Kinetic comparisons of mesophilic and thermophilic aerobic biomass |
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Authors: | Jaap C T Vogelaar Bram Klapwijk Hardy Temmink Jules B van Lier |
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Institution: | (1) Wageningen University and Research Center, Sub-department of Environmental Technology, Bomenweg 2, P.O. Box 8129, 6700 EV, Wageningen, The Netherlands,;(2) , Paques b.v., T. de Boerstraat 24, P.O. Box 52, 8560 AB, Balk, The Netherlands, e-mail: J.Vogelaar@Paques.nl, Tel: +31-514-608500, Fax: +31-514-603342, url: www.paques.nl, |
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Abstract: | Kinetic parameters describing growth and decay of mesophilic (30°C) and thermophilic (55°C) aerobic biomass were determined
in continuous and batch experiments by using oxygen uptake rate measurements. Biomass was cultivated on a single soluble substrate
(acetate) in a mineral medium. The intrinsic maximum growth rate (μ
max) at 55°C was 0.71±0.09 h−1, which is 1.5 times higher than the μ
max at 30°C (0.48±0.11 h−1). The biomass decay rates increased from 0.004 h−1 at 30°C to 0.017 h−1 at 55°C. Monod constants were very low for both types of biomass: 9±2 mg chemical oxygen demand (COD) l−1at 30°C and 3±2 mg COD l−1at 55°C. Theoretical biomass yields were similar at 30 and 55°C: 0.5 g biomass COD (g acetate COD)−1. The observed biomass yields decreased under both temperature conditions as a function of the cell residence time. Under
thermophilic conditions, this effect was more pronounced due to the higher decay rates, resulting in lower biomass production
at 55°C compared to 30°C.
Electronic Publication |
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Keywords: | Aerobic Decay Kinetics Respirometry Thermophilic |
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