垃圾渗滤液主要组分的催化湿式氧化降解

利用Mn/Ce复合氧化物催化剂对“年老”垃圾渗滤液主要组分正己酸、正丁酸、乙酸及氨氮进行催化湿式氧化(CWAO)降解,分析了CWAO降解过程中有机酸之间及氨氮与有机酸之间的关系.结果表明,CWAO可降解垃圾渗滤液中正己酸、正丁酸、乙酸,反应进行120min时TOC去除率均达90%以上.降解乙酸、正丁酸和正己酸混合溶液时,升温过程出现有机酸相互抑制降解现象.氨氮的存在导致正丁酸的降解率下降,而有机酸的存在也抑制了氨氮的降解.Ni2+可使催化剂中毒,使催化剂活性降低.

Catalytic wet air oxidation of main components of landfill leachate

Mn/Ce compound oxides catalyst was employed to decomposition of main components (such as n-hexanoic, n-butyric, acetic acids and ammonia nitrogen) in old landfill leachates by catalytic wet air oxidation (CWAO), and then the interaction between organic acids and ammonia nitrogen was discussed during the oxidation process.The main components in old landfill leachates were decomposed (>90% in 120min) by CWAO, and the inhibition between n-hexanoic, n-butyric and acetic acids was observed for the degradation of organic acids mixtures during the temperature-rising stage in CWAO. Furthermore, the degradation rate of n-butyric acid decreased when ammonia nitrogen present and n-butyric acid also inhibited decomposition of ammonia nitrogen in CWAO. Ni2+ could lead the catalyst to poison, and restrained catalytic activity of the catalyst.