Bulking agent in dry anaerobic digestion as a key factor for the enhancement of biogas production
Metadatos
Mostrar el registro completo del ítemAutor
Carvajal, Andrea; Sepúlveda, Claudio; Navia, Daniel; Poblete Castro, Ignacio; Pinto-Ibieta, Fernanda; Serrano Moral, AntonioEditorial
Elsevier
Materia
Acidification Bean peel Food waste
Fecha
2024-05-13Referencia bibliográfica
Carvajal, Andrea, et al. Bulking agent in dry anaerobic digestion as a key factor for the enhancement of biogas production. New BIOTECHNOLOGY 82 (2024) 65–74 [10.1016/j.nbt.2024.05.002]
Patrocinador
National Agency of Investigation and Development to the project ANID FONDECYT Regular nº1210032 and InES Gener USM INGE210004; Spanish Ministry of Science and Innovation through the project TED2021–129599B-I00; Economic Transformation, Industry, Knowledge, and Universities Department of the Andalucia Autonomous Government for Emergia fellowship (EMERGIA20_00114)Resumen
Dry anaerobic digestion (dry-AD) is an attractive process for solid wastes such as agri-food waste. However, some
limitations mainly associated to lack of effective mixing, can hinder the methane production capacity of the
systems. Bulking agent (BA) has been proposed as a solution to the compaction issues in systems without mechanical
agitation, such as leaching bed reactors. However, effects of BA are still not clear, and, thus, the factors
to consider for its dose has not been optimized yet. This work studies the effect of BA in dry-AD. Two substrates
with different characteristics were proposed as models, bean peel as a lignocellulosic substrate and a mixture of
food waste as a readily biodegradable substrate. Inert plastic rings were used as BA at different BA:S ratios.
Assessed BA:S ratio did not affect the performance of methane production for the lignocellulosic waste, but it did
significantly affect to the easily biodegradable substrate, showing up to a 28% of methane production increase.
This result could be due to the presence of lignocellulosic compounds in the bean peel, behaving like a natural
BA. In assays with an increased bed height, the compaction of the system was more severe, resulting in the rapid
acidification of the processes. At these conditions, the positive effect of BA addition was more marked, allowing
methane production and no acidification of the system. Thus, the addition of BA is a suitable strategy for
improving methane production or stability in dry-AD systems without requiring the stirring of the systems.