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What are your odor control options?
Questions? Comments? Call toll
free 1-888-948-3956 or Email
noodors@msn.com
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Form of odor control |
Benefit |
Disadvantage |
|
Essential Oils/ Odor Neutralizers (granule and
powder
form) |
Safe for
environment, humans, animals; natural product; easy to
use; low cost; low labor costs; works immediately; quick
and easy installation; compatible with all other odor
control options; solves any odor problem |
Will not eliminate source of odor |
|
Essential Oils/ Odor Neutralizers
(liquids) |
Safe for
environment, humans, animals; natural product; easy to
use; low cost; low labor costs; works immediately; quick
and easy installation; compatible with all other odor
control options; solves any odor problem; uniform
and constant odor control when in use |
Will not
eliminate source of odor; requires maintenance of
nozzles and compressor |
|
"Vapor-Phase" Odor Control Options
(ventilation of vapor point sources
with product) |
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Air Scrubber
(wet single or multi-stage, biological or carbon
absorption) |
Reasonably effective on typical odors; treats sulfide
and sulfur compounds, and ammonia compounds; may treat
nitrogen compounds |
May
leave up to 20% of odors; high power costs; significant
capital expense (see below); frequent routine and
emergency maintenance required; labor intensive;
footprint may be large (land required) Based upon a
20-year life-cycle and 5 to 50 ppm H2S with a
4,400 scfm air flow rate, present value cost can range
from $229,000 - $416,000. |
|
Biological
(biofilter) |
Treats
sulfide and sulfur compounds; effective at removing
hydrogen sulfide, organic sulfides, and mercaptans |
Large
land area needed; requires construction; cold weather
and unstable influent air quality reduces performance;
requires good management - upsets cause unit to stop
functioning; usually not effective at removing
nitrogen-based compounds such as ammonia and amines
Based upon a 20-year life-cycle with a 4,400 scfm air
flow rate, present value costs can be $378,000.
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| Carbon
Absorption |
Simplest
of major wastewater odor control technologies; no
ongoing chemical supply; no biological processes to
manage; effective on hydrogen sulfide and related
sulfur-based compounds |
Ammonia
and other nitrogen-based compounds not effectively
treated; will not eliminate source of odor
Based upon a 20-year life-cycle and 5 to 50 ppm
H2S with a 4,400 scfm air flow rate, present value
costs can be $229,000 - $422,000. |
|
Masking Agent |
Reduces
odors somewhat by covering or masking with another more
pleasant odor; safe; inexpensive; easy to use; works
immediately |
Original
odor may linger; masking agent odor may be pronounced
and intrusive; will not eliminate source of odor |
| Aeration |
May
reduce some odors significantly; effective on other
odors; provides a fresh atmosphere |
All
odors may not be completely eliminated; high power
costs; high capital expense; frequent routine and
emergency maintenance required; large volume of aeration
required in order to be effective; will not eliminate
source of odor Based upon a 20-year life-cycle and
5 to 50 ppm H2S with a 4,400 scfm air flow rate,
present value cost can range from $229,000 - $416,000. |
|
"Liquid-Phase" Odor Control Options
(injection of wet point sources with
product) |
|
Iron Salts |
Low
cost; treats sulfides |
Stains
concrete; difficult to control; hazardous;
corrosive; capital costs are $18,000/1 mgd w/ 5 ppm
dissolved sulfides (5,000 gallons chemical storage) plus
annual chemical costs of over $20,000 and $1,300 labor;
on-going chemical costs; unstable waste loads can cause
significant treatment problems; does not treat
non-sulfide compounds |
| Bioxide
(nitrate solution) |
Treats
sulfide and non-sulfide sulfur compounds; biochemically
oxidizes sulfides and other odorous reduced-sulfur
compounds; non-hazardous; relatively easy to use and
store |
Does not
treat non-sulfur compounds; patented (making cost
higher); can become cost-prohibitive; routine use may be
expensive Capital costs are $14,000/1 mgd w/ 5 ppm
dissolved sulfides (5,000 gallons chemical storage) plus
annual chemical costs of over $25,000 and $1,300 labor. |
|
Oxidizers
(such as hydrogen peroxide) |
Reacts
chemically with dissolved sulfides |
Many
non-odorous compounds are oxidizers, which means the
amount of product needed for odor control results in
excessive costs; product is often classified as
hazardous
Capital costs are $25,000/1 mgd w/ 5 ppm dissolved
sulfides (5,000 gallons chemical storage) plus annual
chemical costs of over $27,000 and $1,900 labor. |
|
Biological
(enzymes/bugs) |
Reduces
solids that cause odors; natural; safe; inexpensive; may
reduce biochemical oxygen demand (BOD) and/or enhance
biological treatment; effective for grease control and
lagoons as ice formation breaks up |
Might
leave some odor; will not work on all odors; will not
work immediately - requires initial time period while
colony develops and begins to work; needs warmth to work
effectively |
|
Other Options |
| Covers |
Contains
odors |
Odors
may be intensified due to confinement; confined space is
created which may be a safety hazard; corrosion may
become a significant issue depending on type of material
used; will not eliminate source of odor |
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Ozonators |
Eliminates most odors |
Ozonators needed - high capital costs; not a proven
technology in many cases |
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Absorbents |
Effective in most cases |
When
fully saturated, odors are released back into the air;
will not eliminate source of odor |
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Electrostatic Precipitators |
Reduces
odor and emissions |
Up to
20% of the odors may remain; will not work on all odors;
very high capital costs |
| Lime |
Raises
pH which can reduce or eliminate sulfate formation |
High pH
is corrosive and unsafe to handle; requires on-going
labor; adds significant mass; not a good long-term
solution |
| Blocks |
Effective in some cases; easy to use; inexpensive |
Suspected cancer-causing agents; can't be used in every
application; limited overall benefits; will not
eliminate source of the odor |
           
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