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为了探讨极端嗜热菌在高铁、高酸和高温条件下生物脱硫的可行性,采用从腾冲热海酸性温泉分离出的一株新型极端嗜热硫杆菌开展了四组不同初始pH值条件下的黄铁矿生物柱浸实验.该菌株能耐受pH值为0.58、全铁质量浓度为38.9 g.L 1的高酸高铁环境,同时维持580～640 mV的较低电位.初始pH值为2时,浸出28 d后黄铁矿浸出率达到最高为17.8%.生物浸出时,菌株生长依次表现出较明显的迟缓期、对数期和稳定期,且降低初始pH值会延长其到达稳定期的时间.此外,70℃高温和全铁质量浓度为38.9 g.L 1的高铁体系能促进生成黄钾铁矾和少量单质硫沉淀,而菌株能在pH值小于0.9时将大部分S0氧化为SO24.
In order to investigate the feasibility of bio-desulfurization of Thermophilic bacterium under high-speed rail, high acid and high temperature, a new strain of Thermobacterium thermophilum isolated from Tengchong Atherty Hot Springs was used to study the effect of four different initial pH values Pyrite bio-leaching experiment.The strain was able to tolerate a high acid and high iron environment with a pH of 0.58 and a total iron concentration of 38.9 gL 1, while maintaining a low potential of 580-640 mV.At the initial pH value of 2, After leaching for 28 days, the leaching rate of pyrite reached the highest value of 17.8% .Biological leaching, the strain growth showed more obvious retardation, logarithmic and stable period, and reduce the initial pH value will extend the time it reaches the stable period In addition, the high-iron system with high temperature of 70 ℃ and total iron concentration of 38.9 gL 1 promoted the formation of jarosite and a few elemental sulfur precipitates, while the strain could oxidize most of the SO2 to SO24 at pH values less than 0.9.