Energy Efficiency and Recovery Opportunities Analysis for Municipal Wastewater Treatment Plant Operations

In the United States, electric power costs can account for more than forty percent of a wastewater utility’s operating and maintenance budget. Tracking energy usage, especially if it can be tied to the achievement of specific water quality goals, represents a valuable decision-making tool for wastewater officials. The Central Weber Sewer Improvement District (CWSID), which is one of the largest utilities in the state of Utah, provides sewer treatment services to nearly 250, 000 residents. In 2012, the CWSID completed a significant plant upgrade that effectively increased its wastewater treatment plant capacity from 45 MGD to over 90 MGD. An overarching concern at the CWSID was the significant increase in energy consumption associated with the utility upgrade and whether long-term opportunities for improved energy efficiency could be identified.