Figure 3. Bactericidal activity of Degussa P25, Trolox HP₂ and Millennium PC₅₀₀ TiO₂ catalysts. Natural water from Kalamionas spring (A, and B) and secondary treated municipal wastewater (C and D) were irradiated by UV-A light, in the presence of the catalysts, for 0, 15, 30, 45 and 60 min. The survival of total coliforms (A and C) and enterococci (B and D) is expressed as colony forming units per mL of treated sample (CFU/mL).

From

Treatment of Municipal Waste Water by Photocatalytic Method

Assefa Alena, Omprakash Sahu

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