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Advisor(s)
Abstract(s)
: Slurry storage is a significant source of NH3 and greenhouse gas (GHG) emissions. The
aim of this laboratory study was to assess the effects of different chemical additives and biochars
on the emissions of NH3
, N2O, CO2
, and CH4 during the short-term storage of pig slurry. The
experiment was performed using Kilner jars filled with raw slurry as control and six treatment
additives (5% w/w): acidified slurry, alkalinized slurry, neutralized slurry, agroforestry biochar,
cardoon biochar, and elderberry biochar. The gas emissions were measured for 30 days, and the
composition of the slurries was determined. During short-term storage, the results of this laboratory
study indicated that the NH3 emissions were reduced by 58% by acidification and by 20% by the
biochars (Agroforestry, Cardoon, and Elderberry treatments), while neutralization reduced this
loss by only 12%. Nitrous oxide emissions were not reduced by the chemical additives (Acidified,
Alkalinized, and Neutralized treatments), while this loss was increased by 12% by the biochars.
Carbon dioxide, CH4
, and global warming potential emissions were not affected by the chemical
additives and biochars. Furthermore, the absence of differences between the biochars may be related
to their similar composition. Regarding the influence of the studied additives on NH3
losses, it can
be concluded that acidification was the best mitigation measure and the biochars were quite similar
due to their composition. Furthermore, neutralization had the advantage of sanitizing the slurry, but
only had a mild impact on NH3 preservation
Description
Keywords
animal slurry biochar chemical additive gaseous emissions mitigation measure slurry additive
Pedagogical Context
Citation
Pereira, J.L.S.; Perdigão, A.; Marques, F.; Wessel, D.F.; Trindade, H.; Fangueiro, D. Mitigating ammonia and greenhouse gas emissions from stored pig slurry using chemical additives and biochars. Agronomy 2022, 12, 2744.
Publisher
MDPI