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Case Study dependent on weather and plant conditions. Dosing begins immediately upon any visual indication of foaming. Dosage is easily regulated by controlling the outlet valve of the mechanism. The initial cost of the device was $225. The monthly expense of this system has averaged $95. In conclusion, filamentous foaming is an operating problem associated with BNR facilities. Through operator ingenuity, and using an established system, the Kalispell WWTP was able to control its foaming problem efficiently and inexpensively. 1. Jenkins, D.; Richard, M.; Daigger, G.T. (1993) Manual on the Causes and Control of Activated Sludge Bulking and Foaming, 2nd ed.; Lewis Publishes: Chelsea, Michigan. 2. Richard, M. (1989) Activated Sludge Microbiology. Water Pollution Control Federation: Alexandria, Virginia. 3. Wanner, J. (1994) Activated Sludge Bulking and Foaming Control. Technomic Publishing: Pennsylvania. 4. Water Environment Federation and the American Society of Civil Engineers/ Environmental and Water Resources Institute (2006) Biological Nutrient Removal (BNR) Operation in Wastewater Treatment Plants; Alexandria, Virginia. At the end of the aerated zone of the biological reactor, foam can be seen accumulating throughout the tank, especially at the outlet. inserted into a perforated 3-inch PVC pipe fitted with a perforated plastic shower drain at the bottom to form a basket. The basket is inserted into the top of a 4-inch PVC pipe and is plumbed into the spray-bar system to mix in-line with nonpotable water. Within three days, without change in weather, SRT, etc., there was a noticeable difference. The amount of chlorine tablets used (dosage rate) is Rebecca J. Bodnar's background is in environmental science and geochemistry. She is the City of Kalispell's chemist and industrial pretreatment coordinator. Bodnar works at Kalispell's Advanced Wastewater Treatment Plant and for five years has assisted in plant operation and protecting Montana's water resources. Together, Meeting the Challenges of Clean Water Are you looking for ways to increase biological process throughput and performance, protect the integrity of your plant and collectors from sulfides corrosion, improve dewatering and decrease energy consumption? Let us help you solve these challenges and much more. At Kemira, we aim to be a leading water chemicals supplier for raw and waste water applications, serving municipalities and water intensive industries. Together with our customers, we apply our knowledge and expertise to develop innovations that address the sustainable future of water. Please visit us at WEFTEC 2013 Annual Conference and Exhibition Booth # 4912 and let our experts show you how we are addressing the challenges of clean water. Tel. +1 800 842 7424 usinfo.wateronline@kemira.com kemira oyj kemira group wateronline.com ■ Water Online The Magazine 37