Modelling Efficiency of On-Farm Sand Filter System in Microbial Contaminant Removal in Wastewater, Ghana
Research Area: | Volume 4 Issue 1, Jan. 2015 | Year: | 2015 |
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Type of Publication: | Article | Keywords: | Wastewater, On-Farm Sand Filter, Microbial Contaminant, Efficiency |
Authors: |
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Journal: | IJEIR | Volume: | 4 |
Number: | 1 | Pages: | 125-130 |
Month: | Jan.-Feb. | ||
ISSN: | 2277-5668 | ||
Abstract: | Wastewater irrigation without adequate
safeguards has been noted to have serious drawbacks for
human health and the environment. This study modelled the
levels of microbial contaminants in wastewater used for periurban
vegetable crop production and also assessed the
efficiency of an on-farm sand filter system on the
contaminants in the Zagyuri community of the Tamale
Metropolis of Ghana. The study considered widely the
selection of a very good filter material and sizing of the filter
column. Varying lengths of filter columns and depths of filter
material were used in the design of the on-farm sand filter
columns. With average dry bulk density and particle density
of the filter media being 1.58 gcm-3 and 2.66 gcm-3 the
porosity was 39.4 %. Considering the environmental
conditions and the results obtained, mathematical models
were developed for selection of the filter size. The results
indicated that longer filter columns were more efficient in the
removal of microbial contaminants contained in the
wastewater. The concentration of faecal and total coliforms
as well as helminth eggs was 24,444 MPN/l, 56,930 MPN/l
and 56 eggs/l for the wet season respectively. In the dry
season however, faecal coliform recorded a mean
concentration of 13,780 MPN/l, total coliform had 41,113
MPN/l whilst helminth eggs were 74 eggs/l. Sizing of filter
column in the design of wastewater treatment system using
mathematical models have been realized to be very
important in the achievement of good results. |
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Full text: IJEIR 1367_final.pdf
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