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Journal of Dairy Science Vol. 64 No. 11 2251-2257
© 1981 by American Dairy Science Association ®
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Nutrient Distribution and Retention during Winter Storage of Animal Wastes in Two-Stage Simulated Systems as Affected by Aeration and Buffering1

F. R. Murdock,, A. S. Hodgson,, M. H. Ehlers and D. F. Bezdicek

Departments of Animal Science and Agronomy and Soils, Washington State University, Western Washington Research and Extension Center, Puyallup 98371

ABSTRACT

Six two-stage animal waste storage simulators were designed, constructed, and used to measure the distribution and retention of nutrients during winter storage of liquid animal wastes from a dairy herd. Effects of surface aeration and pH buffering plus aeration on nutrient distribution and retention were determined.

Nutrients retained during simulated untreated (control) storage were total solids 99%, volatile solids 97%, total nitrogen 89%, and ash 100%. Aeration increased degradation of volatile solids but did not reduce total nitrogen retention appreciably in unbuffered systems. Aeration increased transfer of soluble nutrients to the low-solid stage. Buffering of waste at a pH from 6 to 7 with phosphoric acid effectively retained nitrogen in a system in which mild aeration was applied to the high-solid stage. From 30 to 42% of the total nitrogen was recovered in the second low-solid stages demonstrating the significance of the liquid phase as a valuable fertilizer resource for irrigation. Appreciable synthesis of protein by microflora apparently occurred through utilization of ammonia as a nitrogen source in the nonbuffered system.

Odor intensity indexes of liquids in the surface layer were reduced by aeration of that layer. Oxidation-reduction potentials appear to be a reliable indication of degree of malodor production.

FOOTNOTES

1 Scientific Paper No. 5804. College of Agriculture Research Center, Washington State University, Pullman 99164. Project No. 0241.






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Copyright © 1981 by the American Dairy Science Association ®.