The Biological Air Treater  (BAT) from Purafil is designed to minimize odors from wastewater treatment plants, composting sites and wastewater lift stations by using a combination of biological and dry odor-control technologies.

The BAT system provides efficient and cost-effective odor abatement and volatile organic chemical (VOC) treatment, according to Don Apking, sales manager for North American wastewater. “We created this product because in treating hydrogen sulfide odor, dry media systems top out at concentrations of 30 to 40 parts per million,” Apking says. “Removal of higher concentrations requires a biofilter.”

The system’s proprietary technology is provided through an exclusive license with Honeywell Process Solutions. The media consists of blends of specially formulated foam cubes and spacers, supported for immobilized bio-catalysts. The cubes provide high surface area per unit volume to host microbial biofilms, while the spacers supply substantial void volume and structural integrity for tall beds, as well as enhanced mass transfer and effective hydraulic dispersion and distribution.

The proprietary mixed-media support enables control of surface area and void space, reducing pressure drops across the bed. Foam-to-plastic ratios vary with engineering design and application and are used to control biofilm depth and pressure drop. BAT mixed-media beds can be used in biofilters to produce highly efficient bulk removal, intermediate removal, and polishing zones.

For polishing filtration, the system includes Purafil Odormix SP dry media, engineered to maximize the amount of permanganate active ingredient, increasing capacity without off-gasing. The media displays high working capacity for broad-spectrum oxidation of contaminants in field conditions, where multiple gases may be present.

The total system offers a compact footprint, low capital and operating costs, long media life, and ease of operation with stable biofilms that resist fluctuations. It removes pollutants including hydrogen sulfide and ammonia; hydrocarbons; sulfurics such as mercaptans; and nitrogenous compounds like trimethylamine, amides and nitriles; as well as aromatics and aliphatics. 800/222-6367; www.purafil.com.