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Abstract
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Article Information:
Phytoassessment of a 5-Month Old Waste Engine Oil Polluted Soil after Augmentation with Pleurotus tuberregium
Beckley Ikhajiagbe and Geoffery Obinna Anoliefo
Corresponding Author: Beckley Ikhajiagbe
Submitted: 2011 July, 26
Accepted: 2011 September, 18
Published: 2012 January, 20 |
Abstract:
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The present study is a bioassessment of the effects of of substrate microbial augmentation on the
bioremediation of Waste Engine Oil (WEO) polluted soil. Four 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. Nine months after bioaugmentation (9 MAB) there was 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. Significant (p = 0.05) decreases in heavy metal concentration from 5-9
MAB resulted in significant reductions in Hazard Quotients (HQ), which implied less possibility for ecological
risk for heavy metal constituents. Phytoassessment of the polluted soil was carried at 5MAP, and results showed
that virtually all the cowpea seedlings died within 2 weeks. Only those seedlings in unpolluted soils survived.
Nine months after readjustment of soil treatments, all cowpea plants survived up to fruiting, with grain yields
in the most polluted soil being 15.25 g/plant compared to 26.01 g/plant in the control experiment. Although
heavy metals were minimally accumulated in leaves and seeds of cowpea, bioaccumulation was not significant
when Bioaccumulation Quotients (BQ) were computed, with BQ value ranges as 0.01-0.05 in seeds and 0.0
-0.80 in leaves. Hydrocarbons was detected in cowpea leaves but not in the seeds.
Key words: Bioaugmentation, phytoassessment, Pleurotus tuberregium, waste engine oil, , ,
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Cite this Reference:
Beckley Ikhajiagbe and Geoffery Obinna Anoliefo, . Phytoassessment of a 5-Month Old Waste Engine Oil Polluted Soil after Augmentation with Pleurotus tuberregium. Current Research Journal of Biological Sciences, (1): 10-16.
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ISSN (Online): 2041-0778
ISSN (Print): 2041-076X |
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