Reduction Of Escherichia Coli Using Ceramic Disk Filter Decorated By Nano-TiO₂

The present study investigated the reduction of Escherichia coli(E.coli)using ceramic disk filters(CDFs)decorated by nano-TiO2.The production of CDFs coated with nano-TiO2 in terms of rice-husk ratio,rice-husk particle size,heating hold time and nano-TiO2 mass fraction was optimized.The results show that the optimum conditions for CDFs with nano-TiO2 coating included rice-husk ratio of 29.03%,rice-husk particle size of 0.28 mm,heading hold time of 1.41 h and nano-TiO2 mass fraction of 2.21%.Additionally,the antibacterial mechanism of ceramic disk filters(CDFs)decorated by nano-TiO2 was studied.The combination of physical and chemical sterilization was the main reason.The structure,crystal type,elemental composition and porosity of the ceramic disk filters(CDFs)decorated by nano-TiO2 were further studied to further verify the mechanism.The effects of temperature,influent E.coli concentration and lamp power and their interactions were explored via factorial analysis.E.coli concentration and lamp power had significant effects on E.coli removal efficiency.This study provided the solid theoretical support for understanding the production and bacteria inactivation relevant to CDFs impregnated with nano-TiO2.The results have important implications for finding a safe and cost-effective approach to solve drinking water problems in developing countries.