The electrochemical removal of bacteria from drinking water

Abstract

Effective disinfection is a particular stage of drinking-water treatment and is an important process for the removal of pathogenic microorganisms from the water. Germs resistant to common disinfectants are a major challenge in drinking water treatment across the world. The present study was conducted to compare the electrochemical removal of Escherichia coli and spores of Bacillus subtilis as indicative and resistant bacteria in drinking water, respectively. A reactor designed with a capacity of 200 cc and containing steel electrodes was selected for the reactions. The number of bacteria (CFU/ mL), the electrochemical reaction time (min), the voltage (v), the electric current intensity (mA), ambient temperature of 25°C and natural pH of drinking water (7.4) were fixed as the operating parameters of the study. Based on the findings of this study, after applied voltage, reaction time is the most effective factor in increasing microbial removal efficiency. The optimal reaction time for the removal of Bacillus subtilis spores, Bacillus subtilis and E. coli was 5, 90 and 120 min, respectively. By establishing a potential difference of 4.5 and 8 V in the reactor, the number of Bacillus subtilis spores after the expiry of 2 h was 2 CFU/mL and 0 CFU/mL, respectively.

Optimization of free chlorine, electric and current efficiency in an electrochemical reactor for water disinfection purposes by RSM

“…In the electrolysis of electrolyte containing chloride ions, chlorine is generated at the anode (Eq. ( 4)) and hydrogen gas is produced at the cathode [11]. Due to the dissociation of the produced chlorine in water, hypochlorite and chloride ions are produced as illustrated by Eq.…”

Green polymeric nanomaterials for the photocatalytic degradation of dyes: a review

“…As a consequence, wastewater remediation and water recirculation are now the major research focus (Wen et al 2019;Karimi-Maleh et al 2020a). Particularly, the regulation of water contamination and recycling the wastewater should be improved in drought-affected countries (Gholami et al 2019).…”

Effectiveness of Ozone Gas on Airborne Virus Inactivation in Enclosed Spaces: A Review Study

“…One of the most promising methods for virus inactivation in indoor air is ozone gas application (Tanaka et al 2009). Ozone, the triatomic form of oxygen (O 3 ) is a powerful oxidizing agent, frequently used in the pharmaceutical and food industries and, water disinfection, as well as the environmental control of pathogenic microorganisms (Gholami et al 2019;Pekovic and Kacimi 2015). Ozone is 25 times more effective than hypochloric acid (HOCl), and 2,500 to 3,000 times more potent than hypochlorite (OCl − ) (Gholami, Naderi, and Moghaddam 2018;Rojas-Valencia 2011).…”