This energy audit project involved developing an existing energy usage budget for each major component of this facility — including pumping, process equipment, lighting, and heating — and analyzing potential options for reducing usage within each of these categories.
Energy saving opportunities such as operational changes, water use reduction, pump efficiency improvements, and building envelope changes were identified based on site investigations and discussions with the city’s management and operations staff. Our firm evaluated these opportunities using real data and information obtained from the three sites. Implementation costs for various options were developed and simple payback periods for each potential option were presented in a comprehensive final report.
As part of this project, a detailed on-site pump testing program was implemented in order to assess pump and motor efficiency as well as operational techniques. Power, flow, and pressure measurements were all obtained using portable monitoring equipment in order to compare actual pump operation to published performance pump curves. UV reactors were also assessed as part of the power measurements.
The city’s overall energy bill for these facilities was reduced by an estimated 15% with a relatively small amount of capital investment. Other benefits to this audit included a reduction in chemical usage, an increased life cycle on equipment, and potential operational cost reductions at the city’s wastewater treatment plant.