Fluorescence spectroscopy as a tool for determination of organic matter removal efficiency at water treatment works

Bieroza, Magdalena; Bridgeman, John; Baker, Andy

doi:10.5194/dwes-3-63-2010

Cited by 48 publications

(18 citation statements)

References 34 publications

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“…In Figure 2.5b, coagulation was demonstrated to effectively decrease the fluorescence of all NOM components, with the largest decrease in the fulvic acid-like region (Farré et al 2016a). This is in agreement with other previous studies where DOC removal by coagulation showed linear relationship with the decrease of fluorescence in the humic and fulvic acid regions (Bieroza et al 2010, Gone et al 2009). Lowest fluorescence was observed after ozonation and BAC filtration (Figure 2.5b), suggesting the effectiveness of oxidation in transforming aromatic compounds.…”

Section: Fluorescence Spectroscopysupporting

confidence: 94%

“…Compared to absorbance, fluorescence spectroscopy is a more sensitive and selective characterization method. This technique has evolved from measurements of simple selected excitation or emission wavelengths to simultaneous collection of fluorescence measurements in a wide range of excitation and emission wavelengths (Bieroza et al 2010). It is widely applied to get spectral signatures or optical maps of water samples through a three-dimensional plot of excitation energy, emission wavelength and fluorescence intensity, known as excitation-emission matrix (EEM) (Chen et al 2003, Hudson et al 2007, Markechova et al 2013).…”

Section: Fluorescence Spectroscopymentioning

confidence: 99%

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Reducing disinfection byproduct formation potential using ozonation and biological drinking water treatment

Vera¹,

Andrew²

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The occurrence of natural organic matter (NOM) in source waters presents a concern in water treatment plants due to formation of toxic disinfection byproducts (DBPs). In this doctoral thesis, the fate of NOM during ozonation, biofiltration, and chlorination was investigated to identify important aspects in these processes that can be manipulated for better DBP control. Specifically, this thesis studied (1) reaction mechanisms of ozone with dissolved organic nitrogen (DON), an important fraction of NOM that forms nitrogenous DBPs, (2) role of ozone and• OH-mediated attack on NOM and DBP formation during chlorination, and (3) impact of ozonation on biodegradability of DBP precursors.The reaction of ozone with DON (Chapter 4) was observed to produce various transformation products including nitrate (NO 3 -) and ammonium (NH 4 + residual after 24 h = 1 -2 mg/L) as follows: THM4 (37%), HAA8 (44%), CH (107%), HK2 (97%), HAN4 (33%), trichloroacetamide (TCAM, 43%), and AOX (27%), but a decrease in concentrations of THNM2 (43%). Coupling ozonation with biofiltration prior to chlorination effectively lowered the formation potentials of all DBPs including CH, HK2, and THNM2, all of which increased after ozonation. The dynamics of DBP formation potentials during BAC filtration at different EBCTs followed first-order reaction kinetics. Minimum steady-state concentrations were attained at an EBCT of 10 -20 min, depending on the DBP species. The rate of reduction in DBP formation potentials varied among individual species before reaching their minimum concentrations. CH, HK2, and THNM2 had the highest rate constants of between 0.5 and 0.6 min -1 followed by HAN4 (0.4 min -1 ), THM4 (0.3 min -1 ), HAA8 (0.2 min -1 ), and AOX (0.1 min -1 ). Relative to concentrations after ozonation, the reduction in formation potential for most DBPs (e.g., at 15 min EBCT) was less than 50% but was higher than 70% for CH, HK2, and THNM2. The formation of bromine-containing DBPs increased with increasing EBCT likely due to an increase in Br -/DOC ratio.-iv- Dr. Wolfgang Gernjak co-advised me during my PhD candidature and played an integral part in all the chapters of this thesis. He was involved in the initial conceptual thinking, to developing research ideas, identifying appropriate experimental design, and interpreting research data. He also provided critical reviews in all the manuscripts. Declaration by authorDr. Maria José Farré, who was my principal advisor in 2013, is recognized for sharing her expertise in disinfection byproduct research (i.e., from laboratory techniques, instrumentation, and theory). Our regular exchange of viewpoints were essential in the conception of research ideas and approaches related to DBPs. She was also highly involved in the writing and review of manuscripts.Prof. Urs von Gunten, who is a world-leading expert in application of ozone for water treatment, was my host professor during my research visit at École Polytechnique Fédérale de Lausanne (EPFL)where I performed the bulk of the experiments repor...

