硫化物矿山尾矿生物氧化作用的抑制研究

Study on the inhibition of biological oxidation in sulfide tailings

硫化物矿山尾矿的风化、氧化会对周围环境产生危害,研究表明,以氧化亚铁硫杆菌为代表的嗜酸氧化菌起了非常重要的作用。本研究以从广东韶关大宝山尾矿分离得到的一株氧化亚铁硫杆菌作为实验菌株,添加不同剂量的杀菌剂,分析了杀菌剂对溶液pH、Eh值的影响,及杀菌剂的Fe2+氧化抑制率和最佳使用浓度。结果显示:实验用杀菌剂SDS和CTAB能有效地抑制金属硫化物尾矿的生物氧化和酸化:ρ(SDS)为30 mg/L时Fe2+的氧化抑制率达到82.83%;ρ(CTAB)为5 mg/L时Fe2+的氧化抑制率达到80.84%,添加了杀菌剂的溶液pH、Eh基本保持初始值不变,表明杀菌剂的使用可以控制金属硫化物尾矿的酸化污染。

The decomposition of multi-metal mine tailings results in some environmental problems and disasters,studies show that acidophilic bacterias,represented by Thiobacillus ferrooxidans,play an important role in the process of decomposition of minerals.The inhibitation of Fe2＋ oxidation was analyzed by adding different doses of bactericides into the solution of purified Thiobacillus ferroxidans.The effects of two bactericides,SDS and CTAB in inhibition of Thiobacillus ferroxidans in mineral tailings,were researched.The lab experiment showed that both bactericides（SDS and CTAB） are effective in inhibiting the activity of Thiobacillus ferroxidans.The inhibition rate of controlling Fe2＋ oxidation is 82.83% with SDS at the concentration of 30 mg/L,and that of CTAB is 80.84% at the concentration of 5 mg/L.Bactericide technology can be used to control the acidification of sulfide tailings pollution and promote ecological reconstruction.