Abstract
The efficiency of TiO2 photocatalysis induced by ultraviolet and visible irradiation and salt-free
 electrolysis over boron-doped diamond electrodes to inactivate total (TC) and fecal (FC)
 coliforms in secondary treated municipal wastewater was evaluated. Photocatalytic
 experiments were conducted with two types of titania (Degussa P25 and sulfur-doped
 catalyst) at loadings in the range 0.1-0.5 g l-1 and three types of irradiation, i.e. artificial UV-A,
 artificial visible and solar. Electrolysis was conducted in a flow-through cell at anodic current
 densities of 14.3 and 28.6 mA cm-2 without the addition of auxiliary chemicals. Inactivation
 followed a first-order kinetic expression with regard to bacteria population and the rate was
 dependent of the experimental conditions in question. In general, electrochemical disinfection
 was up to about two orders of magnitude faster than photocatalysis; for instance, TC
 population decreased to less than 5% of the initial population after 9 and 4 min at 14.3 mA
 cm-2 and 28.6 mA cm-2 respectively. Similar efficiencies with TiO2 photocatalysis would
 require at least 30 min of contact time. Interestingly, energy consumption for the
 electrochemical process was computed to about 0.5 kWh per m3 of treated effluent, well
 below the respective value for photocatalysis.
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