Heavy metals removal and hydraulic performance in zero-valent iron/pumice permeable reactive barriers.

Abstract:

:Long-term behaviour is a major issue related to the use of zero-valent iron (ZVI) in permeable reactive barriers for groundwater remediation; in fact, in several published cases the hydraulic conductivity and removal efficiency were progressively reduced during operation, potentially compromising the functionality of the barrier. To solve this problem, the use of granular mixtures of ZVI and natural pumice has recently been proposed. This paper reports the results of column tests using aqueous nickel and copper solutions of various concentrations. Three configurations of reactive material (ZVI only, granular mixture of ZVI and pumice, and pumice and ZVI in series) are discussed. The results clearly demonstrate that iron-pumice granular mixtures perform well both in terms of contaminant removal and in maintaining the long-term hydraulic conductivity. Comparison with previous reports concerning copper removal by ZVI/sand mixtures reveals higher performance in the case of ZVI/pumice.

journal_name

J Environ Manage

authors

Moraci N,Calabrò PS

doi

10.1016/j.jenvman.2010.06.019

subject

Has Abstract

pub_date

2010-11-01 00:00:00

pages

2336-41

issue

11

eissn

0301-4797

issn

1095-8630

pii

S0301-4797(10)00177-5

journal_volume

91

pub_type

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