Evaluation of land farming and chemico-biological stabilization for treatment of heavily contaminated sediments in a tropical environment

Conventional and experimental methods were studied for the remediation of petroleum contaminated sediments from a dam previously used to collect acid run-off from a sulfur mine. The man-made lake had been neutralized, but bentonite rich sediments remained contaminated with very weathered hydrocarbon...

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Bibliographic Details
Published in:International journal of environmental science and technology (Tehran) 2008, Vol.5 (2), p.169-178
Main Authors: Adams, R. H, Guzmán-Osorio, F. J
Format: Article
Language:English
Subjects:
Aquatic Pollution
Bioremediation
Bioremediation, oil, total petroleum hydrocarbons, soil, toxicity
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Science and Engineering
Hydrocarbons
Oil
Sediments
Soil Science & Conservation
Toxicity
Waste Water Technology
Water Management
Water Pollution Control
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Summary:Conventional and experimental methods were studied for the remediation of petroleum contaminated sediments from a dam previously used to collect acid run-off from a sulfur mine. The man-made lake had been neutralized, but bentonite rich sediments remained contaminated with very weathered hydrocarbons (sediments with ~50,000-60,000 mg/kg Total Petroleum Hydrocarbons were used in this study). Biostimulation, bioaugmentation (with native microorganisms) and chemico-biological stabilization, all resulted in similar reductions (14-16%) in the TPH concentration over a three month period. The land farming treatments resulted in variable reductions in toxicity, ranging from nil to complete, while the chemico-biological stabilization treatment, not only eliminated acute toxicity but also resulted in a slight stimulation (~103-109%) of the test organism in the bioassay (Microtox). All three treatments reduced polyaromatic hydrocarbons of probable carcinogenicity to below or nearly below the Mexican norms, reduced Toxic Characteristic Leaching Proceedure leachates to
ISSN:1735-1472
1735-2630
DOI:10.1007/BF03326010