Figures index

From

Treatment of Municipal Waste Water by Photocatalytic Method

Assefa Alena, Omprakash Sahu

International Journal of Environmental Bioremediation & Biodegradation. 2013, 1(2), 49-53 doi:10.12691/ijebb-1-2-3
  • Figure 1. Schematic representation of the formation of the redox active electron – hole pairs at the surface of TiO2. Subsequently, electrons and positively charged holes react with redox active species in the solution to form very reactive radicals
  • Figure 2. The laboratory-made reactor for TiO2 / UV-A disinfection of natural water and wastewater
  • 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).
  • Figure 4. Bactericidal activity (expressed as CFU/mL) of 0.5 g/L (■), and 1 g/L (●) Degussa P25 TiO2 for total coliforms (A) and for enterococci (B) after TiO2 / UV-A treatment.
  • Figure 5. pH effects on the survival of total coliforms (A) and of Enterococci (B). 1 g/L of Degussa P25 TiO2 was used.