表面活性剂对白腐真菌降解多环芳烃的影响

研究了4种表面活性剂吐温80(Tween80)、曲拉通100(Trition X-100)、十二烷基苯磺酸钠(LAS)、十二烷基硫酸钠(SDS)对白腐真菌降解水溶液和土水系统中多环芳烃(PAHs)的影响.结果表明,表面活性剂的类型、浓度、PAHs的赋存状态以及体系pH值、温度等均影响着PAHs的降解.在水溶液中(无土),加入4种表面活性剂均降低溶液中PAHs的降解.在土水系统中,Trition X-100和SDS抑制PAHs降解,而Tween80和LAS对PAHs的影响则受到浓度的影响.低浓度Tween80和LAS对土壤中PAHs的降解没有促进作用,甚至有微弱的抑制作用,但适当浓度的Tween80和LAS促进PAHs降解,并且对土壤中PAHs降解的促进作用随着浓度的增大而逐渐增大,但过高浓度的Tween80和LAS没有表现出对PAHs降解更大的促进作用.

Effect of Surfactants on Biodegradation of PAHs by White-Rot Fungi

The impacts of surfactants(Tween80,Trition X-100,LAS and SDS) on PAHs degradation by white-rot fungi in aqueous system and soil-water system were studied.Results show that the type and concentration of surfactants,PAHs statues,pH value of the systems and temperature have impacts on the degradation of PAHs.In aqueous system,all the four surfactants restrained the degradation of PAHs.In soil-water system,Trition X-100 and SDS restrained the degradation of PAHs,while the impacts of Tween80 and LAS on PAHs degradation were influenced by the concentration of the surfactants.Low concentration Tween80 and LAS didn't promote the degradation of PAHs,and even played minor effects of restrain.But the degradation of PAHs could be enhanced with the increasing of the concentrations of Tween80 and LAS to certain levels.However,Tween80 and LAS with significant higher concentrations didn't show higher abilities on the promotion of PAHs degradation.