Risk assessment of heavy metals in pipe scales and loose deposits formed in drinking water distribution systems
Risk assessment of heavy metals in pipe scales and loose deposits formed in drinking water distribution systems
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饮用水分配系统中形成的管垢和松散沉积物中重金属的风险评估
DOI：
10.1016/j.scitotenv.2018.10.347
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发表时间：
2019
影响因子：
9.8
通讯作者：
Shi Baoyou
中科院分区：
文献类型：
--
作者：
Gao Jiali;Liu Quanli;Song Laizhou;Shi Baoyou
无机污染物在给水管网中的累积会严重威胁水质和安全。这项工作主要集中在DWDS的管垢和松散沉积物中发现的无机污染物的积累，形态和风险评估。采用全球污染因子（GCF）、风险评估准则（RAC）和基于共识的沉积物质量指南（CBSQG）对无机污染物的潜在健康风险进行评价。采用Tessier连续提取法研究了真实的DWDS中14个样品（6个管垢样品，8个松散存款样品）中无机污染物的形态分布。Al和Mn之间的显著相关性表明，Al和Mn在管垢和松散沉积物中存在共生行为。除了Al和Mn之间可能的相互作用外，Ba，Cu和As可能在Al和Mn混合物的形成过程中积累。样品中Mn、Cu、Pb、Zn、Ni、Co和Ba主要以铁锰氧化物形式存在，表明铁锰氧化物在这些无机污染物的积累和释放过程中起着重要作用。Fe、Al、As、Cr、V和Cd主要存在于残渣态，表明它们的迁移率较低。GCF结果表明，大部分样点存在一定的环境风险。RAC结果表明，高风险主要是由于镉的管垢和松散沉积物。根据CBSQGs评价，松散沉积物中的重金属危害更大，Ba在所有重金属中表现出最高的风险。
The accumulation of inorganic contaminants in drinking water distribution systems (DWDS) can greatly threaten water quality and safety. This work mainly focused on the accumulation, speciation and risk assessment of inorganic contaminants found in pipe scales and loose deposits in DWDS. Global contamination factor (GCF), risk assessment code (RAC) and consensus-based sediment quality guidelines (CBSQGs) were adopted for the potential health risk assessment of inorganic contaminants. The Tessier sequential extraction method was used to study the speciation distribution of inorganic contaminants in fourteen samples (six pipe scale samples, eight loose deposit samples) collected from real DWDS. The significant correlation between Al and Mn showed there was a co-occurrence behavior of Al and Mn in pipe scales and loose deposits. In addition to the possible interactions between Al and Mn, Ba, Cu and As were possibly accumulated during the formation of Al and Mn commixtures. Mn, Cu, Pb, Zn, Ni, Co and Ba in the samples were mainly associated with the Fe-Mn oxides fraction, which indicated Fe-Mn oxides might play an important role in the accumulation and release of these inorganic contaminants. Fe, Al, As, Cr, V and Cd mainly existed in the residual fraction, which indicated their low mobility. The GCF results demonstrated that most of the sample sites had a certain environmental risk. The RAC results showed that high risk mainly resulted from Cd both in pipe scales and loose deposits. According to the CBSQGs evaluation, heavy metals in loose deposits were more harmful, and Ba exhibited the highest risk among all heavy metals.