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The Low Flow Stacked Rapid Sand Filter team seeks to design and build a 30 cm diameter filter that will accurately model the filters being constructed in India by AguaClara, LLC and to use the existing 10 cm diameter filter to quantify the effects of incorporating a backwash initiator and to construct an improved sand drain. The 10 cm team has constructed a constant head device, run the filter, and determined that the backwash initiator does not actually aid in the initiation of backwash, and is in practice a fluidization indicator. The 10 cm team has also constructed an alternative sand drain, but has not yet utilized it. The 30 cm diameter team has constructed a filter column, an inlet tank, and an exit tank. They have developed and implemented new methods to assemble these components, and they have documented their progress to facilitate the construction of new filters.
Spring 2013
In January 2013, the Low Flow Stacked Rapid Sand Filter was tested in Honduras. Although the filter worked, it quickly failed due to structural weaknesses. The primary tasks this year included improving the durability of the filter and increasing the ease of operation. New manifold and sand drain designs are in the process of being implemented. Additionally, the stacked rapid sand filter went to Washington, D.C. in April for the EPA P3 competition. A written approval for the P3 grant was written and submitted. To demonstrate the design and effectiveness of the LFSRSF, a fully operational unit was designed. The prototype underwent hydraulic and performance testing and operated well at the competition.
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This system was tested in Honduras in January 2013.
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