7981 Waste treatment (0) Installations for macerating, disinfecting and sterilizing waste 7982 Waste compaction (2) An installation for the cutting, shredding and compaction of waste prior to treatment or disposal 7983 Waste incineration systems (0) An installation for the destruction of waste materials by combustion, with or without heat-recovery provisions 7984 Unit incinerators (0) Small unit incinerators, using gas or electricity as the heat source, for the destruction of small items