Anhydrous volatile fatty acid extraction through omniphobic membranes by hydrophobic deep eutectic solvents: Mechanistic understanding and future perspective
Journal Article
·
· Water Research
- Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States)
- University of Kentucky, Lexington, KY (United States)
- New Jersey Institute of Technology, Newark, NJ (United States)
- University of Maryland, College Park, MD (United States)
Volatile fatty acids (VFAs) derived from arrested anaerobic digestion (AD) can be recovered as a valuable commodity for value-added synthesis. However, separating VFAs from digestate with complex constituents and a high-water content is an energy-prohibitive process. This study developed an innovative technology to overcome this barrier by integrating deep eutectic solvents (DESs) with an omniphobic membrane into a membrane contactor for efficient extraction of anhydrous VFAs with low energy consumption. Here, a kinetic model was developed to elucidate the mechanistic differences between this novel omniphobic membrane-enabled DES extraction and the previous hydrophobic membrane-enabled NaOH extraction. Experimental results and mechanistic modeling suggested that VFA extraction by the DES is a reversible adsorption process facilitating subsequent VFA separation via anhydrous distillation. High vapor pressure of shorter-chain VFAs and low Nernst distribution coefficients of longer-chain VFAs contributed to DES-driven extraction, which could enable continuous and in-situ recovery and conversion of VFAs from AD streams.
- Research Organization:
- University of Maryland, College Park, MD (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE); United States Department of Agriculture National Institute of Food and Agriculture
- Grant/Contract Number:
- EE0009268
- OSTI ID:
- 2540062
- Alternate ID(s):
- OSTI ID: 2345275
- Journal Information:
- Water Research, Journal Name: Water Research Vol. 257; ISSN 0043-1354
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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