Odor and VOC Control Systems

BacTee Systems provides technical support, products, and systems that contribute to the design, production, and implementation of biological odor control systems for air or other gaseous waste streams.

Biological odor control systems belong to a family of biofiltration technologies.

Biofiltration is a biological treatment technique for removing odors and volatile organic compounds (VOCs) by using naturally-occurring microbes to capture and biologically degrade the pollutant compounds. As applied to gaseous waste streams, the process gas stream passes through a media that hosts and supports the life of the microbes that are nourished by the pollutant compounds. The pollutant compounds are converted by the microbes to innocuous compounds such as carbon dioxide, water, and other residual elements or compounds that become entrained on the media where they are either removed with the media or periodically or continually flushed by a water purge.

The media may be enclosed in a tank, concrete bunker, or (in larger systems) placed on an open pad without any side walls. The media may be either a porous organic material such as wood chips, an inorganic material such as lava rock used with a liquid nutrient additive, or one of several proprietary ‘synthetic media’ that contain their own additives and retain long-term structural integrity.

The two most common biological systems for removal of odors and VOC’s in gas streams are known as biofilters and bioscrubbers.

‘Biofilter’ typically refers to a system using an organic or synthetic media that hosts and nourishes the microbes without the need for a water flush system.

‘Bioscrubber’ typically refers to a system using an inorganic or synthetic media that provides a structural base for physically hosting the microbes but requires an intermittent or continuous water flush containing carbon nutrients that support the life of the microbes.

In all cases, these biological systems require uniform and consistent air distribution throughout the media in order to attain optimal odor or VOC removal efficiencies and the longest service life with minimal maintenance. Most biofilters also require a means to control the humidity of the gas stream prior to, or within, the media to assure adequate moisture for proper microbial activity.

In summary, the key to optimal biological odor control is to maintain uniform microbial activity throughout a bed of media by providing an acceptable range of temperature, moisture, and pH in which the biological oxidation of organic pollutants can occur.

Since every biological odor control application is unique and site specific relative to waste stream constituents, available space, and ancillary support requirements. BacTee works with project engineer/owners to propose and develop a biological odor control system that fits the local requirements and constraints. At the heart of every BacTee biological odor control system is the BioAer® aeration floor system that offers uniform air distribution throughout the media at the lowest possible air/gas transport energy cost.

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