Evaluation of inoculum acclimatation and biochemical seasonal variation for the production of renewable gaseous fuel from biorefined Laminaria sp. waste streams

RENEWABLE ENERGY

卷:139

Article

Tedesco, S.^1,3  Daniels, S.² 

[1] Dublin City Univ, Dept Mech & Mfg Engn, Dublin 9, Ireland

[2] Dublin City Univ, Dept Elect Engn, Collins Ave, Dublin 9, Ireland

[3] Manchester Metropolitan Univ, Sch Mech Engn, Dept Mech Engn, Dalton Bldg,Chester St, Manchester M1 5GD, Lancs, England

关键词: Laminaria hyperborea;    Seasonal variation;    Integrated biorefinery;    Methane potential;    Acclimatation;    Anaerobic digestion;   

DOI  :  10.1016/j.renene.2019.02.057

来源: Elsevier

【 摘 要 】

Laminaria. sp. seaweeds have been recognised the potential to greatly contribute to the generation of renewable gaseous fuel via anaerobic digestion. Seaweed feedstock has been documented to consistently vary its biochemical composition with seasons, which affects stability of biomethane production. As currently seaweeds are too costly for use as third generation feedstock for biofuels, this paper investigates the biogas potential of the algal waste streams from the existing bio-industry. Analytical tests identified an improved digestibility of extracted residues (C:N > 20). Fermentation with and without inoculum acclimatation revealed the interaction between compositional seasonality and inoculum type to significantly affect methane production from the extracted samples. Summer's composition has the most significant impact on methane production, with best results achieved with acclimatised inoculum (433 ml CH4 gVS(-1) and final biodegradation of about 90%). Organics concentration (tCOD) and ash:volatile (A:V) ratio also play a major role in the bioconversion process. In particular, digestion with acclimatised inoculum better responds to A:V fluctuations across seasons, which produced the highest average methane yield of 334 ml gVS(-1). Pretreatments are required to increase the biodegradation index in spring and summer when not using acclimatation. (C) 2019 Elsevier Ltd. All rights reserved.

【 授权许可】

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