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Advisor(s)
Abstract(s)
Biofilters are an effective air pollution control technology to break down gaseous contaminants
and produce innocuous end products. This laboratory study aimed to evaluate a biofilter
media, mainly composed by tomato waste, as packing material to reduce NH3, N2O, CO2 and CH4
losses from stored pig slurry. Three mixtures of packing materials, with and without oxalic acid,
were arranged in treatments, namely: mixture of tomato waste, pine bark and agricultural compost;
mixture of tomato waste and rice husk; tomato waste only. A control treatment (no biofilter) was also
included. The experiments were conducted using a system of laboratory scale biofilters connected to
jars filled with pig slurry and under a constant airflow rate. The gas concentrations were measured
for 14 days and the physicochemical of the packing materials were assessed. Results showed that
biofilter media mixtures had a potential for NH3 retention ranging from 51 to 77% and the addition
of oxalic acid to these biofilters increased NH3 retention to 72–79%. Additionally, the biofilter media
mixtures with and without oxalic acid showed a potential retention for CH4 (29–69%) but not for
N2O, yet with no impact on the global warming potential. It can be concluded that tomato based
biofilters had the potential to reduce gaseous emissions from slurry.
Description
Keywords
ammonia GHG emissions biofilter mitigation measure tomato waste
Citation
Pereira, J.L.S.; Perdigão, A.; Marques, F.; Coelho, C.; Mota, M.; Fangueiro, D. Evaluation of Tomato-Based Packing Material for Retention of Ammonia, Nitrous Oxide, Carbon Dioxide and Methane in Gas Phase Biofilters: A Laboratory Study. Agronomy 2021, 11, 360. https://doi.org/10.3390/agronomy11020360
Publisher
MDPI