中文关键词:氧化钙改性高岭土垃圾渗滤液氨氮去除 英文关键词:calcium oxide, modified kaolin, landfill leachate, ammonia nitrogen, removal 基金项目:

作者	单位	E-mail
李晶	成都理工大学	1447194602@qq.com
邓昭平	成都理工大学	dengshp@cdut.edu.cn

摘要点击次数:1751 全文下载次数:0 中文摘要: 采用氧化钙对高岭土进行改性，并用XRD、SEM和FTIR对改性高岭土进行了表征。将改性高岭土应用于垃圾渗滤液的处理，考察了改性高岭土投加量、渗滤液初始pH、时间等因素对氨氮去除效果的影响，并对其吸附机理进行了研究。结果表明：氧化钙改性高岭土的产物主要是胶凝材料水化物（硅铝酸钙和含Al的C-S-H凝胶），形貌为蜂窝状；向氨氮含量为3520 mg?L-1，pH为7.53~7.80的垃圾渗滤液中，投加160 g?L-1吸附剂，吸附60 min，氨氮的出除率达82.66%，吸附量为18.19 mg?g-1。氧化钙改性高岭土对氨氮的吸附符合Langmuir等温模型，动力学上符合准二级动力学方程，其相关系数分别为0.9678，0.9989。同时，该吸附过程包含了膜扩散和颗粒内扩散。 英文摘要: Kaolin was modified with calcium oxide, which was characterized by XRD, SEM, FTIR. Landfill leachate was treated by the modified kaolin. And the effects of the dosage, the initial solution pH, adsorption time on the removal of ammonia nitrogen, and the adsorption mechanism were discussed. The results showed that: the products of calcium oxide modified kaolin main cementitious material hydrate(calcium silicoaluminate and Al-containing C-S-H ) ，and its shape is a honeycomb; The removal efficiencies of 160 g?L-1 adsorbent to landfill leachate with 3520 mg.L-1 ammonia, pH 7.53~7.80 can reach 82.6%, the adsorption capacity was 18.2 mg.g-1 after absorbed 60 minutes. The equilibrium isotherm and kinetics models showed that the adsorption of ammonia by calcium oxide modified kaolin agrees with Langmuir equation and quasi-second-order equation well, and the correlation coefficients were 0.9723, 0.9989. And the progress includes intra-particle diffusion and the boundary layer diffusion. 查看全文查看/发表评论下载PDF阅读器 相关附件：版权转让声明书附件1 -->