A two-stage processing of cherry pomace via hydrothermal treatment followed by biochar gasification

RENEWABLE ENERGY

卷:179

Article

Wadrzyk, Mariusz^1,2  Grzywacz, Przemyslaw¹  Janus, Rafal^1,2  Michalik, Marek³ 

[1] AGH Univ Sci & Technol, Fac Energy & Fuels, A Mickiewicza Av 30, PL-30059 Krakow, Poland

[2] AGH Univ Sci & Technol, AGH Ctr Energy, Czarnowiejska 36, PL-30054 Krakow, Poland

[3] Jagiellonian Univ, Inst Geol Sci, Gronostajowa 3a, PL-30387 Krakow, Poland

关键词: Cherry pomace;    Industrial waste valorization;    Hydrothermal treatment;    Biochar;    Gasification;    Sustainability;   

DOI  :  10.1016/j.renene.2021.06.130

来源: Elsevier

【 摘 要 】

Poland is the EU's largest producer of cherry, which largely is further processed. As a consequence, a problematic waste cherry pomace is generated as by-product. Among the new sustainable technologies for organic waste valorization particularly perspective are thermochemical methods, which can be divided into conventional one, i.e., dry route (e.g. pyrolysis, gasification) and wet route (i.e. hydro thermal treatment). Herein, we proposed a two-stage thermochemical processing route for the conversion of cherry pomace, i.e., hydrothermal treatment followed by CO2 gasification. Firstly, we transformed the feedstock into biochar via hydrothermal processing. The aim of this stage was to analyze the effect of processing temperature (200-350 degrees C) on the distribution of the yield of various groups of products. The residual biochar was obtained with the highest yield (33-57 wt%). Among the gas-phase products, the dominant constituent was CO2. The upgrading of the biochars through gasification with CO2 to ensure the sustainability of conversion was the subsequent step. The quality of the biochars was examined by infrared spectroscopy, proximate and ultimate analysis, SEM, and low-temperature nitrogen adsorption. The activation energy ranged between 668 and 732 kJ mol(-1) for the gasification of the biochar prepared at 275 and 200 degrees C, respectively. It was found that biochars produced at different conditions exhibit various properties as a result of gradual degradation of the original components of the raw material and increase in aromaticity occurring with the increase in the processing temperature. (C) 2021 The Authors. Published by Elsevier Ltd.

【 授权许可】

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