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Journal of Applied Sciences
  Year: 2004 | Volume: 4 | Issue: 3 | Page No.: 493-497
DOI: 10.3923/jas.2004.493.497
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Using Filter Sand Abrasion to Predict Flow Rate and Filter Bed Management

I. Adewumi, O.E. Ojo and O. Aribisala

Most Waterworks in Nigeria and other African developing countries still import filter sand from developed countries for the operation of rapid filter beds in water treatment facilities. The variation of the physical characteristics such as permeability (k), equivalent diameter (deq) and sphericity (ψ) of three types of filter sand (FS) grains were studied as they were degraded by simulated abrasion. The flow rate and permeability coefficient of raw imported FS at Ado-Ekiti waterworks and a locally-sourced FS at OAU waterworks were the same at 1.5 cm3 s–1 and 2.79x10–3 cm s–1, respectively compared with erosion sand?s values of 1.77 cm3 s–1 and 3.3x10–3 cm s–1 for the parameters. At the end of more than 12% degradation, the flow rates for the imported, locally-sourced and erosion sands reduced to 0.45, 0.35 and 0.23 cm3 s–1, respectively. The coefficient of permeability of the imported, local and erosion FS also reduced to 8.38x10–4, 6.52x10–4 and 4.28x10–4cm s–1, respectively. The work established that deq might be used to predict when the filter media are due for replacement. The method may be useful to engineers for FS material selection and projecting what quantity may be required for stocking a water treatment plant.
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How to cite this article:

I. Adewumi, O.E. Ojo and O. Aribisala, 2004. Using Filter Sand Abrasion to Predict Flow Rate and Filter Bed Management. Journal of Applied Sciences, 4: 493-497.

DOI: 10.3923/jas.2004.493.497






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