Combined electrocoagulation and chemical coagulation of paper mill mechanically cleaned water

M. Vepsäläinen, J. Selin, M. Pulliainen, M. Sillanpää

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

This paper presents a study on the removal of natural organic matter (NOM) from paper mill mechanically treated water by integrating electrocoagulation (EC) with chemical coagulation (CC). The EC cell was made from monopolar aluminum plates and samples were pipetted, filtered or floated after CC and EC. It was found that the combination method was efficient in removing NOM even with small electric charges per litre. Colour and permanganate removals of 91 and 88%, respectively, were achieved by the combination of coagulation methods and dissolved air flotation treatment. Permanganate removal in the combination treatment exceeded pure CC. Residual aluminum levels were below 0.05 mg/L in filtered samples. EC also raised the pH and lowered the conductivities of the samples. The best current efficiency for removal ofNOMfrom water was achieved with the smallest current density and the highest removal rate with the highest current density.

Original languageEnglish
Pages (from-to)233-239
Number of pages7
JournalJournal of Pulp and Paper Science
Volume33
Issue number4
Publication statusPublished - Oct 2007
Externally publishedYes

Keywords

  • Coagulation
  • Electricity
  • Water reclamation
  • Water treatment

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • General Materials Science
  • Media Technology

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