Size and resin fractionations of dissolved organic matter and characteristics of disinfection by-product precursors in a pilot-scale constructed wetland

Size and resin fractionations of dissolved organic matter and characteristics of disinfection by-product precursors in a pilot-scale constructed wetland

Controlling the formation of disinfection by-products (DBPs) is a major issue in the drinking water industry, and understanding the characteristics of DBP precursors in treatment processes for micro-polluted raw water is key to improving water quality. In this study, a sampling program was undertake...

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Autores principales: Jiachang Pi, Guangcan Zhu, Lianqing Liu, Chuya Wang, Zhonglian Yang
Formato: article
Lenguaje:EN
Publicado: IWA Publishing 2021
Materias:
disinfection by-product precursors
dissolved organic matter (dom)
hydrophobic/hydrophilic
micro-polluted raw water
molecular weight
Water supply for domestic and industrial purposes
TD201-500
River, lake, and water-supply engineering (General)
TC401-506
Acceso en línea:https://doaj.org/article/3cd323cebbf747bba1aa5e1703b91492
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spelling oai:doaj.org-article:3cd323cebbf747bba1aa5e1703b914922021-11-06T07:14:58ZSize and resin fractionations of dissolved organic matter and characteristics of disinfection by-product precursors in a pilot-scale constructed wetland1606-97491607-079810.2166/ws.2021.013https://doaj.org/article/3cd323cebbf747bba1aa5e1703b914922021-06-01T00:00:00Zhttp://ws.iwaponline.com/content/21/4/1481https://doaj.org/toc/1606-9749https://doaj.org/toc/1607-0798Controlling the formation of disinfection by-products (DBPs) is a major issue in the drinking water industry, and understanding the characteristics of DBP precursors in treatment processes for micro-polluted raw water is key to improving water quality. In this study, a sampling program was undertaken to investigate the fate of dissolved organic matter (DOM) and the characteristics of DBP precursors in a pilot constructed wetland imitating the Yanlong Lake ecological project. Using XAD resin adsorption and ultrafiltration techniques, the dissolved organic carbon, UV254, and DBP formation potential (DBPFP) were measured in different DOM fractions in raw water and wetland effluents. After the constructed wetland treatment, the low molecular weight fraction (<3 kDa) of DOM and DBPFP generally showed a decreasing trend along the water path, while the high molecular weight fraction (>3 kDa) of DOM increased. The specific DBPFP (SDBPFP) was much higher in the <1 kDa fraction than in the other fractions. Although the hydrophobic fraction of DOM was the most abundant in all stages of the wetland treatment, the SDBPFP of the hydrophilic fraction was higher than that of the hydrophobic fraction. Furthermore, compared with raw water, the DOC, UV254 and DBPFP in the treated wetland effluents increased; however, all of the chemical DOM fractions exhibited decreased SDBPFP in accordance with a decrease in the specific ultraviolet absorbance during wetland treatment. These conclusions indicate that the DOM produced by the wetland system may generate DBPs less readily compared with the DOM of raw water. HIGHLIGHTS The constructed wetland system of water source area would reduce small molecular weight DOM but increase large molecular weight DOM.; The chemical fraction of SUVA and SDBPFP decreased along the wetlands treatment path.; DOM produced by the wetland system may generate DBPs less readily compared with the DOM of raw water.;Jiachang PiGuangcan ZhuLianqing LiuChuya WangZhonglian YangIWA Publishingarticledisinfection by-product precursorsdissolved organic matter (dom)hydrophobic/hydrophilicmicro-polluted raw watermolecular weightWater supply for domestic and industrial purposesTD201-500River, lake, and water-supply engineering (General)TC401-506ENWater Supply, Vol 21, Iss 4, Pp 1481-1494 (2021)
institution DOAJ
collection DOAJ
language EN
topic disinfection by-product precursors
dissolved organic matter (dom)
hydrophobic/hydrophilic
micro-polluted raw water
molecular weight
Water supply for domestic and industrial purposes
TD201-500
River, lake, and water-supply engineering (General)
TC401-506
spellingShingle disinfection by-product precursors
dissolved organic matter (dom)
hydrophobic/hydrophilic
micro-polluted raw water
