Electrochemical disinfection of simulated ballast water on conductive diamond electrodes

Electrochemical disinfection of simulated ballast water on conductive diamond electrodes

•Ballast water treatment deals with invasive species elimination.•Electrochemical disinfection is an easy to apply process on-board.•Modeling of chlorine generation during electrochemical disinfection was performed.•Both bacteria (E. coli) and higher organisms (A. salina) were tested as model microo...

Full description

Saved in:
Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 223; pp. 516 - 523
Main Authors: Lacasa, Engracia, Tsolaki, Efi, Sbokou, Zouboulia, Rodrigo, Manuel Andrés, Mantzavinos, Dionissios, Diamadopoulos, Evan
Format: Journal Article
Language:English
Published: Elsevier B.V 01-05-2013
Subjects:
Artemia salina
bacteria
Ballast
Ballast water
Brackish
brackish water
chemical engineering
Chlorine
Current density
Diamonds
disinfection
Electric field
Electrochemical disinfection
electrochemistry
Electrodes
Escherichia coli
Inactivation
indicator species
mechanical stress
oxidation
reactive oxygen species
Salinity
Simulation
Artemia salina
Electric field
Electrochemical disinfection
Chlorine
Ballast water
Escherichia coli
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•Ballast water treatment deals with invasive species elimination.•Electrochemical disinfection is an easy to apply process on-board.•Modeling of chlorine generation during electrochemical disinfection was performed.•Both bacteria (E. coli) and higher organisms (A. salina) were tested as model microorganisms. 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 30g/L NaCl simulating brackish and ballast water, respectively), current density (up to 1273A/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 45min of batch treatment at 255A/m2 (corresponding to about 200mg/L of produced chlorine) and this increased to 60min 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 5min of batch operation at 127A/m2, whereas the concentration of produced chlorine was less than 20mg/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.
Bibliography:http://dx.doi.org/10.1016/j.cej.2013.03.003
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2013.03.003