CLIENT: Glasgow Wastewater Treatment Plant LOCATION: Glasgow, MT BACKGROUND Meeting stringent regulatory requirements, especially for Ammonia limits, can be a daunting task for any wastewater treatment system, especially those located in cold climates where nitrification is adversely affected by winter temperatures. Add in the potential cost of a new treatment plant and the expertise required to operated a complicated mechanical system, and many rural communities are faced wi
CLIENT: Kiron Wastewater Treatment Plant LOCATION: Kiron, IA BACKGROUND The City of Kiron, a small, rural community in Crawford County, IA, was faced with the decision to upgrade or replace its mechanical treatment plant in order to meet more stringent effluent requirements. With farmland at a premium, the city had to balance the expense of upgrading a mechanical plant with the cost of purchasing additional land for a more passive type of treatment process. LET SOLUTION Lemna
Cold climates present serious difficulties for biological wastewater treatment. Falling temperatures produce lowered biological activity in lagoons, which re- sults in lower BOD removal rates. Total nitrogen removal and ammonia removal rates also decline as air and water temperatures decrease. Ammonia removal is a particular challenge. Ammonia is removed from lagoon-based wastewater treatment systems through several processes, including oxidation by nitrifying bacteria into n
A treatment process with aerobic and anaerobic cells and a polishing reactor enables a plant in northwest Iowa to meet ammonia permit levels. The three-cell, 6-acre aerated lagoon at the Remsen (Iowa) Wastewater Treatment Plant could not meet new ammonia permit levels of less than 4 mg/l in winter and 2 mg/l in summer. The lagoon averaged 14 mg/l in summer and 27 mg/l in winter. Each 12-foot-deep cell held 5 million gallons, but the primary cell had 6-feet of sludge in areas.
In January 2007, the town of Troy, New Hampshire completed a lagoon upgrade designed to meet ammonia nitrogen limits imposed in their reissued NPDES discharge permit. The plant was required to meet a summer limit of 8.7 mg/l from May 1st through September 30th and a winter limit of 13.2 mg/l from October 1st through April 30th. The Troy lagoons were originally constructed in 1983 and consisted of three aerated cells utilizing a combination of an older style fine bubble tubing
Lemna Environmental Technologies, Inc. (LET) was distinguished for its "groundbreaking water infastructure design" in an American Council of Engineering Companies (ACEC) Magazine article, published in their March/April 2006 issue. The wastewater treatment plant highlighted in the ACEC article was an existing lagoon system that no longer performed to the new environmental regulations for ammonia in Jasonville, Indiana. The ammonia removal process, which is difficult in any was