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In the last three decades, many food production phases and most processing and marketing phases became detached from traditional farm operations and consolidated into the modern food industry which now represents the largest manufacturing industry group in both the U.S. and Canada (15, 17). This industrial concentration created serious emission control problems for many food enter prises, especially since the land basis for traditional disposal of waste materials is no longer available (8, i9). Many waste materials in the food industry have a sufficiently high nutrient concentration to be marketed as by products. Examples are feedstuffs obtained from processing of oil crops, sugar beet refining or beverage production. Other waste compounds consist of slurries with a rather low content of carbohydrates and proteins. Their concentration is generally too high for release into the public water system without expensive treatment. At the same time, it is too low for an economically feasible dehydration process to recover the nutrients for feeding or fertilizing purposes. If, however, the waste product could be dehydrated and marketed, and the drying process would not cost more than the required treatment for pollution control, then the sales returns would give an advantage to the recovery process.
high-temperature drying of animal waste
Meiering, A.G., Hesse, F.B., Rudgers, L.A. and J. Walker 1975. HIGH-TEMPERATURE DRYING OF ANIMAL WASTE. Canadian Agricultural Engineering 17(2):75-80.
75 - 80