The paper presents a systematic study of simulations, using a previously calibrated Colloid model, from which it was found that: (i) for pure moving-bed biofilm reactor (MBBR) processes with tertiary nitrification conditions (no influent chemical oxygen demand (COD)), dissolved oxygen = 5 mg/L and residual NH4-N > 4 mgN/L, a nitrification rate of 1.2 gN/(m2d) was obtained at 10 °C. This rate decreases sharply when residual NH4-N is lower than 2 mgN/L, (ii) for MBBR systems with predenitrification–nitrification zones and COD in the influent (soluble and particulate), the nitrification rate (0.6 gN/(m2d)) is half of that in tertiary nitrification due to the effect of influent colloidal XS (particulate slowly biodegradable COD) and (iii) for integrated fixed-film activated sludge (IFAS) processes the nitrification rate in the biofilm (0.72 gN/(m2d)) is 20% higher than for the pure MBBR due to the lower effect of influent XS since it is adsorbed onto flocs. However, it is still 40% lower than the tertiary nitrification rate. In the IFAS, the fraction of the nitrification rate in suspension ranges from 10 to 70% when the aerobic solids retention time varies from 1.4 to 6 days.
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Research Article|
February 03 2014
Validating the Colloid model to optimise the design and operation of both moving-bed biofilm reactor and integrated fixed-film activated sludge systems
J. Albizuri;
1Environmental Engineering Department, CEIT and Tecnun (University of Navarra), Manuel Lardizabal 15, 20018 San Sebastian, Spain
2AnoxKaldnes AB, Klosterängsvägen 11A, 22647 Lund, Sweden
E-mail: jon.albizuri@anoxkaldnes.com
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P. Grau;
P. Grau
1Environmental Engineering Department, CEIT and Tecnun (University of Navarra), Manuel Lardizabal 15, 20018 San Sebastian, Spain
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M. Christensson;
M. Christensson
2AnoxKaldnes AB, Klosterängsvägen 11A, 22647 Lund, Sweden
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L. Larrea
L. Larrea
1Environmental Engineering Department, CEIT and Tecnun (University of Navarra), Manuel Lardizabal 15, 20018 San Sebastian, Spain
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Water Sci Technol (2014) 69 (7): 1552–1557.
Article history
Received:
July 02 2013
Accepted:
January 21 2014
Citation
J. Albizuri, P. Grau, M. Christensson, L. Larrea; Validating the Colloid model to optimise the design and operation of both moving-bed biofilm reactor and integrated fixed-film activated sludge systems. Water Sci Technol 1 April 2014; 69 (7): 1552–1557. doi: https://doi.org/10.2166/wst.2014.058
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