In 2012, the City of Lebanon (Pennsylvania) Authority wastewater treatment plant was upgraded with a smart digital control solution to support its complex operations, minimize energy usage and comply with new effluent total nitrogen limits.
The plant operates a two-stage biological process with an integrated fixed-film activated sludge system added downstream of the existing trickling filters. The IFAS system was selected to fit space limitations. Complementary components — including coarse- and fine-bubble diffusers and geared turbo blowers — provide oxygen, mixing and media scour. Tertiary denitrification filters and carbon feed provide a variable polishing step before discharge.Operating a two-stage biological process
