Removing Bacillus Subtilis Spores From Drinking Water Using a Bipolar Electrochemical Method Publisher



Arjmand MM^{1, 2} ; Rezaee A¹ ; Nasseri S³ ; Eshraghi SS⁴
Source: International Journal of Electrochemical Science Published:2016

Abstract

Inactivation ability of persistent microorganisms, is great advantage of desirable disinfection method. As the main factor involved in the waterborne transmission of gastroenteritis, Cryptosporidium is highly resistant to conventional disinfection methods and is a major challenge to water supply systems across the world. In the assessment of water quality, the use of a bacterial spore model is recommended as a surrogate to the actual use of Cryptosporidium. In recent years, electrochemical processes have become more emphasized as eco-friendly and efficient technologies in water treatment and disinfection. The present study was conducted to present a suitable strategy for improving the quality of drinking water. The bipolar electrochemical system examined consisted of an anode electrode, a cathode electrode and two bipolar electrodes all made of stainless steel with dimensions of 4×8 cm and distanced 1 cm apart from each other in a glass reactor containing 200 cc of drinking water. The monopolar one, designe by the same figuration, only without the two bipolar electrodes. The variables examined included Bacillus subtilis spore counts of 102-104 CFU/mL, an electrochemical reaction time ranging from 15 to 60 min, a current density of 2-5 mA/cm2 and normal-pH and normal-temperature water. The findings showed that, while improving the system's current and accelerating the electrochemical reactions, bipolar electrochemical systems are capable of the full removal of Bacillus subtilis spores with a current density of 5 mA/cm2 and an electrochemical reaction time of 60 minutes. © 2016 The Authors.