Degradation of geosmin and 2-methylisoborneol in water with UV/chlorine: Influencing factors, reactive species, and possible pathways

Ma, Li; Wang, Chaoyi; Li, Haipu; Peng, Fangyuan; Yang, Zhaoguang

doi:10.1016/j.chemosphere.2018.08.029

Cited by 41 publications

(11 citation statements)

References 51 publications

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“…Cl – and HCO 3 – are common ions in natural water bodies . Hence, effects of Cl – and HCO 3 – on SMX degradation by UVA-LED/Fe(VI) were investigated at pH 8.0 and the results are displayed in Figure S23.…”

Section: Resultsmentioning

confidence: 99%

UVA-LED-Assisted Activation of the Ferrate(VI) Process for Enhanced Micropollutant Degradation: Important Role of Ferrate(IV) and Ferrate(V)

Yang

Mai

Cheng

et al. 2021

Environ. Sci. Technol.

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This paper investigated ultraviolet A light-emitting diode (UVA-LED) irradiation to activate Fe(VI) for the degradation of micropollutants (e.g., sulfamethoxazole (SMX), enrofloxacin, and trimethoprim). UVA-LED/Fe(VI) could significantly promote the degradation of micropollutants, with rates that were 2.6–7.2-fold faster than for Fe(VI) alone. Comparatively, UVA-LED alone hardly degraded selected micropollutants. The degradation performance was further evaluated in SMX degradation via different wavelengths (365–405 nm), light intensity, and pH. Increased wavelengths led to linearly decreased SMX degradation rates because Fe(VI) has a lower molar absorption coefficient at higher wavelengths. Higher light intensity caused faster SMX degradation, owing to the enhanced level of reactive species by stronger photolysis of Fe(VI). Significantly, SMX degradation was gradually suppressed from pH 7.0 to 9.0 due to the changing speciation of Fe(VI). Scavenging and probing experiments for identifying oxidative species indicated that high-valent iron species (Fe(V)/Fe(IV)) were responsible for the enhanced degradation. A kinetic model involving target compound (TC) degradation by Fe(VI), Fe(V), and Fe(IV) was employed to fit the TC degradation kinetics by UVA-LED/Fe(VI). The fitted results revealed that Fe(IV) and Fe(V) primarily contributed to TC degradation in this system. In addition, transformation products of SMX degradation by Fe(VI) and UVA-LED/Fe(VI) were identified and the possible pathways included hydroxylation, self-coupling, bond cleavage, and oxidation reactions. Removal of SMX in real water also showed remarkable promotion by UVA-LED/Fe(VI). Overall, these findings could shed light on the understanding and application of UVA-LED/Fe(VI) for eliminating micropollutants in water treatments.

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Section: Resultsmentioning

confidence: 99%

UVA-LED-Assisted Activation of the Ferrate(VI) Process for Enhanced Micropollutant Degradation: Important Role of Ferrate(IV) and Ferrate(V)

Yang

Mai

Cheng

et al. 2021

Environ. Sci. Technol.

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“…Solution temperature was measured before and after the experiments. Liquid samples (2.5 mL) were taken periodically (5,10,20,40, and 60 min) with catalyst retained by a magnet. The EMF output power was varied from 1.18 to 3.45 kW to examine the influence on degradation kinetics.…”

Section: Assembly Of the Electromagnetic Field (Emf)mentioning

confidence: 99%

“…Advanced oxidation processes (AOP) are widely explored to address the deficiency of treatment for those algogenic micropollutants using many conventional water treatment processes such as adsorption, biofiltration, and biodegradation. − For the odor removal, UV photocatalysis such as UV/H 2 O 2 , UV/ozonation, UV/permanganate, UV/persulfate, and UV/chlorine have been reported. Additionally, the heterogeneous catalytic processes under UV or visible light irradiation are also reported, where photocatalysts such as TiO 2 , , C-TiO 2 , Fe–N codoped TiO 2 , Pt-TiO 2 , reduced graphene oxide loading in Fe 3 O 4 (rGOF), Cu/TiO 2– x /CoP, ZnO, ZnOOH, and ZnO/γ-Al 2 O 3 absorb photo energy and produce reactive radical species.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Electromagnetic Catalysis and Degradation of Algogenic Odor Using Fe₃O₄ Nanoparticles with Tannin Coating

