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Enclosed Stacked Rapid Sand Filters are an adaptation of rapid sand filters optimized for flows less than 3 L/s. SRSF is a game changing technology invented by the AguaClara team that is significantly simpler to operate than conventional rapid sand filters. LFSRSF are currently being built in AquaClara plants in India to treat flow rates of around 0.8 L/s. |
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.
Spring 2014
This semester, the team aims to complete fabrication of the 30 cm diameter LFSRSF, which includes a simplified hydraulic control system. The team will add slotted pipes and sand to the filter column, as well as pipe stubs to the inlet and outlet tanks. They will also build a water recycling system to facilitate hydraulic testing of the filter. Testing will involve evaluating the headloss necessary to fluidize the sand bed of the filter during clean and clogged conditions, determining the head required to initiate backwash, and measuring the flow distribution between filter layers. The team will also simplify the sand drain design and and develop a better method to open and shut it. Finally, the team will optimize pipe sizes and elevation of the inlet and outlet tanks to improve access and efficiency.
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