摘要： 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。

关键词: 硝酸盐氮, 还原性铁粉, 氨氮, 次氯酸钠

Abstract: 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.

Key words: nitrate nitrogen, reducing ferrous powder, ammonia nitrogen, sodium hypochlorite

中图分类号: 

• X703.1