PHOTOCATALYTIC PURIFICATION OF DRINKING WATER
Report No: 834/1/00
Background and Motivation of Project
Raw surface and groundwater can contain a wide range of materials that are detrimental to human health. These material can be classified as:
The traditional flocculation/coagulation process has proved not to be completely efficient in removing all the combinations of material that can occur in raw water. These combinations can vary on an hourly basis, which complicates the flocculation/coagulation procedure even further.
Various other processes are under investigation elsewhere e.g. ozonation, treatment by hydrogen peroxide, ultraviolet irradiation treatment, microfiltration, Ti02 photocatalysis etc. Some of these techniques have found application especially in urban areas. Application of these techniques in isolated rural communities however, poses a serious problem. This WRC sponsored project was undertaken to assess the effectiveness of Ti02 photocatalysis for the oxidative removal of some of the above mentioned groups of compounds( 1, 4 and 5 ) from raw water. The project comprised two phases: an initial screening phase (August 1995 to December 1997) and a follow-up phase (January 1998 to June 2000). Experimental research was jointly conducted by the Department of Chemistry (University of Stellenbosch) and the Programme on Mycotoxins and Experimental Carcinogenesis (PROMEC) at the Medical Research Council (based in Tygerberg).
The objectives of this research programme were to:
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