Is it green to use your garbage disposal? After all, food waste is ground up and not thrown in the trash, where it's sent to the landfill, right? Unfortunately, using a garbage disposal is not the greenest way to get rid of food. All of the food sludge that is sent to the wastewater plant is actually collected and landfilled anyway. It's best to sort organic matter, like fruit and vegetable peels, for the compost bin and throw away food in the trash only when it's absolutely necessary. Skipping the garbage disposal will help you save money on water and electricity in the long run.