Characteristics of Dissolved Organic Matter in Raw Water in the Ogasawara Islands and their Variation in Water Treatment Plants

Abstract This research focuses on characterizing the dissolved organic matter found at water treatment plants with closed systems. Recycled water generated as a by-product of water treatment is added to raw water in those systems. The dissolved organic matter in the raw water was found to be higher in summer than in winter, but the water treatment process was able to produce purified water of the similar quality in both seasons. The recycled water contained mostly low molecular weight and protein-like substances, and this composition was different from that of the raw water, which mainly contained humic-like substances. The recycled water did not influence the concentration of humic-like substances or the molecular weight distribution in the influent water.

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Exploring the relative changes in dissolved organic matter for assessing the water quality of full-scale drinking water treatment plants using a fluorescence ratio approach

Water Research ◽

10.1016/j.watres.2020.116125 ◽

2020 ◽

Vol 183 ◽

pp. 116125 ◽

Cited By ~ 1

Author(s):

Tahir Maqbool ◽

Yanling Qin ◽

Quang Viet Ly ◽

Jiaxing Zhang ◽

Chengyue Li ◽

...

Keyword(s):

Water Quality ◽

Drinking Water ◽

Organic Matter ◽

Water Treatment ◽

Dissolved Organic Matter ◽

Drinking Water Treatment ◽

Fluorescence Ratio ◽

Water Treatment Plants ◽

Ratio Approach

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Characteristics of dissolved organic matter in a water purification plant and distribution pipes

MATEC Web of Conferences ◽

10.1051/matecconf/201928003007 ◽

2019 ◽

Vol 280 ◽

pp. 03007 ◽

Cited By ~ 1

Author(s):

Toshiro Yamada ◽

Maulana Yusup Rosadi ◽

Hudori ◽

Yukitaka Suzuki ◽

Eri Ito ◽

...

Keyword(s):

Molecular Weight ◽

Organic Matter ◽

Water Treatment ◽

Dissolved Organic Matter ◽

Three Dimensional ◽

Quality Parameters ◽

Raw Water ◽

Treatment Unit ◽

Treatment Processes ◽

Doc Concentration

Dissolved organic matter (DOM) needs to be characterized todetermine the ability of a water treatment unit to reduce organic matter andits relationship to the levels of chlorine required for disinfection. Weinvestigated water quality parameters, including DOM, in a waterpurification plant and distribution pipes located in central Japan. Thedissolved organic carbon (DOC) concentration decreased from 0.73 mg/Lin raw water to 0.50 mg/L in purified water by conventional treatmentprocesses. The DOC of purified water decreased slightly in the pipesdownstream of the plant. The three-dimensional excitation-emission matrixfluorescence spectra showed some specific peaks for humic-like substancesand protein-like substances in all water samples, and the compositions ofDOM in purified water were close to those in raw water. However, therewas a peak of protein-like substances in purified and returned water, whichwas not observed for raw water. The fluorescence intensities of humic-likesubstances in purified water decreased downstream of the plant, while thefluorescence intensities of protein-like substances increased in the pipes. The measured molecular weight distributions of DOM in water presentedsome specific peaks, and DOM with a smaller molecular weight was noteasily removed by water treatment processes. There were positiverelationships between decreases in the intensities of some peaks andresidual chlorine decay.

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Natural organic matter fractionation along the treatment of water for human consumption

Global NEST Journal ◽

10.30955/gnj.000828 ◽

2013 ◽

Vol 14 (4) ◽

pp. 399-406

Keyword(s):

