Advanced treatment of hydrothermal liquefaction wastewater with nanofiltration to recover carboxylic acids

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Abstract

This study aimed to evaluate the innovative application of nanofiltration technology for the concentration and recovery of carboxylic acids from HTL wastewater. Four synthetic HTL wastewater solutions were processed by nanofiltration under both acidic (initial pH of ∼2.6) and alkaline (pH 8-10) environments. At alkaline pH, the permeate flux was much lower. A high DOC rejection of 82.5% was observed at pH 8 compared to a low DOC rejection of 17.3% at the initial pH of ∼2.6. Isobutyric acid was rejected to a higher degree relative to other carboxylic acids, exhibiting up to 95% rejection at pH 8. Phenol, butanone, and pyridine exhibited low rejection under the alkaline environment indicating that they can be separated from carboxylic acids. Nanofiltration technology presents a potential pathway to both concentrate and subsequently recover carboxylic acids from HTL wastewater.

Original languageEnglish (US)
Pages (from-to)520-528
Number of pages9
JournalEnvironmental Science: Water Research and Technology
Volume4
Issue number4
DOIs
StatePublished - Apr 2018

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Nanofiltration
Liquefaction
carboxylic acid
Carboxylic acids
liquefaction
Wastewater
wastewater
alkaline environment
Pyridine
Phenols
phenol
Fluxes
Recovery
Acids
acid

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

Cite this

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abstract = "This study aimed to evaluate the innovative application of nanofiltration technology for the concentration and recovery of carboxylic acids from HTL wastewater. Four synthetic HTL wastewater solutions were processed by nanofiltration under both acidic (initial pH of ∼2.6) and alkaline (pH 8-10) environments. At alkaline pH, the permeate flux was much lower. A high DOC rejection of 82.5{\%} was observed at pH 8 compared to a low DOC rejection of 17.3{\%} at the initial pH of ∼2.6. Isobutyric acid was rejected to a higher degree relative to other carboxylic acids, exhibiting up to 95{\%} rejection at pH 8. Phenol, butanone, and pyridine exhibited low rejection under the alkaline environment indicating that they can be separated from carboxylic acids. Nanofiltration technology presents a potential pathway to both concentrate and subsequently recover carboxylic acids from HTL wastewater.",
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