Drinking water quality & health risk assessment of secondary water supply systems in residential neighborhoods

IF 6.1 2区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL
Yating Wei, Dong Hu, Chengsong Ye, Heng Zhang, Haoran Li, Xin Yu
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Abstract

Secondary water supply systems (SWSSs) are important components of the water supply infrastructure that ensure residents’ drinking water safety. SWSSs are characterized by long detention time, warm temperature, and unreasonable management, which may trigger the deterioration of water quality and increase risks. In this study, drinking water quality index (DWQI) and health risk assessment (HRA) were selected and modified to quantitatively assess the water quality and health risks of SWSSs in residential neighborhoods. In total, 121 seasonal water samples were selected. It was observed that the water quality was excellent with the DWQI of 0.14 ± 0.04, excluding one sample, which was extremely poor owing to its excessive total bacterial count. The HRA results revealed that the health risks were low: negligible non-carcinogenic risk for any population; negligible and acceptable carcinogenic risk for children aged 6–17 and adults. However, samples revealed higher carcinogenic risk (7.63 × 10−5 ± 3.29 × 10−6) for children aged 0–5, and arsenic was the major substance. Summer samples had poor water quality and higher health risks, which called for attention. To further investigate the water quality and health risks of SWSSs, monthly sampling was conducted during summer. All 24 water samples were qualified in Chinese standard (Gb 5749-2022) and characterized as excellent quality. Their HRA results were consistent with the seasonal samples’ and the health risks were mainly concentrated in May. Overall, our study provides a suitable framework for water quality security, advice for managers, and references for administrators in other cities.

Abstract Image

住宅二次供水系统饮用水水质与健康风险评价
二次供水系统是保障居民饮用水安全的供水基础设施的重要组成部分。swss具有滞留时间长、温度高、管理不合理等特点,可能引发水质恶化,增加风险。本研究采用饮用水水质指标(DWQI)和健康风险评价指标(HRA)进行修正,定量评价了居住小区swss的水质和健康风险。共选取了121个季节性水样。结果表明,除1个样品因细菌总数超标而极差外,水质优良,DWQI为0.14±0.04。HRA结果显示,健康风险很低:对任何人群的非致癌风险都可以忽略不计;对6-17岁儿童和成人的致癌风险可忽略不计和可接受。然而,样品显示0-5岁儿童的致癌风险较高(7.63 × 10−5±3.29 × 10−6),砷是主要物质。夏季样本水质较差,健康风险较高,值得关注。为进一步调查西南低水区的水质和健康风险,在夏季每月采样一次。24个水样均符合国家标准(Gb 5749-2022),水质优良。其HRA结果与季节样本一致,健康风险主要集中在5月份。总体而言,本研究为水质安全提供了一个合适的框架,为管理者提供了建议,并为其他城市的管理者提供了参考。
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来源期刊
Frontiers of Environmental Science & Engineering
Frontiers of Environmental Science & Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES
CiteScore
10.90
自引率
12.50%
发文量
988
审稿时长
6.1 months
期刊介绍: Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines. FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.
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