| 改性膨润土作为反应型材料的双层防渗层性能研究 |
| 摘要点击 1430 全文点击 1274 投稿时间：2008-08-03 修订日期：2008-11-06 |
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| 中文关键词 450℃高温焙烧膨润土 双阳离子有机膨润土 双层防渗层 |
| 英文关键词 roasting bentonite by 450℃ dual cation organobentonites double mineral base liner |
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| 中文摘要 |
| 通过静态实验对粘性土、450℃高温焙烧膨润土和双阳离子有机膨润土吸附垃圾渗滤液中污染物的能力进行对比，并以新鲜垃圾渗滤液为对象，对粘性土/450℃高温焙烧膨润土双层防渗层和黏性土/双阳离子有机膨润土双层防渗层的防渗性能和截污能力进行研究.结果显示，黏性土、450℃高温焙烧膨润土和双阳离子有机膨润土对垃圾渗滤液中污染物的吸附平衡时间均为24 h； 450℃高温焙烧膨润土和双阳离子有机膨润土对垃圾渗滤液中COD和NH+4的吸附作用均大于黏性土.同时， 2种双层防渗层的渗透系数分别能达到1.31×10-8 cm·s-1和2.80×10-8 cm·s-1；黏性土/450℃高温焙烧膨润土双层防渗层对于NH+4有较强的吸附能力，而黏性土/双阳离子有机膨润土双层防渗层对有机污染物质有很强的吸附能力，对COD的衰减率比前者高出33.82%.故针对垃圾填埋场不同污染物类型的差异可以选择不同改性膨润土作为反应型材料构建双层防渗层模式. |
| 英文摘要 |
| The absorbing capacity of clay，roasting bentonites by 450℃ and dual cation organobentonites of the pollutions in landfill leachate was compared through static experiment，and investigations were conducted into availability of controlling the permeating of landfill leachate and feasibility of removing the main pollutants in leachate on the double mineral base liners of clay/roasting bentonites by 450℃ and clay/dual cation organobentonites by using nice landfill leachate as the filter fluid. Experiment indicated that the adsorption equilibrium time of landfill leachate in clay，roasting bentonites by 450℃ and dual cation organobentonites was 24 h; the absorbing capacity of roasting bentonites by 450℃ and dual cation organobentonites was larger than that of clay. Simultaneous the penetration coefficients of the two liners were respective 1.31×10-8 cm·s-1 and 2.80×10-8 cm·s-1; Double mineral base liners of clay/roasting bentonites by 450℃ owned larger absorbing capacity of NH+4，however，double mineral base liners of clay/dual cation organobentonites had strong absorbing capacity of organic pollutants and the attenuation rate of COD was 33.82% higher than the other. Conclusion was drawn that different types of modified bentonite should be chosen as “the active layer” according to different styles of landfill pollutants. |
