Phytoremediation of bark-hydrolysate fermentation effluents and bioaccumulation of added-value molecules by designed microalgal consortia

Beigbeder Jean-Baptiste, Boboescu Iulian-Zoltan, Damay Jérémie, Duret Xavier, Bhatti Shabana, Lavoie Jean-Michel. 2019. Phytoremediation of bark-hydrolysate fermentation effluents and bioaccumulation of added-value molecules by designed microalgal consortia. Algal Research, 42:101585, 11 p.

Quartile : Q1, Sujet : BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Résumé : Recent years marked an increased focus towards the valorization of biorefinery side-streams for the production of various high added-value molecules and platform chemicals. The present study tackles the opportunity of using liquid ethanol fermentation effluents of bark hydrolysates for microalgal conversion to various marketable molecules. Initially, 12 green microalgae strains were screened for their ability to thrive on these substrates and uptake some of the available organic compounds. Once the most suitable strains were identified, three mixed microalgal consortia were formulated and investigated in order to maximize, either individually or both si- multaneously, their biomass production and phytoremediation performances. For instance, the consortium α containing Scenedesmus obliquus, Acutodesmus obliquus, Chlorella sorokiniana and Chlorella vulgaris strains was able to consume up to 70% of C5 sugars (xylose and arabinose) and 60% of C6 sugars (fucose and hexose). The uptake of these organic compounds initially present in the fermentation effluent accounted for the removal of 27% of the total organic carbon. In addition, the microalgal community produced 55 mg/L/d, 41 mg/L/d and 26 mg/L/d of carbohydrates, lipids and proteins respectively. The photosynthetic pigments accumulated in the harvested biomass comprised of 25.8 mg/L of total chlorophyll and 5.9 mg/L of carotenoids. Finally, the pyr- olysis characteristics of the algal biomass were evaluated trough thermogravimetric analysis and the elemental composition was compared with conventional lignocellulosic feedstocks. Thus, this work proves the dual op- portunity of both reducing the toxicity of lignocellulosic ethanol fermentation effluents as well as generating high-value biomass by employing specifically-designed microalgal populations.

Mots-clés Agrovoc : bioaccumulation, effluent, Chlorella vulgaris, consortium, fermentation, biomasse, dépollution par les plantes, microalgue, Chlorella, écorce, arabinose, pyrolyse, traitement des déchets, xylose, fucose

Mots-clés libres : Designed microalgal consortia, Fermentation effluent treatment, Microalgal biomass, Biofuels, Biocommodities

Agences de financement hors UE : Natural Sciences and Engineering Research Council of Canada, National Science and Engineering Research Council

Auteurs et affiliations

• Beigbeder Jean-Baptiste, Université de Sherbrooke (CAN)
• Boboescu Iulian-Zoltan, Université de Sherbrooke (CAN)
• Damay Jérémie, Université de Sherbrooke (CAN) ORCID: 0000-0003-4658-0082
• Duret Xavier, Université de Sherbrooke (CAN)
• Bhatti Shabana, NRCC (CAN)
• Lavoie Jean-Michel, Université de Sherbrooke (CAN) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/610998/)

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