Anaerobic Digestion of Municipal Biowaste for the Production of Renewable Energy: Effect of Particle Size

Abstract

-In recent years, Anaerobic Digestion (AD) has become an important technological alternative for the management of municipal biowaste (MBW) for both pollution control and obtaining renewable energy such as methane. One of the factors that most affects the AD of MBW is the particle size, particularly in the hydrolysis and lag phases, this last being in general the limiting stage of solid waste AD. This research evaluated on a laboratory scale the AD of MBW by evaluating Biochemical Methane Potential (BMP) at a temperature of 30 °C during 30 days and the influence of particle size. The particle sizes ranged between < 2 mm to 12.5 mm. Along the study, better results were observed for particle sizes < 2 mm, obtaining productions of methane and electrical energy of 128 mL gVS -1 and 2960.4 kWh week -1 respectively (19% higher than in reactors with larger particles), thus indicating lower costs for design and maintenance.

The Performance Evaluation on Co-Digestion of Domestic Sewage Sludge and Food Waste for Methane Yield and Kinetics Analysis

“…The results of the correlation coefficient, R 2 ranged from 0.997 to 0.999 was observed by this study, relatively higher than average. On average, the R 2 for co-digestion of sewage sludge and food waste studies were shown to have values ranged from 0.890 to 0.960 [8], [39]. Based on the modeling analysis, the lag phase was not available at all.…”

Recent Advancements in Anaerobic Digestion and Gasification Technology

“…These are known as the limiting stage of adaptation of microorganisms to the substrate. [56]. Towards this, Parra-Orobio et al [56] mentioned that a particle size of <2 mm is recommended and effective for methane production, having an electrical energy of 2960.4 kWh per week.…”

“…[56]. Towards this, Parra-Orobio et al [56] mentioned that a particle size of <2 mm is recommended and effective for methane production, having an electrical energy of 2960.4 kWh per week. The recommended particle size of <2 mm is 19% higher than in reactors with larger particles.…”