Abstract
Bio
stimulation is a form of bioremediation that involves the optimization of soil
conditions such as pH, moisture, oxygen etc. to improve pollutant degradation.
It embodies the introduction/ addition of nutrients to aid microbial growth.
The impact of diesel pollution on the physicochemical properties of soil and
the effects of remediation using poultry droppings was investigated. Sample
soil, polluted with diesel was simulated in a single bio-treatment unit. Before
contamination, the soil sample was characterized after digestion (using 1:1 ratio
of 0.25M hydrochloric acid and Nitric acid) to determine the intrinsic
properties of the soil. For effective treatment, a 2:1 mixture (w/w) of the
polluted soil and the substrate in addition to 25ml of nutrient agar was
utilized. The physicochemical properties of soil and rate of pollutant
degradation after remediation was monitored for a period of 8 weeks. The
initial total heterotrophic bacterial (THB) present in the experimental soil at
week 1, was 2.44×105 cfu/g. The total heterotrophic bacterial after
bioremediation was 3.74×105 cfu/ g. Also, the total hydrocarbon content (THC)
decreased from an initial value of 7.89 mg/kg at week 1 to 2.67mg/kg at week 8.
These results demonstrate the effectiveness of poultry droppings as a potent
remediation tool for diesel polluted soil.
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