Inflow rate-driven changes in the composition and dynamics of chromophoric dissolved organic matter in a large drinking water lake.
Inflow rate-driven changes in the composition and dynamics of chromophoric dissolved organic matter in a large drinking water lake.
复制标题
DOI：
10.1016/j.watres.2016.05.021
复制
发表时间：
2016-09
期刊：
影响因子：
12.8
通讯作者：
Yongqiang Zhou;Yunlin Zhang;E. Jeppesen;K. Murphy;Kun Shi;Mingliang Liu;Xiaohan Liu;G. Zhu
中科院分区：
文献类型：
--
作者：
Yongqiang Zhou;Yunlin Zhang;E. Jeppesen;K. Murphy;Kun Shi;Mingliang Liu;Xiaohan Liu;G. Zhu
饮用水湖泊在全球范围内受到威胁，因此需要保护。到目前为止，很少有研究已经进行了调查的组成和动态的发色溶解性有机物（CDOM）在饮用水湖泊的流入率的影响。这种CDOM可导致水的令人不快的味道和气味，并在饮用水处理期间产生不期望的消毒副产物。以千岛湖为研究对象，发现千岛湖水体中悬浮颗粒物（SPM）浓度随入湖流量的增加而显著增加（p< 0.001）。同样，入流速率与CDOM在350 nma（350）处的吸收系数和陆生类腐殖酸荧光C3之间存在密切关系，而入流速率与第一主成分（PC 1）得分之间存在负相关关系，而第一主成分（PC 1）得分又与CDOM的浓度和相对分子大小负相关（p< 0.001），即进入湖泊的CDOM浓度和分子大小与入湖流量成正比增加。此外，稳定同位素（δD和δ 18 O）在上游河口相对于下游剩余湖区的亏损，证实河流CDOM进入湖泊可能是由流入速度驱动。这进一步得到了支持显着较高的平均叶绿素-aandin situmeasured陆地CDOM荧光（365/480 nm）和表观氧利用率（AOU），并显着较低的平均PC 1和CDOM光谱斜率（S275-295）记录在上游河口比下游的主要湖区。入湖速率与入湖速率、入湖速率与入湖速率、入湖速率与入湖速率与入湖速率、入湖速率与入湖速率与入湖速率、入湖速率与入湖速率与入湖速率、入湖速率与入湖因此，雨季，特别是暴雨事件，对饮用水安全构成风险，并要求饮用水处理过程中更高的CDOM去除效率。
Drinking water lakes are threatened globally and therefore in need of protection. To date, few studies have been carried out to investigate how the composition and dynamics of chromophoric dissolved organic matter (CDOM) in drinking water lakes are influenced by inflow rate. Such CDOM can lead to unpleasant taste and odor of the water and produce undesirable disinfection byproducts during drinking water treatment. We studied the drinking water Lake Qiandao, China, and found that the concentrations of suspended particulate matter (SPM) in the lake increased significantly with inflow rate (p< 0.001). Similarly, close relationships between inflow rate and the CDOM absorption coefficient at 350 nma(350) and with terrestrial humic-like fluorescence C3 and a negative relationship between inflow rate and the first principal component (PC1) scores, which, in turn, were negatively related to the concentrations and relative molecular size of CDOM (p< 0.001), i.e. the concentration and molecular size of CDOM entering the lake increased proportionately with inflow rate. Furthermore, stable isotopes (δD and δ18O) were depleted in the upstream river mouth relative to downstream remaining lake regions, substantiating that riverine CDOM entering the lake was probably driven by inflow rate. This was further underpinned by remarkably higher mean chlorophyll-aandin situmeasured terrestrial CDOM fluorescence (365/480 nm) and apparent oxygen utilization (AOU), and notably lower mean PC1 and CDOM spectral slope (S275–295) recorded in the upstream river mouth than in the downstream main lake area. Strong negative correlations between inflow rate anda(250):a(365),S275–295, and the spectral slope ratio (SR) implied that CDOM input to the lake in rainy period was dominated by larger organic molecules with a more humic-like character. Rainy period, especially rainstorm events, therefore poses a risk to drinking water safety and requires higher removal efficiency of CDOM during drinking water treatment processes.