Enhanced bioremediation of oil contaminated soil by graded modified Fenton oxidation
Release time:2024-08-09
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- Affiliation of Author(s):
- 环境与市政工程学院
- Journal:
- Journal of Environmental Sciences
- Key Words:
- 中文关键字:oil contaminated soil; graded modified Fenton’s ox,英文关键字:oil contaminated soil; graded modified Fenton’s ox
- Abstract:
- Graded modified Fenton’s (MF) oxidation is a strategy in which H2O2 is added intermittently to prevent a sharp temperature increase and undesired soil sterilization at soil circumneutral pH versus adding the same amount of H2O2 continuously. The primary objective of the present study was to investigate whether a mild MF pre-oxidation such as a stepwise addition of H2O2 can prevent sterilization and achieve a maximum degradation of tank oil in soil. Optimization experiments of graded MF oxidation were conducted using citric acid, oxalic acid and SOLV-X as iron chelators under different frequencies of H2O2 addition. The results indicated that the activity order of iron chelates decreased as: citric acid (51%) > SOLV-X (44%) > oxalic acid (9%), and citric acid was found to be an optimized iron chelating agent of graded MF oxidation. Three-time addition of H2O2 was found to be favorable and economical due to decreasing total petroleum hydrocarbon removal from three time addition (51%) to five time addition (59%). Biological experiments were conducted after graded MF oxidation of tank oil completed under optimum conditions mentioned above. After graded oxidation, substantially higher increase (31%) in microbial activity was observed with excessive H2O2 (1470 mmol/L, the mol ratio of H2O2:Fe2+ was 210:1) than that of non-oxidized soil. Removal efficiency of tank oil was up to 93% after four weeks. Especially, the oil fraction (C10–C40) became more biodagradable after graded MF oxidation than its absence. Therefore, graded MF oxidation is a mild pretreatment to achieve an effective bioremediation of oil contaminated soil.
- Note:
- 徐金兰
- Co-author:
- 辛磊,畅坤
- First Author:
- huangtinglin,xujinlan
- Indexed by:
- Journal paper
- Volume:
- 卷:23
- Issue:
- 期:11
- Page Number:
- 页:1873-1879
- Translation or Not:
- no
- Date of Publication:
- 2011-11-01
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