Evoqua United States - Canada - EN

Wastewater Odor Control

Eliminate wastewater odors, prevent corrosion, and protect public health

Wastewater odor is a nuisance and in many cases can cause corrosion to wastewater infrastructure, sewer systems, valves, metal structures and electrical components. Depending on the odorous compounds involved, there can also be a danger to public health. 

Evoqua provides a broad range of solutions for effective wastewater odor control including biological, chemical, and activated carbon scrubbers, as well as liquid phase solutions for both sewer networks and in-plant odor and corrosion control.  

Our award-winning Water One® service program combines remote monitoring and data intelligence to provide proactive, predictive service for more efficient operation and more effective odor and corrosion control. 

Wastewater can have a variety of odors that range from being a nuisance to being toxic, each scent is caused by the breakdown of organic compounds

What causes odor in wastewater?

Odors originate as the organics in the wastewater breakdown, releasing a range of compounds with unpleasant smells that can be described as rotten eggs, decaying vegetation, ammonia and more. The chart below provides details of the most common odorants found in wastewater.

While organic and amine odors can be a nuisance, the primary wastewater odor of concern is hydrogen sulfide gas (H2S). Concentrations of H2S as low as 0.0005 ppm can trigger odor complaints from the surrounding community and in higher concentrations can cause significant corrosion or even be toxic.  

Substance Characteristic
Allyl Mercaptan Strong garlic, coffee
Amines Fishy
Ammonia Ammoniacal
Amyl Mercaptan Unpleasant, putrid
Benzyl Mercaptan Unpleasant, strong
Crotyl Mercaptan Skunk
Diamines (cadaverine) Decayed flesh
Dimethyl Sulfide Decayed vegetables
Ethyl Mercaptan Decayed cabbage
Hydrogen Sulfide Rotten Eggs
Methyl Mercaptan Decayed cabbage
Propyl Mercaptan Unpleasant
Skatole Fecal
Sulfur Dioxide Pungent, irritating
Tert-Butyl Mercaptan Skunk
Thiocresol Skunk, rancid
Thiophenol Putrid, garlic


Our Solutions to Wastewater Odors

The good news is that all of these wastewater odors can be controlled with the right treatment solution. Evoqua offers a wide range of equipment and services to effectively control odors in your wastewater system. As a result, you can eliminate odor complaints, reduce corrosion and protect public health. 

Liquid Phase Odor Control

A liquid phase dosing program can be used to prevent odorous compounds from forming in wastewater. Chemicals, such as Bioxide® Solution are added directly into the wastewater stream along the wastewater pipeline. The dosing can be monitored remotely and adjusted automatically throughout the day relative to flow rates.

Air Scrubber Systems 

Air scrubbers can be placed at lift stations, headworks or in enclosed areas to control odor in the air. They use biofiltration technology, which consists of contained media that is sprayed with water to affect biological growth. This process inhibits foul or harmful vapors from escaping into the atmosphere.

Carbon Based Odor Control

Application-specific carbon can be utilized in either municipal or industrial applications to mitigate noxious or even harmful odors. Using simple roll-on containers, or complex housings, carbon beds are an effective treatment for many vapor- and odor-related issues.

Tank and Lagoon Covers

Open-air wastewater treatment can benefit from tank and lagoon covers. Not only are the wastewater odors contained but certain applications open the possibility of capturing biogas for energy reuse.

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Contact Evoqua for more information on available solutions

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