[Study on performance of double mineral base liner using modified bentonite as active material].
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.
Qu
Zhi-Hui
ZH
College of Environment and Resources, Jilin University, Chanchun 130026, China. qzh-19831001@163.com
Zhao
Yong-Sheng
YS
Wang
Tie-Jun
TJ
Ren
He-Jun
HJ
Zhou
Rui
R
Hua
Fei
F
Wang
Bing
B
Hou
Yin-Ting
YT
Dai
Yun
Y
D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D001546:Bentonite / Q000737:chemistry*; D002947:Cities; D000077215:Clay; D006358:Hot Temperature; D012037:Refuse Disposal / Q000379:methods*; D014876:Water Pollution / Q000517:prevention & control*
D000538:Aluminum Silicates; D001546:Bentonite; D000077215:Clay