污染控制技术及原理
李中华,尹华,叶锦韶,彭辉,秦华明,何宝燕,张娜.固定化菌体吸附矿山废水中重金属的研究[J].环境科学学报,2007,27(8):1245-1250
固定化菌体吸附矿山废水中重金属的研究
- Biosorption of heavy metals from mine wastewater by immobilized bacteria
- 基金项目：国家自然科学基金(No.50278040);广东省重大科技专项(No.2004A30308002)
- 作者
- 单位
- 李中华
- 暨南大学环境工程系, 广州 510632
- 尹华
- 暨南大学环境工程系, 广州 510632
- 叶锦韶
- 暨南大学环境工程系, 广州 510632
- 彭辉
- 暨南大学环境工程系, 广州 510632
- 秦华明
- 暨南大学环境工程系, 广州 510632
- 何宝燕
- 暨南大学环境工程系, 广州 510632
- 张娜
- 暨南大学环境工程系, 广州 510632
- 摘要：研究了固定化菌体对矿山废水重金属的吸附性能.结果表明,固定化菌体对重金属有良好的富集性能,投加15g·L-1的固定化菌体,对100mg·L-1Cu、50mg·L-1Zn的去除率分别可达94.4%、80.6%.废水pH、菌体投加量对固定化菌体的处理效果影响较大,其最佳值分别为3·5、15g·L-1.经4轮吸附-解吸循环实验,显示固定化菌体可重复利用3次,固定化菌体在使用第3次时,对100mg·L-1Cu、50mg·L-1Zn的去除率分别为67.4%、46.5%.用固定化菌体的流化床工艺处理废水最佳参数为曝气量4.02L·min-1,处理2h.用固定化菌体的流化床工艺处理矿山废水取得了较好的效果,对于浓度低于10mg·L-1的重金属,去除率达到了100%,对浓度为579.2mg·L-1Fe的去除率也达到了56.6%,表明该工艺具有较好的工业化前景.
- Abstract：The utility of immobilized bacteria as a biosorbent for heavy metals from mine wastewater was investigated. The experimental results showed that heavy metals could be efficiently accumulated by the immobilized bacteria with removal efficiencies of 94.4% and 80.6% for 100 mg·L-1 Cu and 50mg·L-1 Zn, respectively, at a strain dose of 15g·L-1. The biosorption efficiency was strongly influenced by the pHof the mine wastewater (optimal pH3.5) and strain dose (optimal value 15 g·L-1). Immobilized bacteria regeneration studies were carried out over four sorption-desorption cycles. Removal efficiencies of 67.4% and 46.5% for 100 mg·L-1 Cu and 50mg·L-1 Zn were still attained in the third cycle. An immobilized bacteria based fluidized bed technique was developed to handle the mine wastewater. Optimal operation conditions for the fluidized bed were 4.02L·min-1 aeration and 2h treatment time. The immobilized bacteria fluidized bed effectively treated mine wastewater, removing 100% of all heavy metals with concentrations lower than 10mg·L-1 and 56.6% of Fe, initially present at 579.2mg·L-1, thus this process is a promising technique for future applications.
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