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REDUCING AMMONIA EMISSIONS BY COMBINING COVERING AND ACIDIFYING LIQUID MANURE

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

Citation:  Pp. 174-182 in Air Pollution from Agricultural Operations III, Proceedings of the 12-15 October 2003 Conference (Research Triangle Park, North Carolina USA), Publication Date 12 October 2003.  701P1403.(doi:10.13031/2013.15509)
Authors:   W. E. Berg
Keywords:   animal husbandry, emission, ammonia, methane, nitrous oxide, odor, liquid manure, cover material, lactic acid

Emissions from animal husbandry can be reduced by covering storage facilities as well as by lowering the pH value of the liquid manure. Investigations on several cover materials and on acidifying liquid manure with lactic acid led to the idea to combine both effects – covering and acidifying liquid manure, to reduce emissions more effectively. Investigations were carried out with granule combined with lactic acid or with saccharose at lab-scale in storage containers with 65 l liquid swine manure, respectively. They were compared with trials made with nothing but granule and an uncovered control sample. The layer thickness of the covered samples was 6 cm. Gaseous emissions (NH3, N2O, CH4) and odor were measured. The pH value of the liquid manure below the surface and above the ground, the dry matter, ammonium, and total nitrogen content of the liquid manure were determined. The combination of a perlite with lactic acid lowered the pH value of liquid swine manure below the surface more than that above the ground. The combination reduced the pH value with a lower amount of acid than acidification without cover material.

All samples reduced ammonia and a little bit lower also methane emission effectively, except for the samples with saccharose. The samples with lactic acid or saccharose could avoid nitrous oxide emission, contrary to the granules customarily in trade.

None of the investigated samples reduced odor emission during the whole storage period. (Download PDF)    (Export to EndNotes)