molecular weight
Water supply for domestic and industrial purposes
TD201-500
River, lake, and water-supply engineering (General)
TC401-506
Jiachang Pi
Guangcan Zhu
Lianqing Liu
Chuya Wang
Zhonglian Yang
Size and resin fractionations of dissolved organic matter and characteristics of disinfection by-product precursors in a pilot-scale constructed wetland
description Controlling the formation of disinfection by-products (DBPs) is a major issue in the drinking water industry, and understanding the characteristics of DBP precursors in treatment processes for micro-polluted raw water is key to improving water quality. In this study, a sampling program was undertaken to investigate the fate of dissolved organic matter (DOM) and the characteristics of DBP precursors in a pilot constructed wetland imitating the Yanlong Lake ecological project. Using XAD resin adsorption and ultrafiltration techniques, the dissolved organic carbon, UV254, and DBP formation potential (DBPFP) were measured in different DOM fractions in raw water and wetland effluents. After the constructed wetland treatment, the low molecular weight fraction (<3 kDa) of DOM and DBPFP generally showed a decreasing trend along the water path, while the high molecular weight fraction (>3 kDa) of DOM increased. The specific DBPFP (SDBPFP) was much higher in the <1 kDa fraction than in the other fractions. Although the hydrophobic fraction of DOM was the most abundant in all stages of the wetland treatment, the SDBPFP of the hydrophilic fraction was higher than that of the hydrophobic fraction. Furthermore, compared with raw water, the DOC, UV254 and DBPFP in the treated wetland effluents increased; however, all of the chemical DOM fractions exhibited decreased SDBPFP in accordance with a decrease in the specific ultraviolet absorbance during wetland treatment. These conclusions indicate that the DOM produced by the wetland system may generate DBPs less readily compared with the DOM of raw water. HIGHLIGHTS The constructed wetland system of water source area would reduce small molecular weight DOM but increase large molecular weight DOM.; The chemical fraction of SUVA and SDBPFP decreased along the wetlands treatment path.; DOM produced by the wetland system may generate DBPs less readily compared with the DOM of raw water.;
format article
author Jiachang Pi
Guangcan Zhu
Lianqing Liu
Chuya Wang
Zhonglian Yang
author_facet Jiachang Pi
Guangcan Zhu
Lianqing Liu
Chuya Wang
Zhonglian Yang
author_sort Jiachang Pi
title Size and resin fractionations of dissolved organic matter and characteristics of disinfection by-product precursors in a pilot-scale constructed wetland
title_short Size and resin fractionations of dissolved organic matter and characteristics of disinfection by-product precursors in a pilot-scale constructed wetland
title_full Size and resin fractionations of dissolved organic matter and characteristics of disinfection by-product precursors in a pilot-scale constructed wetland
title_fullStr Size and resin fractionations of dissolved organic matter and characteristics of disinfection by-product precursors in a pilot-scale constructed wetland
title_full_unstemmed Size and resin fractionations of dissolved organic matter and characteristics of disinfection by-product precursors in a pilot-scale constructed wetland
title_sort size and resin fractionations of dissolved organic matter and characteristics of disinfection by-product precursors in a pilot-scale constructed wetland
publisher IWA Publishing
publishDate 2021
url https://doaj.org/article/3cd323cebbf747bba1aa5e1703b91492
work_keys_str_mv AT jiachangpi sizeandresinfractionationsofdissolvedorganicmatterandcharacteristicsofdisinfectionbyproductprecursorsinapilotscaleconstructedwetland
AT guangcanzhu sizeandresinfractionationsofdissolvedorganicmatterandcharacteristicsofdisinfectionbyproductprecursorsinapilotscaleconstructedwetland
AT lianqingliu sizeandresinfractionationsofdissolvedorganicmatterandcharacteristicsofdisinfectionbyproductprecursorsinapilotscaleconstructedwetland
AT chuyawang sizeandresinfractionationsofdissolvedorganicmatterandcharacteristicsofdisinfectionbyproductprecursorsinapilotscaleconstructedwetland
AT zhonglianyang sizeandresinfractionationsofdissolvedorganicmatterandcharacteristicsofdisinfectionbyproductprecursorsinapilotscaleconstructedwetland
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