Integrated Principal Component Analysis of Microcystis Aeruginosa Dissolved Organic Matter and Assessment of UV-C Pre-Treatment on Cyanobacteria-Containing Water

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The intrinsic characteristic of chromophoric dissolved organic matter (CDOM) and bioactivity materials derived from toxic Microcystis aeruginosa was investigated. Fluorescence excitation emission matrix combined with parallel factor analysis (EEM-PARAFAC) determined six CDOM components, and principal component analysis (PCA) identified two integrated principle factors. PCA factor 1 mainly represented the intracellular and extracellular microbial active components, and factor 2 represented the extracellular residuals and degraded products. These two PCA factors accounted for 53 and 31% of the variance in nine parameters distributions, and were used to assess the variation pattern of DOM. The variation tendencies of PCA factors in experiments using single UV-C (254nm), UV-C/H2O2, UV-C/HCO3-, UV-C/NO3-, and UV-C/humic acid were estimated. Photolysis and photo-oxidation were dominating processes in single UV-C irradiation, and H2O2 improved photo-oxidation, resulting in high efficient removal of intracellular DOM and extracellular DOM. The presences of HCO3-, NO3- and humic acid had negative effects on the degradation of extracellular DOM, but little influence on intracellular DOM. Results revealed that UV-C/H2O2 can be considered as an option for the pretreatment of cyanobacteria-contained water, and EEM-PARAFAC-PCA can be applied to simplify multiple parameters in water treatment process, which would be benefit to water quality monitoring and management.



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