The chosen pump needed to be corrosion resistant, erosion resistant, non-clogging, minimal in size, self-priming and reliable.
The final system was installed in 2008. As designed, all wastewater flows to the wet well containing three submersible pumps in parallel—including a lag pump, a lead pump and a spare. They remain totally submerged for maximum cooling, even at the lowest liquid level. Effluent flows from the wet well to the equalization tank and the reactor and into aerobic settling ponds. The wastewater is held in these ponds until required for irrigation. Based on content, the ponds are drained and dredged to remove any sludge buildup.
Simpson has been happy with the system’s reliability. “The pumps have been installed for five years, and during that period, the only maintenance that was required was a single seal replacement.
“Fortunately the warning system advised of the seal failure, and we were able to easily switch to the backup pump while we replaced the seal. There was no slow down or stoppage in production.”
The system keeps the winemaking process moving.