解脂假丝酵母对重金属工业废水的吸附特性

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Abstract

The biosorption of simulation wastewater with coexisted Cr(Ⅵ),Ni(Ⅱ) and Cu(Ⅱ),and three kinds of actual wastewaters by Candida lipolytica was investigated.The results showed that initial pH,contact time and biosorbent dosage were the major influencing factors.Research on the dynamics reflected that the biosorption complied with both the first-order and the second-order kinetic models,and the second-order kinetic models had higher correlation coefficients,confirming that the biosorption process included multiple steps and chemical adsorption was the rate-determining step.After the wastewater containing 18.7-37.86 mg·L^-1 of Cr,2.39-9.21 mg·L^-1 of Cu,2.27-9.87 mg·L^-1 of Ni and 0.43-1.32 mg·L^-1 of Zn was absorbed with 1 g·L^-1 biosorbent for 120 min,the biosorption rates on the above metals were 81.6%-84.6%,84.0%-100%,84.1%-100% and 93.9%-100%,respectively.The results suggested that C.lipolytica was an effective strain to remove combined pollutants from aqueous solution.Moreover,proteins,lipids and carbohydrates of the biosorbent participated in the binding of these heavy metals.The main functional groups were -OH,-NH₂,-CH₂,-CH₃,-COOH,-CHO,C=C,-PO₄^3- and -SO₃H.

Key words： Heavy metals biosorption Candida lipolytica

Received: 25 October 2011

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	YE Pei-qing
	TAN Xiao

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YE Pei-qing,TAN Xiao. Biosorption of wastewater containing heavy metals by Candida lipolytica[J]. , 2011, 30(5): 541-546.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2011/V30/I5/541

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