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Decomposition in Soil of Waste Cooking Oils Used in Potato Processing¹

ABSTRACT

Cooking oils used in potato processing are sometimes wasted in small quantities into the effluent that goes to land disposal. To determine the effect of this oil on land, palm and soybean oils were added to Portneuf silt loam at rates of 0.1, 0.5, 1.0, and 5.0 g oil in 100 g soil (2.2, 11.2, 22.4, and 112 metric tons/ha, respectively). Nitrogen was added and the mixtures were incubated at constant temperature in a CO₂-free continuously flowing air stream. Evolved CO₂ was scrubbed from the air stream and decomposition calculated. Both oils decomposed at the same rate at each application rate. Maximum weekly decomposition was approximately 8 and 2.5 metric tons/ha for the 112 and 11.2 metric ton-applications, respectively. There was no evidence for toxicity to the decomposition systems with the high application of oil and no evidence that difficulty would develop with land disposal of wastes containing these edible cooking oils.

Key Words: nitrate • N immobilization • pollution control • land treatment

¹ Contribution from the Western Region, Agricultural Research Service, USDA; University of Idaho, College of Agriculture Research and Extension Center cooperating. This research was supported in part by a grant from the Potato Processors of Idaho Association, Inc. and the Idaho Potato Commission.

² Soil Scientist, Snake River Conservation Research Center, Kimberly, Idaho 83341.

Received for publication September 19, 1973.

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