Treatment of high strength hexamine-containing wastewater by Electro-Fenton method

Shanshan Chou*, Yao Hui Huang, Shen Nan Lee, Gaw Hao Huang, Ch-Hpin Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

143 Scopus citations

Abstract

A novel Electro-Fenton (EF-Fere) method, applied H2O2 and electrogenerated ferrous ion, was investigated for treating the hexamine-containing wastewater. The performance of Fe2+ generation in the electrolytic system was first evaluated, including the factors of the cathode material, initial pH, initial ferric concentration (Fe(i)), and current density. When initial pH exceeded 2.5, the current efficiency dramatically decreased, which was due to the formation of Fe(OH)3. Between 3000 and 10,000 mg/l of Fe(i), the initial current efficiency of Fe2+ generation was almost constant (85-87%), which dropped sharply to 39% at 1000 mg/l. In EF-Fere experiments, the COD removal efficiency attained above 94% after 5 h of reaction. The relationship between the temperature, dissolved oxygen, and COD was discussed. The changes in hexamine and its oxidation intermediates (methanol, formaldahyde, formate, ammonium and nitrate) during the reaction were also investigated. Three additional experiments using H2O2/Fe2+, H2O2/Fe3+, and direct electrolysis were also conducted to treat the hexamine-containing wastewater for comparison. The results showed that the EF-Fere method was the most efficient.

Original languageEnglish
Pages (from-to)751-759
Number of pages9
JournalWater Research
Volume33
Issue number3
DOIs
StatePublished - 1 Feb 1999

Keywords

  • Electrolysis
  • Hexamine
  • Hydrogen peroxide
  • Oxidation
  • Wastewater

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