Wastewater from the production of lactic acid bacteria as feedstock in anaerobic digestion

Ciro Vasmara, Rosa Marchetti and Domenico Carminati

Energy, 2021, vol. 229, issue C

Abstract: In this study, the biogas production from two fermentation wastewaters deriving from the cultivation of two strains of lactic acid bacteria on ricotta cheese exhausted whey was evaluated in mono-digestion or co-digestion with pig slurry. Lactic acid bacteria were: Lactococcus lactis subsp. lactis and Streptococcus thermophilus. Anaerobic digestion was carried out in laboratory mesophilic, batch, static conditions. Biogas production was monitored until exhaustion. Methane yield of the fermentation wastewaters in mono-digestion was, on average, 372 mL CH4 g−1 VS, and 416 mL CH4 g−1 VS in co-digestion. These values are comparable with that of other feedstocks currently used for biogas production. The co-digestion halved the duration of anaerobic digestion. The fermentation wastewaters are suitable feedstocks for biogas production, and it is possible to directly mix them with pig slurry in existing plants. The digestate could be used as crop fertilizer from a renewable source.

Keywords: Biorefinery; Biogas; Co-digestion; Lactic acid; Lactic acid bacteria; Wastewater (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544221009889
Full text for ScienceDirect subscribers only

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:eee:energy:v:229:y:2021:i:c:s0360544221009889

DOI: 10.1016/j.energy.2021.120740

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().