Experimental design as a tool for studying trihalomethanes formation parameters during water chlorination

Bach, Larissa; Garbelini, Ellery R.; Stets, Sandra; Peralta‐Zamora, Patricio; Emmel, Alexandre

doi:10.1016/j.microc.2015.07.005

Cited by 5 publications

(2 citation statements)

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“…At 72 h, the limit of the spectra was roughly 350 and 520 nm on the excitation and emission wavelength axes, respectively, with much attenuated areal cover that disappeared completely at 168 h. Fluorescence signal at longer wavelength has been associated with a higher degree of aromatic polycondensation and high molecular weight. Signals at shorter wavelength have been linked with the presence of aliphatic species and low degree of aromatic polycondensation . Consequently, the degradation of HA proceeded with the decrease in polycondensation and molecular weight.…”

Section: Resultsmentioning

confidence: 99%

“…Signals at shorter wavelength have been linked with the presence of aliphatic species and low degree of aromatic polycondensation. 30 Consequently, the degradation of HA proceeded with the decrease in polycondensation and molecular weight. These modifications of the fluorescence spectra in Figure 2 with time mirror the measured reduction in UV 254 and SUVA in Figure 1, further confirming the preferential oxidation of the aromatic structures of HA.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Activation of Persulfate at Waste Heat Temperatures for Humic Acid Degradation

Ike

Orbell

Duke

2018

ACS Sustainable Chem. Eng.

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Humic acid (HA) as a major constituent of natural organic matter (NOM) in raw water presents major challenges to drinking water production including membrane fouling and serving as a precursor for the production of disinfection byproducts (DBPs). This study demonstrates the feasibility of HA degradation by heat-activated persulfate (PS) mainly at a waste heat temperature of 40 °C, but also at 60 and 90 °C in which ∼70% TOC loss was achieved within 168, 24, and 1 h, respectively. The use of waste heat for water treatment eliminates reliance on electricity, which is a requirement for conventional advanced oxidation processes. Heat-activated PS treatment of synthetic raw water at 40 °C was also shown to significantly reduce ultrafiltration membrane fouling. Low concentration of chloride (≤0.9 mM) accelerated PS degradation of HA, but the promotion was lost at higher concentration (≥9 mM). HA spiked into tap water was degraded by PS even at 25 °C, suggesting activation by trace minerals present within regulatory limits. Overall, the results of this study promise a sustainable and low-cost water treatment option.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%