Organic Matter ◽

Seasonal Variation ◽

Water Treatment ◽

Dissolved Organic Matter ◽

Natural Organic Matter ◽

Treatment Plant ◽

Human Consumption ◽

Raw Water ◽

Organic Matter Fractionation ◽

Hydrophobic Acids

The main objective of this study was to characterize the organic matter present in raw water and along the treatment process, as well as its seasonal variation. A natural organic matter fractionation approach has been applied to Lever water treatment plant located in Douro River, in Oporto (Portugal). The process used was based on the sorption of dissolved organic matter in different types of ion exchange resins, DAX-8, DAX-4 and IRA-958, allowing its separation into four fractions: very hydrophobic acids (VHA), slightly hydrophobic acids (SHA), charged hydrophilic (CHA) and hydrophilic neutral (NEU). The dissolved organic carbon (DOC) determination was used to quantify dissolved organic matter. Samples were collected monthly, during approximately one year, from raw water captured at the surface and under the bed of the river, and after each step of the treatment: pre-filtration in sand/anthracite filters, ozonation, coagulation/flocculation, counter current dissolved air flotation and filtration (CoCoDAFF) and chlorination. The NEU fraction showed a seasonal variation, with maximum values in autumn for the sampling points corresponding to raw water captured at the surface and under the bed of the river. It was usually the predominating fraction and did not show a significant decrease throughout the treatment. Nevertheless their low concentration, the same occurred for the CHA and VHA fractions. There was an overall decrease in the SHA fraction throughout the water treatment (especially after CoCoDAFF and ozonation) as well as in the DOC. The TSUVA254 values obtained for raw water generally varied between 2.0 and 4.0 L mgC-1 m-1 and between 0.75 and 1.78 L mgC-1 m-1 for treated water. It was observed a decrease of TSUVA values along the treatment, especially after ozonation. These results may contribute to a further optimization in the process of treating water for human consumption.

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Tracking changes in composition and amount of dissolved organic matter throughout drinking water treatment plants by comprehensive two-dimensional gas chromatography–quadrupole mass spectrometry

The Science of The Total Environment ◽

10.1016/j.scitotenv.2017.07.147 ◽

2017 ◽

Vol 609 ◽

pp. 123-131 ◽

Cited By ~ 10

Author(s):

Chunmei Li ◽

Donghong Wang ◽

Xiong Xu ◽

Meijia Xu ◽

Zijian Wang ◽

...

Keyword(s):

Mass Spectrometry ◽

Gas Chromatography ◽

Drinking Water ◽

Organic Matter ◽

Water Treatment ◽

Dissolved Organic Matter ◽

Drinking Water Treatment ◽

Two Dimensional ◽

Quadrupole Mass ◽

Water Treatment Plants

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Using excitation-emission matrix fluorescence to evaluate the performance of water treatment plants for dissolved organic matter removal

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy ◽

10.1016/j.saa.2020.119298 ◽

2021 ◽

Vol 249 ◽

pp. 119298

Author(s):

Francisco J. Rodríguez-Vidal ◽

María García-Valverde ◽

Beatriz Ortega-Azabache ◽

Ángela González-Martínez ◽

Ana Bellido-Fernández

Keyword(s):

Organic Matter ◽

Water Treatment ◽

Dissolved Organic Matter ◽

Organic Matter Removal ◽

Excitation Emission Matrix ◽

Water Treatment Plants

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Dissolved organic matter modified magnetic carbon nanotubes enhance the bioremediation of azo dyes and Cr(vi)

Environmental Science Water Research & Technology ◽

10.1039/c9ew00965e ◽

2020 ◽

Vol 6 (7) ◽

pp. 1804-1815

Author(s):

Caiwen He ◽

Lipeng Gu ◽

Huan He ◽

Zhe Zhang ◽

Xiaoxia Wang ◽

...

Keyword(s):

Carbon Nanotubes ◽

Organic Matter ◽

Water Treatment ◽

Dissolved Organic Matter ◽

Azo Dyes ◽

Electron Shuttles ◽

Magnetic Carbon ◽

Magnetic Carbon Nanotubes

Dissolved organic matter and Fe(iii) species can serve as electron shuttles in the bioreduction of various pollutants in water treatment, but their residuals are also regarded as contaminants.

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