From May through October, trickling filter flies (Psychoda alternata) and odors plagued the Cullman (Alabama) Wastewater Treatment Plant and residents of a 50-home subdivision across the fence line.
At a January 2019 City Council meeting, homeowners said mild and intermittent odors had always wafted over their neighborhoods. Since 2017, however, the odors had become more frequent, the stench was putrid, and swarms of flies drove them inside on warm evenings.
Jeff Adams, superintendent of the multistage 4.75 mgd (design) trickling filter plant, was desperate for help. He called Tony Glover, the county extension coordinator. Glover called Ron Trygar, a senior training
