Numerical prediction of the performance of horizontal sand filters as the pitch of the spiral protrusion changes

Article

Mossad, Ruth and Aral, Hal. 2013. "Numerical prediction of the performance of horizontal sand filters as the pitch of the spiral protrusion changes." Water Science and Technology. 67 (10), pp. 2249-2256. https://doi.org/10.2166/wst.2013.112
Article Title

Numerical prediction of the performance of horizontal sand filters as the pitch of the spiral protrusion changes

ERA Journal ID4696
Article CategoryArticle
AuthorsMossad, Ruth (Author) and Aral, Hal (Author)
Journal TitleWater Science and Technology
Journal Citation67 (10), pp. 2249-2256
Number of Pages9
Year2013
PublisherIWA Publishing
Place of PublicationUnited Kingdom
ISSN0273-1223
1996-9732
Digital Object Identifier (DOI)https://doi.org/10.2166/wst.2013.112
Web Address (URL)https://iwaponline.com/wst/article-abstract/67/10/2249/17528/Numerical-prediction-of-the-performance-of?redirectedFrom=fulltext
Abstract

The height of vertical sand filters are limited due to their structural cost. A horizontal sand filter may offer a better alternative, however flow channels to the least resistance zone generated at the top of the filter as the sand gets wet and settles. A horizontal sand filter, internally baffled with spiral protrusion, is numerically modelled to study the effect of these spirals in reducing the channelling and enhancing filter's effectiveness. Three different spiral pitches, 1.0 m, 0.75 m, and 0.5 m have been numerically modelled using Ansys Fluent software. The parameters investigated were the power needed to run a flow rate through the horizontal filter and the residence time. The results show that as the spiral pitch decreases the channelling reduces while the power increases. The power needed to pump a given flow rate of water in a 10m long horizontal filter in all three cases investigated was less than the power needed to pump the same flow rate to the top of a 10 m long vertically-standing sand filter. Results also showed that the time required traversing the flow through the sand filter increases in a nonlinear fashion as the pitch size decreases, however the effectiveness of the filter increases.

KeywordsCFD modelling; channelling; porous media; sand filter; wastewater treatment
ANZSRC Field of Research 2020400411. Water treatment processes
400499. Chemical engineering not elsewhere classified
401706. Numerical modelling and mechanical characterisation
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Byline AffiliationsDepartment of Mechanical and Mechatronic Engineering
Victoria University
Institution of OriginUniversity of Southern Queensland
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