title: UV/TiO2 photocatalytic disinfection of carbon-bacteria complexes in activated carbon-filtered water: Laboratory and pilot-scale investigation.
abstract: The occurrence of carbon-bacteria complexes in activated carbon filtered water has posed a public health problem regarding the biological safety of drinking water. The application of combined process of ultraviolet radiation and nanostructure titanium dioxide (UV/TiO2) photocatalysis for the disinfection of carbon-bacteria complexes were assessed in this study. Results showed that a 1.07 Lg disinfection rate can be achieved using a UV dose of 20 mJ cm(-2), while the optimal UV intensity was 0.01 mW cm(-2). Particle sizes ≥8 μm decreased the disinfection efficiency, whereas variation in particle number in activated carbon-filtered water did not significantly affect the disinfection efficiency. Photoreactivation ratio was reduced from 12.07% to 1.69% when the UV dose was increased from 5 mJ cm(-2) to 20 mJ cm(-2). Laboratory and on-site pilot-scale experiments have demonstrated that UV/TiO2 photocatalytic disinfection technology is capable of controlling the risk posed by carbon-bacteria complexes and securing drinking water safety.
authors: a College of Environment, Nanjing Tech University , Nanjing , P.R. China.
authors: Jin Hui
authors: JH
authors: Zhao
authors: Wei
authors: W
authors: Chen
authors: Yaqian
authors: Y
authors: Zhao
authors: Cuiyun
authors: C
authors: Liu
authors: Ranbin
authors: R
authors: Liu
mesh_terms: D001419:Bacteria / Q000737:chemistry / Q000302:isolation & purification*; D002244:Carbon / Q000737:chemistry / Q000302:isolation & purification*; D002384:Catalysis / Q000528:radiation effects; D002606:Charcoal / Q000737:chemistry / Q000302:isolation & purification*; D004203:Disinfection / Q000295:instrumentation / Q000379:methods*; D005374:Filtration / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D008027:Light; D055668:Photochemical Processes; D010865:Pilot Projects; D014025:Titanium / Q000737:chemistry / Q000494:pharmacology*; D014466:Ultraviolet Rays; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
chemical_list: C009495:titanium dioxide; D002606:Charcoal; D002244:Carbon; D014025:Titanium
keywords: Carbon-bacteria complexes; UV dose; UV/TiO2-photocatalysis; disinfection; drinking water