New PDF release: Modelling in the Technology of Wastewater Treatment

By Imre Horváth (Auth.)

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The resulting inconsistencies can readily be traced back t o this circumstance. The modelling problems associated with deep-bed filters will b e reviewed in brief, emphasizing t h a t further detailed theoretical a n d experimental studies are needed on this subject. 46 The hydraulic aspects of scaling-up Model studies into the hydraulics of flow in porous media have been described in several reports and papers, mostly in connection with seepage problems [73, 74]. In Hungary, the scale-up criteria of seepage within the validity range of the Darcy Law, specifically in t h a t of the K o z e n y - C a r m a n equation, have been considered by Mosonyi and Kovâcs [75].

The concentration C can be increased by sludge recirculation. 56 (f) The product Gt may become the controlling factor in cases where the role of the concentration C is of secondary importance only. This is the situation for instance with horizontal-flow clarifiers in contrast t o the sludge blanket types. In this latter case the optimal value of the product CGt should be adjusted. According t o Ives, in actual sludge blanket clarifiers t h e product CGt assumes values ranging from 60 t o 120, a typical normal value 3 being 100.

118a-c) Therefore the factor XQ is closer to the value found on the basis of the F r o u d e Law. Varrok himself considered these results to be of only theoretical rather than practical interest. Hydraulic studies on a series of settling-clarifier basins have been described by Ivicsics [97]. F r o m the results of tests performed with clear water he arrived at a number of interesting conclusions concerning sound and poor geometrical designs. It should be emphasized that the results of model tests made with water containing no suspended matter can only be applied with care.

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