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Comparative Study On The Filtration Properties Of Local Sand, Rice Hull And Rice Hull Ash

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Publisher: ADEWUNMI

Authors: Adewunmi ET AL

Publish Year: 2011

Pages: 27

ISBN10: 103-129

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This paper investigates the potentials of some locally available materials namely local
sand, rice hull ash and rice hull, as a substitute for imported sand in raw water
filtration. The materials were subjected to various soil mechanics and hydraulics tests
including: particle size distribution, specific gravity, porosity, permeability and
filterability. The paper also investigated the physical characteristic of local sand, rice
hull and rice hull ash as filter media for water treatment, to investigate the filtration
performance or features of local sands, rice hull and rice hull ash, and; to compare the
filtration features of these three materials with existing standards.. The abilities of the
local sand, rice hull ash and rice hull to remove turbidity are found to be 21%, 58%
and 53%, while E. Coil removal is 41%, 94% and 100% respectively. Flocculation
pre-treatment only increased the turbidity removal using rice hull ask and rice hull,
while their E. coil was not affected. But for the local sand both the turbidity and E.
coli removal rates were 58% and 65% respectively. Significant difference was
established among these three materials using one way ANOVA at 95% confidence
level. A further statistical analysis using least Square Deviation (LSD) and Dunnett
statistic indicates that there is no significant difference in performance between rice
hull and rice hull ask, except between local sand and the other filter media considered

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