Operational Conditions affecting Biohythane Production and its Kinetic Model: A Review

Recently, the global carbon footprint issue is rising significantly due to fossil fuel demand. Biohythane, which is produced from anaerobic digestion is found as an alternative fuel to address this problem. Even though quite a number of reviews have been done before on biohythane production process, an in-depth review particularly on biohythane kinetic study is not available until now. Therefore, this review paper discusses the general anaerobic digestion process of biohythane production as well as its operating factors such as temperature, pH, and microbial population in improving the productivity. In addition, this paper also discusses kinetics modeling, which is commonly used in biohythane production to improve or analyse the effect, relationship, and function of the parameter, as well as to investigate the performance of biohythane during the process. These kinetic models provide a variety of functional goals depending on the experiment's objective, such as determining the kinetics of cell growth, describing the effect of different operating parameters on biohythane production, studying substrate utilisation and inhibition, and product formation. All models are classified in a table by their equation for further reference.