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铜-苯并[a]芘复合污染体系中铜的微生物吸附特性

Keywords: ,苯并[a]芘,微生物吸附,嗜麦芽窄食单胞菌

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Abstract:

研究了铜-苯并a芘(BaP)复合污染体系中,嗜麦芽窄食单胞菌对铜的微生物吸附特性。实验结果表明,该菌可以选择性地吸附Cu2+,并把NO-3还原为NO-2,pH、投菌量、处理时间和铜浓度等因素及BaP均会对铜的生物吸附产生显著的影响,BaP和这4个因素的相互作用对铜的生物吸附也达到了显著的水平。投菌量会对铜吸附过程中F-、Cl-、NO-2、NO-3、PO3-4和SO2-4等离子的释放产生显著的影响,BaP则会显著的影响F-、NO-2、NO-3和PO3-4的浓度水平。当BaP的浓度为0、0.1、1.0、10.0mg·L-1时,2.5g·L-1菌体对pH为6.0、浓度为2mg·L-1的铜溶液的吸附率分别高达97.1%、93.8%、94.0%和93.3%。BaP和铜在2h内均没有造成菌体表面形态的明显变化;处理10mg·L-1Cu2+及其与BaP的复合污染2d后,菌体表面会产生突起结构。

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