A kinetic model for methanogenesis of acetic acid in a multireactor system

Abstract

Bioconversion of acetic acid to methane by a crude culture of methanogens in a continuous multireactor system was investigated. Culture of methanogens was drawn from an active cow-dung digester (12 days) and was grown in a semisynthetic medium (pH 6.3, 37 degrees C) with acetic acid as the sole carbon source. The solubilities of CO(2), HCO(3) (-), and CO(3) (2-) increased with the rise in pH and exercised considerable influence on the gas composition. Various mechanisms for methanogenesis of acetic acid based on the available pathways were considered. Experimental data were compared with these mechanisms, the best fit was determined, and the corresponding rate expression was identified. This mechanism predicted that, of the total methane produced, 72%;comes from acetic acid directly and 28%;via the CO(2) reduction route.

Reviews and syntheses: Four decades of modeling methane cycling in terrestrial ecosystems

“…This classification is used to distinguish them from pure aquatic ecosystems and considering the important role of wetlands in CH 4 cycling. Therefore, models for understanding reactions in bioreactors (Bhadra et al, 1984;Pareek et al, 1999), mining plots (De Visscher and Van Cleemput, 2003), aquatic ecosystems, and marine systems (Elliott et al, 2011) were excluded. An early pioneering effort of multiplying wetland area by average CH 4 flux to estimate global CH 4 budget was excluded from this review as well (Matthews and Fungi, 1987).…”

A mathematical and empirical model of the performance of a membrane-coupled anaerobic fermentor

“…There are many mathematical models of the anaerobic treatment of sewage or wastewater, such as performance curve fits (Young and Dahab 1983), mechanistic models (Bhadra et al 1984;Lindgren 1983), steady-state models (Hanaki and Matsuo 1985;Mosey 1983), and dynamic models that incorporate measurements of substrate diffusion through biofilm (Annachhatre and Khanna 1990;Williamson and McCarty 1976;Suidan and Wang 1985). These models assume operation, ideally, in a continuously stirred tank reactor (CSTR) or under plug-flow conditions.…”

Treatment of automotive industry wastewater using anaerobic batch reactors: The influence of substrate/inoculum and molasses/wastewater

“…For both anaerobic and aerobic studies, a series of substrate removal kinetics models are used: Monod, Contois, Chan-Hashimoto, Grau first and second model, improved Stover-Kincannon, and zero-, first-and second-degree (Kayranlı, 2008). Anaerobic kinetics focuses on various stages of the breakdown of food (Bhadra, 1984;Harper and Suidan, 1991) and Monodtype kinetic models are widely used. These models also used to control and predict the treatment plant operation performance and the results of scale-up pilot studies (Isik and Sponza, 2005).…”