کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4411190 1307582 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ex situ bioremediation of a soil contaminated by mazut (heavy residual fuel oil) – A field experiment
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Ex situ bioremediation of a soil contaminated by mazut (heavy residual fuel oil) – A field experiment
چکیده انگلیسی

Mazut (heavy residual fuel oil)-polluted soil was exposed to bioremediation in an ex situ field-scale (600 m3) study. Re-inoculation was performed periodically with biomasses of microbial consortia isolated from the mazut-contaminated soil. Biostimulation was conducted by adding nutritional elements (N, P and K). The biopile (depth 0.4 m) was comprised of mechanically mixed polluted soil with softwood sawdust and crude river sand. Aeration was improved by systematic mixing. The biopile was protected from direct external influences by a polyethylene cover. Part (10 m3) of the material prepared for bioremediation was set aside uninoculated, and maintained as an untreated control pile (CP). Biostimulation and re-inoculation with zymogenous microorganisms increased the number of hydrocarbon degraders after 50 d by more than 20 times in the treated soil. During the 5 months, the total petroleum hydrocarbon (TPH) content of the contaminated soil was reduced to 6% of the initial value, from 5.2 to 0.3 g kg−1 dry matter, while TPH reduced to only 90% of the initial value in the CP. After 150 d there were 96%, 97% and 83% reductions for the aliphatic, aromatic, and nitrogen–sulphur–oxygen and asphaltene fractions, respectively. The isoprenoids, pristane and phytane, were more than 55% biodegraded, which indicated that they are not suitable biomarkers for following bioremediation. According to the available data, this is the first field-scale study of the bioremediation of mazut and mazut sediment-polluted soil, and the efficiency achieved was far above that described in the literature to date for heavy fuel oil.

Research highlights
► First field-scale (approx. 600 m3) study of the ex situ bioremediation of mazut-polluted soil.
► 94% of the initial total petroleum hydrocarbons were biodegraded.
► 96%, 97% and 83% reductions for the aliphatic, aromatic, and NSO-asphaltene fractions, respectively.
► Confirmed biodegradation of pristane and phytane which mean that these compounds are not suitable as markers for following a bioremediation process.
► Use of zymogenous microbial consortia for re-inoculation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 83, Issue 1, March 2011, Pages 34–40
نویسندگان
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