Flushing of a Pb(II) contaminated soil using HCl, EDTA, AND CaCl2

被引:113
作者
Reed, BE [1 ]
Carriere, PC [1 ]
Moore, R [1 ]
机构
[1] OMEGA ENVIRONM SERV WASH INC,MILFORD,OH 45150
来源
JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE | 1996年 / 122卷 / 01期
关键词
D O I
10.1061/(ASCE)0733-9372(1996)122:1(48)
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Flushing of a Pb(II) synthetically contaminated sandy loam using 0.1 N HCl, 0.01 M EDTA, and 1 M CaCl2 was investigated in the continuous-flow (column) mode. Initial Pb soil concentrations ranged from 500 to 600 mg/kg. Pb-removal efficiencies (and final soil Pb concentrations) for HCl, EDTA, and CaCl2 were 85% (77 mg/kg Pb), 100% (approximate to 0 mg/kg Pb), and 78% (135 mg/kg Pb), respectively. Given that HCl and CaCl2 could not reduce the soil Pb to background levels (approximate to 25 mg/kg) for a synthetically contaminated soil brings into doubt their effectiveness in remediating actual contaminated soils where metal retention would be much stronger. While EDTA removed all lead (indigenous and ''artificial''), its treatment and reuse and possible adverse health effects makes its use difficult. The final soil pH for HCl was near 1, raising the concern of increased contaminant mobility, decreased soil productivity, and adverse changes in the soil's chemical and physical structure due to mineral dissolution. Final soil pHs for EDTA and CaCl2 ranged between 4.85 and 5.2.
引用
收藏
页码:48 / 50
页数:3
相关论文
共 4 条
[1]   LEAD REMOVAL FROM SOILS VIA BENCH-SCALE SOIL WASHING TECHNIQUES [J].
CLINE, SR ;
REED, BE .
JOURNAL OF ENVIRONMENTAL ENGINEERING-ASCE, 1995, 121 (10) :700-705
[2]  
MOORE RE, 1995, THESIS W VIRGINIA U
[3]   RETENTION AND RELEASE OF LEAD BY A VERY FINE SANDY LOAM .1. ISOTHERM MODELING [J].
REED, BE ;
CLINE, SR .
SEPARATION SCIENCE AND TECHNOLOGY, 1994, 29 (12) :1529-1551
[4]  
1993, EPA542R92012