Processing of the liquid fraction
Partial nitrification – autotrophic denitrification ANAMMOX
Objective
Biological conversion of ammonium to nitrogen gas (N2) using a fully autotrophic nitrogen removal treatment, which combines partial nitrification under aerobic conditions and denitrification through anaerobic oxidation of ammonium (anammox)
Inlets
Liquid manure (pig and cattle), products of other processes such as anaerobic (mesophilic) digestion
Efficiency
Nitrogen removal efficiency of 90%. Due to the low rate of sludge production, the fraction of nitrogen assimilated by the biomass is lower than in conventional nitrification-denitrification
Weaknesses
The slow growth of ANAMMOX bacteria can imply long times for starting the reactors;
The effectiveness of the process is affected by the temperature (optimal temperature: 35 °C)
The effectiveness of the process is affected by the temperature (optimal temperature: 35 °C)
Products
Nitrogen gas (N2), sludge
Other outlets
treated water
Consumption
Energy: Low
Water: Not applicable
Reagents: Not applicable
Investment
Not available
Operation
Significant savings in aeration during the nitrification process. Costs: €0.7-1.5/tonne only considering the nitrogen removal treatment
Observations
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Combination with other technologies
1. Mesophilic anaerobic digestion -> Coagulation-flocculation -> centrifugation -> ANAMMOX;
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TRL - 4
Status Consolidated
Complexity High
Information made by:
BETA Tech Center