Sustainable management of lignocellulosic wastes: Temperature strategies for anaerobic digestion of artichoke

JOURNAL OF CLEANER PRODUCTION

卷:280

Article

de Diego-Diaz, Beatriz¹  Penas, Francisco J.¹  Fernandez-Rodriguez, Juana¹ 

[1] Univ Navarra, Sch Sci, Dept Chem, E-31009 Pamplona, Spain

关键词: Artichoke waste;    Efficient waste elimination;    Biomethanation;    Temperature strategy;    Temperature-phased digestion;    Kinetic modelling;   

DOI  :  10.1016/j.jclepro.2020.124479

来源: Elsevier

【 摘 要 】

Lignocellulosic residues are a widely available energy resource, but their conversion into biogas through biomethanation may be hindered by a chemical structure with strong bonds. A strategy based on temperature-phased anaerobic digestion (TPAD) is here applied to optimize anaerobic digestion of artichoke as a representative lignocellulosic waste. The experiments consist of a first thermophilic stage conducted at 55 degrees C (7 and 5 days), followed by a second mesophilic stage at 35 degrees C. In addition, for comparison, single-stage temperature trials are carried out within the most common conditions for biomethanation (mesophilic at 35 degrees C, and thermophilic at 55 degrees C), as well as at the intermediate range (42 degrees C). In general, biomethanation of artichoke residues under TPAD configuration provides better performance than single-stage systems. Particularly, the best performance is observed for the TPAD arrangement using a thermophilic phase of 7 days. Thus, at this optimal configuration, volatile solids (VS) removal of 54%, and biogas and methane yields of 442 mL/g-VS and 375 mL-CH4/g-VS were reached, respectively. Moreover, a kinetic model coupling biogas generation and substrate consumption has been applied. Good agreement is found for both variables in each system tested. The calculated non-biodegradable substrate (S-infinity) is lower in TPAD systems (mean 49.6%) compared with that of single-stages (average 53.9%). The maximum specific growth rate of biomass (mu(M)) is higher for TPAD digesters (mean 0.0625 d(-1)), although the thermophilic single-stage reactor reaches a close value (0.0615 d(-1)). The biogas yield (alpha) is similar for all conditions (0.358 L/g-VS), but with a maximum value of 0.428 L/g-VS for the TPAD digester with the 7-days thermophilic period. Therefore, temperature-phased anaerobic digestion has proved to be an efficient strategy for sustainable management of artichoke wastes. (C) 2020 Elsevier Ltd. All rights reserved.

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