丝状菌对生物淋滤去除底泥中重金属的促进作用  

Promotion effect of filamentous bacteria on removal of heavy metals during bioleaching from contaminated sediment

作　　者：谭险夷[1,2] 袁兴中[1,2] 曾光明[1,2] 周梅芳[1,2] 蒋敏[1,2] 李鹏[1,2] 

机构地区：[1]湖南大学环境科学与工程学院,长沙410082 [2]湖南大学环境生物与控制教育部重点实验室,长沙410082

出　　处：《环境工程学报》2010年第12期2853-2859,共7页Chinese Journal of Environmental Engineering

基　　金：国家水体污染控制与治理重大专项(2009ZX07212-001-02)

摘　　要：利用氧化亚铁硫杆菌（Acidithiobacillus ferrooxidans,A.f）对采自株洲霞湾港底泥中的Cu、Cd、Pb和Zn 4种重金属进行生物淋滤实验,在实验中加入丝状菌考察其对重金属去除效果的影响。结果表明,丝状菌可以有效抑制低分子量有机酸对A.f的毒害作用,促进各种重金属的去除。当加入10%（体积比）的丝状菌后,生物淋滤过程中系统pH值在5 d内降低到2以下,Fe2＋在4 d内完全氧化。经过10 d的处理,Cu、Cd、Pb和Zn 4种重金属的最高去除率分别达到76.3%、92.5%、52.6%和88.5%,与不加入丝状菌的处理相比,达到最大去除率所需的时间缩短1~2 d,4种重金属中,丝状菌的加入对Pb的去除促进作用最为明显,其去除率增加1倍左右。因此,在生物淋滤处理重金属-有机物复合污染底泥工艺中接入丝状菌对处理效果有很好的促进作用。The effect of co-inoculation of Acidithiobacillus ferrooxidans（A.f） and filamentous bacteria on the solubilization efficiency of Cu,Cd,Pb,Zn four kinds of heavy metals by bioleaching was studied in experiments.The results showed that bioleaching with the filamentous bacteria alleviated the inhibiton effect of low molecular weight organic acids on A.f and improved the solubilization efficiency of heavy metals.With 10% inoculum containing filamentous bacteria,pH of the sediment declined continuously down to 2.0 or less in 5 days and ferrous iron was completely oxidized in 4 days.Removal efficiencies of 76.3% for Cu,92.5% for Cd,52.6% for Pb,and 88.5% for Zn were obtained after 10 days of bioleaching.The period of bioleaching could be shortened by 1～2 days.As the removal efficiency increased by nearly 100 percent,the promotion effect on leaching out of Pb was the most evident in all four kinds of heavy metals.Hence,it is feasible that the filamentous bacteria might be used for bioleaching of sediment polluted by heavy metals-organics complex.

关 键 词：丝状菌 低分子量有机酸 重金属 生物淋滤 底泥 

分 类 号：X705[环境科学与工程—环境工程]