Tire-Derived Aggregate as Landfill Gas Collection Application
The California Integrated Waste Management Board (CIWMB) (now the Department of Resources Recycling and Recovery, or CalRecycle) and the County of Riverside Waste Management Board partnered to demonstrate the potential beneficial use of tire-derived aggregate (TDA) as a substitute for gravel in the gas collection system at the Badlands Sanitary Landfill located in Riverside County.
This project incorporated approximately 275 tons of Type A TDA as a substitute for gravel in three horizontal gas collection trenches, and is being compared with two conventional gravel-filled gas collection trenches that were constructed at the same time.
The trenches were excavated and approximately six inches of TDA was placed on the bottom of the trenches as a base material for the gas collection pipe.
After the pipe was in place, an additional 12 inches of TDA was placed over the pipe. The TDA was then covered with a geotextile material and cover soil was placed to fill the remaining portion of the trench.
Flow data comparing the gravel and TDA trenches indicated that the TDA “hydraulically” performs as good or better than typical gravel trenches. Gas constituent analysis performed indicates that the TDA trenches perform the same or better than typical gravel gas collection trenches.