Evaluation of Biogas Production Performance During the Anaerobic Digestion of Lipids with Four or More Double Bonds
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The purpose of this study was to investigate the influence of the feed to microorganism ratio (F/M ratio) on the biogas production during the high-efficiency anaerobic digestion of lipids, where 50% of lipids contained four or more double bonds.
Biochemical methane potential tests were performed at five different F/M ratios, 0.2, 0.4, 0.6, 0.8, and 1.0, under mesophilic conditions. The biogas production patterns, lag-phase, total volatile fatty acids to volatile solid ratio (VFA/VS ratio), and time required for 90% biogas production (T90) were used to evaluate biogas production based on the biochemical methane potential tests.
Biogas production started after 4 days of digestion in all the digesters. The biogas production pattern at an F/M ratio of 1.0 was observed to be different to that previously reported. The methane content was in the stabilized range of more than 50% at all F/M ratios. The T90 was reduced at F/M ratios lower than 0.6.
The lag-phase of anaerobic digestion of lipid with four or more double bonds could be reduced by using an F/M ratio lower than 0.6 and an initial VFA/VS ratio lower than 11%.
KeywordsAnaerobic digestion Biogas production Long chain fatty acid BMP test Lag-phase
This study was supported by 2017 Research Grant from Kangwon National University (520170195) and partially supported by BK 21 plus (No. 31Z20130013003) and NRF-2017R1A2B4010015.
Compliance with Ethical Standards
Conflict of Interest
The authors declare that they have no conflict of interests.
- APHA. (1998). Standard methods for the examination of water and wastewater (20th ed.). Washington, DC: American Public Health Association.Google Scholar
- Kim, S. A. (2018). Biogas production performance according to the type of fatty acid. MS thesis. Kangwon, Rep. Korea: Department of Horticulture and Biosystems Engineering, Kangwon National University.Google Scholar
- Nordmann, W. (1977). Die Überwachung von Schlammfaulung, KA-Informationenfür das Betriebspersonal. Beilagezur Korrespondenz Abwasser 3(77).Google Scholar
- SPSS. (2015). Statistics. Ver. 21. Chicago: IBM SPSS Statistics Inc..Google Scholar
- VDI. (2006). 4630: Fermentation of organic materials, characterisation of substrate, sampling, collection of material data, fermentation tests. Berlin: Verein Deutscher Ingenieure.Google Scholar