Flat topography in the Rhode Island city of Warwick requires multiple lift stations and force mains to deliver wastewater for treatment.
Some of the city’s 49 lift stations experienced grease buildup that ultimately restricted flow in force mains and created odors in residential neighborhoods. The Warwick Sewer Authority tried chemical treatments with limited success.Then three years ago, staff members learned about a mixing device offered by C3ND Environmental Consulting, based on technology from Pulsed Hydraulics.After a successful trial at one of the most problematic lift stations, the authority purchased the unit; it has since added eight more. “We had usually cleaned
