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Co/Bi催化剂催化湿法氧化降解垃圾渗滤液中的氨氮

Catalytic Wet Air Oxidation of Ammonia in Landfill Leachates in the Presence of Co/Bi Catalyst

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【作者】 李鱼张荣李海生董德明刘亮刘光辉刘鸿亮

【Author】 LI Yu1\+*, ZHANG Rong1, LI Hai-Sheng2, DONG De-Ming1, LIU Liang1, LIU Guang-Hui1, LIU Hong-Liang2 (1. College of Environment and Resources, Jilin University, Changchun 130023, China; 2. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China)

【机构】 吉林大学环境与资源学院北京化工大学化学化工学院北京化工大学化学化工学院 长春130023长春130023北京100029北京100029

【摘要】 采用催化湿法氧化 (CWAO)技术 ,以 Co/ Bi为催化剂 ,对垃圾渗滤液中氨氮 (NH3-N)进行降解处理 ,并利用 GC-MS检测了垃圾渗滤液中含氮有机物的相对含量 .结果表明 ,随着反应温度的升高 ,CWAO对NH3-N的降解能力逐渐增强 ,在 2 2 0 ,2 40 ,2 60和 2 80℃条件下 ,NH3-N降解规律符合一级动力学反应 (r>0 .93 ,n=6) .在升温过程 (2 0~ 3 0 0℃ )中 ,NH3-N浓度变化经历了先升后降两个阶段 ,并在 2 2 0℃时达到最大值 .GC-MS检测结果表明 ,在第一阶段 ,垃圾渗滤液中几种含氮有机物因催化氧化而生成 NH3-N;第二阶段 ,NH3-N逐渐被氧化降解 ,达到了 CWAO技术同时降解有机物和 NH3-N的目的 .同时 ,选取垃圾渗滤液中一种含氮有机物 2 -巯基苯并噻唑进行含氮有机物氮降解机理的验证实验 .

【Abstract】 Catalytic Wet Air Oxidation(CWAO) was used for the decomposition of ammonia(NH3-N) from the landfill leachates in the presence of Co/Bi catalyst and the relative content of nitrogenous organic compounds in the landfill leachates was also measured by GC-MS. The results show that the decomposition ability of NH3-N by CWAO gradually increased with increasing reaction temperature. The kinetic decomposition of NH3-N at temperatures 220, 240, 260 and 280 ℃ was well described with the first-order kinetics model(r>0.93, n=6). During the overall process of temperature rising(20—300 ℃), the concentration of NH3-N increased in the first stage and then decreased in the second stage, which culminated at 220 ℃. Further investigations by GC-MS indicated that during the first stage, some nitrogenous organic compounds in the landfill leachates were degraded into NH3-N by CWAO, and then NH3-N was degraded by CWAO during the second stage, which presented the advantage of simultaneous removal of both NH3-N and organic compounds by CWAO. One of the nitrogen-organic compounds, 2-mercaptobenzothiazole, in the landfill leachates was selected to verify the degradation of the nitrogen-organic compounds.

【基金】 国家环保总局环境工程评估中心基金 (批准号 :0 2 2 2 0 10 0 0 0 0 5 49);吉林省环境保护补助资金 (批准号 :2 0 0 2 2 0 2 5 )资助 .
  • 【文献出处】 高等学校化学学报 ,Chemical Research In Chinese Universities , 编辑部邮箱 ,2005年03期
  • 【分类号】X705
  • 【被引频次】28
  • 【下载频次】469
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