从铅锌矿渣中分离的微生物对重金属吸附特性的研究  

Absorption of Heavy Metals by Microorganisms Isolated from Lead-zinc Tailing

作　　者：张汉波[1] 王力[1] 沙涛[1] 程立忠[1] 

机构地区：[1]云南大学生物学系,云南昆明650091

出　　处：《微生物学杂志》2004年第5期34-37,共4页Journal of Microbiology

基　　金：云南省自然科学基金项目 ( 2 0 0 2C0 0 0 1Q);云南省教育厅自然科学基金重点项目 ( 0 2ZD0 13 );云南省工业微生物发酵工程重点实验室开放基金 (KF -2 0 0 10 0 1)

摘　　要：从铅锌矿渣中分离到 16种菌 (包括 7株细菌和 9株真菌 ) ,并研究了它们对Zn2 + ,Pb2 + ,Cu2 + 的吸附特性。发现大多数菌株对Pb2 + 与Zn2 + 有不同程度的吸附 ,但对Cu2 + 的吸附能力较小。菌株对Zn2 + 的吸附率大于对Pb2 + 的吸附 ,能吸附Pb2 + 的菌株也能吸附Zn2 + 。pH 4～ 6是真菌吸附金属离子的较好范围 ,细菌仅在pH =5 .0条件下 ,对Pb2 + 与Zn2 + 有吸附。在测试的不同金属离子浓度范围内 (5 0mg/L <Pb2 + <70 0mg/L ,2 0mg/L <Zn2 + <32 0mg/L) ,真菌对Pb2 + ,Zn2 + 的吸附率随离子浓度的增加而增加 ,但细菌仅在一定的浓度值以下 (Pb2 + <10 0mg/L ,Zn2 + <80mg/L)表现吸附率增加。真菌 2个菌株的吸附率随时间变化的规律表明 ,菌株对金属离子的吸附符合“吸附 +细胞膜传输”模型。High absorption ability of lead, zinc and copper by 7 strains of bacteria and 9 strains of fungi isolated from lead-zinc tailing was characterized. It showed that most of these microorganisms have absorption ability of Pb{2} and Zn{2}, and relatively more Zn{2} could be absorbed than Pb{2}. On the other hand, only a few of strains could absorb Cu{2} with low ability. Strains with excellent absorption of Pb{2} and Zn{2} were selected to test their absorption ability at different pH and different concentrations of Pb{2} and Zn{2}. The results showed that, for fungi, the most optimistic pH for absorption is 4～6, but for bacteria the optimrstic is 5.0. The absorption ability of fungi was enhanced by increased concentration of metals (50mg/L<Pb{2}<700mg/L,20mg/L<Zn{2}<320mg/L), and bacteria also showed the same response under a lower concentration of metals (Pb{2}<100mg/L,Zn{2}<80mg/L). The absorption changes to the absorption time demonstrated that, absorption of Zn{2} and Pb{2} ions occurred in two processes: rapid absorption on cells surface and slow transportation into cells.;

关 键 词：重金属 生物吸附 铅锌矿渣 

分 类 号：X172[环境科学与工程—环境科学]