This report describes all existing methods of treatment of solid, low and intermediate level radioactive waste: mechanical, thermal, melting, chemical, biological and photochemical processes; both established proven technologies and advanced methods. It further discusses the treatment of generated liquid, solid and gaseous secondary waste. Comprehensive references on the subject are also given. Contents: 1. Introduction; 2. Waste treatment objectives and strategies; 3. Sources and types of waste; 4. Pretreatment of solid radioactive waste; 5. Mechanical treatment; 6. Thermal treatment processes; 7. Melting and sintering processes; 8. Chemical, biological and photochemical treatment processes; 9. Decontamination of equipment and components; 10. Conditioning of processed primary wastes; 11. Secondary waste treatment.