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南开大学环境科学与工程学院

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讲座题目:Coal Ash Disposal: New Considerations for Environmental Risk Assessments and Waste Reuse Opportunities (14:00-15:00)

主讲嘉宾:Helen Hsu-Kim 教授

讲座时间:2016年6月3日(本周五),10:00-11:30 

讲座地点:环科楼B119

主办单位:环境科学与工程学院

嘉宾简介:Helen Hsu-Kim博士,美国杜克大学(Duke University)市政与环境工程系,Yoh Family副教授,终身教授,在环境化学、地球化学、重金属污染、土壤修复、纳米颗粒物的迁移转化、固体废物的资源化等诸多领域具有突出的科研成果。Hsu-Kim教授在《Nature Geoscience》、《ES&T》、《Nanotoxicology》等环境领域的顶级期刊发表了50多篇SCI学术论文,其学术成果被《Science》和《Chemical & Engineering News》期刊进行了重点推荐和评述,并被《The New York Times》(纽约时报)、《Discover》杂志、美国国家广播电台(NPR)等多家媒体进行了广泛报道。Hsu-Kim教授曾获美国青年科学家最高荣誉奖——总统奖,并被美国教育界著名杂志《Prism》选为20名40岁以下的明星科学家。

 

Seminar Title:
Coal Ash Disposal: New Considerations for Environmental Risk Assessments and Waste Reuse Opportunities

Abstract:
Coal combustion residuals are the solid wastes generated at coal-fired power plants and include fly ash, bottom ash, and sludge from flue gas desulfurization scrubbers. Collectively coal ash represents one of the largest industrial waste streams in the U.S., with more than 100 million metric tons generated annually. Recent failures of coal ash impoundments in North Carolina and elsewhere have encouraged environmental policy makers to reconsider guidelines for coal ash disposal and to explore opportunities to reuse coal ash for beneficial purposes. This talk will highlight our recent work to document the impact of coal ash holding ponds on water quality. I will present results of field studies and laboratory experiments with coal ash to demonstrate that the leaching and bioavailability of contaminants such as arsenic and mercury are strongly dependent on the biogeochcemical conditions of the field site, conditions that are not sufficiently considered in risk assessments for coal ash disposal. This talk will also include discussions on beneficial reuse opportunities for coal ash, namely the recovery of rare earth elements from coal fly ash. Rare earth elements are critical materials for a variety of modern technologies, and the instability of the supply chain for these elements has generated considerable interest for alternative sources. I will discuss our research to characterize the extent to which rare earth elements are enriched in coal fly ash and strategies to extract and concentrate these elements from ash wastes.


Bio:
Heileen (Helen) Hsu-Kim is an Associate Professor of Environmental Engineering at Duke University. Prior to joining the Duke faculty in 2005, Dr. Hsu-Kim completed her B.S. degree in Environmental Engineering at MIT, and M.S./Ph.D. degrees in Environmental Engineering at UC-Berkeley. Dr. Hsu-Kim’s expertise is aquatic geochemistry and her research focuses on the biogeochemistry of metals in the environment. In addition to her research on coal ash, Dr. Hsu-Kim studies mercury biogeochemistry and the environmental impacts of nanotechnology. Dr. Hsu-Kim is currently an RTI University Scholar and is in residence at RTI until the end of 2016.