Ukurisayikilisha kuya kukhula kubaluleke ngakumbi kwinkulungwane yama-21 ukunqanda inkunkuma kunye nokugcina okusingqongileyo. Iindidi ezahlukeneyo zemathiriyeli zinokuphinda zisetyenziselwe amandla, amafutha, ukubuyiswa kwemathiriyeli, ukunyangwa ngoomatshini bebhayoloji kunye nokuveliswa kwesamente, kubandakanywa ukurisayikilishwa kwenkunkuma eqinileyo kamasipala, ukurisayikilishwa kwenkunkuma yorhwebo kunye nemizi-mveliso, ukurisayikilishwa kwenkunkuma yokwakha nokudilizwa, ukurisayikilishwa kwe-slag, iplastiki kunye nokuvulwa kweengxowa. , iintsimbi zokurisayiklishwa kwephepha nekhadibhodi, inkunkuma eninzi yokurisayikilisha nezinye iintlobo ezininzi zenkunkuma.