Chapter 6 - Production of volatile fatty acids in biorefineries
Emilia Den Boer , Jan Den Boer
AbstractVolatile fatty acids (VFAs) are one of the potential bioproducts which could be produced from biomass, replacing conventional production based on crude oil refining. VFAs have many applications as chemical building-blocks, as well as substrates for bioplastics production or as biofuels. Early studies of VFAs production usually aim at one particular compound, using mono-substrates (like glucose or other sugars) and applying pure cultures of procuring microorganisms. The more recent investigations focus on applying mixed cultures fermentation and utilizing various, often inhomogeneous waste streams, resulting in a production of a wide spectrum of VFAs. This is a more promising solution from the economic perspective. VFAs are produced during anaerobic digestion processes, under defined conditions. Strategies to enhance generation of VFAs focus on: improving the rate of biomass hydrolysis to produce more soluble substrates for acidification, enhancing the process of acidogenesis, and inhibiting the methanogenesis. Up to date, a number of research projects have been dedicated to study the VFAs production efficiency and composition in relation to process conditions, such as pH, temperature, hydraulic retention time, organic loading, etc. This chapter focuses on the theory related to VFAs production through pure and mixed cultures, including successful means to accumulate VFAs through process control and optimization strategies. It discusses strategies to influence final VFAs composition by shifting it toward longer-chain acids, which facilitates recovery of individual VFAs from the fermentation media.
|Publication size in sheets||1|
|Book||Bhaskar Thallada, Varjani Sunita, Pandey Ashok, Rene Eldon R. (eds.): Waste Biorefinery: Value Addition through Resources Utilization, 2021, Elsevier, ISBN 978-0-12-821879-2, DOI:10.1016/C2019-0-04387-7|
|Keywords in English||volatile fatty acids (VFA), fermentation, anaerobic digestion, biowaste|
|Score||= 20.0, 19-04-2021, MonographChapterAuthor|
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perish system.