CH2M Hill provided the interface with the Wisconsin DNR relative to funding for an energy efficiency project. The aeration basins blower system consists of five constant-speed, 300-horsepower (hp), multistage, constant speed centrifugal blowers; associated valves; piping; and instrumentation and controls. The blowers have a capacity of 5,000 standard cubic feet per minute (scfm) each. Four of the blowers were installed in 1989, the fifth in 1995. Blower output is adjusted to match treatment process demand with modulating inlet butterfly valves and a 20-year-old control system. The blowers are energy-intensive, and there are opportunities to reduce energy and operating costs by improving the aeration blowers' control system and changing the type, size, or number of blowers in service. To improve the operating efficiency of the aeration system, the City is replacing two of the five 5,000-scfm blowers with two, 5,000-scfm high-speed turbo blowers with adjustable frequency drives. Click Here For Complete Article Text
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