Combination of bioremediation and electrokinetics for the in-situ treatment of diesel polluted soil: A comparison of strategies

被引:60
作者
Mena Ramirez, Esperanza [1 ]
Villasenor Camacho, Jose [1 ]
Rodrigo, Manuel A. [2 ]
Canizares, Pablo [2 ]
机构
[1] Univ Castilla La Mancha, Res Inst Chem & Environm Technol ITQUIMA, Dept Chem Engn, E-13071 Ciudad Real, Spain
[2] Univ Castilla La Mancha, Fac Chem Sci & Technol, Dept Chem Engn, E-13071 Ciudad Real, Spain
关键词
Electrokinetic soil flushing; Electrobioremediation; Diesel polluted soil; Polarity reversal; Permeable reactive barrier; OIL-CONTAMINATED SOILS; ENHANCED BIOREMEDIATION; LABORATORY FEASIBILITY; CLAYEY SOIL; INJECTION; REMEDIATION; METALS;
D O I
10.1016/j.scitotenv.2015.06.127
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The aim of this work is to compare different strategies based on electrokinetic soil flushing and bioremediation for the remediation of diesel-polluted soil. Four options were tested at the laboratory scale: single bioremediation (Bio), performed as a control test; a direct combination of electrokinetic soil flushing and biological technologies (EKSF-Bio); EKSF-Bio with daily polarity reversal of the electric field (PR-EKSF-Bio); and a combination of electrokinetic soil flushing and a permeable reactive biological barrier (EKSF-BioPRB). Four batch experiments of 14 days duration were carried out for comparing technologies at room temperature with an electric field of 1.0 V cm(-1) (in EKSF). A diesel degrading microbial consortium was used. The experimental procedure and some specific details, such as the flushing fluids used, varied depending on the strategy. When using the EKSF-Bio option, a high buffer concentration was required to control the pH, causing soil heating, which negatively affected the biological growth and thus the diesel removal. The PR-EKSF-Bio and the EKSF-BioPRB options attained suitable operating conditions and improved the transport processes for biological growth. Polarity reversal was an efficient option for pH, moisture and temperature control. Homogeneous microbial growth was observed, and approximately 20% of the diesel was removed. The BioPRB option was not as efficient as PR-EKSF-Bio in controlling the operating conditions, but the central biobarrier protected the biological activity. Microbial growth was observed not only in the biobarrier but also in a large portion of the soil, and 29% of the diesel was removed in the short remediation test. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:307 / 316
页数:10
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