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Low accessibility and chemical activity of PAHs restrict bioremediation and risk of exposure in a manufactured gas plant soil

Reichenberg, Fredrik; Karlson, Ulrich Gosewinkel; Gustafsson, Orjan; Long, Sara M.; Pritchard, Parmely H.; Mayer, Philipp. 2010 Low accessibility and chemical activity of PAHs restrict bioremediation and risk of exposure in a manufactured gas plant soil. Environmental Pollution, 158 (5). 1214-1220. 10.1016/j.envpol.2010.01.031

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Abstract/Summary

Composting of manufactured gas plant soil by a commercial enterprise had removed most of its polycyclic aromatic hydrocarbons (PAHs), but concentrations remained above regulatory threshold levels. Several amendments and treatments were first tested to restart the PAH degradation, albeit with little success. The working hypothesis was then that PAHs were “stuck” due to strong sorption to black carbon. Accessibility was measured with cyclodextrin extractions and on average only 4% of the PAHs were accessible. Chemical activity of the PAHs was measured by equilibrium sampling, which confirmed a low exposure level. These results are consistent with strong sorption to black carbon (BC), which constituted 59% of the total organic carbon. Composting failed to remove the PAHs, but it succeeded to minimize PAH accessibility and chemical activity. This adds to accumulating evidence that current regulatory thresholds based on bulk concentrations are questionable and alternative approaches probing actual risk should be considered. Bioremediation of MGP soil failed to eliminate PAHs but it succeeded to limit their accessibility, chemical activity and the remaining risk of biological exposure.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1016/j.envpol.2010.01.031
Programmes: CEH Topics & Objectives 2009 onwards > Biogeochemistry
CEH Sections: Unaffiliated
ISSN: 0269-7491
Additional Keywords: soot, biodegradation, hydrophobic organic pollutants, freely dissolved concentrations, persistence
Date made live: 03 Mar 2011 11:32
URI: http://nora.nerc.ac.uk/id/eprint/13692

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