This fluidised process seems very promising additions to the range of systems which can be used to up-rate existing sewage treatment plants, for denitrification, and to deal with industrial wastes. Because it retains such an active biomass within supporting particles, it will offer both aerobic digestion and anaerobic one. Concentrated sludges （5-7 % dry solids） may be produced for direct land disposal. The ability of this system is still to be tested in such aspects as cheaper and suitable particles and capability of handling both diurnal and storm flow. However it will show savings in total cost when compared with conventional system.