Biofilter absorbs gases
Problem
The Karcher Creek Wastewater Treatment Plant in Port Orchard, Wash., needed to control odors and had no room to expand.
Solution
Engineers chose a biofilter system from Bohn Biofilter Corp. that treats 200 ppm hydrogen sulfide. The biofilter, built on the roof of the solids storage tank, accommodates large mixers penetrating through the roof into the tank below.
Result
The system provides odor control and was shut down only once in seven years for fan maintenance. 520/624-4644; www.bohnbiofilter.com.
Insulated cover seals in odors
Problem
Odors from the Southwest Water Reclamation Facility in Bradenton, Fla., bothered golfers on a nearby course and local residents.
Solution
The Manatee County
