Biodegradability enhancement of wastewater containing cefalexin by means of the electro-Fenton oxidation process

Adriana Ledezma Estrada, Gyokuyu Ri, Aimin Wang

Research output: Contribution to journalArticlepeer-review

106 Citations (Scopus)

Abstract

The comparative degradation behavior of cefalexin (CLX) using advanced oxidation processes (AOPs) with the aim of improving CLX biodegradability was studied. Among the AOPs used, RuO 2/Ti anodic oxidation (AO), AO in the presence of electro-generated H 2O 2 (AO-H 2O 2), and the electro-Fenton (EF) process, the EF process was the most effective. In the EF process an activated carbon fiber (ACF) was used as a cathode. Different input variables, including catalyst concentration, pH, and current density were evaluated to find the optimum conditions for the EF. The most suitable operational conditions were as follows: a current density of 6.66mA/cm 2, a pH of 3, and a concentration of 1mM of Fe 2+ as the catalyst. Different CLX concentrations were analyzed as well of different reaction times to assess the degree of mineralization. The change in biodegradability was evaluated by the BOD 5/COD and the BOD 14/COD ratios. The EF did not effectively remove the COD, but removed enough to achieve suitable biodegradability for a further biological process.

Original languageEnglish
Pages (from-to)41-48
Number of pages8
JournalJournal of Hazardous Materials
Volume227-228
DOIs
Publication statusPublished - 2012 Aug 15

Keywords

  • Advanced oxidation processes (AOPs)
  • Biodegradability enhancement
  • Cefalexin
  • Electro-Fenton process

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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