摘要
将膨润土和胶粘剂加以混合 ,结合国外先进的粘结工艺 ,制成防渗卷材 .对膨润土类型、外封装用材料及胶粘剂的确定 ,卷材的成型工艺及卷材的渗透性能研究结果表明 ,钠基膨润土的渗透性能优于钙基膨润土 .在人工钠土中无论是加入聚丙烯酸酯类乳液还是 PM植物胶 ,在掺加的比例一定时 ,随着密度的增大 ,渗透系数下降 ;在相同密度下 ,随着掺加的比例增大 ,渗透系数下降 .人工钠土的渗透系数与水力坡度呈线性关系 .膨润土及其胶粘剂卷材与模拟浸出液间的化学配伍性较好 .膨润土卷材具有良好的自封闭性 ,在材料受损的情况下也能够通过自封闭作用达到较好的“焊接”效果 .
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.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2000年第6期56-60,共5页
Environmental Science
基金
国家"八五"科技攻关项目! (85- 90 9- 0 3)
关键词
膨润土
防渗卷材
渗透性能
胶粘剂
垃圾处理
bentonite
waterproof roll liner
permeability
adhesive
permeability coefficient
hydraulic gradient
