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Design and operating parameters affecting an electrochlorination system
최주솔,윤제용,심수진 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.1
Electrolysis of aqueous sodium chloride has been widely used in the chloro-alkali process, and its operating parameters are well-known. This electrochemical mechanism can be applied to both on-site chlorine production for disinfecting water in small-scale drinking water treatment plants and as a portable chlorine generator for emergency use or for campers. However, the design information and operating parameters affecting the current efficiency and power consumption of small-scale electrochlorination systems are limited even though these systems have become popular. We investigate the significant design and operating parameters affecting current efficiency and power consumption in an electrochlorination system. IrO2 electrodes, NaCl concentration, current density, a separator, and temperature control were selected as the design and operating parameters in the two-electrode batch system. The results show that the most important parameter affecting current efficiency and power consumption of chlorine generation was NaCl concentration. At low NaCl concentrations (1000 mg/L),the type of anode, current density, and the separator considerably affected current efficiency and power consumption to generate chlorine, whereas at high NaCl concentrations (>35,000 mg/L), anode type became insignificant, with current efficiency >90% and power consumption of 4–6 Wh/g.
홍성호 ( Seong Ho Hong ),최주솔 ( Ju Sol Choi ) 대한상하수도학회 2007 상하수도학회지 Vol.21 No.3
There is no certain definition about advanced drinking water treatment but it is generally known as activated carbon process, membrane process or ozone process which can remove non-conventional pollutants such as taste and odor compounds, and micro-pollutants. There are more than 20 processes related to activated carbon as adsorber or biological activated carbon in Korea. The saturated carbon by pollutants can be reused by reactivation. However, the effect of reactivation on activated carbon is not well-understood in terms of changing physical properties of carbon to adsorption capacity of natural organic matter (NOM). In this study, the effects of reactivation on physical properties of activated carbon were investigated by isotherm and breakthrough of NOM. Ash content was increased from 8% to 13.3%. Iodine number is commonly used as an indicator for performance of reactivation. The iodine number was decreased about 20% after reactivating twice. The degree of reactivation can be evaluated by not only iodine number but also apparent density.