Determining the Reaction Rate of Electrochemical Process for Purification of Polluted Water

Document Type : Original Article

Authors

1 Environmental Health Engineering Department, Health School, Kashan University of Medical Sciences, Kashan, Iran

2 Statistics & Epidemiology Department, Health School, Kashan University of Medical Sciences, Kashan, Iran

3 Social Determinants of Health Research Center” and “Environmental Health Engineering Department, Health School”, Kashan University of Medical Sciences, Kashan, Iran

Abstract

Aims Turbidity in higher than standard levels, indicates failure in the water treatment plant.
An electrochemical disinfection process takes place through electricity transition between
two or more electrodes. This research aimed to determine the reaction rate of electrochemical
process for purification of polluted water.
Materials & Methods This is a bench scale, experimental study performed in a batch system
on synthetic wastewater. 1700ml of prepared synthetic wastewater was put in an electrolytic
cell and constant 600mA current was flowed into the cell content through merged aluminum
electrodes for 1 hour. Samples were taken from the batch in the beginning and every 10
minutes and were analyzed for, turbidity, Coliform bacteria (probably, confirmed and E. coli)
and Heterotrophic Plat Count. Fisher exact test was used to analyze data.
Findings All the parameters of turbidity, HPC, total coliform, confirmed coliform and E.
coli were decreased during the time. The electrochemical process reduced the average of
turbidity below 3NTU after 50 minutes (91.05% removal). The HPC number reduced from
130n/ml to 2.4n/ml (98.15% removal) after 50 minutes. No coliforms were seen after 40
minutes of the electrochemical process.
Conclusion 40 minutes of electrochemical process in 600mA by aluminum electrodes is the
optimum condition for removing the turbidity, Coliform bacteria (total, confirmed and E.
coli) and HPC from polluted water.

Keywords