Electrochemical oxidation of sulphides in paper mill wastewater by using mixed oxide anodes

Heikki Särkkä, Kaisa Kuhmonen, Mikko Vepsaläinen, Martti Pulliainen, Jukka Selin, Pekka Rantala, Esko Kukkamäki, Mika Sillanpää

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

In this study, the electrochemical oxidation technique was used to oxidize sulphides present in paper mill wastewater. Inactivation of anaerobic bacteria in wastewater was also investigated. Sulphide oxidation was effective during the experiments, and the best efficiency was achieved by the smallest current density used. One of the main oxidants of sulphides during the experiments was oxygen. Anaerobic bacteria were better inactivated with higher initial chloride concentration in wastewater because of electrochemically generated chlorine/hypochlorite. Dissolved oxygen, redox potential and pH values of the wastewater increased because of electrochemically generated oxygen-based oxidants and oxidation reactions occurring on the anode. In general, it can be said that sulphide removal was successful in the present study.

Original languageEnglish
Pages (from-to)885-892
Number of pages8
JournalEnvironmental Technology (United Kingdom)
Volume30
Issue number9
DOIs
Publication statusPublished - Aug 2009
Externally publishedYes

Keywords

  • Electrochemical oxidation
  • Mixed oxide anodes
  • Oxygen evolution
  • Paper mill wastewater
  • Sulphide

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology
  • Waste Management and Disposal

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