Functioning of filter structures in changing velocity conditions over time
Journal Title: Підводні технології - Year 2017, Vol 6, Issue
Abstract
One of the main constructions, which are used for preparing water of necessary quality, is rap-id filter. Functioning of such structures, as a rule, takes place in free-flow regime. Structures operation time depends on two main parame-ters: water treatment quality and provision of necessary calculated discharge. In this case it is accepted that fluid velocity in a filter bed is constant. In fact, functioning of such structures can differ from reviewed ones. A variant of rapid filters operation under substantial varia-tion of filtration velocity was analyzed in the article. Specific operation conditions of such structures and differential equations, which de-scribe water flow in filter medium and intensity of contaminants removal, were reviewed. As the result of conducted research, varia-tion over time of suspended particles concentra-tion in the filtrate, filter productivity, quantity of not clarified suspension which accumulates over filter bed under various sorption properties of filter medium was shown. Engineering calcu-lation methodology of filtration structures main characteristics, including technological filtration time, filtration cycle duration and optimal filter media height were suggested. Mentioned calcu-lated relations and equations were illustrated by example series with typical initial data.
Authors and Affiliations
Oleksandr Kravchuk
Keywords
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