Method of using waste tires as a filter media.U.S. patent: 6,969,469
Issued: November 29, 2005
Inventor: Yuefeng Xie
Assigned: The Penn State Research Foundation
Key statement: The crumb rubber Crumb rubber is generally manufactured from automotive and truck scrap tires. During the manufacturing process steel and fluff is removed leaving tire rubber with a granular consistency. media are compressible com·press·i·ble
That can be compressed: compressible packing materials; a compressible box.
com·press which allows the porosity between rubber particles to decrease through the filter bed. The crumb rubber media compress as headloss increases, allowing for better effluent quality late in the run, allow greater depth filtration, can be used at high filter rates greater than 20 gpm/ft. (2) and perform similarly to other traditional filter media in respect to turbidity turbidity /tur·bid·i·ty/ (ter-bid´i-te) cloudiness; disturbance of solids (sediment) in a solution, so that it is not clear.tur´bid
The cloudiness or lack of transparency of a solution. and total suspended solids Total suspended solids is a water quality measurement usually abbreviated TSS. This parameter was at one time called non-filterable residue (NFR), a term that refers to the identical measurement: the dry-weight of particles trapped by a filter, typically of a removal.