NFe0/GAC-mediated advanced catalytic per-oxidation for pharmaceutical wastewater treatment

Vijayalakshmi Gosu, Bhola Ram Gurjar, Rao Y. Surampalli, Tian C. Zhang

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

In the present study, the treatment of pharmaceutical wastewater (PWW) in terms of organic content (COD, TOC) has been investigated using advanced catalytic per-oxidation (ACPO) with granular activated carbon supported nano zero valent iron (nFe0/GAC). The characteristics of PWW and optimization of reaction parameters that influence the process efficiency have also been evaluated. The PWW contains a high amount of organic content of non-biodegradable nature. At optimum conditions, ∼81% COD and ∼76% TOC removal was attained. Moreover, ACPO process was more favorable to the complete oxidation. The reaction kinetics follows the two-step pseudo first-order model. The activation energy (E) for the first and second steps was calculated as ∼22 and ∼23 kJ/mol, respectively. The two-step kinetics can be attributed primarily to the oxidation of organic compound first to short chain molecular structures (organic acids) followed by their complete oxidation to produce carbon dioxide and water. Moreover, the average oxidation state (AOS) got raised from -1.8 to 2.1, which represents the strong mineralization and the generation of highly oxidized intermediates. Thus, the treatment of PWW using nFe0/GAC + H2O2 could be considered to be an effective alternative treatment option.

Original languageEnglish (US)
Pages (from-to)1996-2004
Number of pages9
JournalJournal of Environmental Chemical Engineering
Volume2
Issue number4
DOIs
Publication statusPublished - Dec 2014

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Keywords

  • Advance Fenton's reagent (nFe/GAC + HO)
  • Advanced catalytic per-oxidation
  • Kinetic study
  • Pharmaceutical wastewater
  • Wastewater treatment

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Pollution
  • Process Chemistry and Technology

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