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Development and Permeability of New-style Synthetic Bentonite- Waterproof Roll Liner Material

Bai Qingzhong,Liu Yangsheng,Li Qiang,Li Chenglin,Nie Yongfeng(Dept.of Environ.Science and Eng.,Tsinghua Univ.,Beijing 100084, China Email:liuysh@mail.cic.tsinghua.edu.cn)  
Along with the increasingly serious pollution caused by solid wastes,the desire for safe style liner materials for landfill becomes more and more urgent.In this paper,a reliable,easily handled and cheap waterproof roll liner material was designed,in which the Bentonite,a kind of clay soil with unusual self sealing ability,was used as the protective barrier for containment of hazardous waste in landfills.On the basis of the materials′ choice,the permeability properties of this new style synthetic liner under various conditions were tested.The permeability coefficient of Na + Bentonite was less than that of Ca 2+ Bentonite.The suitable adhesives can enhance the waterproof of Na + Bentonite.After Na + Bentonite and the new liner were pretreated by water and well maintained,they hardly changed their permeability when they met such leachates as inorganic acids/bases and organic solvent(e.g.CCl 4).The new liner presents good “welding” property even if it was damaged.The experimental results indicate that this kind of bentonite waterproof roll liner is very suitable for landfill.
【Fund】: 国家“八五”科技攻关项目! (85- 90 9- 0 3)
【CateGory Index】: TU592
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