n Water&Sanitation Africa - Sustaining the localisation of ozone technology for water treatment in Africa : technology

Volume 4 Number 6
  • ISSN : 1990-8857


Having witnessed an acceleration of water quality-related threats and incidents across South Africa over the last number of years, and particularly so for finite water resources, the need for considering alternative treatment technologies is on the increase. This follows global trends for water treatment goals for organic micro pollutants, disinfection by-products (DBP) and microbial inactivation (1) specifically requiring new disinfection and oxidation technologies. Conventional methods also fall short as far as disinfection against the resistant parasite cysts of giardia and cryptosporidium are concerned. Whereas coagulation and filtration will remove the cysts to some extent, it is known that chlorination (also chlorine derivatives), requires unrealistically high dose and exposure time to maintain the contact time (Ct) value where significant deactivation occurs. Conventional chemical treatment such as chlorination is furthermore expected to become less effective in future against bacterial species as certain bacteria are gradually developing resistance to halogen-based disinfectants.

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