Legume as Vegetal Nitrogen Source with Olive Mill Wastewater for Methane Production Through Two-Stage Anaerobic Co-Digestion Process

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

Energies, 2025, vol. 18, issue 18, 1-10

Abstract: Energy security fosters the development of biogas, particularly in the context of the rapid energy transition. Substrates suitable for anaerobic digestion serve as feedstocks to produce biogas. Determining the optimal feedstock ratio is a key factor for achieving viable anaerobic digestion (AD) processes with high methane yields. This study evaluated different two-stage AD assays using biomass from a leguminous crop (Lupinus Albus, lupin) and olive mill wastewater (OMW). The highest methane yields were obtained in assays with higher proportions of lupin in the feed mixture (532 L kg VS −1 and 522 L kg VS −1 ) and at a higher Organic Load Rate (OLR) evaluated (510 L kg VS −1 ). Moreover, the presence of OMW in the feedstock significantly increased the Volatile Fatty Acid (VFA) concentration, as observed in the assay.

Keywords: two-stage anaerobic digestion; legume crop; volatile fatty acids; olive mill wastewater (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
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1996-1073/18/18/4973/pdf (application/pdf)
https://www.mdpi.com/1996-1073/18/18/4973/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:18:y:2025:i:18:p:4973-:d:1752953

Access Statistics for this article

Energies is currently edited by Ms. Cassie Shen

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().