Removal of nonsteroidal anti-inflammatory drugs (NSAIDs) by electrocoagulation-flotation with a cationic surfactant

Yu Jung Liu, Shang Lien Lo, Ya Hsuan Liou, Ching-Yao Hu

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

An electrocoagulation flotation (ECF) process was used to remove selected nonsteroidal anti-inflammatory drugs (NSAIDs), specifically diclofenac, ibuprofen, and ketoprofen, from water. A cationic surfactant, cethyltrimethyl ammonium bromide (CTAB), was added to the solution as a collector and frother. Without the addition of the cationic surfactant, the removal of NSAIDs in a single-NSAID solution was in the range of 10-45%; it decreased to approximately 10% in multiple-NSAID systems. However, after adding a stoichiometric amount of CTAB, the removal of NSAIDs significantly improved in single-NSAID systems. For multiple-NSAID removal, the concentration of CTAB required to achieve ideal removal was equal to the sum of the molar concentrations of all the NSAIDs. In addition, a high current density produced smaller bubbles, thus enhanced the electro-flotation and achieved better removal performance. Removal of multiple-NSAIDs in actual hospital wastewater was significantly lower due to interference by oils and other hydrophobic substances.

Original languageEnglish
Pages (from-to)148-154
Number of pages7
JournalSeparation and Purification Technology
Volume152
DOIs
Publication statusPublished - Aug 24 2015

Keywords

  • Aluminum electrodes
  • Cationic surfactant
  • Electrocoagulation-flotation
  • Hospital wastewater
  • Nonsteroidal anti-inflammatory drugs (NSAIDs)

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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