Kinetics Of Nitrobenzene Biotransformation
Author(s)
A. V. N. Swamy & Y. Anjaneyulu
Abstract
Nitrobenzene and substituted aromatics like nitro-chlorobenzene, aniline, and
nitro-toluene containing chlorine, amino and methyl groups are recalcitrant in
nature. These molecules are both anthropogenic and xenobiotic. Nitro benzene
and nitro aromatic compounds are environmental pollutants discharged through
wastewaters from nitro aromatic manufacturing plants. Nitrobenzene and other
aromatics are toxic to several forms of aquatic life. However, biological
transformation of nitrobenzene to non-toxic entities exists in specialized
microbes, which have enzymes of aromatic catabolic pathways. Transformation
of nitrobenzene is also inhibited by the presence of other toxic materials such as
cyanides and sulphides that are present in industrial waste when nitrobenzene is
the dominant carbonaceous material. Kinetics of the biotransformation of
nitrobenzene using pure cultures isolated in the laboratory, mixture of
consortium of the pooled cultures and enriched activated sludge biomass in pure
substrates, mixed substrates and actual nitrobenzene plant waste has been
estimated under varying input concentrations. Experimental results from these
studies have been subjected to analysis by mathematical models using Monod’s
and Haldane’s equations to test their validity in interpreting the data on
inhibitory substances under stable as well as unstable state operations of
wastewater treatment plants. Comparative evaluation of the kinetic parameters
reveals that Monod’s model can be employed for the estimation of kinetic
constant µ only while Haldane’s model has to be used for the calculation of µmax
and Ki.
Keywords: kinetics, nitrobenzene, nitrochlorobenzene, and biotransformation.
Keywords
kinetics, nitrobenzene, nitrochlorobenzene, and biotransformation.
Related Book
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