氧化亚铁硫杆菌对河口底泥中重金属的淋滤效果

从天津某铁厂附近排污河的酸性底泥中成功分离出氧化亚铁硫杆菌菌株,对其形态特征和DNA序列进行了鉴定。运用生物淋滤技术对河口底泥中重金属进行了淋滤实验研究。结果表明,氧化亚铁硫杆菌能够较快速启动生物淋滤,且接种该菌株进行底泥生物淋滤可有效溶出底泥中重金属。最佳淋滤条件为:Fe SO4·7H2O添加量为7 g/L,氧化亚铁硫杆菌的接种量为15%,硫粉添加量为3 g/L,污泥浓度为10%,温度为30℃和硫粉为3 g/L。在最佳淋滤条件下,底泥中Cu、Zn和Hg的去除率分别达到80.6%、63.9%和82.5%。

BIOLEACHING OF HEAVY METALS IN ESTUARINE SEDIMENT BY THIOBACILLUS FERROXOIDANS

A strain of Thiobacillus ferrooxidans ( T． f) was successfully isolated from the acidic sediment of a pyrite mine in Tianjin． And the strain was identified by its morphology and DNA sequence． Moreover，the paper researched bioleaching of heavy metals in estuarine sediment． The results demonstrated that T． f could start bioleaching quickly and heavy metals could be removed efficiently by bioleaching technology． And with 7 g /L of ferrous sulfate，15% of sludge-inoculation ratio，30 ℃ of temperature，and 3 g /L of sulfur，the maximum removal efficiencies of Cu，Zn and Hg were 80. 6%，63. 9% and 82. 5% respectively．