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Bio-acidification and enhanced crusting as an alternative to sulphuric acid addition to slurry to mitigate ammonia and greenhouse gases emissions during short term storage
Publication . Prado, Joana; Chieppe, João; Raymundo, Anabela; Fangueiro, David
Several solutions are today proposed to farmers to minimize ammonia (NH3) emissions during storage. In
the present study, special attention was given to slurry acidification and slurry crust enhancement and
our objective was to assess the effect of slurry bio-acidification using sugar and cheese whey as an
alternative to sulphuric acid, and the potential of rice bran as crust enhancer on NH3 and greenhouse
gases emissions during storage. Both the cheese whey and the rice bran are materials, available in large
amounts, with low commercial value in some EU regions as Portugal and its use, at farm scale, will be a
win-win situation. Sugar is also a good alternative to acid attending its relatively low value. A laboratory
experiment was performed for 2 months with five treatments: non-treated cattle slurry (CTRL), slurry
treated with sulphuric acid (ACID), slurry treated with sugar (SUGAR), slurry treated with cheese whey
(WHEY) and rice bran applied on the slurry surface (RICE). The SUGAR treatment led to a reduction of
NH3 emissions by 45% relative to CTRL while WHEY and RICE resulted in a reduction of 68% and 25%,
respectively. Nevertheless, this effect of SUGAR and WHEY was shorter than in ACID, since NH3 emissions
started to be observed in those 2 treatments after 31 and 35 days of storage, respectively. Nitrous oxide
emissions remained close to zero in ACID and SUGAR. RICE led to the highest emissions of carbon dioxide
(CO2) releasing almost 5% of carbon present in the initial mixture (slurry þ rice bran) and presented the
highest methane emissions. The ACID and SUGAR led to a significant decrease of the total greenhouse gas
(GHG) emissions. Our results indicate that bio-acidification using a source of sugar could be a good
alternative to H2SO4 to reduce simultaneously NH3 and GHG emissions during storage
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Fundação para a Ciência e a Tecnologia
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3599-PPCDT
Número da atribuição
149983