Descripción
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Largeamountsofmanurewasteareproducedworldwide.Landapplicationofmanurewasteisthemostcommon approach to valorization. This practice has several environmental concerns, including pathogen spreading, emissions of odorous chemicals (ammonia or methane) and the pollution of waterbodies with nitrogen and phosphorouscompounds.Thepyrolysisofmanureforbiocharproductionhasbeentestedasausefultreatment to avoid these concerns but the high moisture of some wastes hinders its thermo-chemical valorisation in the absence of apre-drying step.Recently,hydrothermal carbonization (HTC) of wet biomass has been identified as a cost-effective valorisation method of biomass without the need for energy-intensive drying processes. The objectiveofthisstudyistocomparethepropertiesofpyrocharsandhydrocharspreparedfromthermaltreatment of rabbit manure (MW). Pyrochars were prepared at 450°C (BMW450) and 600°C (BMW600) and hydrochars were obtained using a rabbit manure solution (solid:water ratio 30:70) that was heated at 190°C (HMW190) and 240°C(HMW240).The final temperature was maintained during 1h for pyrochars and 6h for hydrochars. Results showed that HTC generated more micro-,meso-and macro-porosity than pyrolysis. Pyrochar produced at 600°C possessed a high thermal, chemical and biological stability, probably due to its highly aromatic structure. Hydrochars (HMW190 and HMW240) were predominantly aliphatic,and this was associated to a lower chemical and thermal stability than pyrochars. The germination index values indicated that the pyrochar BMW450 and the two hydrochars were highly phytotoxic while pyrochar MWB600 presented a moderate phytotoxicity,which was lower than the manure waste.Finally,CO2 emissions of different materials after 60 days followed the order: MW > HMW190>HMW240 > BMW450 > BMW600. Specifically, pyrolysis evolved CO2 was reduced between 97.8?88.7% with respect to raw material after pyrolysis. The HTC treatment diminished evolved CO2 between 68.8?59.0%,with respect to the manure.These results indicate that both processes can be considered as carbon fixation technologies. | |
Internacional
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JCR del ISI
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Título de la revista
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Journal of Analytical And Applied Pyrolysis |
ISSN
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0165-2370 |
Factor de impacto JCR
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3,468 |
Información de impacto
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Datos JCR del año 2017 |
Volumen
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DOI
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10.1016/j.jaap.2019.04.026 |
Número de revista
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140 |
Desde la página
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434 |
Hasta la página
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443 |
Mes
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MAYO |
Ranking
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