Work

Disinfection of municipal wastewater by TiO2 photocatalysis with UV-A, visible and solar irradiation and BDD electrolysis

Year: 2013

Type: article

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.

Source: Global NEST Journal

DOI: 10.30955/gnj.000604

Authors: M. Melemeni, D. Stamatakis, Nikolaos P. Xekoukoulotakis, Dionissios Mantzavinos, Nicolas Kalogerakis

Institution: Technical University of Crete

Language: English

Topic: Advanced oxidation water treatment

Subfield: Water Science and Technology

Field: Environmental Science

Domain: Physical Sciences

SDGs: Clean water and sanitation, Affordable and clean energy

Open Access status: bronze

Funder: European Social Fund