摘要
现场调查和室内实验表明，作为垃圾填埋结构之一的填土层对渗滤液污染物质起着不可低估的净化作用。本文在详细研究了成都市长安垃圾填埋场填土料的矿物组成、化学成分和颗粒分布特征的基础上，选取渗滤液中的主要污染物质ＮＨ＋４进行了静态和动态吸附试验。结果表明：土料对ＮＨ＋４有较强的吸附能力，平均吸附量为２．５２ｍｇ·ｇ－１，吸附速率为１．１２５ｍｇ·ｈ－１·ｇ－１，吸附过程符合Ｌａｎｇｍｕｉｒ方程。填土层在工作过程中形成了上部饱和层、中部工作层、下部新料层的三个部分，吸附机理以置换Ｃａ２＋，Ｍｇ２＋等阳离子为主的离子交换作用，出水中ＮＨ＋４与Ｃａ２＋，Ｍｇ２＋等阳离子呈现显著的负相关关系。
Based on the mineral components,chemical constituents and grain composition of intermadiat cover soil in Chengdu Landfill site,Chengdu,NH + 4 which is one of the main pollutants of leachate is chosen to be made modeling tests for static and dynamic adsorption.The resultes show NH + 4 is strongely adsorbed by soil material,and its average adsorptive capacity is 2.52 mg·g -1 ,adsorptive rate about 1.125 mg·h -1 ·g -1 .The sorption of the tested elements is in line with the Langmuir equation.Intermadiat cover can be divided into upper saturated layer,middle working layer and lower new material layer during the working,the mechanism is ions exchange proved by the fact that mass density of NH + 4 is negative correlation to the those of cations such as Ca 2+ and Mg 2+ .
出处
《矿物岩石》
CAS
CSCD
北大核心
1998年第1期108-114,共7页
Mineralogy and Petrology
基金
国家自然科学基金
