کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4482784 1316869 2012 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Improving on SUVA254 using fluorescence-PARAFAC analysis and asymmetric flow-field flow fractionation for assessing disinfection byproduct formation and control
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Improving on SUVA254 using fluorescence-PARAFAC analysis and asymmetric flow-field flow fractionation for assessing disinfection byproduct formation and control
چکیده انگلیسی

Several challenges with disinfection byproduct (DBP) control stem from the complexity and diversity of dissolved organic matter (DOM), which is ubiquitous in natural waters and reacts with disinfectants to form DBPs. Fluorescence parallel factor (PARAFAC) analysis and asymmetric flow-field flow fractionation (AF4) were used in combination with free chlorine DBP formation potential (DBPFP) tests to study the physicochemical DOM properties and DBP formation in raw- and alum-coagulated waters. Enhanced coagulation with alum became more effective at removing DBP-precursors as the pH decreased from 8 to 6. AF4-UV254 fractograms indicated enhanced coagulation at pH 6 preferentially removed larger DOM, whereas no preferential size removal occurred at pH 8. Fluorescence-PARAFAC analysis revealed the presence of one protein-like and three humic-like fluorophore groups; stronger linear correlations were found between chloroform and the maximum intensity (FMAX) of a humic-like fluorophore (r2 = 0.84) than with SUVA254 (r2 = 0.51). This result indicated that the fluorescence-PARAFAC approach used here was an improvement on SUVA254, i.e., fluorescence-based measurements were stronger predictors of chloroform formation.

Figure optionsDownload high-quality image (247 K)Download as PowerPoint slideHighlights
► Enhanced coagulation at pH 6 preferentially removed the larger-sized DOM fraction.
► Enhanced coagulation at pH 8 resulted in uniform DOM size removal.
► One protein-like and three humic-like fluorophore groups were identified.
► TCM was the predominant DBP.
► TCM was more strongly correlated with FMAX of a humic-like fluorophore (r2 = 0.84) than SUVA254 (r2 = 0.51).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 46, Issue 9, 1 June 2012, Pages 2927–2936
نویسندگان
, ,