COMBI, continuous ozonation merged with biofiltration to study oxidative and microbial transformation of trace organic contaminants

Zoumpouli, Garyfalia A.; Scheurer, Marco; Brauch, Heinz‐Jürgen; Kasprzyk-Hordern, Barbara; Wenk, Jannis; Happel, Oliver

doi:10.1039/c8ew00855h

Cited by 12 publications

(9 citation statements)

References 89 publications

(105 reference statements)

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“…Ozone reacts primarily with organic compounds containing electron rich moieties such as C–C-double bonds and amines or aromatic rings ( David Yao and Haag 1991 ; Hermes et al., 2020 ; Lim et al., 2019 ; von Gunten 2018 ). However, the applied ozone doses typically not result in a complete mineralization of the organic MPs but rather to the formation of a multitude of TPs that are discharged into the environment ( Bourgin et al., 2018 ; Hermes et al., 2020 ; Merel and Zwiener 2016 ; Zoumpouli et al., 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Ozonation products of zidovudine and thymidine in oxidative water treatment

et al. 2021

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Ozonation is an advanced treatment technology that is increasingly used for the removal of organic micropollutants from wastewater and drinking water. However, reaction of organic compounds with ozone can also result in the formation of toxic transformation products. In the present study, the degradation of the antiviral drug zidovudine during ozonation was investigated. To obtain further insights into the reaction mechanisms and pathways, results of zidovudine were compared with the transformation of the naturally occurring derivative thymidine. Kinetic experiments were accompanied by elucidation of formed transformation products using lab-scale batch experiments and subsequent liquid chromatography – high resolution mass spectrometry (LC-HRMS) analysis. Degradation rate constants for zidovudine with ozone in the presence of t -BuOH as radical scavenger varied between 2.8 ∙ 10 4 M −1 s −1 (pH 7) and 3.2 ∙ 10 4 M −1 s −1 (pH 3). The structural difference of zidovudine to thymidine is the exchange of the OH-moiety by the azide function at position 3’. In contrast to inorganic azide, no reaction with ozone was observed for the organic bound azide. In total, nine transformation products (TPs) were identified for both zidovudine and thymidine. Their formation can be attributed to the attack of ozone at the C–C-double bond of the pyrimidine-base. As a result of rearrangements, the primary ozonide decomposed in three pathways forming two different TPs, including hydroperoxide TPs. Rearrangement reactions followed by hydrolysis and subsequent release of H 2 O 2 further revealed a cascade of TPs containing amide moieties. In addition, a formyl amide riboside and a urea riboside were identified as TPs indicating that oxidations of amide groups occur during ozonation processes.

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Section: Introductionmentioning

confidence: 99%

Ozonation products of zidovudine and thymidine in oxidative water treatment

et al. 2021

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“…The identification of the isomeric structure of each molecule is still far from any instrumental analytical realization [1]. The highest analytical resolution of DOM, which is the elemental composition of components, can be achieved by Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) [2][3][4][5]. Nevertheless with the high resolution attempts it can be possible to identify aquatic biogeochemical processes by investigating water samples as function of time and/or space.…”

Section: Introductionmentioning

confidence: 99%

Österreichs Mineral‐ und Heilwässer

Elster¹,

Fischer²,

Hann³

et al. 2021

Vom Wasser

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Natürliche Mineral‐ und Heilwässer sind Grundwässer mit besonderen chemisch‐ physikalischen Eigenschaften, die sich positiv auf den Organismus auswirken und bereits seit Jahrtausenden bekannt sind. Solche Wässer finden sowohl als wohltuende Getränke als auch in medizinischen Therapien breite Anwendung. Die besonderen Inhaltsstoffe sind von der Wechselwirkung des Wassers mit dem durchflossenen Gestein abhängig. Daraus ergeben sich einerseits die für die Balneologie erforderlichen Wirkungen und andererseits der spezielle Geschmack des Wassers.

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“…Some pollutants are even recalcitrant 66 to further degradation and may include their by-products as well 67 (Schlüter-Vorberg et al 2015 (Gerrity et al 2018). Zoumpouli et al (2019) studied the ozonationbiofilter combination of water treatment for five trace organic contaminants: acesulfame, carbamazepine, diclofenac, dimethylsulfamide, and fluoxetine. The complex transformed by-products from ozonation such as N-nitrosodimethylamine (NDMA) and an acesulfame product were removed from the biofilter while the recalcitrant oxidation products such as trifluoroacetic acid (TFA) and two products from diclofenac were removed partially.…”

Section: Introductionmentioning

confidence: 99%

Ozonation in Tandem with Biosand Filtration to Remove Microcystin-LR

2020

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A hybrid ozonation-biofiltration approach is evaluated to understand the necessity and concentration of ozone dose in removing the micropollutant microcystin-LR (MC-LR). To simulate real polluted water, three levels of natural organic matter-1, 2, and 5 mg=L-and cyanobloom intensity-low, medium, and high-under ozone exposure times-C1: 0.8 mg × min=L and C2: 1.6 mg × min=L-were studied (18 combinations in total). The feasibility of filter bioaugmentation (postozone treatment) using known MC-LR degraders Arthrobacter ramosus (Filter FA) and Bacillus sp. (Filter FB) is also discussed and compared with the feasibility of a noninoculated sand filter. Overall, the bioaugmented sand filters, FA and FB, enhanced filter performance by 19.5% and 10.5% for C1 samples and 6% and 2% for C2 samples, respectively, in terms of MC-LR removal. All three filters, including the control (FC), showed a negative correlation (FA: −0.987; FB: −0.973; FC: −0.977) between "residual ozone" and "MC-LR removal due to ozonation." However, A. ramosus (Filter FA) showed strong resilience toward the residual ozone (0.1-0.4 mg=L) and did not affect MC-LR removal due to filtration as much as it affected Filters FB and FC. Only Filter FA showed a significant difference (p-value: 0.047) between bloom condition and MC-LR removal that showed less removal of the latter at higher bloom intensity and vice versa. Statistical analysis, too, suggested a strong influence of natural organic matter (NOM) on filter performance for MC-LR removal. Also, protein phosphatase inhibition assay (PPIA) toxicity showed less toxic by-product formation when native bacteria were co-cultured and inoculated with A. ramosus and Bacillus sp.) in a sand filter. Hence, combined ozonation-biofilter treatment using co-inoculation may simplify (eco)toxicological and biotransformation research. This will enable the study of diverse contaminants under other environmental parameters.

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COMBI, continuous ozonation merged with biofiltration to study oxidative and microbial transformation of trace organic contaminants

Abstract: Investigating the biodegradation of ozonation products of trace organic contaminants is important to further elucidate their fate and to assess the efficiency of advanced water treatment processes.

Cited by 12 publications

References 89 publications

Ozonation products of zidovudine and thymidine in oxidative water treatment

Ozonation products of zidovudine and thymidine in oxidative water treatment

Österreichs Mineral‐ und Heilwässer

Ozonation in Tandem with Biosand Filtration to Remove Microcystin-LR

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