Abstract
BackgroundThe present work assesses the concentration of some heavy metal, plant species composition, and microbial diversity of spent crude oil-polluted soil from electric generator plant house, auto mechanic workshop, bakery, and auto spare part shops in four local governments areas (Egor, Ikpoba-Okha, Oredo, and Ovia North) in Edo State, Southern Nigeria.ResultsHazard quotient (HQ) of heavy metals varied in all the spent crude oil-polluted soil evaluated in the study. The HQ of heavy metals from auto mechanic workshop had the highest values for Cr (2.19), Mn (0.0965), Zn (4.1108), Fe (9.32015), and Cd (0.0155). The most frequent bacterial and fungal species found in all 16 sites were Bacillus subtilis (93.75%) and Aspergillus niger (100.0%) respectively. Auto spare part shops in Oredo had a bacterial count of 1.0 × 105 CFU/g while the bacteria count around power generator plants in Egor had a bacteria count of 1.71 × 105 CFU/g. Some of the plant species identified around all the sites include Acanthospermum hispidum, Alternanthera repens, Axonopus compressus, Cyperus esculentus, Eleusine indica, Paspalum scrobiculatum, and Tridax procumbens.ConclusionSpent crude oil pollution of the soil led to high amounts of heavy metal in the soil. However, the presence of higher plants and variable diversity and richness of microorganisms found in the soil are likely contributing to the remediation of the polluted soil.
Highlights
The present work assesses the concentration of some heavy metal, plant species composition, and microbial diversity of spent crude oil-polluted soil from electric generator plant house, auto mechanic workshop, bakery, and auto spare part shops in four local governments areas (Egor, Ikpoba-Okha, Oredo, and Ovia North) in Edo State, Southern Nigeria
Soil samples were collected from the following popular destinations: 1. Egor local government area—Benzito Fast Food electric power generator plant house at Uwasota (Egor generating plant houses (GN)), Obey God Bakery (Egor BK), auto mechanic workshop at Uwasota (Egor mechanic workshops (MW)), and auto spare parts shop at Uwelu (Egor SP)
The Hazard quotient (HQ) of Cr, Mn, and Fe were highest in auto mechanic workshop from Egor while Zn was highest in generator plant house from Ovia
Summary
The present work assesses the concentration of some heavy metal, plant species composition, and microbial diversity of spent crude oil-polluted soil from electric generator plant house, auto mechanic workshop, bakery, and auto spare part shops in four local governments areas (Egor, Ikpoba-Okha, Oredo, and Ovia North) in Edo State, Southern Nigeria. Oil spills at auto mechanic workshops, electric power-generating plants, and small- and large-scale industries continued to receive insufficient research attention despite the potential for accumulation and negative effects on sustainable development. Engine oil consists of 80–90% hydrocarbons while performance-enhancing additives make up the rest. The chemical composition of engine oils are altered during use through the breakdown of additives, contamination by foreign materials, combustion, and the addition of metals from the wear and tear.
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