Removal of glyphosate in neutralization liquor from the glycine-dimethylphosphit process by nanofiltration

Ming Xie, Zhiying Liu, Yanhua Xu

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Nanofiltration (NF) was investigated for the removal of glyphosate in the neutralization liquor produced by the glycine-dimethylphosphit process. The Desal-5 DK membrane was chosen as the most suitable membrane for the NF process when compared to the DL and NTR7450 membranes according to retention of glyphosate and the permeate flux. The effects of applied pressure, temperature, and feed pH on the performances of the DK membrane were investigated. An applied pressure of 2MPa was found to be optimum since a high glyphosate rejection of 95.5% was obtained with a high flux of 7.32L/(hm2); temperature had a slight impact on the retention of glyphosate with an increase in flux; both the minimum glyphosate retention and maximum permeate flux were achieved when the feed pH was around the isoelectric point of the DK membrane. In batch NF, the permeate flux decreased gradually but glyphosate rejection remained higher than 90%. After 8h of NF, glyphosate recovery from the neutralization liquor reached 89.6% with an average permeate flux of around 4L/(hm2). Moreover, membrane surface crystallization induced by concentration polarization probably caused the flux to decline during the process of batch NF.

Original languageEnglish
Pages (from-to)975-980
Number of pages6
JournalJournal of Hazardous Materials
Volume181
Issue number1-3
Early online date1 Jun 2010
DOIs
Publication statusPublished - 15 Sep 2010

Keywords

  • Glycine-dimethylphosphit process
  • Glyphosate
  • Nanofiltration

ASJC Scopus subject areas

  • Health, Toxicology and Mutagenesis
  • Pollution
  • Waste Management and Disposal
  • Environmental Chemistry
  • Environmental Engineering
  • Medicine(all)

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