To produce the canning industry's annual nationwide pack of 760 million cases of canned foods, more than 36 billion gallons of water is required. In comparison with domestic sewage, food processing wastes are much higher in pollutional strength. Thus the research described discusses the designing of larger-scale experimentation treatment of food processing wastes. Objectives of the project were as follows: To develop information on the effectiveness of treating strong liquid wastes with a high-rate trickling filter; To evaluate under cannery conditions the effects of controlling, by the addition of edible acids, the sanitary condition of waters recirculated in product pumping and fluming systems, and to determine if the total organic waste load discharged; To determine the effectiveness of air-flotation systems for removing suspended solids; To evaluate the performance of center-discharge, fine-screen separators in removing suspended solids; and To select, on the basis of results obtained, a system or systems to be enlarged in scale. (Author)