Qu Zhi-Hui, Zhao Yong-Sheng, Wang Tie-Jun, Ren He-Jun, Zhou Rui, Hua Fei, Wang Bing, Hou Yin-Ting, Dai Yun
College of Environment and Resources, Jilin University, Chanchun 130026, China.
Huan Jing Ke Xue. 2009 Jun 15;30(6):1867-72.
The absorbing capacity of clay,roasting bentonites by 450 degrees C 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 degrees C 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 degrees C and dual-cation organobentonites was 24 h; the absorbing capacity of roasting bentonites by 450 degrees C and dual-cation organobentonites was larger than that of clay. Simultaneous the penetration coefficients of the two liners were respective 1.31 x 10(-8) cm x s(-1) and 2.80 x 10(-8) cm x s(-1); Double mineral base liners of clay/roasting bentonites by 450 degrees C owned larger absorbing capacity of NH4+, 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.
通过静态实验比较了黏土、450℃焙烧膨润土及双阳离子有机膨润土对垃圾渗滤液中污染物的吸附性能，并以优质垃圾渗滤液为过滤液，研究了黏土/450℃焙烧膨润土和黏土/双阳离子有机膨润土双层矿物基衬垫控制垃圾渗滤液渗透的有效性以及去除渗滤液中主要污染物的可行性。实验表明，黏土、450℃焙烧膨润土及双阳离子有机膨润土对垃圾渗滤液的吸附平衡时间均为24 h；450℃焙烧膨润土和双阳离子有机膨润土的吸附量大于黏土。同时，两种衬垫的渗透系数分别为1.31×10(-8) cm·s(-1)和2.80×10(-8) cm·s(-1)；黏土/450℃焙烧膨润土双层矿物基衬垫对NH4+的吸附量较大，而黏土/双阳离子有机膨润土双层矿物基衬垫对有机污染物的吸附能力较强，其COD衰减率比另一种衬垫高33.82%。得出结论：应根据不同类型的垃圾填埋污染物选择不同类型的改性膨润土作为“活性层”。
