Integrated acidogenic digestion and carboxylic acid separation by nanofiltration membranes for the lignocellulosic carboxylate platform

Boya Xiong, Tom L. Richard, Manish Kumar

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

The major goal of this work was to evaluate the ability of two commercially available nanofiltration membranes (NF) to efficiently separate a mixture of carboxylic acids while simultaneously retaining sugars in actual lignocellulosic biomass digestion liquor. The process achieved separation by high sugar rejection (>90%) and low acid rejection (0-40%), with the exception of butyric acid (100% rejection). Lower pH led to a significantly lower acetic and lactic acid rejection. The recovery of acids was further enhanced by operating at low pressure. Salt addition did not have a strong influence on acid and sugar rejection. Integrating separation with digestion recovered 86% of the acid during a 21 day digestion run, reducing acid concentration in the digestate by nearly 90% relative to a control without acid removal. These results demonstrate proof of concept for use of NF based anaerobic membrane bioreactors to recover carboxylic acids produced from the lignocellulosic carboxylate platform.

Original languageEnglish (US)
Pages (from-to)275-283
Number of pages9
JournalJournal of Membrane Science
Volume489
DOIs
StatePublished - Sep 1 2015

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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