We don't have a garage disposal. I haven't looked out right but, I don't think they are available here. At least I never noticed any for sale. No one I know has one either.
That said, very small amount of some of the things mentioned go do down the drain, most often that would be rice. Not a lot a few kernels here and there, like from rinsing off a plate. Any left over in the rice cooker are mixed up with other left overs and dog food for the dogs.
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