Modelling a nitrite-dependent anaerobic methane oxidation process: Parameters identification and model evaluation
2013
He, Zhanfei | Cai, Chen | Geng, Sha | Lou, Liping | Xu, Xiangyang | Zheng, Ping | Hu, Baolan
Nitrite-dependent anaerobic methane oxidation (n-damo) is a recently discovered process that is intermediated by n-damo bacteria that oxidize methane with nitrite to generate nitrogen gas. In this work, a kinetic model based on Monod type kinetics and diffusion-reaction model was developed to describe the bioprocess. Some key kinetic parameters needed in the model were obtained from a series of batch activity tests and a sequencing batch reactor (SBR) operation over 100days. The growth rate, decay rate, methane affinity constant, nitrite affinity constant and inhibition constant were 0.0277±0.0022d⁻¹, 0.00216±0.00010d⁻¹, 0.092±0.005mmolL⁻¹, 0.91±0.09mmolL⁻¹ and 4.1±0.5mmolL⁻¹ for n-damo bacteria at 30°C, respectively. The results showed that the model could simulate actual performance of the SBR in the first 76days, that methane was not a limiting factor at atmospheric pressure for its high affinity, and that the optimum nitrite concentration was 1.92mmolL⁻¹.
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