My water quality students in ENVH 568 built these sand filters for a class requirement. They are now up and running in the LLU Environmental Microbiology Research Laboratory. We will use them for some class activities in the ENVH 569 sampling class.
|We dry-fit the pieces together in the hardware store. This is where the students realized that there are many possible combinations.|
|Students discovered that there were a few possible combinations of diffuser pipes and spout exit styles. Our class built five filters with varying construction.|
|All filters had about 2 inches of 3/4" gravel around the pipes with another 2 inches of pea gravel on top of that (1/4" gravel). Those were separated by a cloth to minimize sand going into the gravel and then the bottom diffuser pipe.|
|Sand was added on top of that until it was about 2" below the spout. Our filters tested varying heights.|
|There were 5 filters built and are now hooked up to a recirculating water system. They will be tested for arsenic and E.coli removal in our ENVH 569 class.|