The Influence of CO 2 Injection into Manure as a Pretreatment Method for Increased Biogas Production

Bronius Žalys (), Kęstutis Venslauskas, Kęstutis Navickas, Egidijus Buivydas and Mantas Rubežius
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Bronius Žalys: Lithuanian Energy Institute, Breslaujos g. 3, LT-44403 Kaunas, Lithuania
Kęstutis Venslauskas: Faculty of Engineering, Vytautas Magnus University, K. Donelaičio g. 58, LT-44248 Kaunas, Lithuania
Kęstutis Navickas: Faculty of Engineering, Vytautas Magnus University, K. Donelaičio g. 58, LT-44248 Kaunas, Lithuania
Egidijus Buivydas: Lithuanian Energy Institute, Breslaujos g. 3, LT-44403 Kaunas, Lithuania
Mantas Rubežius: Faculty of Engineering, Vytautas Magnus University, K. Donelaičio g. 58, LT-44248 Kaunas, Lithuania

Sustainability, 2023, vol. 15, issue 4, 1-14

Abstract: Manure is considered a by-product or organic waste in cattle, pig, chicken or other animal breeding farms, which can be a valuable product as compost or feedstock for biogas production. The production of biomethane from biogas always copes with the formation of carbon dioxide (CO 2 ) as a by-product. This CO 2 may be recycled through the feedstock as a pretreatment to maximize homogeneity, and improve biogas yield and biogas quality. The CO 2 -pretreatment process of cow manure (CoM), chicken manure (ChM) and pig manure (PM) was performed in the continuously fed agitated reactor at 25 °C temperature and ambient barometric pressure. Biogas yield and composition exploration were performed in an anaerobic continuous feeding digester with controlled mesophilic (37 °C) environmental conditions. The CO 2 pretreated PM, CoM and ChM yielded 234.62 ± 10.93 L/kg VS , 82.01 ± 3.19 L/kg VS and 374.53 ± 9.27 L/kg VS biomethane from feedstock volatile solids, respectively. The biomethane yield from CO 2 pretreated CoM, ChM and PM achieved was higher over untreated manure by +33.78%, +28.76% and +21.78%, respectively. The anaerobic digestion process of tested feedstocks was stable, and the pH of the substrate was kept steady at a pH of CoM 7.77 ± 0.02, PM 8.07 ± 0.02 and ChM 8.09 ± 0.02 during all the experiment. The oxidation-reduction potential after pretreatment was within the optimal range (−255 ± 39.0 to −391 ± 16.8 mV) for anaerobic digestion. This process also had a positive effect on the energy generated from the feedstock, with ChM showing the greatest increase, from 2.38 MJ/kg to 3.06 MJ/kg.

Keywords: biomass treatment; carbon dioxide injection; feedstock; anaerobic digestion; droppings; biomethane (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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