Chemical Evaluation of Odor Reduction by Soil Injection of Animal Manure
- Anders Feilberg Tavs Nyord *a,
- Martin Nørregaard Hansenb and
- Sabine Lindholstc
- a A. Feilberg and T. Nyord, Dep. of Biosystems Engineering, Faculty of Science and Technology, Aarhus Univ., Blichers Allé 20, 8830 Tjele, Denmark
b S. Lindholst, Center for Chemistry and Water Technology, Danish Technological Institute, Kongsvang Allé 29, 8000 Aarhus, Denmark
c M.N. Hansen, Agrotech–Institute for Agri Technology and Food Innovation, Udkaersvej 15, 8200 Aarhus N, Denmark. Assigned to Associate Editor Sean McGinn
Field application of animal manure is a major cause of odor nuisance in the local environment. Therefore, there is a need for methods for measuring the effect of technologies for reducing odor after manure application. In this work, chemical methods were used to identify key odorants from field application of pig manure based on experiments with surface application by trailing hoses and soil injection. Results from three consecutive years of field trials with full-scale equipment are reported. Methods applied were: membrane inlet mass spectrometry (MIMS), proton-transfer-reaction mass spectrometry (PTR–MS), gold-film hydrogen sulfide (H2S) detection, all performed on site, and thermal desorption gas chromatography with mass spectrometry (TD-GC/MS) based on laboratory analyses of field samples. Samples were collected from a static flux chamber often used for obtaining samples for dynamic olfactometry. While all methods were capable of detecting relevant odorants, PTR–MS gave the most comprehensive results. Based on odor threshold values, 4-methylphenol, H2S, and methanethiol are suggested as key odorants. Significant odorant reductions by soil injection were consistently observed in all trials. The flux chamber technique was demonstrated to be associated with critical errors due to compound instabilities in the chamber. This was most apparent for H2S, on a time scale of a few minutes, and on a longer time scale for methanethiol.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © 2011. . Copyright © by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Inc.