Chemical Engineering September 2017 - 41

Feature Report
Odor Issues and
Solutions for
Wastewater Treatment
Increasingly, wastewater treatment plants must address odors due to volatile contaminants.
This guide provides an overview of odor causes and possible remedial actions
P
rocesses and applications
that emit odor-causing air
contaminants are common
across many sectors of the
chemical process industries (CPI).
In many cases, including wastewater
treatment plants (WWTPs), paper
mills, asphalt refineries and other operations,
large volumes of odor-causing
compounds are generated, and
residents of the areas surrounding the
facility can be exposed.
In the past, these odors were less of
an issue because most industrial facilities
tended to be located at considerable
distances from large residential areas. In
more recent times, however, there has been
an increase in the number of industrial operations
that are located within or near small
towns and even large cities. When local residents
constantly smell these industrial processes,
unhappy neighborhoods are generally
the result.
Laura Haupert
OMI Industries
IN BRIEF
ODORS AND HEALTH
HAZARDS
WASTEWATER
TREATMENT PLANT
ODORS
ODOR REMEDIATION
METHODS
FIGURE 1. Wastewater treatment plants can be sources of odor-causing
gases, such as hydrogen sulfide, ammonia, mercaptans and others
This article provides information about
common odor-causing compounds and
about possible methods for controlling those
odors, with a particular focus on WWTPs.
The collective voice of the public is now
often strong, and has resulted in new regulations
regarding odors and odor control
at industrial facilities. Many industries can
no longer produce odors without facing
the consequences of either constant complaints,
or fines from federal, state and local
authorities. In addition to being a nuisance,
these foul odors can pose a health and
safety concern for the community, especially
at high concentrations.
Furthermore, increases in population and
associated industrial growth have driven an
increase in the amount of waste requiring
processing, and a subsequent increase in
the odor problem.
Odors and health hazards
In general, odors are subjective, so that a
particular type of odor may bother one person
while having little or no impact on another.
The odor threshold is the minimum
concentration of an odorous compound that
is necessary to be detected by 50% of the
population [1].
In principle, all chemicals can theoretically
be toxic at high enough concentrations.
For instance, water is not normally
considered toxic. However, drinking an excessive
amount of water under certain circumstances
can create a condition called
hyponatremia [2]. A similar situation applies
to the concentration of odorous gases. At
low concentrations (parts per billion; ppb),
some gases can be detected by most humans.
However, those gases are not toxic
CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM
SEPTEMBER 2017
39
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Chemical Engineering September 2017

Table of Contents for the Digital Edition of Chemical Engineering September 2017

Contents
Chemical Engineering September 2017 - Cover1
Chemical Engineering September 2017 - Cover2
Chemical Engineering September 2017 - Contents
Chemical Engineering September 2017 - 2
Chemical Engineering September 2017 - 3
Chemical Engineering September 2017 - 4
Chemical Engineering September 2017 - 5
Chemical Engineering September 2017 - 6
Chemical Engineering September 2017 - 7
Chemical Engineering September 2017 - 8
Chemical Engineering September 2017 - 9
Chemical Engineering September 2017 - 10
Chemical Engineering September 2017 - 11
Chemical Engineering September 2017 - 12
Chemical Engineering September 2017 - 13
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Chemical Engineering September 2017 - 15
Chemical Engineering September 2017 - 16
Chemical Engineering September 2017 - 17
Chemical Engineering September 2017 - 18
Chemical Engineering September 2017 - 19
Chemical Engineering September 2017 - 20
Chemical Engineering September 2017 - 21
Chemical Engineering September 2017 - 22
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Chemical Engineering September 2017 - 24
Chemical Engineering September 2017 - 25
Chemical Engineering September 2017 - 26
Chemical Engineering September 2017 - 27
Chemical Engineering September 2017 - 28
Chemical Engineering September 2017 - 29
Chemical Engineering September 2017 - 30
Chemical Engineering September 2017 - 31
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Chemical Engineering September 2017 - 33
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Chemical Engineering September 2017 - 35
Chemical Engineering September 2017 - 36
Chemical Engineering September 2017 - 37
Chemical Engineering September 2017 - 38
Chemical Engineering September 2017 - 39
Chemical Engineering September 2017 - 40
Chemical Engineering September 2017 - 41
Chemical Engineering September 2017 - 42
Chemical Engineering September 2017 - 43
Chemical Engineering September 2017 - 44
Chemical Engineering September 2017 - 45
Chemical Engineering September 2017 - 46
Chemical Engineering September 2017 - 47
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Chemical Engineering September 2017 - 105
Chemical Engineering September 2017 - 106
Chemical Engineering September 2017 - Cover3
Chemical Engineering September 2017 - Cover4
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