Identification of dissolved organic matter in raw water supply from reservoirs and canals as precursors to trihalomethanes formation

The present research aims to examine the coagulation process enhancement for dissolved organic matter (DOM) and The present research aims to examine the coagulation process enhancement for dissolved organic matter (DOM) and trihalomethane formatation potential (THMFP) removal from a raw water supply with low turbidity and specific ultraviolet absorption (SUVA). Coagulation conditions were optimized using polyaluminum chloride (PACl), PACl with dry cationic polymer (polymer), and PACl with polymer and powder activated carbon (PAC). DOM was measured in terms of dissolved organic carbon (DOC) and ultraviolet absorption at a wavelength of 254 nm (UV-254). Results show that the optimal condition for PACl, PACl and polymer, and PACl with polymer and PAC coagulation were PACl 20 mg/L at pH 7, PACl 20 mg/L and polymer 0·1 mg/L, and PACl 20 mg/L with polymer 0·1 mg/L and PAC 10 mg/L, respectively. When the DOM contents in coagulated water were fractioned to be hydrophilic (HPI) and hydrophobic (HPO) groups, it was found that the coagulation process could effectively remove more DOC of HPO than DOC of HPI. The coagulation using PACl combined with polymer and PAC provided the highest level of DOC of HPI, DOC of HPO, Trihalomethane formation potential (THMFP) of HPI, and THMFP of HPO removal efficiencies and were shown to be 65%, 75%, 77%, and 79%, respectively.

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Characterization of dissolved organic matter and disinfection characteristics of source water from the Pearl River

Water Science & Technology Water Supply ◽

10.2166/ws.2007.055 ◽

2007 ◽

Vol 7 (2) ◽

pp. 205-212

Author(s):

Z.Y. Zhao ◽

J.D. Gu ◽

H.B. Li

Keyword(s):

Organic Matter ◽

Dissolved Organic Matter ◽

Chlorine Dioxide ◽

Anthropogenic Activities ◽

Apparent Molecular Weight ◽

Water Disinfection ◽

Size Exclusion ◽

Pearl River ◽

Source Water ◽

Raw Water

Source water samples were collected from Guangzhou segment of Pearl River and filtered through Amicon® YC-05, YM-1, YM-3, YM-10, YM-30, YM-100 and ZM-500 membranes sequentially after pre-treatment. The apparent molecular weights of the 8 fractions were calibrated using high-performance size exclusion chromatograph (HPSEC) and they ranged from 0.36 to 182.6 kDa. These fractionated isolates and the raw water were disinfected by chlorine or chlorine dioxide to determine their disinfection characteristics. Results showed that apparent molecular weight of the main dissolved organic matter (DOM) in the RO isolate of water sample was less than 360 Da and this part of the DOM was mainly from anthropogenic activities and contamination of wastewater. RO fraction was the controlling factor for the raw water disinfection process according to the THMs concentrations detected. Disinfection by chlorine dioxide produced less THMs that by chlorine.

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Characterization of dissolved organic matter at a water treatment plant with closed systems in different seasons

Water Science & Technology Water Supply ◽

10.2166/ws.2020.117 ◽

2020 ◽

Vol 20 (5) ◽

pp. 2013-2020

Author(s):

Hudori Hudori ◽

Toshiro Yamada ◽

Yukitaka Suzuki ◽

Maulana Yusup Rosadi ◽

Hiroto Tamaoki ◽

...

Keyword(s):

Molecular Weight ◽

Organic Matter ◽

Water Treatment ◽

Dissolved Organic Matter ◽

Treatment Plant ◽

Water Treatment Plant ◽

Raw Water ◽

Recycled Water ◽

Water Treatment Process ◽

Closed Systems

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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Will UK peatland restoration reduce dissolved organic matter concentrations in upland drinking water supplies?

