Study On Culture Conditions, MCs Degradation Conditions Of Stenotrophomonas Acidaminiphila And Synergy Between Stenotrophomonas Acidaminiphila And Microccus Lutes

With Stenotrophomonas acidaminiphila as the main object, this paper inquires into optimization of culture conditions and microcystins degradation conditions of Stenotrophomonas acidaminiphila, synergy between Stenotrophomonas acidaminiphila and Microccus lutes, in order to provide basic research and material for microcystins biodegradation.The opimum culture conditions of Stenotrophomonas acidaminiphila are 30℃, pH 6.5~7.5, inculation 1%~5%, rotate speed 150 rpm. The opimum microcystins-degrading conditions are 30℃~35℃, pH 7.0~7.5, inculation quantity 0.5%~5%, rotation rate 150 rpm~180 rpm. Under these conditions, Stenotrophomonas acidaminiphila could degrade 15.4 mg/L MCs completely in 5 days. The experiment results of mutual effect between different bacterial strains demonstrate that Stenotrophomonas acidaminiphila and Microccus lutes have specific synergism. When bacterial strains number proportion of Stenotrophomonas acidaminiphila to Microccus lutes is 1: 2, MCs degradation of mix bacteria is the highest. The probable synergistic mechanism between Stenotrophomonas acidaminiphila and Microccus lutes is that some middle metabolic products of Microccus lutes provide nutrition for Stenotrophomonas acidaminiphila in the growing process, so the MCs degradation ability of Stenotrophomonas acidaminiphila enhanced.Therefore, Stenotrophomonas acidaminiphila has a great application potential for governing microcystins pollution.