Chandran, Kartik

De Clippeleir, Haydée

De Mulder, Chaïm

Murthy, Sudhir

Nopens, Ingmar

Park, Hongkeun

Seuntjens, Dries

Vlaeminck, Siegfried

English

Ghent University Academic Bibliography

Investigating AOB and NOB kinetic parameters for oxygen under moderate climate wastewater conditions  Dries Seuntjens1, Chaïm De Mulder1, Haydée De Clippeleir2,3, Sudhir Murthy2, Hongkeun Park3, Kartik Chandran3, Ingmar Nopens4, Siegfried E. Vlaeminck1  1 LabMET Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, 9000 Gent, Belgium   2 DC Water Authority, 5000 Overlook Ave. SW, Washington DC 20032, USA 3 Columbia University Department of Earth and Environmental Engineering, Columbia University, 500 West 120th Street, New York, NY 10027  4 BIOMATH, Department of Mathematical Modelling, Statistics and Bioinformatics, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium  To date, almost all reported kinetic parameters of ammonia and nitrite oxidizing bacteria (AOB and NOB) for oxygen are measured at temperatures higher than 20°C. The oxygen competition between these two groups of organisms at lower temperatures is however of great interest for the realization of a nitrite shunt in municipal wastewater treatment. This study investigated the temperature dependency of AOB and NOB oxygen Monod kinetics, i.e. R_max and K_O2. Nitrifying sludge originating from a sewage treatment plant (Breda, NL) was sampled over the temperature range of 10.5-17.2°C. The sludge contained AOB Nitrosomonas as detected by Illumina, and NOB genera Nitrospira and Nitrobacter, as revealed by qPCR. The Arrhenius temperature relationship, with R_maxT = R_maxTref* θ^(T-Tref), was fitted to the Rmax data (Tref=13.9°C). The results yielded θ values that were in line with literature values: θ=1.11 (R2=0.81), for AOB and θ=1.06 (R2=0.53) for NOB. Surprisingly, AOB R_max rates were higher than NOB R_max rates over the whole temperature interval, which is in contrast to typical activated sludge. For K_O2 values, no good temperature relationships were found. In contrast to textbook knowledge, the results showed a higher K_O2 for AOB (0.55-2.43 mg O2/L) compared to NOB (0.12-0.84 mg O2/L). Overall, the obtained biokinetic parameters provide further insight for a better process modeling and control towards achieving energy-neutral wastewater treatment. 

Investigation AOB and NOB kinetic parameters for oxygen under moderate climate wastewater conditions

https://biblio.ugent.be/publication/5788187/file/5788202

Investigation AOB and NOB kinetic parameters for oxygen under moderate climate wastewater conditions

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