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Odor Control

Written by  Timur Dunaev

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Odor problems at manufacturing facilities can be unexpected, and can work against the production the facility is meant to accomplish. It starts out as a nuisance or a non-compliance issue, but can become a much bigger problem. Solving the problem requires analyzing how a facility’s processes generate and disperse odorous air, and then identifying an appropriate odor control solution.

Identifying odor control needs in manufacturing operations

The emission of odorous air is a fact of life across all industries. Over the years, the problem has become familiar: As populations increase, residential developments creep closer and closer to industrial facilities that generate odors. Industrial facility leaders know they need to eliminate odors, but they often don’t know much more about how to do it.

Learning more about how odors are produced and the way they’re released can help these leaders make the right odor control decision for their site.

Examining industrial processes

Odor control experts must be dually knowledgeable in the mechanics of industrial processes and the science behind the odorous compounds generated in those processes.

These experts start their work by identifying the raw materials used in industrial processes, as well as the methods used in converting those materials to a finished product. Odors and non-odorous emissions are often produced when byproducts or waste is generated via those processes. The facility’s process flow is also evaluated.

Experts ask the following questions:

What raw materials are used in the facility?

What equipment and processes are used to convert raw materials?

How are raw materials or products transported within the facility?

What waste is generated during conversion?

What odorous compounds are produced? How concentrated are these compounds in the air?

At which points along the process flow are odors likely to escape?

Then, the expert evaluates how exposed neighbors are to offending odors.

Developing a solution

The information collected during the audit of a facility is used to design an odor control solution.

The types and concentrations of odors emitted from a facility differ based on that facility’s application, but odor control solutions typically take the following forms:

• Activated carbon filters that trap odorous compounds and release clean air.

• Chemical filters or sprays that isolate and remove offending compounds from the air.

• Ozone systems that oxidize the odors, often followed by carbon polishing.

• Biofilters that force air through organic media harboring microorganisms that get their energy by consuming odorous compounds.

• Bioscrubbers that send air through organic or synthetic media in a vessel. Microorganisms reside in recirculated water and use the odorous compounds in the air for food.

What to consider

With the variety of odor control solutions available to mitigate the variety of industrial odors, a facility’s owner or site manager needs to consider many factors that play into deciding on the odor control solution best suited to their site.

First, determine what resources you have available on site. Limited access to water may mean bioscrubbers or biotrickling filters should be avoided. Mechanical resources matter, too. Ventilation schemes in some facilities may be bettersuited for certain odor control solutions and may rule out others. Also, ventilation modifications could set the stage for a more effective odor control solution. Your odor control expert can help determine the best way forward.

Second, assess the scale of the odor issue in the facility. Your odor control expert will help you identify offending or harmful compounds, quantify the airflow carrying those compounds and determine how much of the odor should be removed.

Third, think about the space you have available. If space is limited and neighboring land is in development, a large biofilter may not be practical.

Bioscrubbers and biotrickling filters are smaller but can typically handle airstreams with higher concentrations of odor than a biofilter. Conversely, if you have a lot of real estate to use and don’t have any close neighbors, a biofilter might be the best choice.

Finally, consider your maintenance personnel. The various odor control solutions on the market require various amounts of skill and man hours to maintain. Some even require workers to handle hazardous materials. Will you need to hire more maintenance staff or invest in additional training? Could you reduce that staff with a less labor-intensive odor control solution?

Your odor control expert should look at the entirety of your facility. Odor control is not about slapping treatment equipment down in each spot where odorous air is noticed, and in fact this approach can prove to be far more expensive. Proper odor treatment requires a diligent survey of the inner workings of a plant with the goal of centralizing and then efficiently treating as much foul air as possible. This may mean a larger investment at first, but the result will be a reliable, effective, longterm odor control solution.

The right partner

Serious odor issues require a serious approach that attacks every angle of the problem. If your odor control expert doesn’t take the time to analyze your products and processes to tailor a solution that fits your site’s individual needs, find one who does. It could mean the difference between persisting nuisance odors and clean, odor-free air over the long term.

About the author

Timur Dunaev leads business development, process and research efforts for BioAir Solutions, focusing on holistic odor control. Prior to that, he worked in and managed process design and development for the industrial and municipal wastewater treatment industry for the first five years of his career. Timur holds a B.Sc. in Environmental Engineering from Middle East Technical University and an M.S. in Water Resources and Environmental Engineering from Villanova University. Timur is an EIT in the state of Pennsylvania.


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