Ọfịs nke recycling International (BIR) dọtara uche na mkpofu ihe ndị sitere n'okike sitere n'okike ma mesie ọrụ dị mkpa nke nrụgharị ọzọ. Ozi di nkpa: agbakwunyela uzo nke abuo n’ime ihe akaghi aka isii - mmiri, ikuku, mmanu mmanu gas, mmanu na mmanu - ihe eji emeghari. Inine eji ngwaahịa na nkwakọ ngwaahịa chọrọ.