Odors from evaporation of acidified pig urine

H.C. Willers, P.J. Hobbs, N.W.M. Ogink

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

    Abstract

    In the Dutch Hercules project feces and urine from pigs are collected separately underneath the slatted floor in a pig house and treated in two processes. Feces are composted and urine is concentrated by water evaporation in a packed bed. Exhaust air from the pig house is used for the evaporation in a packed bed scrubber. Before entering the scrubber, urine is acidified with nitric acid to retain ammonia in the liquid and to absorb ammonia from the air. In this way a concentrated nitrogen/potassium fertilizer is produced from pig urine and ammonia is removed from the pig house exhaust air. Odor in the air inlet and the exhaust of the pig urine scrubber was measured using gas chromatography mass spectrometry (GC-MS) and olfactometry. The measurements were made weekly during six weeks in a pig fattening round where operation of the Hercules system was tested under pilot conditions. The olfactometric odor concentration of the scrubber inlet air averaged 2,290±1,760 OUE /m3 and the outlet concentration averaged 3,860±3,270 OUE /m3. When one measurement with a very high outlet concentration (10,320 OUE /m3) was ignored, a paired one-sided t-test (p
    Original languageEnglish
    Title of host publicationAir Pollution from Agricultural Operations III : Proceedings of the 12-15 October 2003 Conference
    Place of PublicationResearch Triangle Park
    PublisherASAE
    Pages318-322
    Publication statusPublished - 2004

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