Biological carbon dioxide utilisation in food waste anaerobic digesters

WATER RESEARCH

卷:87

Article

Fernandez, Y. Bajon¹  Green, K.¹  Schuler, K.²  Soares, A.¹  Vale, P.³  Alibardi, L.⁴  Cartmell, E.¹ 

[1] Cranfield Univ, Cranfield MK43 0AL, Beds, England

[2] Ecole Natl Super Chim Rennes, F-35708 Rennes 7, France

[3] Severn Trent Water, Coventry CV1 2LZ, W Midlands, England

[4] Univ Padua, Dept Ind Engn, I-35131 Padua, Italy

关键词: Carbon dioxide utilisation;    Anaerobic digestion;    Food waste;    Hydrogen;    Bubble column;   

DOI  :  10.1016/j.watres.2015.06.011

来源: Elsevier

【 摘 要 】

Carbon dioxide (CO2) enrichment of anaerobic digesters (AD) was previously identified as a potential on-site carbon revalorisation strategy. This study addresses the lack of studies investigating this concept in up-scaled units and the need to understand the mechanisms of exogenous CO2 utilisation. Two pilot-scale ADs treating food waste were monitored for 225 days, with the test unit being periodically injected with CO2 using a bubble column. The test AD maintained a CH4 production rate of 0.56 +/- 0.13 m(3) CH4.(kg VSfed d)(-1) and a CH4 concentration in biogas of 68% even when dissolved CO2 levels were increased by a 3 fold over the control unit. An additional uptake of 0.55 kg of exogenous CO2 was achieved in the test AD during the trial period. A 2.5 fold increase in hydrogen (H-2) concentration was observed and attributed to CO2 dissolution and to an alteration of the acidogenesis and acetogenesis pathways. A hypothesis for conversion of exogenous CO2 has been proposed, which requires validation by microbial community analysis. (C) 2015 The Authors. Published by Elsevier Ltd.

【 授权许可】

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