کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4410677 1307559 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Chemical oxidation of cable insulating oil contaminated soil
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Chemical oxidation of cable insulating oil contaminated soil
چکیده انگلیسی

Leaking cable insulating oil is a common source of soil contamination of high-voltage underground electricity cables in many European countries. In situ remediation of these contaminations is very difficult, due to the nature of the contamination and the high concentrations present. Chemical oxidation leads to partial removal of highly contaminated soil, therefore chemical oxidation was investigated and optimized aiming at a subsequent bioremediation treatment. Chemical oxidation of cable oil was studied with liquid H2O2 and solid CaO2 as well as permanganate at pH 1.8, 3.0 and 7.5. Liquid H2O2 most effectively removed cable oil at pH 7.5 (24%). At pH 7.5 poor oil removal of below 5% was observed with solid CaO2 and permanganate within 2 d contact time, whereas 18% and 29% was removed at pH 1.8, respectively. A prolonged contact time of 7 d showed an increased oil removal for permanganate to 19%, such improvement was not observed for CaO2.Liquid H2O2 treatment at pH 7.5 was most effective with a low acid use and was best fit to a subsequent bioremediation treatment. To further optimize in situ chemical oxidation with subsequent bioremediation the effect of the addition of the iron catalyst and a stepwise liquid H2O2 addition was performed. Optimization led to a maximum of 46% cable oil removal with 1469 mM of H2O2, and 6.98 mM Fe(II) chelated with citric acid (H2O2:FeSO4 = 210:1 (mol mol−1). The optimum delivery method was a one step addition of the iron catalyst followed by step wise addition of H2O2.


► Chemical oxidation by liquid H2O2 most effectively removes cable oil at pH 7.5 (24%).
► Optimization led to a maximum of 46% cable oil removal.
► A single addition of iron catalyst followed by step wise addition of H2O2 is optimal.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 84, Issue 2, June 2011, Pages 272–277
نویسندگان
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