Ammonium nitrogen of effluent exceeded the standard in small urban sewage treatment plant, so effect of hypochlorite oxidation on ammonium nitrogen removal was investigated in both laboratory experiment and pilot test. Results indicated that NH4^＋ decreased to 7.85mg/L and 2.99 mg/L when the dosages of sodium hypochlorite and calcium hypochlorite were 1.4 g/L and 1.6 g/L, and further increase in dosage of oxidants could enhance the removal efficiency of NH4^＋. Pilot test confirmed the feasibility of this process in NH4＋ removal, NH4^＋ decreased to 4.7 mg/L, 1.27 mg/L and 0.43 mg/L, when the dosages of calcium hypochlorite were 300, 400 and 500 mg/L. Ammonium concentration of effluent could reach the class one of＂discharge standard of water pollutants＂ in Beijing （DB11/307-2005）.%本研究针对小型污水处理厂氨氮超标问题，对次氯酸盐氧化法去除氨氮的可行性进行了小试实验研究和中试验证。结果显示，当在姿霉酸塑警加兰竺次氯酸钙的投加量分别为1．4g／L和1．6g／L的条件下，污水中氨氮浓度可以降至7．85和2．99mgm，继续增加氧化剂投加量可以进一步增强氨氮的去除效果。中试确认了该技术的可行性，当次氯酸钙投加分别为300，400，500mg／L时，出水氨氮可以低至4．7，1．27，O．43mg／L。出水可以达到北京市地方污水排放标准（DBl1／307—2005）~…级标准。
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