Application of a magnesium/co-solvent system for the degradation of polycyclic aromatic hydrocarbons and their oxygenated derivatives in a spiked soil.

Abstract:

:This study evaluates the capability, efficacy and practicality of a combined approach based on solvent extraction and chemical reduction to simultaneously degrade polycyclic aromatic hydrocarbons (PAHs) and their oxygenated derivatives (OPAHs) in spiked soil. The spiked soil was washed using a composite organic solvent consisting of ethanol and ethyl lactate (1:1, v/v) and then degradation of the extracted contaminants using zero-valent magnesium. The extraction conditions were optimized at 25 °C with solvent-soil ratio of 2:1 (v/w) and the ensuing degradation efficiency ranged from 79% to 88% for the OPAHs, and 66% to 87% for the PAHs after 24 h of reaction at pH of 6.1. The reductive degradation of the spiked contaminants followed pseudo-first-order kinetics; however, comparing the kinetic results of this study to soil-free studies, the degradation rates are significantly reduced. It can be inferred that extracted organic or inorganic components from the soil medium hinder the degradation process, possibly by reducing the reactivity of the activated metal. Furthermore, to our understanding, this study is the first report on the simultaneous degradation of these priority pollutants and their oxygenated derivatives. The experimental results encourage the application of this magnesium/co-solvent system for future pilot-scale remediation studies.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Elie MR,Williamson RE,Clausen CA,Yestrebsky CL

doi

10.1016/j.chemosphere.2014.10.042

subject

Has Abstract

pub_date

2014-12-01 00:00:00

pages

793-800

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(14)01227-2

journal_volume

117

pub_type

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