the household waste treatment requires neither incineration nor disposal in landfills . two processing sub - systems , first one for combustibles and the other or second one for incombustibles , cooperate with each other as a single system for recycling the waste . the first sub - system deals with combustible waste to yields products for fertilizing and / or conditioning soil . in the process , what are inappropriate to the production of the soil fertilizing and / or conditioning products are sent to the second sub - system , which deals with incombustible waste . this sub - system sorts the incombustible waste materials into various kinds of recyclable products . combustibles among the incombustible waste materials are sent to the first sub - system .