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Phytoassessment of a 5-Month Old Waste Engine Oil Polluted Soil after Augmentation with Pleurotus tuberregium

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Author(s): Beckley Ikhajiagbe | Geoffery Obinna Anoliefo

Journal: Current Research Journal of Biological Sciences
ISSN 2041-076X

Volume: 4;
Issue: 1;
Start page: 10;
Date: 2012;
Original page

Keywords: Bioaugmentation | phytoassessment | Pleurotus tuberregium | waste engine oil

ABSTRACT
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.
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