Abstract

PALACIOS-HUGO, Rosario; CALLE-MARAVI, José  and  CESARE-CORAL, Mary Flor. Stability analysis of biochar from agroforestry pruning. Acta Agron. [online]. 2022, vol.71, n.4, pp.377-387.  Epub Apr 11, 2024. ISSN 0120-2812.  https://doi.org/10.15446/acag.v71n4.94948.

Pyrolysis is a thermal decomposition process through which biochar is obtained, which is a component enriched in carbon. The difference between vegetal carbon and biochar is that the latter is exclusively a soil amendment that allows the management of lignocellulosic wastes. Likewise, biochar is considered an alternative to fix carbon from the atmosphere in the soil. This research evaluated the stability of biochar obtained through pyrolysis at 300 °C and 500 °C from the pruning waste of the five most abundant forest species from the National Agrarian University - La Molina (UNALM), Lima, Perú. This investigation evaluated the stability of the biochar based on the degree of stability and the standardized AT4 test. Regarding the degree of stability, it increased in a ratio of 0.102 when the pyrolysis temperature raised from 300 °C to 500 °C, likewise, the labile carbon decreased by 5.21 %, the oxidizable carbon by 13.66 %, while the recalcitrant carbon increased by 10.90 %. Regarding the spirometry test, a similar behavior was observed, since greater decomposition in the carbon that would have a lower degree of stability was noticed, varying the AT4 index by 2.74. Regarding the species, according to the degree of stability and the AT4, the most stable biochar was that of Molle 500 °C.

Keywords : biomass; clean energy; amendment; pyrolysis; reactivity.

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