Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6588034 | Chemical Engineering Journal | 2013 | 8 Pages |
Abstract
In this work, the electrochemical disinfection with conductive diamond electrodes was studied to treat simulated ballast water. Artemia salina was used as indicator organism and Escherichia coli as indicator bacterium. The influence of salinity (3 and 30Â g/L NaCl simulating brackish and ballast water, respectively), current density (up to 1273Â A/m2) and operation mode (batch and single-pass) on inactivation and total residual chlorine production rates was investigated. An increase in salinity and current density generally had a beneficial effect on both rates. A. salina in ballast water was completely inactivated after 45Â min of batch treatment at 255Â A/m2 (corresponding to about 200Â mg/L of produced chlorine) and this increased to 60Â min in brackish water. A. salina, whose inactivation follows first order kinetics, was found to be more resistant to electrochemical disinfection than E. coli. The complete inactivation of E. coli was achieved in less than 5Â min of batch operation at 127Â A/m2, whereas the concentration of produced chlorine was less than 20Â mg/L. Operation in single-pass mode was less effective for A. salina because it did not suffer mechanical stress, whereas E. coli inactivation occurred at low current densities and irrespective of the salinity due to both direct oxidation on the surface of conductive diamond anode and chemical reactions with chlorine species and/or reactive oxygen species.
Keywords
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Engracia Lacasa, Efi Tsolaki, Zouboulia Sbokou, Manuel Andrés Rodrigo, Dionissios Mantzavinos, Evan Diamadopoulos,