供水水库沉积物中铁锰的释放规律研究

在实验室模拟条件下考察了溶解氧、pH值、微生物活性和温度等因素对水库沉积物铁锰释放的影响。结果表明,在缺氧环境中(DO<1.0 mg/L),酸性条件(pH=6.0)能够促进铁锰的释放,而碱性条件(pH=9.0)则会抑制铁锰的释放;微生物活动能够显著促进铁锰的释放;温度对铁锰的释放有较明显的影响,升高温度有利于铁锰的释放;好氧条件下(DO>5.0 mg/L)铁锰的释放则受到明显抑制。

Study on Release of Iron and Manganese From Sediments in a Water- Supply Reservoir

The effects of overlying water dissolved oxygen(DO) concentration,pH,microbial activities and temperature on iron and manganese release from sediments of a water-supply reservoir are investigated under simulated test conditions.Results show that under anaerobic conditions(DO<1.0 mg/L),iron and manganese from sediments releases quickly,but the release is inhabited under aerobic conditions(DO>5.0 mg/L);under anaerobic conditions(DO<1.0 mg/L),compared to neutral conditions(pH =7.5),acidic conditions could promote the release of iron and manganese from sediments,while the release will be inhabited under alkaline conditions;under anaerobic conditions(DO<1.0 mg/L),microbial activities could significantly promote iron and manganese release from sediments.Moreover,the effect of temperature on iron and manganese release is obvious and higher temperature could promote iron and manganese release from sediments.