CAREER: Sorption and Biodegradation Processes for Removal of Pharmaceutical Compounds in Biological Systems

职业：去除生物系统中药物化合物的吸附和生物降解过程

• 批准号: 0546388
• 负责人: Willie Harper
• 金额: --
• 依托单位: Auburn University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-05-01 至 2008-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0546388&HistoricalAwards=false
• 关键词: CAREER; Sorption; Biodegradation; Processes; Removal

Harper0546388The focus is biodegradation and sorption of pharmaceutical compounds (PhACs) in engineered bioreactors.Intellectual Merit. These research results are expected to be an important part of the foundation needed for understanding fate of PhACs in both engineered and natural systems. The use of FED modeling for predicting biological transformations has not been done before, and may provide the missing, conceptual framework needed for a more complete understanding of transformation pathways. The proposed sorption studies will establish the basic thermodynamic properties of PhAC sorption and will fully uncover the connection between particle size and hysteresis.The expected results have potential to make fundamental scientific contributions, while also making direct connections to design and operating strategies for water quality professionals. The research uses basic scientific concepts from quantum chemistry and thermodynamics, and the experimental tasks utilize modern analytical techniques and computational software. The four key research hypotheses are:1) The biological oxidation of PhACs and their metabolites will occur at the location where the frontier electron density (FED) is highest. FED may be established as an organizing principle for predicting biologically-mediated PhAC transformation. These results may impact the understanding of PhAC mass transport in bioreactors, surface waters, and sediments.2) PhAC sorption is entropy-driven, endothermic, and diffusion-controlled. Establishing the thermodynamic baseline for PhAC sorption to activated sludge biomass will help to understand available data in a meaningful way.3) Sorption hysteresis is more pronounced as the particle size distribution shifts toward larger sizes. The results could produce a fundamental understanding for how sorption hysteresis is affected by activated sludge particle size.4) PhACs or their metabolites located within the interior of larger floc particles are more persistent. When both biodegradation and sorption occur simultaneously, PhACs and their metabolites may become trapped within the interior of activated sludge floc particles, where biological activity is lower.Education and outreach. The integrated education and outreach activities will enrich the environmental engineering program at Auburn University with new course elements that enhance learning, promote diversity in engineering through collaboration with the Auburn University BellSouth Minority Engineering program (BMEP), and promote environmental literacy among middle school students. The new course elements include using the cooperative learning strategy and interdisciplinary design projects. BMEP activities faculty mentoring, problem-solving labs, and direct involvement in the research project. I also propose to promote environmental literacy in young people by incorporating a 1 hr environmental learning module in Auburn University annual interactive learning conference for middle school students. Broader Impacts are expected that at the successful completion of this project will help place the members of my research group near the center of the international, interdisciplinary dialogue concerning the proliferation of PhACs in the environment. I further expect that the curriculm at Auburn University will be strengthened through new course elements, diversity in engineering will be enhanced, and local middle school students will become more environmentally literate.

Harper 0546388重点是药物化合物（PhAC）在工程生物反应器中的生物降解和吸附。知识产权。这些研究结果有望成为理解PhAC在工程和自然系统中命运所需基础的重要组成部分。使用FED模型来预测生物转化以前没有做过，并且可以提供更完整地理解转化途径所需的缺失的概念框架。拟议的吸附研究将建立PhAC吸附的基本热力学性质，并将充分揭示粒径和滞后之间的联系，预期的结果有可能作出基础科学贡献，同时也使水质专业人员的设计和操作策略的直接连接。该研究使用量子化学和热力学的基本科学概念，实验任务利用现代分析技术和计算软件。四个关键的研究假设是：1）PhAC及其代谢产物的生物氧化将发生在前线电子密度（FED）最高的位置。FED可以被建立为用于预测生物介导的PhAC转化的组织原则。这些结果可能会影响的理解PhAC质量传输在生物反应器，表面沃茨，和沉积物。2）PhAC吸附是熵驱动，吸热，扩散控制。建立活性污泥生物质吸附PhAC的热力学基线将有助于以有意义的方式理解现有数据。3）随着粒径分布向更大尺寸转变，吸附滞后更加明显。研究结果有助于从根本上理解活性污泥颗粒大小对吸附滞后的影响。4）PhAC或其代谢产物位于较大絮体颗粒内部更持久。当生物降解和吸附同时发生时，PhAC及其代谢物可能被困在活性污泥絮凝颗粒内部，那里的生物活性较低。综合教育和推广活动将丰富奥本大学的环境工程项目，新的课程元素可以增强学习，通过与奥本大学贝尔南方少数民族工程项目（BMEP）合作促进工程多样性，并促进中学生的环境素养。新的课程元素包括使用合作学习策略和跨学科设计项目。BMEP活动教师指导，解决问题的实验室，并直接参与研究项目。我还建议通过在奥本大学每年的中学生互动学习会议上纳入一个1小时的环境学习模块，促进年轻人的环境素养。更广泛的影响，预计在这个项目的成功完成将有助于我的研究小组的成员靠近中心的国际，跨学科的对话有关PhAC在环境中的扩散。我还希望奥本大学的环境管理将通过新的课程元素得到加强，工程学的多样性将得到加强，当地中学生将变得更加环保。