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MELTON RECYCLED WATER TREATMENT PLANT MELBOURNE, AUSTRALIA Expecting a doubling of the population in the next 20 years, the township of Melton is one of Australia’s fastest growing municipalities. Faced with this rapid population growth and coupled with an alarming lake and reservoir shortage of 70 percent, executives at Melton’s Western Water-owned wastewater treatment facility needed an innovative way to manage the expanded amounts of future waste in an eco-friendly way. In July 2010, a Capstone C200 microturbine was installed to utilize the previously- wasted anaerobic digester methane biogas. In addition to the 200kW of electricity that reduces the facility’s power consumption by 60 percent, the microturbine produces thermal heat that is captured and then used by the digester in order to improve its efficiency. The 1,700 MW-hours of electricity produced by the turbine each year assists in providing the recycled water and sewage services to 145,000 people served by the plant. A Capstone Heat Recovery module, paired with a supplementary burner, creates 276kW of heat energy and 2.3 million kW-hours of thermal energy while still maintaining the required 35 degrees Celsius (95 degrees Fahrenheit) temperature needed to produce the methane gas. This biogas-fueled CHP system boasts an efficiency as high as 90 percent, easily besting the previous configuration’s stand-alone boiler which hovered between 25 and 30 percent. The environmental impact from the microturbine’s installation and the projected reduction in energy costs secured grants of AUD$750,000 (US$668,000) from Sustainability Victoria and the Department of Sustainability. Western Water officials estimate a reduction of 1,800 tons of greenhouse gas emissions per year, about 7.5 percent of Western Water’s total emissions among all treatment plants. Plant managers predict that cost savings will justify the installation of a second C200 system and ultimately a third as demand increases. The plant itself, with its sophisticated and forward-thinking technology, is expected to serve as a model for similar projects throughout Australia. At Western Water’s wastewater treatment plant in Melton, Victoria, a C200 microturbine burns biogas from the anaerobic digester to produce 1,700MWh of electricity each year. The electricity offsets the plant’s overall power consumption by an estimated 60 percent.PDF Image | 2011 Annual Report Capstone Turbine Corporation
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