Odor is a matter of serious concern since odor has been
recognized as a kind of sensory pollution that gives an unpleasant
and disgust feeling and it is often linked directly to the quality of
life. The primary cause of ever increasing odor is increase in
population, and hence the public nuisance increases with
economic growth and rise in living standard. Sewage Treatment
Plants (STPs) were the major sources of malodors. STPs generate a
vast range of Volatile Organo-Sulfur Compounds (VOSCs) which
contribute to malodor. Most of the malodorous compounds
(VOSCs), produced from various municipal sources associated with
the STPs, may cause unpleasant feeling even when present in low
concentrations. It has been estimated [1] that each person
discharges 1–1.5 g sulfur per day to the sewerage network and
about 70% is of this is sulfate which comes from urine. Domestic
sewage typically contains 3–6 mg/l organic sulfur mainly derived
from proteinaceous materials [2] and also from sulphonates
present in household detergents. Inorganic sulfur, in the form of
sulfate may be present in various quantities depending on the
hardness of the water, typically in the concentration range of 30–
60 mg/l. Sewage contains large quantities of many organic and
inorganic components that are usually utilized by a variety of
different micro-organisms [3]. The dominant type of microbial
activity in sewers is determined by the composition of different
components in the sewage, especially electron acceptors (biological
oxidants)