Unravelling relationships between fluorescence spectra, molecular weight distribution and hydrophobicity fraction of dissolved organic matter in municipal wastewater

Ji, Wen-Xiang; Tian, Ye-Chao; Li, Aimin; Gu, Xiaoming; Sun, Hongfang; Cai, Min-Hui; Shen, Shanqi; Zuo, Yan-Ting; Li, Wentao

doi:10.1016/j.chemosphere.2022.136359

Cited by 12 publications

(5 citation statements)

References 45 publications

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“…(1) It can provide specific information about the EDC values of DOM fractions with different MW ranges. (2) Multiple detectors can be coupled with the SEC column to enable a more comprehensive evaluation of DOM. , (3) SEC column separation can minimize the interference from inorganic matrix constituents (e.g., Fe 2+ , HS – , and I – ), thus improving the sensitivity and accuracy of EDC measurement.…”

Section: Evolution Of Edc Analytical Methodsmentioning

confidence: 99%

“…The reactivity of DOM with an oxidant is closely related to MW and hydrophobicity. ,, Figure c and Table S5 present the EDC values of different MW fractions (F1, F2, F3, F4, and F5) of natural organic matter (NOM) and wastewater treatment plant (WWTP) effluent organic matter (EfOM) as measured by the SEC method. , The aquatic NOM (i.e., DOM) isolates and EfOM exhibit a similar change trend, that is, the EDC decreases with decreasing MW fraction. It is important to highlight that the EDC values of EfOM obtained by the SEC method are relatively low, estimated to be ∼10% of the corresponding MW fractions of aquatic NOM.…”

Section: Effects Of the Characteristics Of Dom On Edc Analysismentioning

confidence: 97%

See 1 more Smart Citation

Electron Donating Capacity: A Promising Surrogate Indicator for the Optimization of Oxidative Water Treatments

Ji,

Dong,

Wang

et al. 2024

ACS EST Water

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The redox-active moieties of dissolved organic matter (DOM) significantly influence the degradation of pollutants in oxidative water treatments. Because electron donating capacity (EDC) directly probes the redox properties of DOM, it tends to be a promising surrogate indicator to reflect changes in the DOM oxidation state. Given the complexity of applying EDC to optimizing oxidation processes, this review summarizes a history of advances in EDC analytical methods and discusses key factors for the standardization of EDC measurement. The EDC and UV 254 reductions induced by chemical oxidation are summarized to develop tailored water treatment control strategies. In addition, the applicability of EDC to indicate micropollutant abatement and disinfection byproduct formation is evaluated. Oxidative water treatments with chlorine, chlorine dioxide, permanganate, and ferrate yield a more pronounced reduction in EDC than in UV 254 due to the formation of quinone moieties, while ozonation causes a comparatively smaller EDC reduction but a larger UV 254 reduction. For oxidative water treatments in which the oxidant dosage is difficult to predict, EDC could serve as a promising surrogate indicator to meet treatment goals.

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Section: Evolution Of Edc Analytical Methodsmentioning

confidence: 99%

Section: Effects Of the Characteristics Of Dom On Edc Analysismentioning

confidence: 97%

Electron Donating Capacity: A Promising Surrogate Indicator for the Optimization of Oxidative Water Treatments

Ji,

Dong,

Wang

et al. 2024

ACS EST Water

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“…COD in water has strong fluorescence characteristics and UV-Vis absorption characteristics [10]. Furthermore, these two technologies have been affirmed as valuable tools by many researchers for characterizing and monitoring the changes of organic matter in sewage [11][12].…”

Section: Introductionmentioning

confidence: 99%

Fast Tracking and Detection of Organic Matter in an Urban Sewage Treatment Plant Using Fluorescence Spectroscopy and UV-Vis Absorption Spectroscopy

