Decolorization, mineralization and toxicity reduction of acid orange 6 by iron-sacrificed plates in the electrocoagulation process

E. E. Chang, Hao Jan Hsing, Chi Sean Ko, Pen Chi Chiang

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

In this study, electrocoagulation (EC) was used to investigate the decolorization and mineralization of an azo dye solution, as well as biodegradation enhancement and toxicity reduction. Initial pH, flow rate, and acid orange 6 concentration were investigated, and the optimum operational parameters were found to be pH = 4, flow rate (Q) = 0.3 to 0.5 L min-1, and current density = 68.3 A dm-2. With these optimal parameters, total organic carbon and color removal efficiencies of 40% and 98% were achieved, respectively. Biodegradation was evaluated using the ratio of the 5-day biological oxygen demand (BOD5) and the chemical oxygen demand (COD), which was 0.19 to 0.25 initially and increased to the range 0.25 to 0.4 after EC treatment, indicating that biodegradability was significantly enhanced. The mean effective concentration (EC50) was measured to represent the toxicity of the solution. Initial EC50 values ranged from 25 to 6.6%, which represent extremely toxic to very toxic solutions. After EC treatment, the toxicity levels were reduced significantly, suggesting that the EC process could be a promising method for reducing the toxicity of textile wastewater.

Original languageEnglish
Pages (from-to)488-495
Number of pages8
JournalJournal of Chemical Technology and Biotechnology
Volume82
Issue number5
DOIs
Publication statusPublished - May 2007

Fingerprint

Electrocoagulation
Toxicity
Iron
mineralization
toxicity
Biological Oxygen Demand Analysis
iron
Acids
Poisons
acid
Biodegradation
biodegradation
Azo Compounds
Flow rate
Azo dyes
Textiles
Biodegradability
Chemical oxygen demand
biochemical oxygen demand
Waste Water

Keywords

  • Azo dye
  • Biodegradation
  • Decolorization
  • Electrocoagulation
  • Toxicity reduction

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Biotechnology
  • Bioengineering

Cite this

Decolorization, mineralization and toxicity reduction of acid orange 6 by iron-sacrificed plates in the electrocoagulation process. / Chang, E. E.; Hsing, Hao Jan; Ko, Chi Sean; Chiang, Pen Chi.

In: Journal of Chemical Technology and Biotechnology, Vol. 82, No. 5, 05.2007, p. 488-495.

Research output: Contribution to journalArticle

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