Proceedings of the International Conference on Applied Sciences and Engineering (ICASE 2023)

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Novel operational strategy of anaerobic processes to recover volatile fatty acids from food wastes

Authors
Meng Sun1, Xi Zhang1, Rajeev Goel2, Bing Liu3, Mitsuharu Terashima1, Hidenari Yasui1, *
1Faculty of Environmental Engineering, The University of Kitakyushu, Kitakyushu, Japan
2Hatch Co., Ltd, Mississauga, Canada
3School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan, China
*Corresponding author. Email: hidenari-yasui@kitakyu-u.ac.jp
Corresponding Author
Hidenari Yasui
Available Online 31 December 2023.
DOI
10.2991/978-94-6463-330-6_17How to use a DOI?
Keywords
Anaerobic processes; Food wastes; Suppression of methanogens; VFA recovery
Abstract

In order to determine the critical pH for acid failure and establish the optimal operating condition for the VFA recovery reactor, the existing model was refined by incorporating a pH suppression equation. Through simulation of experimental data from other researchers, a range of pH parameters were identified that provide safety margins for efficient VFA recovery. For conservative calculations, low pH inhibition parameters (pHUL = 6.41, pHLL = 5.47 and n = 0.23) can be employed for biogas plant operations and process design, providing a safety buffer to prevent acid failure. Alternatively, optimistic curves (pHUL = 5.55, pHLL = 5.11 and n = 0.24) can be utilized to subtract 0.4 d−1 from the specific decay rate of acid-damaged methanogens, ensuring adequate acidification and maximizing VFA yield. Experimental results indicate that the optimal pH range for activity of acid-producing bacteria is between pH 5.5–6.2. This range is also beneficial for VFA recovery as the consumption of VFA by methanogenic bacteria is greatly reduced due to acid inhibition.

Copyright
© 2023 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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Volume Title
Proceedings of the International Conference on Applied Sciences and Engineering (ICASE 2023)
Series
Atlantis Highlights in Engineering
Publication Date
31 December 2023
ISBN
978-94-6463-330-6
ISSN
2589-4943
DOI
10.2991/978-94-6463-330-6_17How to use a DOI?
Copyright
© 2023 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Cite this article

risenwbib
TY  - CONF
AU  - Meng Sun
AU  - Xi Zhang
AU  - Rajeev Goel
AU  - Bing Liu
AU  - Mitsuharu Terashima
AU  - Hidenari Yasui
PY  - 2023
DA  - 2023/12/31
TI  - Novel operational strategy of anaerobic processes to recover volatile fatty acids from food wastes
BT  - Proceedings of the International Conference on Applied Sciences and Engineering (ICASE 2023)
PB  - Atlantis Press
SP  - 125
EP  - 135
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-330-6_17
DO  - 10.2991/978-94-6463-330-6_17
ID  - Sun2023
ER  -