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Abstract
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Article Information:
Fluidization and Optimum Backwashing Conditions in Multimedia Filter
Rusul Naseer, Saad Abu Alhail and Lu Xi-Wu
Corresponding Author: Lu Xi-Wu
Submitted: 2011 August, 08
Accepted: 2011 September, 25
Published: 2011 November, 25 |
Abstract:
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The aim of this study is to study and evaluate the fluidization and optimum backwashing conditions
which include minimum fluidization velocity, expanded bed porosity and energy dissipation under different
operation conditions with different media grain size in multimedia filter. Theoretical and experimental study
was performed to evaluate the backwashing process of multimedia filter by fluidizing the filter media whereas
backwashing Process was carried out by a pilot laboratory filter of multimedia filter column using different
characteristics of filters media. A model was built to predict the expanded bed filter and the fluidized porosity.
The result showed that proposed model give a good fit with observed data. It is observed that smaller grain sand
was needed a lower value of backwash rate then of the higher grain sand to rise the filter media and the fixed
porosity 0.51 will expand to the optimum fluidized porosity 0.704 for a bigger value of grain sand while the
smaller value of grain diameter 0.5 mm was expanded to the optimum fluidized porosity 0.68. It is also
concluded that the effluent turbidity and detachment rate of deposited material decreases with increasing
backwashing time and increasing total backwash rate. It is also concluded that the energy dissipation and the
velocity gradient have a dominant mechanism of filter cleaning.
Key words: Backwashing models, energy dissipation, fluidization, minimum fluidizing velocity, , ,
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Abstract
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Cite this Reference:
Rusul Naseer, Saad Abu Alhail and Lu Xi-Wu, . Fluidization and Optimum Backwashing Conditions in Multimedia Filter. Research Journal of Applied Sciences, Engineering and Technology, (11): 1302-1307.
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ISSN (Online): 2040-7467
ISSN (Print): 2040-7459 |
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