Electrolysis Sodium Hypochlorite Generation from Sodium Chloride Solution
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Date
2021-01
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Addis Ababa University
Abstract
The scarcity of fresh-water has become one of humanity's most pressing problems today. Chlorine was chosen as the disinfection of choice because it was cost-efficient, effective, and easy to use. Chlorine was introduced to water as a gas or a liquid (NaOCl). For safety reasons, NaOCl was frequently used instead of chlorine gas. It was a viable disinfectant for controlling microbial growth and sanitizing inert surfaces. One of the alternate ways used as value-added disinfection was on-site electrolytic NaOCl production. To achieve the goal, a batch laboratory-scale reactor was used, with a Ti/IrO2 anode and stainless-steel cathode.
To find the best optimal conditions, the RSM experimental design was used. The effects of the most important variables, the creation of optimal conditions, and the construction of the optimum sodium hypochlorite concentration were studied. The experiment was carried out with a variety of variables, including NaCl content, electric potential, electrode gap, and electrolysis time. At 32g NaCl, 7v, 2.5cm electrode gap, and 70min with pH of 11 and ambient temperature of 25°C, 7.2g Cl2/l of NaOCl was created under the best-optimized circumstances for NaOCl generation. The results show that the NaOCl generated can disinfect water and inert surfaces.
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Keywords
sodium hypochlorite, electrolysis, on-site, experimental design