[Effect of Mn2+ on pyrene degradation by Flavobacterium sp. FCN2].

Mn~(2+) concentration affecting polycyclic aromatic hydrocarbon pyrene degradation by the Flavobacterium sp.FCN2 was investigated by adding Mn~(2+) during several periods,which including bacteria cultivation period,bacteria degrading pyrene and enzymatic degradation period.Results show the concentration of Mn~(2+) was beneficial for pyrene degradation,and Mn~(2+) was no influential to bacteria growth and magnitude.When Mn~(2+) was added during culturing strain FCN2 period,bacteria FCN2 can enrich Mn~(2+),and pyrene removal efficiency by Mn~(2+) enrichment bacteria is 1.26 times more than that of without Mn~(2+) enrichment bacteria.As well as the situation that adding Mn~(2+) during FCN2 degrading pyrene period that pyrene removal efficiency is 1.67 times more than that of without Mn~(2+).And when adding Mn~(2+) during enzymatic degradation periods,the elimination efficiency of pyrene was 1.30 times more than that of without Mn~(2+).