RUI: Modeling of Sludge Dewatering Processes

RUI：污泥脱水过程建模

• 批准号: 8821199
• 负责人: Scott Wells
• 金额: $ 12.52万
• 依托单位: Portland State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-03-01 至 1992-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8821199&HistoricalAwards=false
• 关键词: RUI; Modeling; Sludge; Dewatering; Processes

The objective of this project is to improve the process by which equipment and processes are designed for removing water from sludges. This will involve the development of computer based simulation models of full-scale dewatering facilities that will enable cost- effective design and the ability to identify operational conditions to maximize dewatering efficiency. Theoretical approaches will include modeling the physics of the belt filter press which involves gravity sedimentation, cake filtration in a laterally unconfined domain incorporating the effect of secondary consolidation or creep, cake removal mechanisms, and belt washing efficiency. The integrated model of the belt filter press is expected to be driven by laboratory derived relationships of sludge porosity as functions of effective stress and permeability. These relationships will be determined by examining specific resistance and compression- permeability cell data. The model will be tested with data from a scale model filter press using a reproducible suspension of kaolin. Further model testing will be accomplished using the city of Portland's full-scale belt filter presses to analyze the model's ability to predict dewatering characteristics of an anaerobically digested sludge. Results of this project are expected to be used in improvements of current practice in designing systems for dewatering sludges, processing and management of which are approximately half the cost of wastewater treatment.

该项目的目标是改进这一进程 设备和工艺设计用于 从污泥中除去水。 这将涉及 开发基于计算机的仿真模型， 全面的排水设施，使成本- 有效的设计和识别能力 最大限度地脱水的操作条件 效率 理论方法将包括 模拟带式压滤机的物理特性， 包括重力沉降，滤饼过滤， 横向无约束域， 次固结或蠕变，滤饼去除 机构和带清洗效率。 的 希望能为带式压滤机提供一个完整的模型 由实验室推导的关系驱动， 污泥孔隙度作为有效应力的函数， 磁导率 这些关系将由 通过检查电阻率和压缩率， 渗透单元数据。 该模型将进行测试， 数据来自一个规模模型压滤机使用 高岭土的可再现悬浮液。 进一步的模型 测试将使用城市完成， 波特兰的全尺寸带式压滤机来分析 该模型预测脱水的能力 厌氧消化污泥的特性。 该项目的成果预计将用于 改进当前系统设计实践 用于污泥脱水、处理和管理 大约是废水成本的一半 治疗