摘要
采用磷酸铵镁(MAP)法去除垃圾渗滤液中的高浓度氨氮,对影响氨氮去除率的各个因素进行了研究。结果表明,MgCl2与K2HPO4的组合对氨氮去除效果最好,各因素对氨氮去除率的影响为磷氮比(以摩尔比计,镁氮比同)>初始pH>搅拌时间>搅拌速率>镁氮比。通过单因素试验得到MAP法的适宜条件:磷氮比1.2,初始pH 9.50,搅拌时间4min,搅拌速率100r/min,镁氮比1.1,此时氨氮的去除率可达90%左右。在此条件下,获得的MgNH4PO4.6H2O(即鸟粪石)沉淀具有良好的沉降性能和脱水性能,出水pH在7.2～7.4。对经MAP法预处理的垃圾渗滤液出水进行一段时间的生物处理,工艺运行稳定,不存在曝气孔堵塞问题。
The magnesium-ammonium-phosphate（MAP） precipitation was used to treat high ammonia landfill leachate.The factors which effected ammonia nitrogen removal were investigated.Results showed that the combination of K2HPO4 and MgCl2 exhibited the highest nitrogen removal performance;the effect of different influencing factors followed the order of P∶N molar ratioinitial pHstirring timestirring rateMg∶N molar ratio.The suitable operating conditions were obtained through single factor experiment,they were P∶N molar ratio of 1.2,initial pH of 9.50,stirring time of 4 min,stirring rate of 100 r/min and Mg∶N molar ratio of 1.1.Under these optimum conditions,the removal rate of ammonia nitrogen could reached to about 90%.The obtained struvite precipitation had perfect settling and dewatering property,the effluent pH ranged 7.2-7.4.The effluent was treated by following bioprocess,the reactor operated stable with no problem of blocking.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2013年第7期31-35,共5页
Environmental Pollution & Control
基金
国家"863计划"项目(No.2009AA062902)
中央高校基本科研业务费专项资金资助项目
上海市曙光跟踪计划课题(No.10GG12)
关键词
磷酸铵镁法
垃圾渗滤液
正交试验
影响因素
magnesium-ammonium-phosphate
landfill leachate
orthogonal experiment
influencing factors
