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The influence of global characteristics of afiltering system on the efficiency in the process of deep bed filtration

100%

Baran B. , Domański Z.

Prace Naukowe Instytutu Matematyki i Informatyki Politechniki Częstochowskiej

2007

tom Vol. 6, nr 1

5-8

In the process of deep bed filtration there is an occurrence of clogging the filters bonds by particles of size comparable to the size of the bonds. In this paper it is examined how the structure of connections of a filter's bonds influences the time of its clogging as well as the efficiency of the filtering process. It is shown that the clogging time depends on two things: the network coordinating number - it means the average number of bonds with a common node and on a percolation threshold - it means the fraction of clogged bonds when the statistic lose of communication between the entrance and exit of the system occurs.

Laboratory and numerical experiments into efficient management of VDR filter plants

36%

Zielina M. , Dąbrowski W. , Mackie R. I.

Environment Protection Engineering

2015

tom Vol. 41, nr 3

101--120

runs are achieved when the highest flow through the most recently backwashed filter and the highest available head loss coincide. This rule has previously been published by Dąbrowski, who used a simplified mathematical model of VDR filters developed by Di Bernardo. However, until now no experimental verification of this optimisation approach has been presented. A series of tests were carried out on a laboratory VDR filter plant, using a suspension collected from an industrial sedimentation tank and using alum as a coagulant. The results of the experiments were compared with computations carried out according to a combined unit bed element (UBE)-phenomenological model of deep bed filtration adapted to VDR operation by Mackie and Zhao. It was confirmed that the longest filtration runs did indeed correspond to the pairs of the highest H and q1/qavr. The UBE-phenomenological model of deep bed filtration gave results of computations quite close to experimental results and improved the accuracy of calculations based on the theoretical model by Di Bernardo.