I hope you have a mud room to take off your shoes before walking on carpets and floors in the house. Small amounts will tansfer and over time black carpet are impossible to clean.

You could also use rice hulls. It will make your garage look like a barn, but will do the trick.

Rice hulls are used to trap the oil in water. After skimming the hulls the water can even be drinkable.

I believe that disposing of these oily bricks in a very hot fire would be good. Recover the fuel value, and emit very little bad stuff.

This is better than the endless series of old, flattened cardboard boxes we have used for 60 years. When I was a kid, I suggested a shallow metal dish with a pump, under the engines of old English cars to recycle the oil drippage (filtered of course!).

You know all the fuss about how much greenhouse gas each of us causes? Movie stars pretending that paying a tree-planter offsets regular use of an airliner... The only time I worry about my carbon footprint is when it is on a light-colored carpet!

Now we just contaminate biomass that could have been return to the soil to improve it. Then using other waste like paper that could be made into a mat and preform just as well.

The farmer will just have to apply more chemical fertilizer for the loss. Burn more fuel as the soil will be firmer. Water more often as it will not retain moisture as well. So I hope the farmers that are providing this so called waste are being well paid for it.