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DOI : ,    Vol.28, No.4, 15 ~ 24, 2020
Title
Effect of Algal Organic Matter on the OH Radical Reactivity and Operating Condition in UV/H2O2 Advanced Oxidation Process
남숙현 Sookhyun Nam , 이주원 Juwon Lee , 김은주 Eunju Kim , 황태문 Tae-mun Hwang
Abstract
This study interrogates the influence of algal organic matter on hydroxyl radial (ㆍOH) scavenging factors. The ㆍOH scavenging factor represents the rate at which ㆍOH is scavenged by background substances in aqueous solutions, which is key to the design and operation of UV/H2O2 processes for water treatment. Extracellular organic matter (EOM) and intracellular organic matter (IOM) were extracted from cyanobacteria acquired from lake water. Synthetic water was manufactured by using either EOM or IOM, and the resulting hydroxyl radical scavenging factors were measured and compared. The organic properties of the EOM and IOM were analyzed by using liquid chromatography organic carbon detection (LC-OCD) and fluorescence excitation-emission matrices (F-FEM). Analyses revealed that EOM samples exhibited strong peaks associated with tryptophan-like, fulvic-like, and humic-like (excitation/emission 250-260/380-480) substances. By comparison, the tryptophan-like peak was dominant in IOM samples. Six components were observed in LC-OCD chromatograms, with neutrals being the highest component of both of EOM and IOM, yet EOM also had high humics and LMW acids. This study proposes a predictive model that estimates the optimal UV and H2O2 doses necessary to maximize the removal of target compounds. Removal of 90% of the target compound (D90) required 6.8 mg/L of hydrogen peroxide at 1200 mJ/㎠. When comparing theoretical prediction with experimental values, the difference in the elimination rate was less than 10%.
Key Words
Extracellular organic matter, Hydroxyl radial scavenging factor, Intracellular organic matter, UV, H2O2, 수산화라디칼 소모인자, 세포외 유기물질, 세포내 유기물질, 자외선, 과산화수소
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