含零价铁和堆肥混合物的PRB处理砷、重金属及酸度的研究

时间：2009-04-01  阅读：    我要评论:

原文题目：

Treatment of Arsenic, Heavy Metals, and Acidity Using a Mixed ZVI-Compost PRB

作者：

Ralph D. Ludwig, David J. A. Smyth, David W. Blowes, Laura E. Spink, Richard T. Wilkin, David G. Jewett, Christopher J. Weisener

Abstract
A 30-month performance evaluation of a pilot permeable reactive barrier (PRB) consisting of a mixture of leaf compost, zero-valent iron (ZVI), limestone, and pea gravel was conducted at a former phosphate fertilizer manufacturing facility in Charleston, SC. The PRB is designed to remove heavy metals and arsenic from groundwater by promoting microbially mediated sulfate reduction and sulfide-mineral precipitation and arsenic and heavy metal sorption. Performance monitoring showed effective treatment of As, Pb, Cd, Zn, and Ni from concentrations as high as 206 mg L??1, 2.02 mg L??1, 0.324 mg L??1, 1060 mg L??1, and 2.12 mg L??1, respectively, entering the PRB, to average concentrations of <0.03 mg L??1, < 0.003 mg L??1, < 0.001 mg L??1, < 0.23 mg L??1, and <0.003 mg L??1, respectively, within the PRB. Both As(III) and As(V) were effectively removed from solution with X-ray absorption near edge structure (XANES) analysis of core samples indicating the presence of As(V) in oxygen-bound form and As(III) in both oxygen- and sulfur-bound forms. XANES solid phase sulfur analysis indicated decreases in the peak amplitude of intermediate oxidized sulfur species and sulfate components with increasing distance and depth within the PRB.

原文地址：http://pubs.acs.org/doi/abs/10.1021/es802394p

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