• 关键词：生态滤床  重金属  地表水体  生态修复

• 基金项目：国家重大科技专项资助项目(No.2009ZX07212-001-03)

• 池年平
• 1. 同济大学环境科学与工程学院, 上海 200092; 2. 同济大学污染控制与资源化研究国家重点实验室, 上海 200092

• 罗文连
• 中南林业科技大学资源与环境科学学院, 长沙 410004

• 廖熠
• 四川理工学院, 自贡 643000

• 董秉直
• 1. 同济大学环境科学与工程学院, 上海 200092; 2. 同济大学污染控制与资源化研究国家重点实验室, 上海 200092

• 摘要：以蛭石为滤床基质,研究了复合生态滤床对受重金属污染地表水体的修复效能.结果表明,复合生态滤床对重金属污染水体有较好的处理效果,在水力负荷为2.0m³·m^-2·d^-1时,系统对Cu、Zn、Pb和Cd的平均去除率分别达到81.60%、80.55%、83.20%、62.21%;按照国家《地表水环境质量标准》(GB3838-2002),出水重金属浓度达到Ⅱ类水质标准;出水COD值为9.7～38.3mg·L^-1,达到Ⅰ类水质标准;出水NH₄⁺-N达到1mg·L^-1以下,达到Ⅲ类水质标准.滤床基质中铜离子含量稳定在30mg·kg^-1左右,表明植物根系可以有效地吸收蛭石吸附的重金属,从而有效提高蛭石的再吸附能力,延长滤床工作周期.

• Abstract：The function of a complex ecosystem filter bed (CEFB) with vermiculite substrate for restoration of surface water contaminated by heavy metals was investigated. Experimental results showed that the CEFBwas highly effective in removal of heavy metals and the average removal rates of Cu²⁺,Zn²⁺,Pb²⁺ and Cd²⁺ were 81.60%,80.55%,83.20% and 62.21% respectively,under a hydraulic loading of 2.0 m³·m^-2·d^-1. The effluent concentration of heavy metals,CODand NH₄⁺-Ncomplied with the water quality standards of grade Ⅲ respectively,according to the Chinese Standard of Surface Water Environment Quality (GB3838-2002). The concentration of Cu²⁺ was stable at about 30 mg·kg^-1,which suggested that the heavy metal assimilated by vermiculite substrate could be absorbed by plant roots. Thus the adsorption capacity of vermiculite was effectively improved,as well as the work cycle of the CEFB.

• Key words：complex ecosystem filter bed  heavy-metal  surface water  ecological restoration

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