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Methane is a renewable energy source, specifically, a biofuel. As a fuel, methane contains approximately half the energy content of natural gas on a per unit basis. That is, a cubic foot of waste methane gas typically has 500-600 British Thermal Units (Btu), whereas a cubic foot of natural gas contains 1,000-1,100 Btu. Essex Junction Wastewater Facility Background The Village of Essex Junction upgraded its Wastewater Treatment Facility (WWTF) in 1985 to a secondary conventional activated sludge plant with advanced treatment using mesophilic anaerobic digestion. The Village constructed its new plant to serve a “tri-town” area in Vermont that includes the Village of Essex Junction, the Town of Essex, and the Town of Williston. The WWTF has a design flow of 3.3 million gallons per day (MGD) and an average flow of 2.0 MGD. Although a plant of this size is considered small by national standards, the Essex Junction WWTF is one of the ten largest municipal wastewater plants in the state of Vermont. As a municipal wastewater facility, the Essex Junction WWTF is challenged to meet its budget needs without increasing tax rates or sewer rates. Building budget capacity when much of the WWTF’s annual operating budget consists of fixed costs that escalate with inflation is a difficult objective, but one that the WWTF pursues vigorously. Of the WWTF’s $750,000 annual operating budget, 90.5% is made up of only five categories. Figure 1: Major Budget Categories for WWTF Annual Operating Budget • Staffing /Overhead – 4 FTEs (37%) • Sludge Management (23%) • Chemicals (13%) • Electricity (12.5%) • Maintenance (5%) Balance Sludge Mgmt. Maintenance Electric Overhead Chemicals Electric power demand for the WWTF is typically between 150-200kW, though it can be as high as 250kW. Electric usage is approximately 1,000,000 kWh each year, representing approximately $93,000 in annual electric utility costs. As with most municipalities, the WWTF is the most energy intensive facility it owns and operates. The Essex Junction WWTF seeks continuous improvement in all aspects of its business. In 1985, the plant was upgraded to remove phosphorus to 0.8 mg/L and provide seasonal nitrification. A 1998 upgrade was to provide for flow equalization and reduce peak hydraulic demand on the affected treatment operations. This project was a funding priority to protect thePDF Image | Turning Methane into Money: Cost-Effective Methane Co-Generation Using Microturbines at a Small, Rural Wastewater Plant
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