When Can Surfactants Enhance Hydrocarbon
Biodegradation In Oil Biotreatments?
Author(s)
C. Calvo, A. Silva-Castro, C. Perucha, J. Laguna, I. Uad
& J. G. López
Abstract
Petroleum hydrocarbon compounds bind to soil components and are difficult to
remove and degrade. Surfactants and emulsifiers can emulsify hydrocarbons
enhancing their water solubility, and increasing the displacement of oily
substances from soil particles.
The effects of the Ivey surfactant on oil hydrocarbon biodegradation was
studied using microcosm systems containing three different soil types amended
with commercial NPK fertilizer. Microbial activity was evaluated following
growth of heterotrophic and degrading microorganisms, dehydrogenase activity
and production of CO2. Hydrocarbon degradation was established by
determining the amount of TPH (total petroleum hydrocarbon) and alkanes, the
indices nC18/phytane and pristane/nC17 and the percentage of prystane and
phytane.
Ivey surfactant augmented the amount of hydrocarbon removed in both clay
and sandy soil. This indicates that surfactant could play an important role as a
biostimulating agent at the beginning of the process and in combination with a
nutrient addition. Also, CG/SM analyses have shown changes in hydrocarbon
composition related to the rate of biodegradation
Keywords: surfactant, biodegradation, hydrocarbon.
1 Introduction
Bioremediation methods use microorganisms that occur naturally in the
environment and degrade (mineralise) contaminants to less toxic or harmless
Keywords
surfactant, biodegradation, hydrocarbon.
Related Book
Other papers in this volume
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