含シアン廃水処理における活性汚泥のシアン適応 : 含シアン廃水の生物学的処理に関する研究(第5報)

概要

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The adaptation process in activated sludge treatment of waste water containing cyanide was studied.The autolysis rate of cyanide-degrading enzyme was smaller than that of other enzymes in the presence of cyanide. Therefore, cyanide degradation activity per unit biomass increased during the adaptation period. On the other hand, the increase of cyanide degradation activity with rice bran addition was greater in the presence of cyanide than in its absence. By this process, the adaptatioin of activated sludge to cyanide proceeded.In the first aeration tank, the cyanide degradation rate fluctuated with time, but the Michaelis coefficient K_m for cyanide was constant and only V_<max> changed. It was judged that the change in cyanide degradation rate was caused by change in the amount of cyanide-degrading enzyme.Using agar medium or medium contained in a Chambeland filter tube it was possible to separate two of clusters of microorganisms from the first aeration tank. On type seemed to favour cyanide, the other rice bran. These two populations were coexistent in the first aeration tank. The population of microorganisms in the aeration tank changed in three days on addition of rice bran in the absence of cyanide.
社団法人日本生物工学会の論文
1976-09-25