Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1134
Title: Coupled chemical and biological treatment of oil contaminated soils
Authors: Bumbac, Costel
Diacu, Elena
Keywords: Soil remediation;Diesel;Chemical oxidation;Natural attenuation
Issue Date: 2012
Publisher: SYSCOM 18 SRL
Abstract: 
The aim of this study was to assess the feasibility of coupling chemical oxidation (active phase) with natural
attenuation (passive phase) for diesel contaminated soils remediation and also, to evaluate the impact of
natural organic matter in the soil matrix on the remediation efficiency. For that, two soil types with different
organic matter content (TOC) were used - one sandy soil (18g/kg d.w.) and one clayey soil (39 g/kg d.w.)
spiked with 6g/kg d.w. diesel fuel. As oxidants, sodium persulfate and sodium percarbonate were evaluated
as active treatment step in soil remediation. Thus, four experimental and two control variants were conducted
in batch tests - laboratory conditions, and monitored regularly for 11 months. The results indicated that using
sodium persulfate as oxidant, for both sandy and clayey soil, lead to C8-C40 removal efficiencies of up to 53%
and respectively 68% during active treatment and global removal efficiencies of 95 and 93% respectively. It
must be noted that sodium persulfate affected (reversibly) the soil microbial populations; a lag period of
approximately two months characterized by small removal efficiencies (1-3%) was observed. Using
percarbonate as an active treatment phase lead to C8-C40 removal efficiencies of 62% for sandy soil and
34 % for clayey soil and global removal efficiencies of 85 and 96 % respectively. However, in case of
percarbonate, no clear boundary can be set between chemical and biological treatment as it can act both as
oxidant and as an oxygen source for aerobic biological processes. In case of control samples, representing
natural attenuation, slow removal rates were observed during the first 4 months, removal efficiencies of only
7 and 23% being recorded. To conclude, combining chemical oxidation and bioremediation is a viable option
for dealing with diesel contaminated soils, where bioremediation alone would not be time-effective and
chemical oxidation alone would not be cost-efficient.
Description: 
Revista de Chimie (Bucuresti), 2012, 63(11), p. 1167-1171
URI: http://hdl.handle.net/123456789/1134
ISSN: 0034-7752
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