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Xue S.,Liaoning University | Xue S.,Key Laboratory of Water Environment Biomonitoring and Ecological Security of Liaoning Province | Zhao Q.,Harbin Institute of Technology | Wei L.,Harbin Institute of Technology | And 4 more authors.
Environmental Monitoring and Assessment | Year: 2013

This work investigated the effect of soil aquifer treatment (SAT) operation on the fluorescence characteristics of dissolved organic matter (DOM) fractions in soils through laboratory-scale soil columns with a 2-year operation. The resin adsorption technique (with XAD-8 and XAD-4 resins) was employed to characterize the dissolved organic matter in soils into five fractions, i.e.; hydrophobic acid (HPO-A), hydrophobic neutral (HPO-N), transphilic acid (TPI-A), transphilic neutral (TPI-N), and hydrophilic fraction (HPI). The synchronous fluorescence spectra revealed the presence of soluble microbial byproduct- and humic acid-like components and polycyclic aromatic compounds in DOM in soils, and SAT operation resulted in the enrichment of these fluorescent materials in all DOM fractions in the surface soil (0-12.5 cm). More importantly, the quantitative method of fluorescence regional integration was used in the analysis of excitation-emission matrix (EEM) spectra of DOM fractions in soils. The cumulative EEM volume (Φ T, n ) results showed that SAT operation led to the enrichment of more fluorescent components in HPO-A and TPI-A, as well as the dominance of less fluorescent components in HPO-N, TPI-N, and HPI in the bottom soil (75-150 cm). Total Φ T, n values, which were calculated as ΦT,n × DOC, suggested an accumulation of fluorescent organic matter in the upper 75 cm of soil as a consequence of SAT operation. The distribution of volumetric fluorescence among five regions (i.e.; P i, n ) results revealed that SAT caused the increased content of humic-like fluorophores as well as the decreased content of protein-like fluorophores in both HPO-A and TPI-A in soils. © 2012 Springer Science+Business Media Dordrecht.


Xue S.,Liaoning University | Xue S.,Key Laboratory of Water Environment Biomonitoring and Ecological Security of Liaoning Province | Wen Y.,Liaoning University | Tie M.,Liaoning University | And 7 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2013

The effect of enhanced coagulation on the chlorination activity and fluorescence characteristics of dissolved organic matter (DOM) in the secondary treated effluent from the B wastewater treatment plant (Shenyang) was investigated. FeCl3·6H2O was used as a coagulant in this study. DOM was fractionated using XAD resins into five fractions: hydrophobic acid (HPO-A), hydrophobic neutral (HPO-N), transphilic acid (TPI-A), transphilic neutral (TPI-N) and hydrophilic fraction (HPI). The results showed that a DOC removal of 55.3% was obtained under the enhanced coagulations (coagulant dosage 80 mg·L-1, pH=5.00). The removal of HPO-A by enhanced coagulation was the highest while that of HPI was the lowest. HPO-N increased in specific trihalomethane formation potential (STHMFP), where the other four DOM fractions decreased in STHMFP, as a result of enhanced coagulation. Enhanced coagulation could effectively remove fulvic acid-like fluorescent materials and the polycyclic aromatic fluorescent materials with more aromatic rings and a higher degree of conjugation. The correlation between DOC removal and fluorescence intensity reduction of DOM fractions resulted from enhanced coagulation was not significant.

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