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Legacy of Coal Combustion: Widespread Contamination of Lake Sediments and Implications for Chronic Risks to Aquatic Ecosystems
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-10-03 , DOI: 10.1021/acs.est.2c04717 Zhen Wang 1 , Ellen A Cowan 2 , Keith C Seramur 2 , Gary S Dwyer 1 , Jessie C Wilson 2 , Randall Karcher 2 , Stefanie Brachfeld 3 , Avner Vengosh 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2022-10-03 , DOI: 10.1021/acs.est.2c04717 Zhen Wang 1 , Ellen A Cowan 2 , Keith C Seramur 2 , Gary S Dwyer 1 , Jessie C Wilson 2 , Randall Karcher 2 , Stefanie Brachfeld 3 , Avner Vengosh 1
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Elevated concentrations of toxic elements in coal ash pose human and ecological health risks upon release to the environment. Despite wide public concerns about water quality and human health risks from catastrophic coal ash spills and chronic leaking of coal ash ponds, coal ash disposal has only been partially regulated, and its impacts on aquatic sediment quality and ecological health have been overlooked. Here, we present a multiproxy approach of morphologic, magnetic, geochemical, and Sr isotopic analyses, revealing unmonitored coal ash releases over the past 40 to 70 years preserved in the sediment records of five freshwater lakes adjacent to coal-fired power plants across North Carolina. We detected significant sediment contamination and potential chronic ecological risks posed by the occurrence of hundreds of thousands of tons of coal ash solids mainly resulting from high-magnitude stormwater runoff/flooding and direct effluent discharge from coal ash disposal sites. The proximity of hundreds of disposal sites to natural waterways across the U.S. implies that such contamination is likely prevalent nationwide and expected to worsen with climate change.
中文翻译：
煤炭燃烧的遗产：湖泊沉积物的广泛污染及其对水生生态系统慢性风险的影响
煤灰中有毒元素的浓度升高会在释放到环境中时对人类和生态健康构成威胁。尽管公众普遍关注灾难性煤灰泄漏和煤灰池长期泄漏带来的水质和人类健康风险，但煤灰处置仅得到部分监管，其对水生沉积物质量和生态健康的影响被忽视。在这里，我们提出了一种形态学、磁学、地球化学和 Sr 同位素分析的多代理方法，揭示了过去 40 到 70 年间未监测的煤灰释放，这些煤灰释放保存在北卡罗来纳州与燃煤发电厂相邻的五个淡水湖的沉积物记录中. 我们检测到大量沉积物污染和潜在的慢性生态风险，主要是由于大量雨水径流/洪水和煤灰处置场直接排放的污水造成的数十万吨煤灰固体。美国有数百个处置场靠近天然水道，这意味着这种污染可能在全国范围内普遍存在，并且预计会随着气候变化而恶化。
更新日期：2022-10-03
中文翻译：
煤炭燃烧的遗产：湖泊沉积物的广泛污染及其对水生生态系统慢性风险的影响
煤灰中有毒元素的浓度升高会在释放到环境中时对人类和生态健康构成威胁。尽管公众普遍关注灾难性煤灰泄漏和煤灰池长期泄漏带来的水质和人类健康风险，但煤灰处置仅得到部分监管，其对水生沉积物质量和生态健康的影响被忽视。在这里，我们提出了一种形态学、磁学、地球化学和 Sr 同位素分析的多代理方法，揭示了过去 40 到 70 年间未监测的煤灰释放，这些煤灰释放保存在北卡罗来纳州与燃煤发电厂相邻的五个淡水湖的沉积物记录中. 我们检测到大量沉积物污染和潜在的慢性生态风险，主要是由于大量雨水径流/洪水和煤灰处置场直接排放的污水造成的数十万吨煤灰固体。美国有数百个处置场靠近天然水道，这意味着这种污染可能在全国范围内普遍存在，并且预计会随着气候变化而恶化。
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