Wastes have no value, its definition implies so: scrap m. 1 excess of something after you have chosen the best or what can be used: the egg shell is scrap, we only eat the white and yolk. 2 Thing that pulls useless: "Put food scraps in trash ". You have to add that there are waste that must be treated with care, as hazardous biological waste, that occur in hospitals and clinics.
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