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Anhydrous volatile fatty acid extraction through omniphobic membranes by hydrophobic deep eutectic solvents: Mechanistic understanding and future perspective

Journal Article · · Water Research
 [1];  [1];  [2];  [3];  [4];  [2];  [3];  [1]
  1. Virginia Polytechnic Institute and State University (Virginia Tech), Blacksburg, VA (United States)
  2. University of Kentucky, Lexington, KY (United States)
  3. New Jersey Institute of Technology, Newark, NJ (United States)
  4. 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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