Case Study: Hollywood, FL
The South Regional wastewater treatment plant (WWTP) is owned by the city of Hollywood, Florida, primarily serving Hollywood and surrounding communities. The South Regional WWTP is an activated sludge facility that produces 60 tons of dry solids per day. The sludge is dewatered with six 2 meter Andritz belt filter presses to approximately 16 % total solids.
Sludge was being disposed at regional landfills until Florida changed its environmental regulations to protect the Okeechobee/Everglades watershed and to encourage reuse of biosolids. This substantially increased fees for disposing of biosolids.
The South Regional WWTP installed an alkaline stabilization facility in the 1990s, but it was decommissioned when neighbors complained about the odor and noise.
The retrofit of the Schwing Bioset stabilization system required demolition of all of the legacy equipment save the truck loading equipment and the lime handling equipment, which consisted of two 3500 cubic foot bulk storage silos and a pneumatic conveyance system.
Installation proceeded close to schedule; the only surprises were hurricanes Francis, Ivan, and Jeanne, as well as a pneumatic lime system that proved to need an overhaul of the rotary and diversion valves, replacement of the silo dust collectors, and replacement of silo isolation knife gate valves.
The facility has been in operation since February 2005 and over 200,000 wet tons of biosolids have been processed to a very positive response: fugitive dust and sludge spills, as occurred with the earlier equipment, are gone, and the new Bioset equipment controls odors. It’s gone so well that the disposal contract has been renewed for the next 5 years.