Water & Wastewater E-Zine
January 2010
This Month´s Featured Articles, Papers & Reports
Ethanol by-product raises biogas output
In 2007, the City of Fergus Falls, Minnesota undertook a study to evaluate adding thick corn stillage to the anaerobic digesters at its wastewater treatment plant (WWTP). The goal was to determine the potential for codigesting syrup with biosolids to increase biogas production, while avoiding operational and regulatory problems. The Fergus Falls WWTP operates three digesters in series, two primary and one secondary, each with a capacity of 471,000 gallons. The two primary mixed and heated digesters ...
Overcoming iron bacteria problems: An Australian perspective
Iron bacteria are becoming an increasing problem in groundwater bores and are estimated to affect about 40% of the world’s water bores with anecdotal evidence indicating that this number is steadily increasing. Iron bacteria derive energy during their metabolism through oxidising soluble ferrous iron, present in the groundwater, to its insoluble ferric form. The resultant biofilm is commonly found as a slimy or gelatinous deposit and over time these deposits develop into solid encrustations that ...
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