Anaerobic Co-digestion of Pre-hydrodynamically Cavitated Aerobic Granular Sludge with Waste Fats – the Importance of Substrate Ratio and Fermentation Temperature

Published: Jan. 29, 2024

The characteristics of excess aerobic granular sludge, related to its structure and chemical composition, limit the efficiency anaerobic digestion. For this reason, pre-treatment methods compositions with other organic substrates are used. aim research was determine effects co-digestion pre-hydrodynamically cavitated sludge waste fats on methane fermentation under mesophilic thermophilic conditions. addition improved C/N ratio increased value 19. greatest were observed in digestion at 55°C, where a 15% fat content volatile soilds ensured. This resulted production 1278.2±40.2 mL/gVS biogas 889.4±29.7 CH4. CH4 69.6±1.3%. increase yield compared pure AGS 34.4% 40.1%, respectively. An proportion substrate had no significant effect fermentation.

Language: Английский

Assessing the Impact of Organic Loading Rate on Hydrogen Consumption Rates during In Situ Biomethanation

Energies, Journal Year: 2024, Volume and Issue: 17(11), P. 2490 - 2490

Published: May 22, 2024

Biogas upgrading via biomethanation has been extensively studied recently, but the influence of organic loading rate on process performance remains to be fully understood. This is particularly significant because both and hydrogen injection can lead volatile fatty acid accumulation during anaerobic digestion. study investigated impact a wide range rates (from 1.25 3.25 g VS/L/d) consumption rates, accumulation, microbial communities in situ biomethanation. It also provided kinetics data metabolite production for different control reactors, including digestion, ex biomethanation, endogenous reactors. Hydrogen was injected into parallel batch reactors using digestate from semi-continuous lab-scale reactor subjected increasing (1.25–3.25 as an inoculum. The inoculum well adapted each tested rate. experiments were replicated following 12 h starvation period assess stability rates. High values resulted increased peaking at 68 mg COD/L/h VS/L/d (maximum value tested), with no despite high partial pressures. maintained after period. Furthermore, addition substrate did not (i.e., similar). A higher relative abundances hydrogenotrophic methanogens Methanospirillum sp.). highlights that accelerate consequently reducing capital operational costs.

Language: Английский

Editorial: Special Issue “From Waste to Energy: Anaerobic Digestion Technologies”

Energies, Journal Year: 2024, Volume and Issue: 17(21), P. 5420 - 5420

Published: Oct. 30, 2024

Anaerobic digestion (AD) has become a cornerstone in the global pursuit of sustainable energy solutions and effective waste management [...]

Language: Английский