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Soil Column Testing for Nutrient Reduction in Partially Treated Swine Manure

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:   No Citation available.
Authors:   Jian Xiao, Ian Buchanan, Mohamed Gamal El-Din

Liquid swine manure, pre-treated by physical and chemical methods to precipitate phosphorus and remove suspended solids, was applied to a series of soil columns. The soil columns simulated proposed nitrogen and organics processing area that would form part of an overall swine manure management system intended to reduce the land-base required to accommodate manure produced by large concentration animal feeding operations. The specific objectives of the study were to determine an appropriate manure application rate and to assess the soils ability to remove nitrogen and organic material from the partially treated liquid swine manure. Three groups of three soil columns were used. Each triad included a control and two treatment columns. Each triad received a different application rate (nominally 12, 25 or 50 mm/d) over an 8-week period. The higher application rates caused excessive pooling on the soil surface due to soil permeability limitations and the formation of a crust on the soil surface. The maximum effective application rate was found to be 20 mm/d (including precipitation), under the conditions tested. The mass removals of total phosphorus, total Kjeldhal nitrogen and chemical oxygen demand over the 8-week application period were 95%, 98%, and 50 to 80%, respectively. The lower COD removal was observed at the 25 and 50 mm/d application rates; however, application rate had little effect on nitrogen or phosphorus removal.

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