J Korean Soc Environ Eng. 2016; 38(6): 329-333.
Published online 2016 June 30.
Composite Oxidizing Agents Generation Using Electrolysis of Dilute Hydrochloric Acid
Department of Environmental Engineering, Daegu University
Received 2016 March 29; Accepted 2016 April 27.
ABSTRACT
Disinfection by electrolysis would be useful for small wastewater treatment plant, combined sewer overflow, ballast water, swimming pool, and fish farming, where the transport, storage, and the use of chlorine gas is limited. This study investigated the feasibility of the electrolysis of dilute hydrochloric acid (HCl) for disinfection. The effects of HCl concentration, voltage and reaction time on the generation of oxidizing agents, HOCl, O3, and H2O2, were examined in a series of batch test. The highest current efficiency was 99.3% which was found at 2.2%, 3 V, and 5 min of HCl concentration, voltage, and reaction time, respectively. Continuous electrolysis at 2.2% HCl, 3 V, and 5 min of the hydraulic retention time showed 97.4% of the current efficiency. Addition of sodium chloride up to 20 g/L linearly increased the oxidizing agents production. 92.2% of total coliforms were removed by the contact with the electrolyzed water.
Keywords :
Electrolysis, Oxidizing Agent, Current Efficiency, Voltage, Dilute Hydrochloric Acid
