Electron Beam Irradiation of Aqueous Systems at Large Scale

这是一个为项目提供更新支持的奖项 先前在NSF批准号87-14640下进行，其中 现有的1.5兆电子伏，50毫安，电子加速器位于 在迈阿密的弗吉尼亚重点污水处理厂 被用来研究电子束在 环境工程实践 结果证实了 电子束灭活 水悬浮液中微生物的破坏 水溶液中的有机污染物，并定义 反应速率常数与破坏 水中的有机污染物。 该项目的研究包括扩大对以下方面的研究： 多环芳烃的剂量-破坏关系 碳氢化合物，确定反应机理和 由电子束辐射产生的副产物， 探讨更有效地列报 流体束，研究自由基清除剂和 增强器，以提高光束的效率，以及 开发成本模型，以确定 电子束在环境中应用的可行性 工程实践 这项研究的结果在一个足够大的 规模，以获得工程设计参数可能 用于环境工程实践。 潜在的应用包括工艺设计和 地表水和地下水净化系统， 危险废物的销毁、污泥的处理 从废水处理中获得，以提高其 脱水性和对稳定化过程的适应性， 污泥和加工副产品的消毒， 改善其生物降解性或从水溶液中除去 通过其他物理或化学过程解决。

This is an award to provide renewal support for a project previously conducted under NSF Grant No. 87-14640 in which an existing 1.5 Mev, 50 ma, electron accelerator located at the Virginia Key Wastewater Treatment Plant in Miami was used to study electron-beam applications in environmental engineering practice. Results confirmed the effectiveness of the electron beam for inactivation of microorganisms in aqueous suspension, destruction of organics contaminants in aqueous solution, and defined reaction rate constants associated with destruction of organic contaminants in water. Research in this project includes expanding studies of dose-destruction relationships for polycyclic aromatic hydrocarbons, identification of reaction mechanisms and byproducts produced by electron beam irradiation, exploring methods for more efficient presentation of the fluid to the beam, study of radical scavengers and enhancers to improve the beam's efficiency, and development of cost models for determination of economic feasibility of electron beam use in environmental engineering practice. Results of this research conducted at a sufficiently large scale to obtain engineering design parameters are likely to be utilized in environmental engineering practice. Potential applications include design of processes and systems for decontamination of surface and groundwaters, destruction of hazardous wastes, treatment of sludges derived from treatment of wastewater to improve their dewaterability and amenability to stabilization processes, disinfection of sludges and processing byproducts and to improve their biodegradability or removal from aqueous solution by other physical or chemical processes.