Chen,

Zhu,

Zhao

et al. 2024

Preprint

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In this study, organic matter distributions and concentrations at various stages of an urban wastewater treatment plant in Hefei, Eastern China, were analyzed from November 2022 to June 2023 using UV-Vis absorption and three-dimensional fluorescence spectroscopy. Six components identified via excitation-emission matrix and PARAFAC analysis revealed that components related to tryptophan (components 1, 3, and 6) had strong correlations with COD concentrations, with Pearson correlation coefficients of 0.656, 0.447, and 0.674, respectively. Analysis of fluorescence and UV-Vis absorption parameters indicated a reduction in organic matter content, increased humification, and a shift from exogenous to endogenous organic substances throughout the sewage treatment process. Notably, the humification index showed the highest correlation with COD levels (-0.834). On this basis, Utilizing Monte Carlo-Uninformative Variable Elimination-Partial Least Squares (MC-UVE-PLS) for characteristic wavelength extraction from normalized fluorescence and absorption spectra, a COD characteristic fusion spectral analysis model was developed. The results show that there is a good agreement between COD concentrations obtained based on feature fusion spectral analysis and COD true values obtained by the potassium dichromate method. The coefficient of determination between COD predicted values and the true values in the testing set reached 0.9725, and the root mean square error was only 10.51 mg/L. These findings suggest the efficacy of using UV-Vis absorption and three-dimensional fluorescence spectroscopy for direct COD tracking and detection in wastewater treatment processes without any pretreatment.

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“…The factors affecting Cu(II) binding in specific ecosystems ought to be confined to the inherent properties of dissolved organic matter (DOM), although the pH and ionic strength can also affect binding processes. , Therefore, the composition and sources of COM in algae-laden water are the major factors affecting binding behaviors. , Several organic functional groups, such as amide, carboxyl, phenol, quinone, and hydroxyl groups, in COM can act as active sites for metal binding via chelation or complexation, although carboxylic and phenolic groups are generally recognized as the dominant metal-binding sites. , …”

Section: Introductionmentioning

confidence: 99%

“…13,14 Several organic functional groups, such as amide, carboxyl, phenol, quinone, and hydroxyl groups, in COM can act as active sites for metal binding via chelation or complexation, although carboxylic and phenolic groups are generally recognized as the dominant metal-binding sites. 15,16 Approaches for studying the metal-binding characteristics of organic ligands are diverse. 17−19 Many spectroscopic methods have been used to explore metal−ligand interactions, 19,20 and studies employing these techniques have provided new insights into the conformation of organics at the molecular scale.…”

Section: ■ Introductionmentioning

confidence: 99%

Complexation of Copper Algicide and Cellular Organic Matter: Implications for Its Fate in Algae-Laden Surface Waters

et al. 2023

ACS EST Water

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Copper-based algicides have been widely used to suppress cyanobacterial biomass. Constrained by the heterogeneous characteristics of cellular organic matter (COM) in aquatic ecosystems, little information on the Cu(II) binding of different COM subfractions has been obtained. In this study, the original COM solution was divided into four fractions, the hydrophobic (HPO), transphilic (TPI), charged hydrophilic (CHPI), and neutral hydrophilic (NHPI) fractions, via resin-mediated fractionation. A comprehensive methodology that integrates two-dimensional correlation spectroscopy (2DCoS), hetero-2DCoS, and moving-window 2DCoS analysis was used to identify the binding sites and binding sequence of COM subfractions in response to Cu(II) perturbation. The most sensitive groups in the HPO, TPI, CHPI, and NHPI fractions were aryl υC–H, aliphatic δC–H, amide II υC–N, and polysaccharide νC–O, respectively. Each subfraction could interact with Cu(II) through diverse functional moieties, and carboxylic, aliphatic, aryl, and phenolic groups were the basic units of COM chromophores. The functional groups could coordinate with Cu(II) when it was present at both trace and high concentrations, but the abundance of functional groups varied significantly among COM subfractions and even chromophores. These findings enhance our understanding of the molecular characteristics of Cu(II) complexes and the environmental fates of metal–organic complexes in aquatic systems.

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Unravelling relationships between fluorescence spectra, molecular weight distribution and hydrophobicity fraction of dissolved organic matter in municipal wastewater

Cited by 12 publications

References 45 publications

Electron Donating Capacity: A Promising Surrogate Indicator for the Optimization of Oxidative Water Treatments

Electron Donating Capacity: A Promising Surrogate Indicator for the Optimization of Oxidative Water Treatments

Fast Tracking and Detection of Organic Matter in an Urban Sewage Treatment Plant Using Fluorescence Spectroscopy and UV-Vis Absorption Spectroscopy

Complexation of Copper Algicide and Cellular Organic Matter: Implications for Its Fate in Algae-Laden Surface Waters

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