High-level arsenite removal from groundwater by zero-valent iron

被引:183
作者
Lien, HL
Wilkin, RT
机构
[1] Natl Univ Kaohsiung, Dept Civil & Environm Engn, Kaohsiung 811, Taiwan
[2] US Environm Protect Agcy Off Res & Dev, Natl Risk Management Res Lab, Ada, OK 74820 USA
关键词
arsenic; zero-valent iron; groundwater remediation; permeable reactive barriers;
D O I
10.1016/j.chemosphere.2004.10.055
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The objectives of this study were to conduct batch and column studies to (i) assess the effectiveness of zero-valent iron for arsenic remediation in groundwater, (ii) determine removal mechanisms of arsenic, and (iii) evaluate implications of these processes with regard to the stability of arsenic and long-term remedial performance of the permeable reactive barrier (PRB) technology. A high concentration arsenic solution (50 mg l(-1)) was prepared by using sodium arsenite (arsenic (III)) to simulate groundwater at a heavily contaminated Superfund site in the USA. Batch studies indicate that the removal of arsenic is a two-step reaction with fast initial disappearance of arsenite followed by a slow subsequent removal process. Flow-through columns were conducted at a flow rate of 17 ml h(-1) under reducing conditions for 6.6 mo. Kinetic analysis suggested that arsenic removal behaves as a zero-order reaction at high arsenic concentrations. Arsenic removal rate constants decreased with time and arsenic breakthrough was observed in the column study. Arsenic removal capacity of zero-valent iron was determined to be approximately 7.5 mg As/g Fe. Carbonate green rust was identified from the analysis of surface precipitates; arsenite uptake by green rust may be a major mechanism responsible for arsenic remediation by zero-valent iron. Analysis of HCl-extractable arsenic from iron samples indicated that approximately 28% of arsenic was in the form of arsenate suggesting that a surface oxidation process was involved in the arsenic removal with zero-valent iron. (c) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:377 / 386
页数:10
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