Computation of Biokinetic Parameters of Total Petroleum Hydrocarbon Degradation using Vernonia amygdalina Stem

Ukpaka C. P; Adaobi Stephenie Nwosi-Anele

Abstract

This investigation showcases the computation of biokinetic parameters of total petroleum hydrocarbon degradation using Vernonia amygalina stem as bio-stimulant for the remediation of contaminants in loamy soil environment. The research revealed decrease in TPH degradation with increase in contact time and the percentage reduction was computed. The result shows TPH (100 dosage) > TPH (75g dosage) > TPH (50g dosage) > TPH (25g dosage) > TPH (control sample) and the characteristics and trend of variation was experienced in room and sun-dried samples investigated. The bioremediation of TPH using Vernonia amygdalina stem is more effective in room dried samples than sun dried samples. This was attributed to concentration of the nutrient contained by the bio-stimulant. The theorem of Michael Menten, model was applied for the determination of the maximum specific rate of TPH remediation and the dissociation constant of TPH in each bioreactor. This research revealed that the maximum specific rate of TPH ( ) and the dissociation constant of TPH ( ) as follows; for Michael Menten were within the range of 0.0172 to 526.32 (ppm/day)-1 and 454.55 to 833.33 (ppm/day)-1 for sun dried and room dried as well as value within the range of -15940.89 to -456.66 (ppm)-1 and -8447.29 to – 20.75 (ppm)-1 for sun and room dried. The study has shown the significance of the Vernonia amygdalina stem as one of the bio-stimulant that can be used in treatment of the soil environment contaminated with petroleum hydrocarbon. The investigation further illustrates the effect of dosage of the bio-stimulant on the rate of the petroleum hydrocarbon degradation as well as the potential especially, if the microbial activity is not inhibited by the physicochemical properties of the system and the environment. This investigation demonstrates high performance of Vernonia amygdalina and as such recommended as a good remediant for mitigation of pollutant in soil clean up programme. The research also demonstrates that the remediant catalyze the microbial activity by utilizing the available nutrient present in it and this process enhanced the TPH remediation in the contaminated soil investigated.

Computation of Biokinetic Parameters of Total Petroleum Hydrocarbon Degradation using Vernonia amygdalina Stem

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