Removal and recovery of inhibitory volatile fatty acids from mixed acid fermentations by conventional electrodialysis

Jones, Rhys Jon; Massanet‐Nicolau, Jaime; Guwy, Alan J.; Premier, Giuliano C.; Dinsdale, Richard M.; Reilly, Matthew

doi:10.1016/j.biortech.2015.04.001

Cited by 99 publications

(51 citation statements)

References 35 publications

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“…Separation is complicated due to the low VFA concentration (<10 wt.%) with high solubility in water (Singhania et al, 2013), and the complex fermentation broth with high solid content (Zhou et al, 2018). Several methods have been proposed for recovery of VFAs from AF: nanofiltration (Longo et al, 2015;Zacharof et al, 2016), liquid-liquid extraction (Alkaya et al, 2009;Reyhanitash et al, 2016), adsorption (Rebecchi et al, 2016;Reyhanitash et al, 2017), electrodialysis (Jones et al, 2015;Tao et al, 2016) and membrane extraction (Plácido and Zhang, 2017a;Yesil et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Solvent-free membrane extraction of volatile fatty acids from acidogenic fermentation

Outram

Zhang

2018

Bioresource Technology

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Diversification of anaerobic digestion into higher value products, namely volatile fatty acids (VFAs), is receiving interest. One of the biggest challenges with this is recovery of the VFAs. Membrane extraction can be used, and a novel process configuration using a non-porous silicone membrane and water for an extractant is proposed here. This process would enable the reduction in the number of downstream unit operations compared to other membrane extraction processes. Selective recovery in favour of longer chain VFAs was demonstrated. Testing with a synthetic solution resulted in an overall mass transfer coefficient of 0.088 μm s for butyric acid, and 0.157 μm s when fermentation broth was used. This indicates this process is not hindered by fouling, but improved somehow. Although the preliminary economic analysis showed this process to require a larger membrane area compared to porous membrane alternatives, it also has a significantly reduced cost associated with the extractant.

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Section: Introductionmentioning

confidence: 99%

Solvent-free membrane extraction of volatile fatty acids from acidogenic fermentation

Outram

Zhang

2018

Bioresource Technology

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“…However, this is a chemical energy conversion process rather than a renewable energy process. Furthermore, while the process occurs at a higher rate compared to photo‐fermentation or photolysis, it has a low H 2 yield: substrate use ratio, mainly because of the formation of various volatile by‐products including ethanol, acetic acid, propionic acid and butyric acid (Jones et al ., ), from which H 2 must be purified (Chandrasekhar et al ., ). Production factors such as tight control of the pH, carbon/nitrogen ratio of the substrate and high temperature requirements add additional challenges and operating costs (Jones et al ., ; Wang et al ., ).…”

Section: Other Artificial and Naturally Derived Renewable H2‐productimentioning

confidence: 99%

Challenges and opportunities for hydrogen production from microalgae

Oey

Sawyer

Ross

et al. 2016

Plant Biotechnology Journal

145

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SummaryThe global population is predicted to increase from ~7.3 billion to over 9 billion people by 2050. Together with rising economic growth, this is forecast to result in a 50% increase in fuel demand, which will have to be met while reducing carbon dioxide (CO 2) emissions by 50–80% to maintain social, political, energy and climate security. This tension between rising fuel demand and the requirement for rapid global decarbonization highlights the need to fast‐track the coordinated development and deployment of efficient cost‐effective renewable technologies for the production of CO 2 neutral energy. Currently, only 20% of global energy is provided as electricity, while 80% is provided as fuel. Hydrogen (H2) is the most advanced CO 2‐free fuel and provides a ‘common’ energy currency as it can be produced via a range of renewable technologies, including photovoltaic (PV), wind, wave and biological systems such as microalgae, to power the next generation of H2 fuel cells. Microalgae production systems for carbon‐based fuel (oil and ethanol) are now at the demonstration scale. This review focuses on evaluating the potential of microalgal technologies for the commercial production of solar‐driven H2 from water. It summarizes key global technology drivers, the potential and theoretical limits of microalgal H2 production systems, emerging strategies to engineer next‐generation systems and how these fit into an evolving H2 economy.

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“…The main challenges to be overcome include product inhibition, pH inhibition, and poor selectivity when the production of a certain VFA is targeted. For that purpose, several reaction/separation schemes have been proposed on the basis of the membranes and electrochemical systems such as ED or ion exchange, although further developments to reach industrial application are required . These long‐chain fatty acids can be further used as the basis of a carboxylate platform, which will be able to elongate them to other compounds, such as caproate or bioplastics, with a higher added value.…”

Section: A New and Sustainable Concept Of Wwtps: Recovery Of Energy Amentioning

confidence: 99%

Advanced technologies for water treatment and reuse

et al. 2015

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Removal and recovery of inhibitory volatile fatty acids from mixed acid fermentations by conventional electrodialysis

Cited by 99 publications

References 35 publications

Solvent-free membrane extraction of volatile fatty acids from acidogenic fermentation

Solvent-free membrane extraction of volatile fatty acids from acidogenic fermentation

Challenges and opportunities for hydrogen production from microalgae

Advanced technologies for water treatment and reuse

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