Fact Sheet: Hydraid Biosand Water Filter


Does the source of sand affect filter performance?

This presentation discusses whether the source of sand influences the performance of the of the biosand filter. Two studies are presented and summarized in this presentation from the CAWST Learning Exchange.

Learnings from Field Evaluations of BSF Projects 2004-2010

16 Field Evaluations were looked at and data was compiled to see the outcomes of BSF projects in the areas of adoption, user perceptions, water quality, and filter problems.

Filtration Sand for the Biosand Filter, 2008

This presentation summarizes the researchto determine the optimal size of sieve screen (0.7 mm opening size) to prepare the filtration sand.  It provides the recommended effective size (ES) for the filtration sand (0.15 to 0.20 mm) the uniformity coefficient (UC <2.5) and the maximum amount of very fine sand grains (maximum 4% < 0.1mm; passing through #150 mesh screen). 

Sand and gravel "swing" sieving videos

Here are videos of the swing sieves used by Pure Water for the World - Haiti to prepare the biosand filter filtration sand and gravel

Operating Parameters for the Biosand Filter

This presentation by CAWST provides answers to the most imortant operating questions; 
            How does the BSF work? How should the biosand filterbe used?
 The 12 slides cover these topics:
1.Filter mechanisms

All About Filtration Sand CAWST

This is a 'teaching' presentation to understand more about filtration sand.  This is the most important aspect of the biosand filter because it is what cleans the water.  
Topics include finding the best source of sand and analyzing it using sand grain size analysis.
The recommended sand parameters are provided and the interaction of effective size and uniformity coefficient on flow rate is visually described.

CAWST Sand Sorter Version 1.0

We have just completed the fabrication plans for the CAWST Sand Sorter! (Version 1.0)

What is a Sand Sorter ?

In short: It sieves and washes biosand filter filtration sand.

Fact Sheet: Biosand Filter

Virus Reduction by Microbial Mechanisms in the BSF

This presentation of published research by Elliot, DiGiano, & Sobsey at the University of North Carolina [Elliot, 2011] found that the BSF is successful in virus reduction by the microbial mechanism of the biolayer deep in the sand bed - not in the schmutzdecke (biolayer at the top of the sand) where most bacteria removal takes place.  Lab experiments using a sand column tested for virus concentrations from  water sampled at 30cm below the surface of the sand.


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