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The Fairfield WPCF is a 9 million gallon per day (mgd) average annual daily flow treatment facility that is located in southwestern Connecticut and discharges directly into Long Island Sound (LIS). The treatment facility was upgraded in 2002 to include low level nitrogen removal as part of the Total Maximum Daily Load (TMDL) for Long Island Sound. The biological nitrogen removal treatment consists of three trains of a four stage suspended growth activated sludge process that include primary anoxic zones followed by aeration with internal nitrate recycle, second anoxic zones with external carbon addition, and reaeration zones. From 2003 until November 2007, Fairfield utilized methanol as the external carbon source for denitrification in the second anoxic zone. The plant operations staff chose to change from methanol to MicroC TM , a proprietary non-flammable, non-hazardous alternate external carbon due to the safety concerns of utilizing a hazardous and flammable liquid onsite and the highly fluctuating cost of methanol.Both Methanol and MicroC TM were shown to improve denitrification when added to the post anoxic zone at Fairfield. MicroC TM can be utilized interchangeably with methanol with no appreciable acclimation period needed or modification to the existing chemical storage and pumping facilities. Introduction:

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The United States Environmental Protection Agency (USEPA) and Massachusetts Department of Environmental Protection (MassDEP) have recently implemented non-point-source, watershedbased nitrogen Total Maximum Daily Load (TMDL) limits for multiple small coastal estuaries around Cape Cod Massachusetts. The TMDLs for the four (4) estuarine systems around the Town of Chatham, Massachusetts, a town with a population of approximately 6,500, are very stringent and require removal of much of the wastewater nitrogen coming from the many individual septic systems, as well as nitrogen from the stormwater and lawn fertilizers, at the many developed properties. Nutrients have been overloading the local estuaries for years causing highly visible eutrophication issues as well as impacts to the groundwater-source drinking water supply. The Town developed a Comprehensive Wastewater Management Plan (CWMP) which utilizes sewer extensions, a wastewater treatment facility upgrade, growth neutral land use controls, stormwater management, and fertilizer reduction research and management to meet the limits.