应实验室宋静副研究员邀请，美国南卫理公会大学助理教授孙文杰博士将于7月18日（下周一）来室交流，并作学术报告，报告信息如下，欢迎参加！
报告题目： Anoxic Oxidation of Arsenite Linked to Chemolithotrophic Denitrification: the Missing Link in the Biogeochemical Arsenic Cycle
报告人：孙文杰 博士， Department of Civil，Environmental Engineering， Lyle Engineering School，Southern Methodist University, Dallas, USA
报告时间: 2016年07月18日（星期一），上午09：30
报告地点：惠联楼第二报告厅
报告人简介：
孙文杰，硕士毕业于华南理工大学，博士毕业于美国亚利桑那大学市政与环境工程专业，现任职于美国南卫理公会大学（达拉斯市，德克萨斯州）助理教授。主要从事固体废物、污水、土壤和沉积物中有害物质的环境微生物处理技术研究，包括微生物厌氧（氨）氧化技术在污水处理（包括垃圾渗滤液）过程中的应用，结合纳米材料（纳米零价铁）的微生物方法在土壤和地下水修复的应用（Arsenic，Uranium等），半导体制造业副产品（纳米颗粒）对环境健康和安全的影响，分子微生物学在自然和人工生态系统中的应用以及市政和工业固废处理过程（例如，填埋）中的生物化学过程等。
报告英文摘要：
Anoxic Oxidation of Arsenite Linked to Chemolithotrophic Denitrification: the Missing Link in the Biogeochemical Arsenic Cycle
Wenjie Sun, Ph.D.
Department of Civil and Environmental Engineering
Southern Methodist University
Dallas, Texas 75275
Arsenic contamination of groundwater and surface water is a worldwide problem. The arsenic in the groundwater is of natural origin, and is released from the weathering of arsenic bearing minerals into the groundwater, owing to the anoxic conditions of the subsurface. This studies were to illustrate the importance of anoxic oxidation of arsenite (As(III)) to arsenate (As(V)) by chemolithotrophic denitrifying bacteria in the biogeochemical cycle of arsenic. The anoxic oxidation of As(III) to As(V) linked to denitrification was shown to be a widespread microbial activity in anaerobic sludge and sediment samples that were not previously exposed to arsenic contamination, although some reports from highly arsenic contaminated sites. A bioremediation strategy was explored that is based on injecting nitrate to support the microbial oxidation of Fe(II) and As(III) in the subsurface as a means to immobilize arsenic. Microbial oxidation by denitrifying microorganisms lead to the formation of ferric (hydroxides) which adsorbed As(V) formed from As(III)-oxidation. The studies demonstrated that anoxic microbial oxidation of As(III) and Fe(II) linked to denitrification significantly enhance the immobilization of arsenic in the anaerobic subsurface environments.
