Pre-denitrification in biofilters is limited by the amount of easily degradable organic substrate, resulting in relatively high requirements for external carbon. The combination of pre-DN, N and post-DN filters is much more advisable for most municipal wastewaters, because the recycle rate can be reduced and external carbon can be saved. For minimum use of external carbon, 100–150% recycle rate should not be exceeded. Then, approximately 50–60% of the total NO3-N can be depleted in the pre-DN stage. On average, 10 g total (t) COD/g NO3-N were required in the pre-DN stage for denitrification in the pilot and full-scale plant and 0.4–0.5 kg NO3-N/(m3DN d) can be reached without external carbon. As only 40–70% of the COD load is eliminated in the pre-DN, the remaining COD load is removed in the nitrification stage. 1 kg COD/(m3 d) suppresses nitrification rates by approximately 0.1 kg NH4-N/(m3 d). For nitrification rates, >0.5 kg NH4N/(m3 d) at 12°C not more than 2 kg COD/(m3N d) may be eliminated in the nitrification.
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Research Article|
April 01 2007
Potentials and limits of a pre-denitrification/nitrification biofilter configuration for advanced municipal wastewater treatment Available to Purchase
E. Rother;
*Degussa AG, Bio- and Environmental Process Technology, Rodenbacher Chaussee 4, 63457 , Hanau-Wolfgang, Germany (E-mail: [email protected])
E-mail: [email protected]
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P. Cornel
P. Cornel
**Technische Universität Darmstadt (Darmstadt University of Technology), Institut WAR, Section Wastewater Technology, Petersenstr. 13, 64287 , Darmstadt, Germany (E-mail: [email protected]; Internet: http://www.iwar.bauing.tu-darmstadt.de)
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Water Sci Technol (2007) 55 (8-9): 115–123.
Citation
E. Rother, P. Cornel; Potentials and limits of a pre-denitrification/nitrification biofilter configuration for advanced municipal wastewater treatment. Water Sci Technol 1 April 2007; 55 (8-9): 115–123. doi: https://doi.org/10.2166/wst.2007.249
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