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

研究成果: 雜誌貢獻文章同行評審

10 引文 斯高帕斯(Scopus)

摘要

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.
原文英語
頁(從 - 到)488-495
頁數8
期刊Journal of Chemical Technology and Biotechnology
82
發行號5
DOIs
出版狀態已發佈 - 5月 2007

ASJC Scopus subject areas

  • 化學 (全部)
  • 化學工程 (全部)
  • 生物技術
  • 生物工程

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