African Journal of
Microbiology Research

  • Abbreviation: Afr. J. Microbiol. Res.
  • Language: English
  • ISSN: 1996-0808
  • DOI: 10.5897/AJMR
  • Start Year: 2007
  • Published Articles: 5249

Full Length Research Paper

Optimisation of biological wastewater treatment for yeast processing effluent using cultured bacteria: Application of response surface methodology

Manhokwe S.
  • Manhokwe S.
  • Department of Food Science and Nutrition, Midlands State University, P. Bag 9055, Gweru, Zimbabwe.
  • Search for this author on:
  • Google Scholar
Shoko S.
  • Shoko S.
  • Department of Applied Biosciences and Biotechnology, Midlands State University, P. Bag 9055, Gweru, Zimbabwe.
  • Search for this author on:
  • Google Scholar
Zvidzai C.
  • Zvidzai C.
  • Department of Biotechnology, Chinhoyi University of Technology, P. Bag 7724, Chinhoyi, Zimbabwe.
  • Search for this author on:
  • Google Scholar


  •  Received: 05 July 2019
  •  Accepted: 14 August 2019
  •  Published: 31 August 2019

Abstract

In the present study, the interactive effects of temperature and cultured bacteria on the performance of a biological treatment system of wastewater from a local yeast producing plant were investigated. The main objective of this study was to optimize the operating parameters that reduce organic load and colour. Biological treatment was conducted using a Central Composite Design (CCD) and optimised using Response Surface Methodology (RSM) on Design Expert 7 software. Two dependent variables namely, Chemical Oxygen Demand (COD) removal and colour reduction were studied. COD removal efficiency of 26% and decolourization efficiency of 44% were recorded for the wastewater treatment. The optimised conditions for the biological treatment were found to be at 16.37 g/l of bacterial powder at 25°C for COD removal and colour reduction. The optimised parameters can be used for biological treatment of yeast plant effluent for removal of organic load and colour.

 

Key words: Cultured bacteria, wastewater, treatment, response surface methodology

Copyright © 2025 Author(s) retain the copyright of this article.

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

Back to Vol. 13 No. 26
Back to articles
SUBSCRIBE TO RSS
SUBMIT MANUSCRIPT
CONFERENCES