试验探究了Fe0+NaClO处理低浓度硝酸盐氮废水的可行性.考察了pH、温度、Fe2+浓度、Fe0投加量和初始NO3-浓度对Fe0还原硝酸根的影响以及NaClO投加量对Fe0和NO3-的还原产物NH4+去除效果的影响.试验结果表明,当NO3-初始质量浓度为50 mg/L、pH=2时,投加10 g/L Fe0,50℃恒温反应2 h后,再投加300 mmol/L的NaClO,可使出水NO3-低于5 mg/L,NH4+低于2 mg/L.%The feasibility of the combined process,zero-valent iron+sodium hypochlorite for treating the wastewater containing low content of nitrate nitrogen has been investigated,and the influences of pH,temperature,Fe2+ concentra-tion,the dosage of Fe0 and initial nitrate concentration on the reduction of nitrate radical by zero-valent iron,as well as the influence of NaClO dosage on the removing effect of Fe0 and NO3-reduction product NH4+have been researched. The experimental results show that when the initial mass concentration of NO3-is 50 mg/L,and pH=2,after 10 g/L of zero-valent iron is added,at constant temperature 50℃and reaction time 2 h,and then 300 mmol/L of NaClO is added again,the effluent NO3-concentration can be less than 5 mg/L and effluent NH4+concentration less than 2 mg/L.
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