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DOI : ,    Vol.28, No.4, 25 ~ 32, 2020
Characteristic of Chemical Oxygen Demand Removal Using Stainless Steel in Dyeing Wastewate
장성호 Seong-ho Jang , 김고은 Go-eun Kim , 강정희 Jeong-hee Kang , 송영채 Young-chae Song , 이원기 Won-ki Lee , 정병길 Byung-gil Jung , 이재용 Jae-yong Lee
Wastewater contaminated with dyes accounts for 8% of industrial wastewater emissions in South Korea and moreover contains substances that are only mildly decomposable, necessitating advanced treatment processes. Dyeing wastewater is typically treated by using chemical coagulation, advanced oxidation, or .biological methods, yet this waste includes organic matter (biochemical oxygen demand(BOD), chemical oxygen demand(COD), suspended solids (SS), and color that can not only be reduced by the activated sludge method. Advanced oxidation technologies for treating dye-contaminated wastewater are being developed worldwide. For example, electrochemical techniques have been adapted to treat industrial wastewater, including dyeing wastewater, and exhibit high removal efficiencies and short treatment times irrespective of the biodegradability of the contaminant. This study further investigates the electrochemical treatment of dyeing wastewater, specifically the effects of current density and electrolyte conditions on COD removal efficiency when using stainless steel electrodes. Without electrolyte, current densities of 20 A/m2, 40 A/m2 and 60 A/m2 corresponded to COD removal efficiencies of 49.3%, 71.2%, and 85.8%, respectively, after 60 minutes of operation. By comparison, the addition of NaCl as an electrolyte enhanced the removal efficiency by 11.1% on average across all current densities, compared to when NaCl was not added. Similar effects were observed when using Na2SO4 as an electrolyte, which produced 6.5% higher removal efficiencies on average at all current densities versus the case in which Na2SO4 was not added.
Key Words
COD, Dyeing wastewater, Electrochemical, Electrolyte, STS316, 유기물, 염색폐수, 전기화학적처리, 전해질, 스테인리스
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