Díaz Francisco J, Chow Alex T, O'Geen Anthony T, Dahlgren Randy A, Wong Po-Keung
Department of Land, Air, and Water Resources, University of California, Davis, California 95616, USA.
Environ Sci Technol. 2008 Aug 15;42(16):5992-7. doi: 10.1021/es800781n.
The effects of a restored wetland system in the Sacramento Valley, California on the production of dissolved organic carbon (DOC) and nitrogen (DON) and the formation potential of common disinfection byproducts (DBPs: trihalomethanes, haloacetonitriles, and chloral hydrate) were examined. Additionally, the effects of photodegradation and microbial degradation on dissolved organic matter properties and reactivitywith respect to DBP formation potential (DBP-FP) were evaluated. The wetlands increased DOC and DON concentrations by a factor of 2.2 and 1.9 times, respectively, but had little influence on the DOC and DON quality as compared to their source waters. The increase in DOC and DON concentrations increased the formation potential of all DBP species by >100%. Solar radiation and microbial degradation reduced the trihalomethane formation potential by 24 and 10%, respectively, during a 14 day incubation. In contrast, the chloral hydrate formation potential was increased by 22% after phototreatment. Results indicate that current flood-pulse management practices with a 2-3 week residence time could lead to wetlands acting as a source of DBP precursors. Enhanced DBP-FP is especially important as these wetlands contribute to a watershed that is a drinking water source for more than 23 million people.
研究了加利福尼亚州萨克拉门托河谷一个恢复的湿地系统对溶解有机碳（DOC）和溶解有机氮（DON）的产生以及常见消毒副产物（DBP：三卤甲烷、卤乙腈和水合氯醛）形成潜力的影响。此外，还评估了光降解和微生物降解对溶解有机物性质以及与消毒副产物形成潜力（DBP-FP）相关的反应性的影响。与源水相比，湿地分别使DOC和DON浓度增加了2.2倍和1.9倍，但对DOC和DON的质量影响很小。DOC和DON浓度的增加使所有DBP种类的形成潜力增加了100%以上。在14天的培养过程中，太阳辐射和微生物降解分别使三卤甲烷形成潜力降低了24%和10%。相比之下，光处理后水合氯醛的形成潜力增加了22%。结果表明，目前停留时间为2至3周的洪水脉冲管理做法可能导致湿地成为DBP前体的来源。由于这些湿地所在的流域是2300多万人的饮用水源，因此增强的DBP-FP尤为重要。
