Thermophillic treatment by anaerobic granular sludge as an effective approach to accelerate the electron transfer and improve the reductive decolorization of azo dyes in bioreactors

A.B. dos Santos, J. Traverse, F.J. Cervantes, J.B. van Lier

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)

Abstract

The effects of temperature, hydraulic retention time (HRT), and the redox mediator, thraquinone- 2,6-disulfonate (AQDS), on electron transfer and subsequent reductive decolorization of dyes rom textile wastewater was assessed in mesophilic and thermophilic anaerobic bioreactors. The results clearly show that compared to mesophilic anaerobic treatment, thermophilic treatment at 55 8C is an effective approach for increasing the electron transfer capacity in bioreactors, and thus improving the decolorization rates. At an HRT of 2.5 h and in the absence of AQDS, the color removal was 5.3-fold higher at 55 8C compared to 30 8C. Furthermore, similar decolorizations were found at 55 8C between the AQDS-free and AQDSsupplemented reactors, whereas a significant difference (up to 3.6-fold) on dye reduction occurred at 30 8C. Keywords Azo dye; color removal; electron transfer; anaerobic treatment; mesophilic; thermophilic
Original languageEnglish
Pages (from-to)363-369
JournalWater Science and Technology
Volume52
Issue number1-2
DOIs
Publication statusPublished - 2005

Keywords

  • decolorization
  • temperature
  • textile industry
  • dyes
  • azo compounds
  • waste water treatment
  • anaerobic treatment
  • sludges
  • redox mediators
  • reactor
  • transformation
  • aqds

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