化学沉淀工艺去除高浓度氨氮反应机理及试验研究  

Study on Reaction Mechanism and Experiment of High Concentration Ammonia Nitrogen Removal by Chemical Precipitation

作　　者：童庆[1] 王浩明[1] 孙礼明[1] 

机构地区：[1]合肥水泥研究设计院,安徽合肥230051

出　　处：《环境科学与管理》2009年第8期86-89,共4页Environmental Science and Management

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.

关 键 词：化学沉淀 氨氮 反应机理 

分 类 号：X705[环境科学与工程—环境工程]