10.5194/hess-2020-450 ◽

2020 ◽

Author(s):

Jennifer Williamson ◽

Christopher Evans ◽

Bryan Spears ◽

Amy Pickard ◽

Pippa J. Chapman ◽

...

Keyword(s):

Drinking Water ◽

Organic Matter ◽

Dissolved Organic Matter ◽

Field Studies ◽

Organic Soils ◽

Catchment Management ◽

Raw Water ◽

Considerable Uncertainty ◽

Published Evidence ◽

Peatland Restoration

Abstract. Rising dissolved organic matter (DOM) concentrations, and associated increases in water colour, have posed a potential problem for the UK water industry since the phenomenon was first reported in the early 1990s. Elevated DOM concentrations in raw water are of particular concern in upland catchments dominated by organic soils where DOM production tends to be highest. In recent years, water companies have considered the capacity for catchment interventions to improve raw water quality at source, relieving the need for costly and complex engineering solutions in treatment works, but there is considerable uncertainty around the effectiveness of these measures. One of the primary evidence gaps is the extent to which catchment management is capable of influencing DOM concentrations at the point of abstraction, field studies rarely extending beyond sub-catchment or stream scale. Our review of the published evidence suggests that catchment management could make a contribution to mitigating recent DOM increases in some circumstances, particularly where plantation forestry has been grown on peat, and where control of nutrients in runoff could reduce in-reservoir DOM production. Evidence for the efficacy of most other measures that target reductions in DOM loading for catchment to reservoir remains insufficient to support wider scale application. Collectively, these measures have the potential to reduce DOM concentrations in drinking water reservoirs but they must be selected on a site-specific basis, where the scale, effect size and duration of the catchment intervention are considered in relation to both the treatment capacity of the works and future projected DOM trends.

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Non-target screening of dissolved organic matter in raw water, coagulated water, and chlorinated water by Orbitrap mass spectrometry

Chemosphere ◽

10.1016/j.chemosphere.2020.128437 ◽

2021 ◽

Vol 264 ◽

pp. 128437 ◽

Cited By ~ 1

Author(s):

Warangkana Na Phatthalung ◽

Oramas Suttinun ◽

Phanwatt Phungsai ◽

Ikuro Kasuga ◽

Futoshi Kurisu ◽

...

Keyword(s):

Mass Spectrometry ◽

Organic Matter ◽

Dissolved Organic Matter ◽

Raw Water ◽

Orbitrap Mass Spectrometry ◽

Target Screening

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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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Evaluation of DBPs Formation Potential during Chlorination of Dissolved Organic Matter Fractions Isolated from Eutrophic Water

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.157-158.1680 ◽

2012 ◽

Vol 157-158 ◽

pp. 1680-1684

Author(s):

Jin Hong Luo ◽

Bing Hui Zheng ◽

Qing Fu ◽

Xing Ru Zhao ◽

Yan Liu ◽

...

Keyword(s):

Organic Matter ◽

Dissolved Organic Matter ◽

Contact Time ◽

Trichloroacetic Acid ◽

Water Source ◽

Haloacetic Acids ◽

Raw Water ◽

Eutrophic Water ◽

Organic Matter Fractions ◽

Hydrophobic Acids

Dissolved organic matter (DOM) in water from eutrophic water source was isolated into four classes as hydrophilic substances (HIS), hydrophobic acids (HOA), hydrophobic neutrals (HON), and hydrophobic bases (HOB). The formation of Trihalomethanes (THMs) and Haloacetic acids (HAAs) in chlorination of different DOM fractions was evaluated. The dominate species of THMs and HAAs were chloroform (CF) and trichloroacetic acid (TCAA) in the chlorination of raw water. There were close linear relationship between THMs/HAAs yields and SUVA254 values. Increasing of contact time and chlorine dosage enhanced the formation of THMs/HAAs yields from different DOM fractions. The increase of pH leads to more formation of THMs, and the highest production of HAAs was observed at pH 7.

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