Effect of chloramine and its combination with chlorine dioxide on degradation of dissolved organic matter in raw water distribution system - Details

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Abstract：

Effects　of　chloramine　(NH2Cl)　and　its　combination　with　chlorine　dioxide　(NH2Cl/ClO2)　on　dissolved　organic　matter　(DOM)　were　studied　by　annular　reactor.　The　characteristic　of　DOM　was　evaluated　by　monitoring　removal　efficiencies　of　dissolved　organic　carbon　(DOC)　and　UV254,　overall　DOM　concentration,　specific　DOM　absorbance　ratio　and　excitation-emission　matrices　spectra　(EEMs).　The　results　showed　that　the　oxidants　significantly　affected　the　removal　of　overall　DOM,　DOC　and　UV254.　The　DOM　removal　efficiency　was　lower　after　NH2Cl/ClO2　compared　with　that　of　NH2Cl,　however,　the　recovery　efficiencies　speed　of　them　were　similar　in　the　two　cases.　The　degradation　of　DOM,　DOC　and　UV254　recovered　on　5th　day,　4th　day　and　1st　day　after　oxidation,　respectively.　Aromatic　rings　were　substituted　predominantly　with　polar　groups　after　oxidation,　and　thus　the　oxidant　increased　the　biodegradable　DOM.　Overall,　DOM　fluorescence　intensity　had　a　decrease　potential　after　oxidant,　particularly　for　tryptophan-like　fluorescence　and　humic-like　fluorescence.　The　aromatic　rings　were　easier　targeted　by　NH2Cl/ClO2,　however,　much　more　functional　groups　such　as　hydroxyl,　carboxyl　and　carbonyl,　and　higher　biodegradable　DOM　were　observed　after　NH2Cl,　resulting　in　higher　biodegradation　of　DOM.　The　DOC　and　UV254　degradation　after　NH2Cl　or　NH2Cl/ClO2　could　both　recover　to　a　higher　level　than　that　in　control.　Therefore,　compared　to　single　NH2Cl,　NH2Cl/ClO2　was　proposed　to　use　in　the　raw　water　distribution　system　for　decreasing　oxidant　by-products.　©All　Right　Reserved

Keyword：

Dissolution Water distribution systems Organic carbon Fluorescence Oxidants Efficiency Recovery Biogeochemistry Oxidation Aromatic compounds Chlorine compounds Degradation Amino acids Biodegradation

Author Community：

[ 1 ] [Xiang, Kun]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing; 100124, China
[ 2 ] [Yang, Yanling]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing; 100124, China
[ 3 ] [Li, Xing]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing; 100124, China
[ 4 ] [Zhang, Da]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing; 100124, China
[ 5 ] [Huang, Liu]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing; 100124, China
[ 6 ] [Chen, Nan]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing; 100124, China
[ 7 ] [Wang, Shuai]Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing; 100124, China

Reprint Author's Address：

杨艳玲
[yang, yanling]key laboratory of beijing for water quality science and water environment recovery engineering, beijing university of technology, beijing; 100124, china

Email：

yangyanling@bjut.edu.cn

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