4.7 Article

Trihalomethane precursors: Land use hot spots, persistence during transport, and management options

期刊

SCIENCE OF THE TOTAL ENVIRONMENT
卷 742, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.scitotenv.2020.140571

关键词

Disinfection byproducts; DBPs; Disinfection byproduct precursors; Dissolved organic matter; Dissolved organic carbon; Trihalomethanes

资金

  1. California Bay Delta Authority Ecosystem and Drinking Water programs

向作者/读者索取更多资源

To meet drinking water regulations, rather than investing in costly treatment plant operations, managers can look for ways to improve source water quality; this requires understanding watershed sources and fates of constituents of concern. Trihalomethanes (THMs) are one of themajor classes of regulated disinfection byproducts, formed when a specific fraction of the organic carbon pool-referred to as THM precursors-reacts with chorine and/or bromine during treatment. Understanding the source, fate, timing and duration of the organic compounds that react to form THMs will allow identification of targeted and effective management actions. In this study we evaluated THM precursor contributions from multiple land use categories and hydrologic contexts, including novel data for urban land uses that demonstrate strong potential to release water with high THM formation potential (THMFP; median 618 mu g L-1): greater than storm runoff integrated across a mixed-use (1/3 natural, 2/3 agricultural) watershed (median 460 mu g L-1), irrigation runoff from agricultural systems (357 mu g L-1), or runoff from a natural forested (median 123 mu g L-1) and shrubland/grassland (median 259 mu g L-1) watersheds. While individual storm events released high THM precursor concentrations over short periods, dry season agricultural irrigation as well as urban landscapes have the potential to release water high in THM precursors for several months. Experimental bioassays and sampling along 333miles of the California Aqueduct confirmed bioavailability and photooxidation potential of less than 10% for THM precursors, suggesting that rivers with residence times of days to weeks may act as THM precursor conduits, shuttling THM precursors from hundreds of miles away to drinking water in takes with minimal degradation. This finding has considerable implications for water managers, who may therefore consider THM precursor management strategies that target even sources located far upstream. (C) 2020 Published by Elsevier B.V.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据