双金属-湿式氧化法去除垃圾渗滤液膜滤浓缩液中无机氮  

Total Nitrogen Removal from High-salinity Wastewater by Zn-Cd Bimetal/WAO Coupling Method

作　　者：汪诗翔 岳分 刘燕兰[1] 刘咏[1,2] 

机构地区：[1]四川师范大学环境科学与工程系,四川成都610066 [2]四川省高校特种废水处理重点实验室,四川成都610066

出　　处：《水处理技术》2017年第1期62-66,71,共6页Technology of Water Treatment

基　　金：四川省教育厅重点项目(15ZA008);成都市科技局项目(2014-HM01-00211-SF);四川师范大学生横向课题(02476905);四川师范大学研究生优秀论文培育基金(20160431)

摘　　要：针对垃圾渗滤液膜滤浓缩液中高含量的NO_3^--N、NO_2^--N及NH_4^+-N同时存在的水质特点,采用Zn-Cd初步还原-湿式氧化法(WAO)深度除氮法(2步法)去除其中的无机氮。以模拟浓缩液为研究对象,探讨了3种形态的无机氮在处理过程中的转化规律及其影响因素,并将该方法用于实际浓缩液的处理。结果表明,通过Zn-Cd双金属使废水中的NO_3^--N转化为NO_2^--N,通过WAO作用使体系中的NO_2^--N与NH_4^+-N转化为氮气的方式可将废水中的3种无机氮有效去除。在适宜的条件下,该方法可将体系中97.10%的NO_3^--N转化为NO_2^--N;体系中的NO_2^--N和NH_4^+-N在WAO阶段的去除率分别达到99.03%和69.23%。将该方法用于实际浓缩液的处理时,其无机氮的总去除率达到72.00%以上。Based on the water quality characteristics of landfill leachate membrane concentrates, the Zn-Cd bimetal/WAO coupling method was used to remove inorganic nitrogen （nitrate, nitrite, ammonia） from the membrane concentrates. The batch experiments of model wastewater have been conducted to investigate the transformation of inorganic nitrogen and its influence factors during the treatment. This method was also used for membrane concentrates denitrification process. The results showed that nitrate could be effectively reduced to nitrite by Zn-Cd bimetal. The inorganic nitrogen could be removed from wastewater by forming N2 at WAO stage. The 97.10% nitrate was reduced to nitrite by Zn-Cd bimetal, the nitrite removal of 99.03% and ammonia removal of 69.23% were attained under optimal experimental conditions. The inorganic nitrogen removal above 72.00% was achieved when membrane concentrates were treated by this method.

关 键 词：垃圾渗滤液膜滤浓缩液 湿式氧化法 Zn-Cd双金属 脱氮 

分 类 号：X703.1[环境科学与工程—环境工程]