Modeling of the Anaerobic Digestion of Organic Waste for Biogas Production

Abstract

Anaerobic digestion is a biological process in which the organic material is converted by microorganisms to methane and carbon dioxide (biogas) in the absence of oxygen. This process is interesting but the control on industrial scale spontaneous biological reactions requires good knowledge of the phenomena involved. The search for appropriate models to be use in control theory is now a high priority to optimize fermentation processes and solve important problems, such as the development of renewable energy from biodegradable organic waste. The aim of this study is modeling of biokinetics of anaerobic digestion on several aspects such as microbial activity, substrate degradation and methane production. For this, we developed a mathematical model based on mass balances on biomass, the organic substrate and biogas. This model is then simulate on Matlab using the experimental data from the literature and comparison between other models and our experimental results. The sensitivity of the model to the process parameters was study by varying the initial concentration of the biomass and the dose of the organic substrate.

The Effect of Mixing Rate on Performance of Anaerobic Reactor in Methane Production

“…In the process of the AD, changes in biomass concentration consist of different growth phases, including lag phase, exponential growth phase, stationary phase, and death phase. Substrate concentration also has a decreasing trend [23,24], which is consistent with the results obtained in Figure 4.…”

“…The effect of TS concentration in wastewater on methane production rate, power production and effluent COD removal efficiency One of the effective factors in the mixing process is the TS concentration in the system. The initial biodegradable material concentration has a significant effect on the quality and quantity of the substrate, production of methane and bacterial population of the AD process [24]. There is a direct relationship between the TS concentration and the methane production rate [8].…”

Plant-Wide Simulation for a Mega WWTP: A Case Study of Gabal ElAsfar WWTP, Egypt

“…Hydrolysis is not considered a biological process as no metabolism takes place, on the other hand acidogenesis, acetogenesis and methanogenesis are considered metabolic steps 139-2 due to the substrate consumption and conversion by bacteria. Digestion biokinetics can be described by three phenomena: substrate consumption, growth and bacterial decay, methane production and inhibition of bacterial activity [5].…”

Application of monod two-substrate kinetics with an intermediate for anaerobic co-digestion of distillery wastewater and molasses/glycerol waste in batch experiments

“…For the last few decades, researchers on alternative sources of renewable energy for environmental sustainability have been interested in and paid attention by scientists who studied sustainable/renewable energy production from biomass, particularly by anaerobic digestion (AD). The AD process can convert macro-molecular organic matter using microorganisms to methane and carbon dioxide (biogas), which helps to reduce dependency on fossil fuels (Fedailaine et al 2015). The AD process is performed by microorganisms, especially bacteria; degradable organic matter in the absence of oxygen produces biogas, which typically consists of 60% to 70% CH 4 , 30% to 40% CO 2 , and small amounts of other gases (Weiland 2010).…”