feature Bio-Methane To Vehicle Fuel By Dan Tonello The Persigo Wastewater Treatment Plant in Grand Junction, Colorado, was designed in the late 1970s and went on line in January 1984. As with most facilities of this era, the treatment plant was equipped with all of the latest technological advancements, including variable frequency drive (VFDs) units on the plant’s main lift pumps, an automated alarm system, and the capability to use methane gas produced in the anaerobic digestion process. All of which sounds pretty good on paper, but 14 | RUMBLES SEPTEMBER 2015 this 35-year old technology was very limited. For instance, the alarm system that notified plant staff of an equipment failure only sounded at the plant site, the VFDs were prone to constant failures and took up an entire 15-foot wall, and the gas recovery system only allowed about 15% of the produced methane to be put to beneficial use. As water and wastewater professionals, it is our responsibility to treat water in the most economical manner possible. Trying to CIVIL ENVIRONMENTAL STRUCTURAL Before the 2014 installation of compressed natural gas condition equipment, excess biogas was burned off with this waste gas burner. A 5.7-mile-long pipeline was installed to deliver biofuel from the wastewater treatment plant to the compressed natural gas fueling site.
RUMBLES - September 2015
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