摘要
某城市垃圾填埋场渗滤液氨氮平均浓度高达2100 mg/L。通过比较,采用工业级MgO和H3PO4为沉淀剂与渗滤液中的氨氮反应,生成磷酸铵镁(MAP)沉淀,探讨了其化学反应机理。通过正交试验方法,研究了不同操作条件对氨氮去除效率的影响。试验结果表明,在pH=8.25,n(Mg2+):n(PO43-):n(N)为1.35:1.20:1.00,反应与沉淀时间均为15 min条件下,原水氨氮去除率>96%,此法对渗滤液中COD也取得了18%的平均去除率,减轻了后续生化处理的压力。
The average concentration of ammonia nitrogen landfill leachate was high about 2 100 mg/L. By comparison, magnesium ammonium phosphate（MAP） precipitate was formed in the treatment of ammonia nitrogen from leachate via the reaction of industrial MgO and H3 PO4. The mechanism of chemical reaction was explored. The effects of different operating conditions on the removal rate of ammonia nitrogen were examined though orthogonal technical processing. The experiment results showed that when the leaehate pH was 8. 25, the mol ratio of Mg^2＋ ：PO3^4- ：N was 1.35：1.20：1.00,and the reaction ＆ precipitating time were 15 min, the removal rate of ammonia nitrogen and COD from leachate sample were over 96% and 18%, reducing the press of the following bio- chemical treatment highly.
出处
《环境科学与管理》
CAS
2009年第8期86-89,共4页
Environmental Science and Management
关键词
化学沉淀
氨氮
反应机理
chemical precipitation
ammonia nitrogen
chemical precipitation
