Deammonification - substantial new biological energy saving method for nitrogen removal in industrial wastewater
The object of the project is to develop a new treatment process for nitrogen removal, primarily to be used in wastewater treatment in the industry. The deammonification process offers a substational reduction in energy consumption and thus reduces the emission of CO2 as compared to conventional processes.
The main objectives are to develop new nitrogen removal processes in wastewater treatment based on deammonification for industrial mainstream and municipal side stream processes. The processes are cost effective and decrease energy consumption to aeration to approx. 1/5 of conventional nitrification/denitrification and thereby decrease the carbon oxide emission. Carbon is not used as energy source in this process. The deammonification process consists of a combination of ammonia oxidation to nitrite (nitritation) and anaerobic ammonium oxidation, 'Anammox', which leads to directly degradation to N2. This biological conversion is a reaction of ammonium as electron donor and nitrite as electron acceptor. This reaction will generate energy for growth of microorganisms being able to catalyse this reaction. To improve the effectiveness of the process a functional separation of nitritation and N-elimination in a two-step operation activated sludge concept shall be developed. A functional combination in fixed biofilm has been confirmed, but no scientifically investigations for the process applicability in activated sludge has been done. The research will be based on pilot tests on anaerobic pretreated industrial wastewater and digester supernatant side stream on municipal WWTP. The results, which will be process models will be used for full scale outline projects for the WWTP at CP Kelco and Herning WWTP
Further more this process will reduce the need for external carbon. Conventional nitrogen removal processes has a high energy consumption for aeration. This consumption will typically contribute with 70-80% of the total consumption in industrial treatment plants. The deammonification process will in theory use only 1/5 of this. This has been shown in pilot plants using biofilm technology, and it is the object of the project to prove this using activated sludge technology. Different technologies using activated sludge and biofilm has been chosen for the project. After some initial practical problems it succeeded to establish nitritation (1s"t part of the process) in 2 of 3 pilot plants at CP-Kelco and in Herning Wastewater treatment plant. The anammox process (2"n"d part of the process) has been clearly observed in 2 pilot plants using biofilm. At the activated sludge plant at CP-Kelco it was possible in medio December to observe a nitrogen elimination based on anammox-processes. The process was very unstable and stopped several times. In the experiments was found key figures for temperature, pH-value, substrate concentration as well as several other operational parameters. Models for process calculations has been formulated to be used for process optimizing and dimensioning
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Participants
| Partner | Subsidy | Auto financing |
|---|---|---|
| Envicare ApS, Skødstrup (DK) | ||
| Herning Kommune, Herning (DK) |
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