Technologies for recovery of energy from wastewaters: Applicability and potential in South Africa

Authors

  • William Stafford University of Cape Town
  • Brett Cohen
  • Simisha Pather-Elias
  • Harro von Blottnitz
  • Robert van Hille
  • Sue T.L. Harrison
  • Stephanie G. Burton

DOI:

https://doi.org/10.17159/2413-3051/2013/v24i1a3003

Abstract

This study explored technologies for recovering energy from wastewater through production of biomass, combustion and gasification, generation of biogas, production of bioethanol, heat recovery and microbial fuel cells. A first order desktop analysis of the potential for applying these solutions to wastewaters in South Africa revealed that 3 200 to 9 000 MWth of energy has potential for recovery, equating to at most 7% of South Africa’s current electrical power supply. Formal and informal animal husbandry, fruit and beverage industries and domestic blackwater were identified as wastewaters with the greatest potential for energy recovery. Of the reviewed technologies, anaerobic digestion shows applicability to the widest range of feedstocks. Net energy generated, reduction in pollution, and water reclamation are identified as the main benefits, but additional benefits such as certified emission reductions, fertiliser production and the production of secondary products may dictate the economic feasibility.

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Author Biography

  • William Stafford, University of Cape Town
    Energy Research Centre Snr Research Officer

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Published

2013-02-01

How to Cite

Technologies for recovery of energy from wastewaters: Applicability and potential in South Africa. (2013). Journal of Energy in Southern Africa, 24(1), 15-26. https://doi.org/10.17159/2413-3051/2013/v24i1a3003