanide degradation was limited by the amount of oxygen and the ratio of oxygen consumption for degradation of cyanide was 0.375 O_2-mole/CN^--mole. Under sufficient oxygen supply, the ratio was 1.2 O_2-mole/CN^--mole and cyanide degradation activity was 0.15_-0.2 CN^-kg/m^3/day. In the second aeration tank, cyanide degradation was inhibited by the increasing amount of cyanide and the inhibition was reversible. The addition of rice an appropriate amount of bran as a nutrient was effective in maintaining the stability of the activated sludge process.
公益社団法人日本生物工学会の論文
1975-11-25