Memorias de investigación
Artículos en revistas:
Thermogravimetric analysis and carbon stability of chars produced from slow pyrolysis and hydrothermal carbonization of manure waste
Año:2019
Áreas de investigación
  • Ciencia del suelo
Datos
Descripción
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
Si
JCR del ISI
Si
Título de la revista
Journal of Analytical And Applied Pyrolysis
ISSN
0165-2370
Factor de impacto JCR
3,468
Información de impacto
Datos JCR del año 2017
Volumen
DOI
10.1016/j.jaap.2019.04.026
Número de revista
140
Desde la página
434
Hasta la página
443
Mes
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Participantes
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  • Creador: Departamento: Ingeniería Geológica y Minera