Why would you want to install a disposal system? Why would you want to put added gunk into your drainfield. I should think that will help contribute to clogged holes in the pipes later on and maybe even a failed system and THEN you'll have a big stainless steel tank in your front yard that will need to be emptied every week. Why not just throw the stuff in the trash? You have trash anyway don't you? And trash removal, or you go to the county dump?