Influence of operating conditions and wastewater-specific parameters on the electrochemical bulk disinfection of biologically treated sewage at boron-doped diamond (BDD) electrodes

The aim of this study was to investigate an electrochemical process for bulk disinfection of biologically treated sewage. The influence of operating conditions (current density and flow rate) on the electrochemical formation of free chlorine in the sewage was determined. Furthermore, the effect of w...

Full description

Saved in:
Bibliographic Details
Published in:Desalination and water treatment 2012-08, Vol.46 (1-3), p.160-167
Main Authors: Haaken, Daniela, Dittmar, Thomas, Schmalz, Viktor, Worch, Eckhard
Format: Article
Language:English
Subjects:
Applied sciences
Boron
Boron-doped diamond electrode
By-products
Byproducts
Capacity
Chlorate
Chlorine
Current density
Deactivation
Diamonds
Disinfection
Disinfection by-products
Dissolved organic carbon
E coli
Effluents
Electric charge
Electrochemical disinfection
Electrochemical oxidants
Electrochemistry
Electrodes
Energy
Energy expenditure
Exact sciences and technology
Flow rates
Flow velocity
Inactivation
Parameters
Perchlorate
Perchloric acid
pH effects
Pollution
Reaction time
Sewage
Sewage disposal
Sewage treatment
Treated sewage
Wastewater
Wastewater reclamation
Wastewater treatment
Water treatment and pollution
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The aim of this study was to investigate an electrochemical process for bulk disinfection of biologically treated sewage. The influence of operating conditions (current density and flow rate) on the electrochemical formation of free chlorine in the sewage was determined. Furthermore, the effect of wastewater-specific parameters on the inactivation of Escherichia coli was studied. The disinfection capacity is primarily influenced by the concentration of electrochemically produced free chlorine. The production rate of free chlorine is independent of the flow rate within the range of 25–125 L h-1. The investigations have also shown that the electrochemical disinfection of E. coli in secondary effluents with BDD electrodes proceeds effectively at an electric charge input of 0.1–0.15 Ah L-1 corresponding to an energy expenditure of 2.0–2.6 kWh m-3. The electrochemically generated concentration of free chlorine (c = 0.4–0.6 mg L-1) is sufficient for an E. coli reduction of four log levels under the following conditions: after-reaction time of 15–20 min, T > 6°C, pH 
ISSN:1944-3986
1944-3994
1944-3986
DOI:10.1080/19443994.2012.677523