污泥流变学及其厌氧消化混合特性数值模拟研究进展  

Research progress of sludge rheology and numerical simulation of mixing characteristics in anaerobic digestion reactors

作　　者：曹秀芹[1] 杨平[1] 赵振东[1] 

机构地区：[1]北京建筑大学城市雨水系统与水环境省部共建教育部重点实验室,北京100044

出　　处：《环境工程学报》2015年第3期997-1003,共7页Chinese Journal of Environmental Engineering

基　　金：北京市自然科学基金科技重点项目(KZ201310016017);北京建筑大学科研基地建设-科技创新平台项目(PXM2014_014210_000057)

摘　　要：污泥作为一种非牛顿流体,其流变特性对厌氧消化过程中的传质、传热、搅拌和物料输送等有着重要影响。系统阐述了污泥流变学属性,如流变特性的影响因素、流变模型以及其测试方法。由于污泥在厌氧消化反应器中流场的复杂性及其本身的不透明性,难以对其流场进行高效的实验测试,利用计算流体力学(CFD)技术结合流变学参数对流场进行数值模拟是一种有效工具。因此,综合分析了CFD技术在污泥厌氧消化过程中的研究现状及其搅拌混合过程中旋转桨叶处理方法的选择,并对污泥厌氧消化过程中进行数值模拟存在问题及进一步研究方向进行了展望。随着深入研究,以污泥流变学、计算流体力学为基础结合污泥厌氧消化生化反应过程联合数值模拟研究,将会为控制污泥的厌氧消化工艺提供更加全面和重要的技术措施。Sludge as a kind of non-Newtonian fluid,its rheological characteristics has a significant effect on mass and heat transfer,material mixing and transport in the process of anaerobic digestion. The rheology properties,such as influencing factors,rheological models and measurement of sludge rheological characterization were summarized. Due to the complexity of flow distribution in anaerobic digestion reactors and the opaqueness of sludge,numerical modelling is a much effective approach to describe the flow distribution by combining computational fluid dynamics( CFD) technology with the rheological parameters,instead of traditional experimental methods. Thereby,it’s of great value to demonstrate the current research situation concerning the application of CFD technology on the anaerobic digestion and the choice of rotating blades handling during the mixing process.Besides,the problems of numerical simulation applied in anaerobic digestion were also discussed. With further study,the numerical modelling of biochemical reaction on the basis of sludge rheological and computational fluid mechanics would provide more comprehensive and important technical measures for the process control of the sludge anaerobic digestion.

关 键 词：污泥 非牛顿流体 流变特性 流场 数值模拟 

分 类 号：X703[环境科学与工程—环境工程]