THE EFFECT OF BIOREMEDIATION ON THE COMPACTION PARAMETERS, CBR, AND PERMEABILITY OF OIL POLLUTED SOIL
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THE EFFECT OF BIOREMEDIATION ON THE COMPACTION PARAMETERS,
CBR, AND PERMEABILITY OF OIL POLLUTED SOIL
ABSTRACT
Environmental pollution with petroleum and petrochemical
products has been recognized as one of the most important and serious
challenges facing environment engineers. Disposal from mechanic sites,
accidental leakages from petroleum carrying ships, vandalization of pipelines,
have all contributed to the current common oil pollution in Nigeria today.
The currently used physical and chemical remediation are
effective for the degradation of petroleum products but the affected medium
lose the desired properties. Apart, they frequently produce many hazardous
compounds which are harmful for living beings. In contrast, bioremediation is
effective in terms of safety of the desired properties, but long term tolerance
studies are needed before it’s being recommended for large scale use.
Bioremediation of engine oil-polluted, and diesel polluted
lateritic soil samples were carried out; using indigenous oil-degrading
bacteria isolated from deliberately polluted soil samples. Isolates were
subjected to biochemical tests, and identified as pseudomonas. The engineering
properties of polluted samples were tested as the bioremediation proceeds. The
result showed that the polluted samples regained almost all engineering
properties on complete bioremediation of the polluted sample. Meanwhile, the
rate at which the bioremediation takes place highly depends on the nature of
the pollution. In this case, the rate of bioremediation of diesel-polluted
sample is higher than that of the engine oil-polluted sample under the same
condition.
CHAPTER ONE
INTRODUCTION
1.1
Background of the Research.
1.1.1. Bioremediation Concept: Bioremediation can be defined
as any process that uses microorganism or their enzymes to reform the
environment altered by contaminants to its original condition. Bioremediation
may be employed in order to attack specific contaminants, such as oil spills
that are broken down using multiple techniques including the addition of
fertilizer to facilitate the decomposition of crude oil by bacteria. Such treatment
will go a long way to improving the engineering properties of such soil and
enhance its suitability.
Generally, bioremediation technologies can be classified as
insitu or exsitu. Insitu bioremediation involves treating the contaminated
material at the site while exsitu involves the removal of the contaminated
material to be treated elsewhere.
Often, bioremediation can be accomplished without human
intervention by microorganisms that are naturally found in the contaminated
matrix.
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