Optimizing Anaerobic Co-Digestion Formula of Agro-Industrial Wastes in Semi-Continuous Regime

Ana I. Parralejo, Jerónimo González, Luis Royano and Juan F. González ()
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Ana I. Parralejo: Department of Field Crops: Biomass and Bioproducts, Centre for Scientific and Technological Research of Extremadura (CICYTEX), Counseling of Education, Science and Vocational Training, Junta of Extremadura, 06187 Guadajira, Badajoz, Spain
Jerónimo González: Department of Field Crops: Biomass and Bioproducts, Centre for Scientific and Technological Research of Extremadura (CICYTEX), Counseling of Education, Science and Vocational Training, Junta of Extremadura, 06187 Guadajira, Badajoz, Spain
Luis Royano: Department of Field Crops: Biomass and Bioproducts, Centre for Scientific and Technological Research of Extremadura (CICYTEX), Counseling of Education, Science and Vocational Training, Junta of Extremadura, 06187 Guadajira, Badajoz, Spain
Juan F. González: Department of Applied Physics, School of Industrial Engineering, Avda. de Elvas, S/N, 06006 Badajoz, Badajoz, Spain

Energies, 2025, vol. 18, issue 7, 1-17

Abstract: The actual environmental and energy crises are two of the main problems existing in the world. Among the different technologies that can be implemented is anaerobic digestion, which employs waste and renewable biomass materials. To reach the optimum ratio of different raw materials or substrates in the feed of digesters, laboratory tests are necessary. This work aims to study the increase in the Organic Load Rate (OLR) (1 g VS L −1 d −1 , 2 g VS L −1 d −1 , 3 g VS L −1 d −1 and 4 g VS L −1 d −1 , VS: Volatile Solid) and the raw materials number (sorghum (S), pig manure (P), triticale (T), corn stover (C) and microalgae biomass (M)) in the feedstock of the anaerobic digestion process. Mean values of methane yields for the evaluated set were lower in SMP and SMPTC assays (149.80 L CH4 kg VS −1 and 157.15 L CH4 kg VS −1 , respectively) than SP, SM and SMPT assays (195.09 L CH4 kg VS −1 , 197.69 L CH4 kg VS −1 and 195.76 L CH4 kg VS −1 , respectively). Along the experiments, several parameters were evaluated, along with their interactions with OLR and number of raw materials. Two kinetic models were employed to fit the COD (Chemical Oxygen Demand) removal results.

Keywords: semi-continuous assays; anaerobic digestion; interactions; methane yield; Organic Load Rate (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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