An analysis of bio-digester substrate heating methods: A review

Makamure, Francis; Mukumba, Patrick; Makaka, Golden

doi:10.1016/j.rser.2020.110432

Cited by 19 publications

(1 citation statement)

References 24 publications

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“…Still, understanding the mechanisms and thermal exchanges of the biodigester with the interface environments is necessary (Mahmudul et al, 2021). Studies indicate that heating the effluent inside the biodigesters can increase biogas production, as well as reduce hydraulic retention time (HRT), eliminate pathogens, and ensure stability of biogas production throughout the year (Makamure et al, 2021). Therefore, studying heat transfers between internal and external components of biodigesters, considering the heated effluent, allows for assessment of whether the resident biomass is capable of maintaining temperature throughout the day, as well as quantifying rates of energy gain and loss between the heated effluent, biogas, soil, and external environment.…”

Section: Introductionmentioning

confidence: 99%

Thermal Exchanges in a Covered Lagoon Biodigester Treating Pig Farm Effluent Heated by Solar Energy

et al. 2023

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Covered lagoon biodigesters are widely used in Brazil for treatment of agro-industrial effluents; however, under natural conditions, they operate at temperatures below the ideal. Thus, external sources for heating the effluent can enhance reactor performance and optimize thermal exchanges between the biodigester and the environment. This study aimed to evaluate the thermal exchanges in the internal and external environments of a covered lagoon biodigester from the influence of effluent heating through solar energy. Mathematical modeling (EnergyPlus software) was used as a tool to simulate thermal exchanges and obtain heat transfer rates. To do so, two scenarios were considered: with and without heated effluent. The results showed that solar radiation is the primary source of heating for anaerobic reactors and that the high thermal inertia of the soil contributes to a small variation in temperature of the resident biomass over the course of the day, even in the scenario with heated effluent. The temperature of the resident biomass reached and stabilized at 30°C, even after thermal exchanges with biogas and soil, in both hot and cold periods when heating was applied.

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Section: Introductionmentioning

confidence: 99%