Unraveling dissolved organic matter in drinking water through integrated ozonation/ceramic membrane and biological activated carbon process using FT-ICR MS

Hou, Congyu; Chen, Li; Dong, Yafei; Yang, Yulong; Zhang, Xihui

doi:10.1016/j.watres.2022.118881

Cited by 37 publications

(12 citation statements)

References 52 publications

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“…Therefore, this study investigates the effect of different ions (e.g., Cl -, SO4 2-, HCO3 -, PO4 3-, and NO3 -) and humic acid (HA) on the degradation of RB19. Consequently, the degradation rate of RB19 reaches 93.98% and 93.88%, with a slight enhancing effect, consistent with the finds of previous study Li et al [45] As the concentration of Clincreased to 10 or 100mM, the excess Clfurther promote reactions (6)(7)(8)(9)(10)(11)(12). So the •OH concentration decreased at this time Cl2…”

Section: 22effect Of Inorganic Ions and Natural Organic Mattersupporting

confidence: 90%

Degradation of Anthraquinone Dye Wastewater by Sodium Percarbonate with CoO Heterogeneous Activation

Fan,

Xia,

Sun

et al. 2024

Preprint

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In this work, the optimal efficiency and mechanism of action of CoO activated sodium percarbonate (SPC) for the degradation of Reactive Blue 19 was investigated. The three-factor interaction of SPC concentration, CoO dosage and initial pH and the effects of factors such as anions and humic acids (HA) were investigated. The results show that the CoO/SPC system (93.8%, 0.01015 min− 1) efficiently degraded RB19 and was also suitable for other organic dyes (32.7%~100%) and antibiotics (97.1%~100%). During the activation of SPC by CoO, carbonate radical (CO3•−), hydroxyl radical (•OH), superoxide radical (O2•−) and singlet oxygen (1O2) are involved in the degradation process, among which CO3•− (88.2%) plays an indispensable role, which was proved by quenching experiments and electron paramagnetic resonance (EPR) tests. Co2+ dissolution was lower than 150 µg/L, which meets the emission standard (1 ppm); the application of SPC avoids the problem of acidification of the wastewater, and the final product is green in color. This study presents a novel approach to treating dye wastewater by combining transition metal oxides with sodium percarbonate.

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Section: 22effect Of Inorganic Ions and Natural Organic Mattersupporting

confidence: 90%

Degradation of Anthraquinone Dye Wastewater by Sodium Percarbonate with CoO Heterogeneous Activation

Fan,

Xia,

Sun

et al. 2024

Preprint

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“…Based on the peak intensity reduction ratio (Δ P ) of a formula, calculated by the intensity acquired in the ozo-irradiated sample divided by that in ozonated sample then minus 1, five groups were arranged where a formula showed increased or decreased intensity more than 30% was regarded as one of the increased group or the decreased group, respectively. – Those that changed by less than 30% were sorted into unchanged groups. Moreover, formulas marked as formed or removed appeared or did not exist in the irradiated water sample.…”

Section: Results and Discussionmentioning

confidence: 99%

Phototransformation of Brominated Disinfection Byproducts and Toxicity Elimination in Sunlit-Ozonated Reclaimed Water

Wu,

Lu,

et al. 2023

Environ. Sci. Technol.

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Ozonation is universally used during water treatment but can form hazardous brominated disinfection byproducts (Br-DBPs). While sunlight exposure is advised to reduce the risk of Br-DBPs, their phototransformation pathways remain insufficiently understood. Here, sunlight irradiation was found to reduce adsorbable organic bromine by 63%. Applying high-resolution mass spectrometry, the study investigated transformations of dissolved organic matter in sunlit-ozonated reclaimed water, revealing the number and abundance of assigned formulas decreased after irradiation. The Br-DBPs with O/C < 0.6 and MW > 400 Da were decreased or removed after irradiation, with the majority being CHOBr compounds. The peak intensity reduction ratio of CHOBr compounds correlated positively with double bound equivalent minus oxygen ratios but negatively with O/C, suggesting that photo-susceptible CHOBr compounds were highly unsaturated. Mass difference analysis revealed that the photodegradation pathways were mainly oxidation aligned with debromination. Three typical CHOBr molecular structures were resolved, and their photoproducts were proposed. Toxicity estimates indicated decreased toxicity in these photoproducts compared to their parent compounds, in line with experimentally determined values. Our proposed phototransformation pathways for Br-DBPs enhance our comprehension of their degradation and irradiation-induced toxicity reduction in reclaimed water, further illuminating their transformation under sunlight in widespread environmental scenarios.

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“…Generally, the reduced number of molecules of different components of DOM after coagulation, also shows that coagulation is relatively more selective for DOM. For example, the total number of DOM molecules in surface water was reduced by 65.0% after coagulation (Hou et al, 2022), while DOM molecules in river water were reduced by 18.4% after coagulation (Wang, Jia, et al, 2023). Most of the molecules removed by coagulation consisted of CHO and CHON, proteins/lipids, condensed aromatic structures, and lignins.…”

Section: Spectral Indexmentioning

confidence: 99%

Purification of dredged water by magnetic coagulation: Response surface optimization and dissolved organic matter removal characteristics

Xiao,

Feng,

Zhang

et al. 2024

Water Environment Research

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In the present study, magnetic coagulation was used to treat dredged water and the response surface method was used to optimize process parameters. The dissolved organic matter (DOM) removal characteristics were characterized by three‐dimensional fluorescence spectrometry and ultra‐high resolution mass spectrometry. During the magnetic coagulation process, the suspended solids (SS) removal rate increased initially and then decreased under conditions of increasing magnetic powder dosage and stirring rate. After magnetic coagulation and precipitation for 20 min, the contents of SS, ammonia nitrogen, chemical oxygen demand, and total phosphorus in the treated dredged water met the requirements of the discharge standard (GB8978–1996, China). Three‐dimensional fluorescence results showed that magnetic coagulation selectively removed fulvic acids and humic acid substances. After magnetic coagulation with precipitation for 10 min and 20 min, the total relative content of lignins, tannins, proteins, lipids, aminosugars, unsaturated hydrocarbons, condensed aromatic structures, and carbohydrates decreased by 26.3% and 39.4%, respectively. After magnetic coagulation, the distribution range of small molecule DOM shifted to the low H/C and high O/C regions. This study provides a novel perspective for studies on the removal of DOM in dredged water by magnetic coagulation.Practitioner Points SS and DOM removal were significantly enhanced by the use of magnetic coagulation. SS removal efficiency was affected by stirring rate and magnetic powder dosage. Magnetic coagulation selectively removed fulvic acids and humic acid substances. DOM molecule shifted to low H/C and high O/C regions after magnetic coagulation.

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Unraveling dissolved organic matter in drinking water through integrated ozonation/ceramic membrane and biological activated carbon process using FT-ICR MS

Cited by 37 publications

References 52 publications

Degradation of Anthraquinone Dye Wastewater by Sodium Percarbonate with CoO Heterogeneous Activation

Degradation of Anthraquinone Dye Wastewater by Sodium Percarbonate with CoO Heterogeneous Activation

Phototransformation of Brominated Disinfection Byproducts and Toxicity Elimination in Sunlit-Ozonated Reclaimed Water

Purification of dredged water by magnetic coagulation: Response surface optimization and dissolved organic matter removal characteristics

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