掺绿砂改良土的重金属浸出试验研究  

Leaching behaviors of heavy metals from improved soil mixed with waste foundry sand

作　　者：孙树林[1,2] 盘霞[3] 张鑫[4] 

机构地区：[1]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [2]河海大学地球科学与工程学院,江苏南京210098 [3]广西交通职业技术学院,广西南宁530023 [4]胜利油田胜利勘察设计研究院有限公司,山东东营257026

出　　处：《岩土工程学报》2010年第2期225-230,共6页Chinese Journal of Geotechnical Engineering

基　　金：教育部留学回国人员科研启动基金(教外司留[2007]1108);河海大学水文水资源与水利工程科学国家重点实验室开放研究基金项目(2005408911)

摘　　要：通过搅拌和柱渗两种室内浸出试验方法,对土–绿砂、土–绿砂–石灰改良土在中性、酸性(模拟酸雨现象)两种浸出条件下,Zn,Fe,Mn,Pb,Cu,Cd金属离子的浸出规律进行研究。旨在获得在酸性和中性条件下,土–绿砂、土–绿砂–石灰改良土重金属离子的浸出规律。结果表明:所测的6种离子,只有Fe,Mn,Pb没有满足《生活饮用水卫生标准》;当将绿砂和绿砂改良土置于地下水位以下时,土中Zn,Mn,Cu,Cd离子的浸出浓度不比绿砂和绿砂改良土小;pH值对绿砂和绿砂改良土中Pb离子浸出浓度影响极大,酸性条件下浸出浓度极大,加石灰的试样渗出浓度极小;初始浸出浓度并不随着掺砂量的增加而增加;绿砂中Pb的离子呈指数曲线状有规律浸出。Under the two kinds of leaching conditions of soil-waste foundry sand mixture and soil-waste foundry sand mixture-lime mixture in neutral and acid（acid rain condition） environments,the contamination of various heavy metals is studied by use of the stirring and column leaching tests.The aim is to obtain the leaching rules of the heavy metals from the mixtures.The results show that only the ions Fe,Mn and Pb do not meet the drinking water standards among the measured by kinds of ions;when the waste foundry sand and the improved soil mixed with it are placed below the groundwater table,the concentration of Zn,Mn,Cu and Cd in soils is not lower than that in the waste foundry sand and the improved soil mixed with it;the pH value has great influence on the leaching concentration.It is largest under acid condition,and smallest when mixed with lime;the initial effluent concentration does not increase with the content of the waste foundry sand;the ion Pb in the waste foundry sand exhibits an exponential leaching.

关 键 词：绿砂 土 掺砂量 PH值 浸出规律 初始浸出浓度 

分 类 号：X53[环境科学与工程—环境工程]