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Addition of nanoparticles and biochar to agricultural waste composting: effects on composting process and CO2-CH4 emissions

AuthorsMedina, Jorge; Knicker, Heike ; Felipe, Pradel; Calabi-Floody, Marcela; Meier, Sebastián; Paneque Carmona, M. ; Cornejo, P.; Borie, F.
Issue Date26-Jun-2019
PublisherInternational Union of Soil Sciences
Citation8th ISMOM - International Symposium on Interactions of Soil Minerals with Organic Components and Microorganisms (Abstract number: A 5.21) pág. 190-191 (2019)
AbstractLittle is known about the impact of inorganic nanoparticles as additives in composting systems. The objective of this research was to evaluate the effects of iron oxide/halloysite nanoparticles and biochar as additives in the main physical and chemical properties and greenhouse gas (GHG) emissions of agricultural waste composting. Wheat straw and beef manure were mixed (2:1 w/w; C/N: 25) and co-composted with iron oxide (CFe) and halloysite (CHa) nanoparticles (2% w/w) oat-biochar (CB) (7% w/w) and their combination (CBFe CBHa). Changes in pH and EC organic matter (OM) losses NH4-NO3 concentration C/N and E4/E6 ratio and the emissions of CO2 and CH4 were analyzed. Additionally the initial mixtures and end-products were characterized by nuclear magnetic resonance (13C NMR). Additives slightly affected pH (final pH about 8.0) and increased the electroconductivity of mixtures. Nanoparticles biochar and their combination reduced the OM and C losses (about 15%) compared to control without additives. A decrease of C/N ratio between initial and end-products were also observed in all treatments and lower differences were observed in treatments with additives. Nitrate concentration increased as composting progressed. CHa showed the higher mean concentration of NO3 (2500 mg kg-1) and NH4 (120 mg kg-1). Conversely CBFe and CBHa showed the lower mean concentration of NH4 (60 mg kg-1). Nanoparticles significantly decreased the final E4/E6 ratio (<6) and the addition of biochar and its combination with nanoparticles increased the aromaticity (twice) the alkyl-C/O alkyl-C ratio and the hydrophobicity which are parameters associated to stabilized end-products. Clear relative diminution of O alkyl-C region (50%) associated to carbohydrates was observed in treatments with additives suggesting an active composting process. Furthermore the addition of biochar (CB) significantly decreased the mean emission of both CO2 (~400 g CO2 m2 d-1) and CH4 (4.5 g CH4 m2 d-1) during the process. These results suggest that the addition of iron oxide/halloysite nanoparticles biochar and their combination as co-composting additives had important effects on composting process GHG emissions and chemical composition of the end-products.
DescriptionComunicación oral presentada en el ISMOM 2019 - 8th International Symposium on Interactions of Soil Minerals with Organic Components and Microorganisms: (Abstract number: A 5.21), 23-28 june, Sevilla (Spain)
Appears in Collections:(IRNAS) Comunicaciones congresos
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