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Factors influencing volatile fatty acids production from food wastes via anaerobic digestion
University of Borås, Faculty of Textiles, Engineering and Business.ORCID iD: 0000-0002-7387-2358
University of Borås, Faculty of Textiles, Engineering and Business.
Department of Food and Agricultural Product Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia..
University of Borås, Faculty of Textiles, Engineering and Business.ORCID iD: 0000-0002-1456-1840
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2020 (English)In: Bioengineered, ISSN 2165-5979, E-ISSN 2165-5987, Vol. 11, no 1, p. 39-52Article in journal (Refereed) Published
Sustainable development
According to the author(s), the content of this publication falls within the area of sustainable development.
Abstract [en]

Volatile fatty acids (VFAs) are intermediate products in anaerobic digestion. The effect of substrate loading or inoculum to substrate ratio (ISR), the addition of methanogen inhibitor, O2 presence, control the reactor's pH, and inoculum adaptation on the VFAs production from food waste through acidogenesis process was investigated in this study. Addition of 2-bromoethane sulfonic (BES) as methanogen inhibitor suppressed VFA consumption by methanogens at ISR 1:1. At higher substrate loading (ISR 1:3), methane production can be suppressed even without the addition of BES. However, at high substrate loading, controlling the pH during acidogenesis is important to achieve high VFAs yield. Acclimatization of inoculum is also one of the strategies to achieve high VFA yield. The highest VFAs yield obtained in this work was 0.8 g VFA/g VS added at ISR 1:3, controlled pH at 6, with the presence of initial O2 (headspace unflushed).

Place, publisher, year, edition, pages
2020. Vol. 11, no 1, p. 39-52
Keywords [en]
Inoculum to substrate ratio, O2, VFA, anaerobic digestion, inoculum acclimatization, pH control, the inhibitor for methanogens
National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-22456DOI: 10.1080/21655979.2019.1703544ISI: 000505130700001PubMedID: 31880192Scopus ID: 2-s2.0-85077155309OAI: oai:DiVA.org:hb-22456DiVA, id: diva2:1386145
Available from: 2020-01-16 Created: 2020-01-16 Last updated: 2021-10-21Bibliographically approved
In thesis
1. Methane and Volatile Fatty Acids Production from Toxic Substrate
Open this publication in new window or tab >>Methane and Volatile Fatty Acids Production from Toxic Substrate
2020 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Challenges caused by climate change and global warming have created a demand for improvements in resource recovery and the promotion of a circular economy. Waste management is one such challenge for which more recycling options are required for producing materials and energy sources from wastes. Toxic organic waste such as fruit waste has been conventionally disposed into landfills; however, anaerobic digestion can be performed to produce biogas or volatile fatty acids (VFAs) from these wastes.The main objective of this research was to develop an anaerobic digestion method for patchouli oil distillery waste and citrus processing residuals for biogas and VFA production using a membrane bioreactor and two-stage digestion system. To this end, a reverse membrane bioreactor with a membrane-encased mixed culture was used for both one-stage and two-stage digestion. The membrane encasement was used to protect the microorganisms from toxic compounds (e.g., D-limonene or patchouli alcohol). The membrane improved the methane yield of patchouli oil distillery waste (73%) and filtrate from citrus waste digestate from the acidification reactor (50%). Two-stage digestion of citrus waste was improved by performing effluent recirculation from the second-stage reactor into first-stage reactor (79% increase in methane yield).In addition to biogas, VFAs, as intermediate products of anaerobic digestion, are considered as valuable products. A two-stage digestion experiment showed that citrus waste can also be converted into VFAs. However, several factors influencing biogas and VFA production differed between the two processes. Batch experiments of anaerobic digestion were performed to investigate important factors affecting VFA production from citrus waste and food waste (as an example of a non-toxic substrate). The results showed that pH, moderate substrate loading, and inoculum adaptation were significant factors affecting VFA production, whereas additions of a methanogen inhibitor and the presence of oxygen did not significantly affect the VFA yield. At high citrus waste loading, D-limonene loading was also high and negatively impacted the VFA yield.To reduce product inhibition in the anaerobic digestion of citrus waste, a tubular membrane as a cross-flow filtration device was used for downstream processing of VFAs. Continuous extraction of VFAs from the reactor improved the VFA yield by two-fold compared with the reactor in which the membrane was not used. The cross-flow filtration allows the system to remain stable during continuous cake-layer removal, as the highest trans-membrane pressure detected was below 67.5 mbar.

Place, publisher, year, edition, pages
Borås: Högskolan i Borås, 2020
Series
Skrifter från Högskolan i Borås, ISSN 0280-381X ; 104
Keywords
toxic substrate, methane, volatile fatty acid, anaerobic digestion, membrane bioreactor, factor, tubular membrane, two-stage digestion
National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-23037 (URN)978-91-88838-67-4 (ISBN)978-91-88838-68-1 (ISBN)
Available from: 2020-10-08 Created: 2020-03-17 Last updated: 2020-12-18Bibliographically approved

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LukitawesaPatinvoh, ReginaSárvári Horváth, IlonaTaherzadeh, Mohammad J

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