Problem: The Madison (Wisconsin) Metropolitan Sewerage District in Wisconsin faced disruptions and high maintenance for direct steam injectors in its acid-phase digester system. The 12-year-old injectors could no longer handle the increasing volume and variability of foreign material in the process stream. Frequent plugging and fouling caused by solids larger than two inches meant two three emergency work orders per week.
Solution: The district chose the Hydro-Thermal NOH system (Energenecs), designed to allow particles up to four inches to pass through. The straight flow-through design minimizes clogging, and its compact footprint allows it to be installed in the existing skids with
