Anammox Treatment Technology

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.

Efficient Shortcut Nitrogen Removal

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 nitrogen 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.

Process Flexibility

Often implemented as a continuous operation, the DEMON anammox process can also be designed as a sequencing batch reactor (SBR). However, a continuous operation is preferred as it reduces the overall horsepower requirements for installed blowers and pumps while higher specific loading rates enable smaller reactor volumes.

System Resilience

The proven DEMON anammox process system controls and physical separation techniques are unique to the system. It facilitates anammox bacteria growth and retention while decoupling the mixed liquor suspended solids (MLSS) solids retention time (SRT) of the AOB and nitrite oxidizing bacteria (NOB). As an automated process, it requires minimal oversight from plant operators.

Carbon Neutral

DEMON sequesters greenhouse gasses and outperforms traditional ammonia removal processes in terms of sustainability.


  •  Most cost-effective total nitrogen (TN) removal method on the market
  • Saves over 60 percent of energy
  • Produces 90 percent less sludge
  • Carbon neutral operation
  • Enables quick project startups with the available seed sludge
  • Can be retrofitted to existing tanks
  • Operates at minimal dissolved oxygen levels

Case Studies


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