Collaborative Research: Microbial Arsenate Reduction Control on Arsenic in Groundwater

合作研究：微生物砷酸盐还原控制地下水中的砷

• 批准号: 0809903
• 负责人: Chen Zhu
• 金额: $ 9.86万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-01 至 2013-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0809903&HistoricalAwards=false
• 关键词: Collaborative; Research; Microbial; Arsenate; Reduction

Title: Microbial Arsenate Reduction Control on Arsenic in GroundwaterAbstract The proposed research addresses natural occurrences of elevated arsenic in aquifers, a compelling public health hazard to a large population in both the United States and areas around the world. We focus on the role of microorganisms in controlling arsenic concentrations in aquifers, particularly at low values but still above the drinking water standards. The proposed study will determine quantitatively the role of microbial arsenate reduction in the bedrock aquifer in the Southern Willamette Basin, Oregon, USA. Arsenic occurs naturally in the aquifer at concentrations as high as 2000 parts per billion (ppb). This aquifer serves as a model for studying arsenic contamination in aquifers of felsic volcanic rocks and related alluvial sediments. We will conduct field biostimulation experiments and biogeochemical reactive transport modeling to test the hypothesis that microbial arsenate reduction controls significantly arsenic attenuation and mobilization in anoxic aquifers. Results of this study will pinpoint quantitatively the significance of different microbial functional groups in regulating arsenic concentrations in the aquifer. The theoretical component of this study will advance biogeochemical reaction modeling that couples microbial metabolisms with geochemical reactions. Results of this study will also provide critical information concerning groundwater microbiology for government agencies in designing effective strategies and regulations for groundwater resource management, monitoring, and protection. We will collaborate with science instructors at high schools near the field site to develop a replicable and sustainable classroom lesson on arsenic into their science curriculum. The teaching portfolio of the arsenic lesson will be distributed to all Oregon K-12 educators to help Oregon public schools better prepared for a new requirement of a science class with laboratory experience by the Oregon State Board of Education.

标题：地下水中砷的微生物砷酸盐减少控制摘要这项拟议的研究解决了含水层中砷含量升高的自然现象，这是对美国和世界各地大量人口的一个令人信服的公共卫生危害。我们重点关注微生物在控制含水层砷浓度方面的作用，特别是在低浓度但仍高于饮用水标准的情况下。拟议的研究将定量确定美国俄勒冈州威拉米特盆地南部基岩含水层中微生物砷酸盐还原的作用。砷自然存在于含水层中，浓度高达十亿分之 2000 (ppb)。该含水层可作为研究长英质火山岩含水层和相关冲积沉积物中砷污染的模型。我们将进行现场生物刺激实验和生物地球化学反应输运模型，以检验微生物砷酸盐还原显着控制缺氧含水层中砷的衰减和迁移的假设。这项研究的结果将定量地确定不同微生物功能群在调节含水层砷浓度方面的重要性。这项研究的理论部分将推进将微生物代谢与地球化学反应耦合起来的生物地球化学反应模型。这项研究的结果还将为政府机构设计有效的地下水资源管理、监测和保护战略和法规提供有关地下水微生物学的重要信息。我们将与现场附近高中的科学教师合作，在他们的科学课程中开发可复制且可持续的砷课堂课程。砷课程的教学组合将分发给所有俄勒冈州 K-12 教育工作者，以帮助俄勒冈州公立学校更好地准备俄勒冈州教育委员会对具有实验室经验的科学课程的新要求。