摘要
矿冶固废渗滤液流经包气带系统时,包气带系统中的黏土矿物、土壤有机质、土壤微生物和植物根系会把渗滤液中的部分污染物质固定下来,使渗滤液得到净化。包气带系统中的微生物、黏土矿物、有机质和植物根系构成了包气带系统的净化介质,是决定包气带系统自净能力和影响重金属迁移转化的关键因素。分别从包气带系统中的黏土矿物、土壤有机质、土壤微生物和植物四个方面对重金属的净化机理进行了阐述分析,指出包气带系统对重金属的净化作用可能是暂时的,pH值和Eh值等条件的改变会促使累积在包气带系统中的重金属重新发生迁移,并提出利用包气带系统净化矿冶固废渗滤液中具有高毒性与放射性的核素时,必须对该核素在包气带系统中的迁移转换规律进行研究,只有这样才能合理地利用包气带系统的自净作用,保障生态环境的安全性。
Soil microorganism,clay minerals,soil organic matter and plant roots in the vadose zone can immobilize some pollutants in the seepage when the seepage from the mining solid waste flows through the vadose zone,making seepage purified,and they compose the purification medium of the vadose zone and are the key factors of selfpurification ability and the migration and transformation of heavy metals in the vadose zone.This paper reviews the purification mechanism of the vadose zone for heavy metals in the following four aspects：clay minerals,organic matter,microorganism and plant roots respectively.The paper points out that the purification of heavy metals by vadose could be temporary because the heavy metals immobilized in soil could remigrate with some conditions in the vadose changing,such as pH,Eh and so on.Moreover,the paper proposes that the migration and transformation laws of nuclides must be studied when the seepage from the mining solid waste contains nuclides with highly toxicity and radioactivity in the vadose zone,which can make rational use of the self-purificaiton of the vadose zone and ensure the safety of the environment around the vadose.
作者
宋勇
吕俊文
邓钦文
谭文发
房琦
SONG Yong LYU Junwen DENG Qinwen TAN Wenfa FANG Qi(School of Environment Protection and Safety Engineering ,University of South China, Hengyang 421001, China)
出处
《安全与环境工程》
CAS
2017年第2期79-85,共7页
Safety and Environmental Engineering
基金
国家自然科学基金项目(11275092)
关键词
包气带系统
矿冶固废
渗滤液
重金属
净化作用
vadose zone system
mining solid waste
seepage
heavy metal
purification
