Disinfection by-product precursors introduced by sandstorm events: Composition, formation characteristics and potential risks

被引:6
作者
Du, Zhenqi [1 ,2 ,3 ,4 ]
Ding, Shunke [1 ,4 ]
Xiao, Rong [1 ,4 ]
Fang, Chao [1 ,4 ]
Jia, Ruibao [2 ,3 ]
Chu, Wenhai [1 ,4 ,5 ]
机构
[1] Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China
[2] Shandong Jianzhu Univ, Sch Municipal & Environm Engn, Jinan 250101, Peoples R China
[3] Shandong Prov Water Supply & Drainage Monitoring C, Room 2202,5111 Aoti Middle Rd, Jinan 250101, Peoples R China
[4] Minist Educ, Key Lab Yangtze River Water Environm, Shanghai 200092, Peoples R China
[5] Natl Engn Res Ctr Urban Pollut Control, Room 407,1239 Siping Rd, Shanghai 200092, Peoples R China
基金
中国国家自然科学基金;
关键词
Disinfection by-products; Sandstorm; Precursor; Atmosphere pollution; DRINKING-WATER; ORGANIC NITROGEN; LIGHT-ABSORPTION; EMISSION; MATTER; NITROSAMINES; CHLORINATION; GENOTOXICITY; RAINWATER; AEROSOLS;
D O I
10.1016/j.watres.2023.120429
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Sandstorms, a natural meteorological event, occur repeatedly during the dry season and can accumulate large amounts of natural/anthropogenic pollutants during the deposition process, potentially introducing disinfection by-product (DBP) precursors into surface waters. In this study, the characteristics of sandstorm-derived dissolved organic matter (DOM) and its DBP formation potential were elucidated. Overall, sandstorm-derived DOM mainly consisted of low-molecular-weight, low-aromaticity, high-nitrogen organic matter, with a dissolved organic carbon (DOC) release yield of 14.4 mg-DOC/g. The halogenated DBP formation potential (calculated as total organic halogen) of sandstorm-derived DOM was comparable to that of surface water, while the normalized DBPassociated toxicity was 1.96 times higher. Similar to DOM introduced by other depositional pathways, sandstorm-derived DOM also had higher yields of highly cytotoxic DBPs (haloacetaldehydes [HALs], haloacetonitriles [HANs] and halonitromethanes [HNMs]). The average atmospheric deposition flux for DOM during the sandstorm event (50.4 & PLUSMN; 2.1 kg km-2 day � 1) was 6.95 times higher than that of dry deposition, indicating a higher probability of contaminant input. Simultaneously, the estimation revealed that the sandstorm will increase the formation potential of toxicity forcing agents, such as HALs, HANs and HNMs, in surface water by 3.87%, 2.39% and 9.04%, respectively. Considering the high frequency of sandstorm events and the sorption of other organic pollutants by sand and dust, the impact of sandstorms on surface water quality should be of concern.
引用
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页数:8
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