Size: 4,000 m3/d (1 MGD)
Key objectives: modular and compact; retrofit; water reuse
When the City of Lake Alfred decided to upgrade their existing trickling filters plant, the effectiveness of the new process was critical as the effluent was to be locally reused for citrus grove irrigation. The process also needed to be compact and utilize some of the existing infrastructure. The USBF® process was selected to meet these objectives.
As part of the upgrade, the plant was provided with a new integrated headworks system, which screens the influent, washes and dewaters the screenings, removes sand and grit, and deposits compacted screenings and grit into separate bins. From the headworks system, screened influent flows to the equalization tank, which was converted from an existing trickling filter tank.
Biological treatment and first-stage filtration takes place in the USBF® bioreactors. Drum microfilters are utilized for effluent polishing, and the existing sand filters were converted to a second chlorine contact chamber to increase the disinfection capacity.