Evaluation of Roughing and Slow Sand Filters for Water Treatment

The present study examined the potential of someroughing filter media, prepared from locally availablematerials in removing organic matter and turbidityfrom surface water. Also, the study included testingthe efficiency of roughing filter followed by slowsand filter in minimizing the suspended load o...

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Bibliographic Details
Published in:Water, air, and soil pollution air, and soil pollution, 2000-05, Vol.120 (1-2), p.21-28
Main Authors: El-Taweel, Gamila E, Ali, Gamila H
Format: Article
Language:English
Subjects:
Algae
Aquatic plants
Bacillariophyceae
Bacteria
Candida
Candida albicans
Counting
Environmental monitoring
Fecal coliforms
Filter media
Filters
Gravel
Marine microorganisms
Media
Organic matter
Roughing
roughing filters
Sand
Sand filters
slow sand filters
Soil pollution
Surface water
Suspended load
Turbidity
Water treatment
Yeasts
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Summary:The present study examined the potential of someroughing filter media, prepared from locally availablematerials in removing organic matter and turbidityfrom surface water. Also, the study included testingthe efficiency of roughing filter followed by slowsand filter in minimizing the suspended load on thesubsequent water treatment steps. Based onmicroorganisms removal and turbidity data, filtermedia consisted of three layers of gravel ranked topamong six of the media tested, showing 84-100%removal for chlorophyll 'a' green algae, blue-greenalgae, diatoms, total algal count, bacterial count (at22 and 37 C), total coliforms, faecal coliform,faecal streptococci, yeast and Candida albicans.Using slow sand filter after roughing filter improvedthe percentage removal of turbidity, where it reachedup to 83% after roughing filter while it reached 92%after slow sand filter. From the view point ofaesthetic quality of the filtered water, the resultsof the analyzed physico-chemical parameters showed nochange before and after the use of the roughing andslow sand filters.
ISSN:0049-6979
1573-2932
DOI:10.1023/A:1005252900175