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Section: Fluorescence Spectroscopysupporting

confidence: 94%

Section: Fluorescence Spectroscopymentioning

confidence: 99%

Reducing disinfection byproduct formation potential using ozonation and biological drinking water treatment

Vera¹,

Andrew²

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“…The research applications of aquatic fluorescence tracking have also been extended to include drinking water sources [68]. Several fluorescence studies have recently been undertaken to investigate the performance of drinking water treatment processes and have been able to successfully detect membrane fouling events [109,110] as well as to quantify organic matter removal and efficiency [111][112][113][114]. This area has also seen the early development of a deep-UV LED and laser-induced fluorescence system for fluorescence detection of water-dissolved organic species, looking toward the real-time fluorescence monitoring of drinking water [115].…”

Section: Identification Of Contamination Using Fluorescence Fingerprimentioning

confidence: 99%

Cross-connection detection in Australian dual reticulation systems by monitoring inherent fluorescent organic matter

Hambly

Henderson

Baker

et al. 2012

Environmental Technology Reviews

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New housing developments are now commonly incorporating dual reticulation water systems for the redistribution of recycled water back to households for non-potable use. Within such distribution systems is the potential for cross-connections between recycled and drinking water pipelines, and a number of such events have been documented both in Australia and internationally. While many cross-connections are unlikely to present a source of health concern given the high level of recycled water treatment, they do have the potential to negatively impact public confidence in dual reticulation systems. A rapid and highly sensitive method of cross-connection detection is required to increase consumer confidence in the construction and maintenance of such recycled water distribution systems. This paper reviews a number of current and potential cross-connection detection methods, highlighting the use of fluorescence spectroscopy as a highly promising analytical tool for portable cross-connection detection.

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“…The fluorescence intensity is linear proportion to the humic acid concentration [2]. Fluorescent technology is often used to measure the concentration of humic acid in natural waters [3][4][5]. The carboxyl and phenolic functional groups of humic acid contains hydroxyl bonds, which are the main bonding position with the metal ions.…”

Section: Introductionmentioning

confidence: 99%

Finding the Reaction Constant Between Humic Acid and Metal Ions by Fluorescence Quenching Effect

Cheng¹,

Lu²,

Yu³

et al. 2018

IJET

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Humic acid was used as the removal target for evaluating the coagulation efficiency in this study. When the metal ions mix with humic acid solution, a Fluorescence quenching effect may be observed conditionally. This effect can be described by Stern-Volmer linear equation which can be used for quantifying the quenching constant (KQ) of the Fluorescence quenching effect. In addition, the result of the quenching constant (KQ) was used to explain the electron-neutralization capability of the metal ions at different pH. The results indicated that there is no significant Fluorescence quenching effect between the additions of monovalent Na+ ion, divalent Ca2+ and humic acid. Otherwise, when pH of the FeCl3 solution was between 4.5 and 5.5, fluorescence quenching effect obviously occurred. The maximum KQ value was found to be 305,990 at pH 5. It means that the higher KQ value is, the better complex reaction between humic acid and aluminum salts will be. Through the KQ value study, the optimum pH can be quantified when humic acid solution is reacted with ferric ion.

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Fluorescence spectroscopy as a tool for determination of organic matter removal efficiency at water treatment works

Cited by 48 publications

References 34 publications

Reducing disinfection byproduct formation potential using ozonation and biological drinking water treatment

Reducing disinfection byproduct formation potential using ozonation and biological drinking water treatment

Cross-connection detection in Australian dual reticulation systems by monitoring inherent fluorescent organic matter

Finding the Reaction Constant Between Humic Acid and Metal Ions by Fluorescence Quenching Effect

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