African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12479

Full Length Research Paper

Treatment of domestic wastewater by anaerobic denitrification: Influence of the type of support media on the production of extracellular polymer substances

Salama Youssef*
  • Salama Youssef*
  • Laboratory of Marine Biotechnology and Environment (BIOMARE), Faculty of Science, University of Chouaib Doukkali, BP 20, 24000, Morocco; Laboratory of Water and Environment, Faculty of Science, University of Chouaib Doukkali, BP 20, 24000 El Jadida, Morocco.
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Chennaoui Mohammed
  • Chennaoui Mohammed
  • Laboratory of Marine Biotechnology and Environment (BIOMARE), Faculty of Science, University of Chouaib Doukkali, BP 20, 24000, Morocco; Regional Centres for the Professions of Education and Training (CRMEF), El Jadida, Morocco.El Jadida, Morocco.
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Sylla Aboubakr
  • Sylla Aboubakr
  • Laboratory of Marine Biotechnology and Environment (BIOMARE), Faculty of Science, University of Chouaib Doukkali, BP 20, 24000, Morocco.
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Mountadar Mohammed
  • Mountadar Mohammed
  • Laboratory of Water and Environment, Faculty of Science, University of Chouaib Doukkali, BP 20, 24000 El Jadida, Morocco.
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Rihani Mohammed
  • Rihani Mohammed
  • Laboratory of Marine Biotechnology and Environment (BIOMARE), Faculty of Science, University of Chouaib Doukkali, BP 20, 24000, Morocco.
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Assobhei Omar
  • Assobhei Omar
  • Laboratory of Marine Biotechnology and Environment (BIOMARE), Faculty of Science, University of Chouaib Doukkali, BP 20, 24000, Morocco.
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  •  Received: 15 December 2014
  •  Accepted: 29 December 2015
  •  Published: 27 January 2016

Abstract

Eighteen Erlenmeyer flask containing six different support media [pozzolan, polyvinyl chloride1 (PVC1), polyvinyl chloride2 (PVC2), foam, polyethylene terephthalate (PET) and polystyrene (PS)] were subject to identical volumetric organic loadings and hydraulic retention time in treating synthetic protein ± carbohydrate waste. The objective was to examine the influence of support media on performance of anaerobic denitrification and retention and their resulting impact on system performance and failure. According to the results relative to every control support media, it was noticed that the best support media were the ones in PVC1 and PVC2, with successive reduction rates of 68.33 and 61.93% for chemical oxygen demand (COD), and 55 and 49% for nitrate. On the other hand, in two submerged anaerobic biofilter reactor packed with the support media of PVC1 and PVC2, the reactor with PVC1 media exhibited 89.93% COD and 78.75% nitrate removal efficiency attributable to its higher production of EPSp and EPSc.

Key words: Wastewater, anaerobic biofilm, extracellular polymeric substances (EPS), extraction, support media.

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

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