It is indicated that the two-sludge process is superior to the conventional treatment process in the aspects of effluent quality, capital investment, operating cost, and operational management, and so it is appropria.

Analysis on operational parameters of several two-sludge systems in the condition of low C/N;

A study on the characteristics of phosphorus accumulating organisms(PAOs) in an anoxic tank of continues-flow two-sludge system was carried out using plate isolation method,physiological and biochemical experiments and phosphorus uptake experiment.

For the purpose to resolve the contradictions that existed in conventional phosphorus and nitrogen removal process, enhance the study of denitrifying phosphorus removal, and promote the application of two-sludge system, lab scale of two-sludge process for treating municipal sewage has been run for a long term.

A tentative idea of adding media into the aeration tank or using a two-sludge system for phosphorus and nitrogen removal is put forward to promote denitrification in aeration t.

To select conditioner for the process of thickening residual activated sludge from Chaoyangzhou Wastewater Treatment Plant in Nanchang by cavitations air floatation (CAF), some conditioning experiments were done by dual conditioners.