Abstract: At present, the research development work is concentrated on saving energyContinued on p.84) Continued from p.71)and raising efficiency. It is important to reduce the amount of liquid wastes as much as possible, to collect and treat them separately in accordance with radioactivities and compositions of liquid wastes.Evaporation, ion-exchange and filtration have been widely used in the treatment of liquid wastes.In the field of solidification, research and development activities are focused on developing processes with high volume reduction and better performance.Cementation and bitumenization methods are being developed.Under favorable geological condition, the option integrating solidification with disposal, owing to its simplified operation and low cost has been given great attention in some countries.