DEMON® anammox treatment technology reduces high-strength ammonia (NH3-N) levels in the reject flows from landfill leachate, industrial streams and dewatering centrate/filtrate from anaerobic digestion. From the specific streams, the treated water returns to the plant influent with up to 70-80% less total nitrogen (TN) loading. This is a continuous deammonification process, using granular, anaerobic ammonium oxidizing bacteria anammox biomass retained by micro-screens.
Compared to traditional nitrification-denitrification methods, which require large amounts of energy (1.8-2.7 kW-hr/lb N), alkalinity and external carbon resources, DEMON uses both ammonia oxidizing bacteria (AOB) and anammox bacteria to efficiently (0.45-0.79 kW-hr/lb N) and reliably remove ammonia and total nitrogen.
The DEMON process consists of two steps occurring within the same reactor. The first step is partial nitritation, converting ammonia to nitrite under low dissolved oxygen levels (typically < 0.5 mg/L). The second step is deammonification, when the anammox bacteria converts residual ammonia and newly formed nitrite into dinitrogen gas (N2) under anoxic conditions. The entire process occurs within a single sludge system with the AOB and anammox bacteria responsible for the majority of the work.
In 2011, Pierce County was exploring wastewater treatment options for dewatered centrate within a $350M facility known as Chambers Creek Regional Wastewater Treatment Plant. This new 170 ML/d (45 MGD) municipal wastewater treatment facility upgrade.
Looking for a more sustainable and economical solution, the facility began evaluating Anammox (Anaerobic Ammonia Oxidation) based side stream treatment. The DEMON® process was identified after the first system was implemented at the Strass, Austria WTP in 2004.
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