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2012 (Vol. 4, Issue: 01)
Article Information:

Substrate Bioaugmentation of Waste Engine Oil Polluted Soil

Beckley Ikhajiagbe and Geoffery Obinna Anoliefo
Corresponding Author:  Beckley Ikhajiagbe 

Key words:  Bioaugmentation, hydrocarbons, phytoassessment, Pleurotus tuberregium, polyaromatic waste engine oil, ,
Vol. 4 , (01): 60-67
Submitted Accepted Published
2011 July, 26 2011 September, 18 2011 January, 01
Abstract:

The present study investigated the impact of substrate microbial augmentation on the bioremediation of Waste Engine Oil (WEO) polluted soil. Five different concentrations of WEO in soil on weight basis were obtained by thoroughly mixing WEO in measured soil: 1.0, 2.5, 5.0 and 10.0% w/w. The unpolluted soil was used as the control (0% w/w) experiment. The set up was left for 5 months without physically disturbing the soil. After 5 months, the soils were first amended with sawdust and then inoculated with mycelia of Pleurotus tuberregium. Significant (p = 0.05) decreases in soil physicochemical parameters were recorded 9 months after bioaugmentation (9 MAB), excepting total organic carbon and total nitrogen, which showed significant increases throughout the experiment period. Total (100%) remediation of some PAH compounds - benzo(a)anthracene, benzo(a)pyrene, benzo(b)fluoranthene, benzo(g,h,i)perylene, benzo(k)fluoranthene, chrysene, dibenzo(a,h)anthracene, fluoranthene, fluorene, and indeno(1,2,3-c,d)pyrene - was recorded. Over sixty per cent (66.22%) of total individual PAH compounds were completely (100%) remediated. Achromobacter sp., Clostridium sp., Sarcina sp., Micrococcus sp., Nocardia sp., Penicillium sp., Rhizopus stolonifer, Mucor sp., Trichoderma sp., Aspergillus niger, A. fumigatus, A. flavus and Geotrichum sp. were dominant microorganism species in the WEO polluted soil. Significant decreases in heavy metal concentration resulted in significant reductions in Environmental Risk Factor (ERF), which implied less possibility for ecological risk for heavy metal constituents. ERF presupposes that Pb (ERF range, -69.30 to -14.97) and V (ERF range, -0.01 to 0.86) were significant potential ecological threats at 5MAP, but at 9 MAB, ERF value had decreased, with ERF ranges for Pb and V being 5.64 to 32.64 and 1.70 to 1.83, respectively.
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  Cite this Reference:
Beckley Ikhajiagbe and Geoffery Obinna Anoliefo, 2012. Substrate Bioaugmentation of Waste Engine Oil Polluted Soil.  Research Journal of Environmental and Earth Sciences, 4(01): 60-67.
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ISSN (Online):  2041-0492
ISSN (Print):   2041-0484
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