温度和pH对填埋场防渗帷幕吸附重金属离子的影响  

Effects of pH Value and Temperature on Adsorption of Heavy Metal lons by Anti-Seepage Curtain for Landfills

作　　者：陈永贵[1] 叶为民[1] 张可能[2] 

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]中南大学地学与环境工程学院,长沙410083

出　　处：《上海环境科学》2008年第4期152-155,共4页Shanghai Environmental Sciences

基　　金：国家自然科学基金项目，编号：40728003、40772180;湖南省自然科学基金项目，编号：07JJ4012;湖南省教育厅资助科研项目，编号：06C093;上海市地质工程重点学科

摘　　要：以Pb（NO3）2和CdCl2作为模拟渗滤液,通过吸附实验,研究了体系pH值和温度变化对填埋场防渗帷幕吸附垃圾渗滤液中重金属离子的影响,探讨了防渗帷幕对重金属离子的吸附机理。研究结果表明：pH值是影响重金属离子吸附的重要因素,一般来说,弱酸性环境（pH=5～7）有利于防渗帷幕对铅和镉的吸附,随着体系pH值的升高,防渗帷幕对铅和镉的吸附率逐渐增大,且对铅的吸附率高于对镉的吸附率;温度是影响防渗帷幕吸附过程的重要环境因子之一,实验条件下,随着温度的升高,防渗帷幕对重金属离子的平衡吸附量均略微下降,说明季节不同防渗帷幕对渗滤液的阻滞能力不同。Characteristics of the adsorption of heavy metal ions in refuse leachate by anti-seepage curtain for landfills affected by pH value and temperature were studied by equilibrium experiment, and the adsorbing mechanism of anti-seepage curtain to heavy metal ions was discussed. The results have shown that pH value was an important factor to affect the adsorption of heavy metal ions. Weak acidic environment （pH = 5 - 7） would be propitious to the adsorption of lead and cadmium. The adsorption rates increased along with the rise of pH value of the system while the rate for lead being higher than that for cadmium. Temperature could cause different effects on the adsorption by anti-seepage curtain. Under experimental conditions, the equilibrium adsorption quantity of anti-seepage curtain to heavy metal ions would slightly drop with the rise of temperature indicating that the effect could be different for anti-seepage curtain to retard leachate in different seasons.

关 键 词：温度 填埋场 粘土 注浆 帷幕 吸附 重金属离子 

分 类 号：X832[环境科学与工程—环境工程] TQ322.4[化学工程—合成树脂塑料工业]