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Enclosed Stacked Rapid Sand Filters (EStaRS) are an adaptation of stacked rapid sand filters (StaRS) optimized for flows less than 3 L/s. SRSF is a game changing StaRS is an innovative technology invented by the AguaClara team that is significantly simpler to operate than conventional rapid sand filters. LFSRSF EStaRS are currently being built in AquaClara plants in India to treat flow rates of around 0.8 L/s. |
Fall 2016
The overall team goal for this semester is to design and fabricate a new EStaRS for use in the 1 L/s plant. The team aims to reduce the filter height and make improvements based on problems reported by previous teams, including issues with flexible tubing and the inability to visually confirm backwash fluidization. After researching the design and construction methods of the original EStaRS, the team will create an updated version using MathCAD and AutoCAD.
Spring 2016
This semester, the the team will be working to design a system to measure headloss in the filter during forward wash and find a way indicate if the bed if fluidized during backwash. At this point in the semester, a manometer system has been set up to indicate headloss in the entire tank and a way to measure fluildization in the sand layer. The rest of the semester, we will be researching the relationships within our data collection and implement our findings into the field. The team will also continue to test the filter's performance while running with PACL and clay to view how the filter would perform in similar field situations.
Fall 2015
The team's major goal this semester is to test and evaluate the new inlet system developed and installed last semester. This task includes operating the filter during forward filtration and during backwash to confirm the team's theory that the new orifices can replace the slotted pipes in the inlet manifolds. During testing, the team will be looking for movement of sand into the inlet manifolds and tubing and for successful back washing. If the inlets test successfully, the team will move onto continuing to make the filter easier to operate in the field, while developing a way to gauge how well the filter is fluidizing during backwash. If the inlet system proves problematic, the team will work with the FInE subteam to find a solution.
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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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