Deicing Road Salts May Contribute to Impairment of Streambeds through Alterations to Sedimentation Processes

Deicing Road Salts May Contribute to Impairment of Streambeds through Alterations to Sedimentation Processes
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除冰盐可能会通过改变沉积过程而损害河床

DOI:
10.1021/acsestwater.1c00300
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发表时间:
2022
期刊:
ACS ES&T Water
影响因子:
--
通讯作者:
Strom, Kyle
Strom, Kyle
中科院分区:
--
文献类型:
--
作者:
Abolfazli, Ehsan;Strom, Kyle

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在过去的80年里,美国越来越多地使用道路除冰盐。先前的研究表明,这些盐会对淡水生物产生恶化的影响。在这里,我们假设在水流中引入道路盐也可以促进悬浮在水柱中的泥浆颗粒的聚集。这种聚集,也称为絮凝,提高了沉积速率,并可能导致河床上细沉积物的积累增加,从而导致底栖生态系统的退化。在本实验室研究中,我们专门研究了道路盐如何影响(1)湍流水柱中泥浆聚集体的大小分布和(2)泥浆的总体沉降速率。结果表明,在美国弗吉尼亚州西南部的一条溪流中加入道路盐改变了悬浮颗粒大小的分布。盐的加入使大絮凝体中存在的泥浆量增加,总体平均粒径增加约40%。结果,泥浆的沉降速度相对于无盐悬浮液有所增加。我们的研究结果表明,道路盐对泥浆沉积的潜在负面影响应该进一步研究。
Deicing road salts have been increasingly used in the United States over the past 80 years. Previous studies have shown that these salts can have deteriorating effects on freshwater organisms. Here, we hypothesize that the introduction of road salts to streamwater can also boost aggregation of mud particles suspended in the water column. Such aggregation, also known as flocculation, enhances deposition rates and may lead to increased accumulation of fine sediment on streambeds, thereby contributing to the degradation of benthic ecosystems. In this laboratory study, we specifically investigate how road salts impact (1) the size distribution of mud aggregates in a turbulent water column and (2) the overall settling rate of the mud. The results showed that adding road salts to water samples collected from a stream in southwest Virginia, USA changed the distribution of suspended particle sizes. The addition of salt led to more of the mud existing in large flocs and an overall increase in average size by about 40%. As a result, the settling rate of the mud increased relative to the suspensions without salt. Our results suggest that potential negative effects of road salts on mud deposition should be investigated further.
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