Photo-fenton pretreatment of carbofuran -analyses via experimental design, detoxification and biodegradability enhancement

Li An Lu, Ying Shih Mab, Mathava Kumar, Jih-Gaw Lin*

*Corresponding author for this work

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

The central composite design (CCD) and response surface methodology (RSM) were employed to evaluate the effect of H2O2 dosage rate (1-10 mg L-1 min-1) and Fe3+ dosage (1-100 mg L-1) in the photo-Fenton treatment of carbofuran and to develop the second-order polynomial equations in terms of carbofuran and dissolved organic carbon (DOC) removals and BOD5/DOC ratio with different reaction times. Both H2O2 dosage rate and Fe3+ dosage have significant effects on the dependable variables. Based on the results of carbofuran removal and BOD5/DOC ratio, H2O2 dosage rate of 5.4 mg L-1 min-1 and Fe3+ dosage of 59 mg L-1 were found to be the favorable reagent dosages for carbofuran degradation. Under these conditions, the toxicity unit measured by Microtoxandreg; test with 5 min exposure was decreased from 47 to 6 and the biodegradability evaluated by BOD5/COD ratio was increased from 0 to 0.76 after 60 min reaction. The results obtained in this study demonstrate that the photo-Fenton process is a promising pretreatment before the application of biological treatment for carbofuran removal from contaminated water/wastewater.

Original languageEnglish
Pages (from-to)325-331
Number of pages7
JournalSeparation and Purification Technology
Volume81
Issue number3
DOIs
StatePublished - 10 Oct 2011

Keywords

  • Biodegradability
  • Carbofuran
  • Central composite design
  • Microtox® test
  • Response surface methodology

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