A photolysis coefficient for characterizing the response of aqueous constituents to photolysis  

作　　者：David R. HOKANSON Ke LI R. Rhodes TRUSSELL 

机构地区：[1]Trussell Technologies, Inc., Pasadena, CA 91101, USA [2]College of Engineering, University of Georgia, Athens, GA 30602, USA

出　　处：《Frontiers of Environmental Science & Engineering》2016年第3期428-437,共10页环境科学与工程前沿（英文）

摘　　要：UV photolysis and UV based advanced oxidation processes （AOPs） are gaining more and more attention for drinking water treatment. Quantum yield （Ф） and molar absorption coefficient （ε） are the two critical parameters measuring the effectiveness of photolysis of a compound. The product of the two was proposed as a fundamental measure of a constituent＇s amenability to transformation by photolysis. It was shown that this product, named the photolysis coefficient, kp, can be determined using standard bench tests and captures the properties that govern a constituent＇s transformation when exposed to light. The development showed the photolysis coefficient to be equally useful for microbiological, inorganic and organic constituents. Values of kp calculated by the authors based on quantum yield and molar absorption coefficient data from the literature were summarized. Photolysis coefficients among microorganisms ranged from 8500 to more than 600000 and are far higher than for inorganic and organic compounds, which varied over a range of approximately 10 to 1000 and are much less sensitive to UV photolysis than the microorganisms.UV photolysis and UV based advanced oxidation processes （AOPs） are gaining more and more attention for drinking water treatment. Quantum yield （Ф） and molar absorption coefficient （ε） are the two critical parameters measuring the effectiveness of photolysis of a compound. The product of the two was proposed as a fundamental measure of a constituent＇s amenability to transformation by photolysis. It was shown that this product, named the photolysis coefficient, kp, can be determined using standard bench tests and captures the properties that govern a constituent＇s transformation when exposed to light. The development showed the photolysis coefficient to be equally useful for microbiological, inorganic and organic constituents. Values of kp calculated by the authors based on quantum yield and molar absorption coefficient data from the literature were summarized. Photolysis coefficients among microorganisms ranged from 8500 to more than 600000 and are far higher than for inorganic and organic compounds, which varied over a range of approximately 10 to 1000 and are much less sensitive to UV photolysis than the microorganisms.

关 键 词：UV photolysis DISINFECTION advanced oxidation N-NITROSODIMETHYLAMINE quantum yield absorption coefficient 

分 类 号：X132[环境科学与工程—环境科学] O644.1[理学—物理化学]