Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 1, Pages 200-206Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.06.146
Keywords
Chlorella vulgaris; Microalgae; Anaerobic digestion; Methane production; Nitrogen mineralisation
Funding
- French National Research Agency [ANR-08-BIO-E11]
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The main goal of this present study is to investigate the feasibility of coupling algae production (Chlorella vulgaris) to an anaerobic digestion unit. An intermediate settling device was integrated in order to adapt the feed-flow concentration and the flow rate. Digestion of C. vulgaris was studied under 16 and 28 days hydraulic retention times (HRT), with a corresponding organic loading rate of 1 g(COD) L-1. Increasing the HRT achieved 51% COD removal with a methane production measured at 240 mL g(VSS)(-1). Performing different HRTs and dynamic monitoring during degradation highlighted differential hydrolysis of microalgae compartments. However, 50% of the biomass did not undergo anaerobic digestion, even under long retention times. This points out the interest for further studies on pre-treatment performances and more generally speaking on the need for intensifying microalgae biomass digestion. (C) 2010 Elsevier Ltd. All rights reserved.
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