Ammonia removal in the catalytic wet air oxygen process of landfill leachates with Co/Bi catalyst.
Ammonia removal in the catalytic wet air oxygen process of landfill leachates with Co/Bi catalyst.
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DOI：
10.2166/wst.2006.853
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发表时间：
2006-10
期刊：
影响因子：
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通讯作者：
Y. Li;L. Liu;G. Huang;L. Zhu
中科院分区：
文献类型：
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作者：
Y. Li;L. Liu;G. Huang;L. Zhu
采用Co/Bi催化剂对垃圾渗滤液中氨的催化湿式氧化进行了研究。用X射线衍射技术对Co/Bi催化剂进行了表征。研究表明，Co/Bi催化剂对垃圾渗滤液中的总有机碳（TOC）和氨氮的去除率分别为99%和98%。结果还表明，在CWAO工艺中除去含氮有机化合物的过程中产生大量的氨，并且氨的进一步氧化在240 ℃下基本上放出N2。当系统温度达到240 ℃以上时，氨氧化速率较高，出水中硝酸盐占主导地位;在反应过程中观察到极少量的亚硝酸根，其可能作为硝酸根离子和分子氮形成的中间体，表明系统温度对氨氧化和产生分子氮的反应选择性具有显著影响，或硝酸盐
Oxidation of ammonia in landfill leachates in the catalytic wet air oxidation (CWAO) process was investigated with Co/Bi catalyst. The characterization of the Co/Bi catalyst was carried out by the X-ray diffraction technique. Studies of ammonia removal from the landfill leachates by CWAO showed that Co/Bi catalyst exhibited higher activities for both total organic carbon (TOC) and ammonia with removal levels of 99% for TOC and 98% for ammonia, respectively. Results also indicated that large amounts of ammonia were produced during the elimination of nitrogenous organic compounds in the CWAO process and the further oxidation of ammonia gave off essentially N2 under 240 degrees C. When the system temperature reached above 240 degrees C, ammonia oxidation rate was much higher with nitrate dominating in the effluent; a very small amount of nitrite was observed in the reaction process, it possibly acts as the intermediate of nitrate ion and molecular nitrogen formation, showing that the system temperature had significant effects on the ammonia oxidation and reaction selectivity towards the production of molecular nitrogen or nitrate.