African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12209

Full Length Research Paper

Study of oxygen transfer processes improvement for domestic wastewaters treatment

Stenelvie Dajeavine NGALA
  • Stenelvie Dajeavine NGALA
  • Water Treatment and Climate Change, Environment Engineering Laboratory, Hassania School of Public Works, Km 7, El Jadida Road, B.P 8108, Oasis, Casablanca, Morocco.
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Ahmed SALIM
  • Ahmed SALIM
  • Laboratory of Organic Synthesis, Extraction and Valorization, Faculty of Sciences Ain Chock, University Hassan-II, Km 8 El Jadida Road, B.P 5366 Maarif Casablanca 20100, Morocco.
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Sarah JERROUMI
  • Sarah JERROUMI
  • Higher National School of Electricity and Mechanics, University Hassan-II, El Jadida Road, B.P 8108, Oasis, Casablanca, Morocco.
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Brahim LEKHLIF
  • Brahim LEKHLIF
  • Water Treatment and Climate Change, Environment Engineering Laboratory, Hassania School of Public Works, Km 7, El Jadida Road, B.P 8108, Oasis, Casablanca, Morocco.
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El Hassan MALIL
  • El Hassan MALIL
  • Water Treatment and Climate Change, Environment Engineering Laboratory, Hassania School of Public Works, Km 7, El Jadida Road, B.P 8108, Oasis, Casablanca, Morocco.
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  •  Received: 14 September 2018
  •  Accepted: 25 February 2019
  •  Published: 20 March 2019

Abstract

In aerated processes, the oxygen transfer was limited by the presence of the suspended matter as colloid and the dissolved matter, which might decrease the biological degradation effectiveness. In this publication, three series of tests were conducted to study possibilities to reduce these matters: bacterial adaptation which was conducted in a biological aerated filter, adsorption/biosorption conducted on a biological aerated filter with a biofilm of adapted bacteria and percolation in a bioreactor with a packed plastic media. All the tests carried out gave convincing results concerning turbidity and chemical oxygen demand, as parameters limiting the oxygen transfer for a better biodegradation. The advanced adaptation improved their elimination. So, all these treatment techniques could be used as pretreatment processes; in addition, they required very little energy, particularly adsorption/biosorption and percolation.

Key words: Pretreatment, purification, biological aerated filter, adsorption, biosorption, percolation, packed plastic media.