Phosphorus transformation in pig slurry due to diet and continuous aeration treatments

Q. M. Yang, S. K. Baidoo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The experiment was conducted to study the transformation of phosphorus (P) in slurry from pigs fed two different diets, a regular corn soybean meal diet with or without supplementation of 40% soybean hulls (SBH). The slurry was collected and treated either without aeration or continuous aeration at an airflow rate of 0.5 1/m 3/s for 21 days. Two slurries and two treatments constituted a 2 × 2 factorial design. The slurry was sampled and measured on days 1, 2, 3, 4, 7, 14, and 21. Results indicated that the pH of aerated slurries was increased (P < 0.01) by 0.9 unit within 24 hours, but the pH of non-aerated slurries was unchanged. Aeration decreased total inorganic P, insoluble inorganic P, and soluble P, but increased organic P by approximately 163 mg/1. The average organic P in the slurry from both diets with aeration was about 34% higher than that in the same slurry without aeration. Aeration decreased insoluble inorganic P by about 10.6% and soluble P by about 4.2%. The mass balance of P fractions showed transformation of insoluble inorganic P into organic forms during the aeration stage. The insoluble inorganic P takes about 68% of the total P in the slurry, so it is essential to perform solid-liquid separation prior to aeration to enhance the efficiency of soluble P removal because insoluble inorganic P is mainly contained in the slurry solids.

Original languageEnglish (US)
Title of host publicationLivestock Environment VII - Proceedings of the Seventh International Symposium
EditorsM.J. Briggs, M.E. McCormick
Pages316-326
Number of pages11
StatePublished - Dec 1 2005
EventLivestock Environment VII - 7th International Symposium - Baltimore, MD, United States
Duration: Oct 20 2004Oct 22 2004

Publication series

NameLivestock Environment VII - Proceedings of the Seventh International Symposium

Other

OtherLivestock Environment VII - 7th International Symposium
CountryUnited States
CityBaltimore, MD
Period10/20/0410/22/04

Keywords

  • Phosphorus removal
  • Pig slurry

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