期刊
CHEMICAL ENGINEERING SCIENCE
卷 247, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2021.117058
关键词
Biosand filter; Computational fluid dynamics (CFD); Drinking water; Residence time distribution (RTD); Software ANSYS Fluent
资金
- Global Challenges Research Fund (GCRF) UK Research and Innovation
- EPSRC [EP/P032427/1]
- EPSRC [EP/P032427/1] Funding Source: UKRI
This study analyzed the hydrodynamics of household slow sand filters (HSSFs) using computational fluid dynamics (CFD), revealing the flow characteristics inside the filters and identifying the working principles and filtering effects. Experimental results showed that HSSFs have flow characteristics close to plug flow reactors, with some dead zones found at the base of the filters.
This paper analysed geometries and flows in household slow sand filters (HSSFs) through computational fluid dynamics (CFD) to evaluate the hydrodynamics of filters. Four HSSFs in full scale were studied with a capacity to produce 48 L.d(-1) each with diameters of 190 mm and 250 mm and with a filter medium depth of 0.5 m. The hydrodynamics of the four mathematical models of the HSSFs was validated using the experimental residence time distribution (RTD). The Kruskal Wallis non-parametric test indicates that the results of the experimental RTDs and the simulated RTDs did not show significant differences, therefore the mathematical models represent the physical models, which requires a detailed 3D analysis of the flow in the filters. The results showed that the HSSFs have a flow close to plug flow reactor. Internal recirculation zones were not found, nor short-circuit ones; however, dead zones were verified at the base of the filter with volumes below 3% when compared to the total volume of the filtering and draining layers, not necessary to make changes in geometry. The results of the computational simulation showed that the continuous filters had a smaller velocity variation and the filters with smaller diameter presented a reduction in dead zones when compared to the filters with larger diameters operated in the same flow regime. The study focused on the hydraulic aspects of HSSFs, but it is noteworthy that the choice of the type of operation to be adopted by families that use this type of treatment depends on studies that assess the efficiency of water treatment filters that were not considered in this work. (C) 2021 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据