Waste waters containing whey from the manufacture of cheese are notorious for causing waste treatment problems, whether treated alone or in conjunction with other wastes including domestic sewage. The purpose of the project was the development of activated sludge and biological filtration processes applicable to the treatment of whey-bearing wastes. The scope included the determination of mathematical models of process performance, the preparation of computer programs for process design, and the evaluation of methods for dewatering secondary sludges.