In laboratory studies, various processes were tried for further treatment of effluent from a laboratory scale activated sludge plant. Ion exchange has been utilized with different resins and in different configurations to remove nutrients, nitrogen and phosphorus, and also organic materials. A strong-base ion exchange resin, regenerated with chlorides, was the most successful. Phosphorus and color were removed by chemical coagulation using liquid alum and commercial ferric sulfate as coagulants. The effect of foam fractionation on ABS and COD removal and on the form of nitrogen was studied. In addition, nitrogen removal by a denitrification process was also studied. (Author)