African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12487

Full Length Research Paper

Effects of Cr3+ and Ni2+ on the efficiency and performance of sequencing batch reactor (SBR) system

Methinee Rarunroeng
  • Methinee Rarunroeng
  • Department of Environmental Technology, School of Energy Environment and Materials, King Mongkut’s University of Technology Thonburi, Thungkru, Bangmod, Bangkok 10140, Thailand.
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Suntud Sirianuntapiboon
  • Suntud Sirianuntapiboon
  • Department of Environmental Technology, School of Energy Environment and Materials, King Mongkut’s University of Technology Thonburi, Thungkru, Bangmod, Bangkok 10140, Thailand.
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  •  Accepted: 30 January 2012
  •  Published: 15 March 2012

Abstract

 

Sequencing batch reactor (SBR) system at hydraulic retention time (HRT) of 1.5 days could be used for the treatment of Ladkrabang industrial estate wastewater (LIWW) with high Cr3+ and Ni2+ removal efficiencies of 80.7 ± 17.9 and 53.5 ± 25.1%, respectively. Bio-sludge of SBR system with synthetic industrial estate wastewater (SIWW) showed the highest Cr3+ and Ni2+ adsorption yields of 36.00 ± 9.80 and 31.59 ± 9.67 mg/g, respectively but they were reduced to 25.20 ± 8.38 and 20.49 ± 7.20 mg/g, respectively with LIWW. Cr3+ and Ni2+ strongly suppressed the growth and activity of heterotrophic bacteria. Ni2+ at 3.0 mg/L did not impact either nitrifying or denitrifying bacteria, while the growth and activity of denitrifying bacteria was suppressed at 3.0 mg/L Cr3+. The other advantage of SBR system was that the bio-sludge could adsorb inorganic matters from LIWWs, which contains high inorganic content about 33%.

 

Key words: Adsorption, chromium, heavy metals, nickel, sequencing batch reactor (SBR) system.

Abbreviation

SBR, Sequencing batch reactor; HRT, hydraulic retention time;LIWW, Ladkrabang industrial estate wastewater; SIWW, synthetic industrial estate wastewater.

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This article is published under the terms of the Creative Commons Attribution License 4.0

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