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Use of Zinc Oxide Nanoparticles to Control Hydrogen Sulphide, Ammonia and Odour Emissions from Pig Barns

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

Citation:  2012 IX International Livestock Environment Symposium (ILES IX)  ILES12-1507.(doi:10.13031/2013.41577)
Authors:   Bernardo Z Predicala, Alvin Alvarado, Daisy Asis
Keywords:   Air quality, Ammonia, Hydrogen Sulfide, Nanoparticles, Odor, Swine

Application of zinc oxide (ZnO) nanoparticles was evaluated as a possible measure to mitigate the levels of hydrogen sulphide (H2S), ammonia (NH3) and odour from manure slurry in pig production facilities. Two deployment techniques were investigated: direct mixing of ZnO nanoparticles into the manure slurry, and filtration with ZnO nanoparticles as filtering media for the manure gases. Room-scale experiments conducted in controlled-environment chambers showed that mixing ZnO nanoparticles into the manure achieved more than 95% reduction in peak H2S levels while no significant effects on NH3 concentrations were observed. Zinc oxide nanoparticles were persistent in maintaining low H2S levels up to 15 days after treatment application. On the other hand, a filter system with ZnO nanoparticles installed in the ventilation air recirculation system achieved significant reduction in both H2S and NH3 concentrations at the animal- and human-occupied zones within the test chamber. Neither treatment had significant impact on pig performance and manure nutrient characteristics. Analysis of cost of application of the treatments in a 100-head grow-finish room revealed that employing air filtration method amounted to around 3.8% of the average total cost of production, while the mixing method was found to be cost prohibitive at about 40.2% of the average total production cost; various options can be pursued to further reduce the application cost.

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