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针对氢气作为电子供体的硫酸盐生物还原速率缓慢的问题,采用附加直流电的方式强化。体系最佳电流强度为1.50mA,平均还原速率是微生物单独作用的1.7~2.1倍。当还原速率小于10m g/d时,氧化还原电位(ORP)值分布在0~-500mV,与硫酸盐还原效应之间的响应规律不明显。当还原速率为10~50m g/d时,ORP分布在-350~-450mV的较窄范围,表明ORP<-350mV时,ORP不再是影响还原速率的主要因素。pH为8~9.5、ORP为-350~-450mV为本研究体系硫酸盐还原的优势场。
The problem of the slow rate of bioreduction of sulphate for hydrogen as an electron donor is enhanced by the addition of direct current. The best current density of the system is 1.50mA, and the average reduction rate is 1.7 ~ 2.1 times that of the microorganism alone. When the reduction rate is less than 10 m g / d, the redox potential (ORP) is distributed in the range of 0-500 mV, and the response to sulfate reduction is insignificant. When the reduction rate is 10-50 m g / d, ORP distribution is in the narrow range of -350-450 mV, indicating ORP is no longer the main factor affecting the reduction rate when ORP <-350 mV. The pH of 8 ~ 9.5, ORP of -350 ~ -450mV is the dominant field of sulfate reduction in this study.