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Biogas from Nitrogen-Rich Biomass as an Alternative to Animal Manure Co-Substrate in Anaerobic Co-Digestion Processes

descriptionPublicationkeyboard_double_arrow_right Article , Other literature type 18 Aug 2022Publisher:MDPI AGJournal:Energies, volume 15, page 5,978 (eissn: 1996-1073,

Authors: Parralejo Alcobendas Ana Isabel; Royano Barroso Luis; Cabanillas Patilla Juan; González Cortés Jerónimo;

doi: 10.3390/en15165978

Biogas from Nitrogen-Rich Biomass as an Alternative to Animal Manure Co-Substrate in Anaerobic Co-Digestion Processes

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Abstract

Nitrogen-rich biomass can be suitable for utilization as a substrate in anaerobic co-digestion (AC-D) instead of animal manure. This biomass combined with other substrates could replace animal waste in certain cases in which animal waste cannot be used to obtain methane gas. Methane is the majority component of the biogas produced in AC-D used as an energy source. In this research, a comparative study has been developed between leguminous plant biomass and pig manure in AC-D in a semicontinuous regime at different Organic Load Rate (OLR) values (1.2–1.8 g VS LD−1 d−1). The most elevated methane yield (494 NL CH4 kg VS−1) belongs to assays developed with nitrogen-rich biomass at 1.4 g VS LD−1 d−1. Methane-yield results of nitrogen-rich biomass are higher than pig manure results for all OLR studied values. The digestate obtained in the AC-D is a fertilizer of interest due to its nitrogen content and ability to save energy by replacing mineral fertilizers.

Keywords

Technology, anaerobic co-digestion; biogas; biomethane; digestate; nitrogen-rich biomass, digestate, T, biogas, nitrogen-rich biomass, biomethane, anaerobic co-digestion

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