et al. 2021

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Eutrophication in water supply systems results in harmful algal blooms and water pollution such as unpleasant taste and odor, especially in summer seasons. 2-Methylisoborneol (2-MIB) and geosmin are two typical musty odor compounds produced by blue-green algae. This study evaluated an electromagnetic catalysis process that involves the use of the electromagnetic field (EMF) to catalyze surface reactions on Fe 3 O 4 nanoparticles with/without tannin coating (Fe 3 O 4 @tannin). The EMF field distribution from different induction coil types and heating of the solution or catalyst were characterized. The effects of coil type, exposure time, and catalyst type on the removal rates were then evaluated and optimized with methylene blue. Further, the removal mechanisms of 2-MIB and geosmin were analyzed with different combinations of solution heating and additions of H 2 O 2 , EMF, and Fe 3 O 4 @tannin. The highest removal (97% and 98%) for 2-MIB and geosmin was obtained when Fe 3 O 4 @tannin nanoparticles were exposed to H 2 O 2 and EMF, which resulted in a potential Fenton-like reaction based on radical detection. The findings support water treatment innovations with nontraditional catalysis processes.

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“…Chlorine-based biocides are commonly used to control the organisms that create T&O compounds (Piriou et al, 2001), yet some of the problematic species are known to be resistant to monochloramine at concentrations commonly used in water disinfection and distribution (Jensen et al, 1994). Use of ultraviolet (UV) photolysis in conjunction with advanced oxidation processes (AOPs) such as hydrogen peroxide or chlorine are used in water disinfection and may help to degrade geosmin and MIB (Ma et al, 2018;Stefan, 2017;Wang et al, 2015) but are not widely used for this purpose. There continues to be an acute need for non-chlorinated agents that reduce the algae and bacteria that cause T&O issues in drinking water and that contribute to disinfection byproducts produced by their reaction with disinfectants.…”

Section: Introductionmentioning

confidence: 99%

Geosmin reduction by algaecide application to drinking water: field scale efficacy and mechanistic insights

Hammond

Murri

Mastitsky³

et al. 2021

Heliyon

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Ten years of field data from an Oklahoma drinking water utility were analyzed for the effects of an acid-stabilized, ionic copper algaecide/bactericide called EarthTec on geosmin concentrations in the water traveling by pipeline from the source lake to a water treatment plant. The data show that geosmin already present in the raw water is reduced more during periods of applying algaecide than when not. Median reduction in geosmin concentration from pipe intake to pipe outfall by natural degradation without addition of algaecide was 5.6 ng/L removed (56.7% reduction) and improved to 126 ng/L removed (83% reduction) during periods the algaecide was being dosed at 1 μL/L, equivalent to 0.06 mg/L as copper. A laboratory study to replicate the phenomenon at bench-scale showed that either the algaecide itself or its copper-free acidic carrier can be used to depress pH and drive a reaction converting geosmin to an odorless dehydration product, argosmin. Algaecides intuitively reduce the organisms that produce geosmin, but this study shows that geosmin already present in the water is also being reduced through chemical conversion to the odorless argosmin, representing a novel means of geosmin removal in drinking water.

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Degradation of geosmin and 2-methylisoborneol in water with UV/chlorine: Influencing factors, reactive species, and possible pathways

Cited by 41 publications

References 51 publications

UVA-LED-Assisted Activation of the Ferrate(VI) Process for Enhanced Micropollutant Degradation: Important Role of Ferrate(IV) and Ferrate(V)

UVA-LED-Assisted Activation of the Ferrate(VI) Process for Enhanced Micropollutant Degradation: Important Role of Ferrate(IV) and Ferrate(V)

Characterization of Electromagnetic Catalysis and Degradation of Algogenic Odor Using Fe₃O₄ Nanoparticles with Tannin Coating

Geosmin reduction by algaecide application to drinking water: field scale efficacy and mechanistic insights

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Degradation of geosmin and 2-methylisoborneol in water with UV/chlorine: Influencing factors, reactive species, and possible pathways

Cited by 41 publications

References 51 publications

UVA-LED-Assisted Activation of the Ferrate(VI) Process for Enhanced Micropollutant Degradation: Important Role of Ferrate(IV) and Ferrate(V)

UVA-LED-Assisted Activation of the Ferrate(VI) Process for Enhanced Micropollutant Degradation: Important Role of Ferrate(IV) and Ferrate(V)

Characterization of Electromagnetic Catalysis and Degradation of Algogenic Odor Using Fe3O4 Nanoparticles with Tannin Coating

Geosmin reduction by algaecide application to drinking water: field scale efficacy and mechanistic insights

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Characterization of Electromagnetic Catalysis and Degradation of Algogenic Odor Using Fe₃O₄ Nanoparticles with Tannin Coating