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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 |
Appears in Collections: | Articles |
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Bumbac C.pdf 11 12.pdf | 234.99 kB | Adobe PDF | View/Open |
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