Digestate color and light intensity affect nutrient removal and competition phenomena in a microalgal-bacterial ecosystem
| Autor: | Christine Ziebal, Nicolas Bernet, Fabrice Béline, Anne-Marie Pourcher, Cyril Marcilhac, Bruno Sialve |
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| Přispěvatelé: | Gestion environnementale et traitement biologique des déchets (UR GERE), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), UNIVERSITE EUROPEENNE DE BRETAGNE FRA, Partenaires IRSTEA, Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Institut National de la Recherche Agronomique (INRA), Université européenne de Bretagne - European University of Brittany (UEB), Laboratoire de Biotechnologie de l'Environnement [Narbonne] (LBE), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA), Regional Council of Brittany, French Agency for the Environment and Energy Management (ADEME), Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
0106 biological sciences
Environmental Engineering Light Nitrogen [SDV]Life Sciences [q-bio] Color Chlorella 010501 environmental sciences Biology Wastewater 7. Clean energy 01 natural sciences Waste Disposal Fluid MICROALGAE 010608 biotechnology Botany Waste Management and Disposal Scenedesmus 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering AOB COMMUNITY EVOLUTION Bacteria Ecological Modeling Phosphorus Pulp and paper industry biology.organism_classification Pollution DIGESTATE Dilution Anaerobic digestion Light intensity Nitrifying bacteria Digestate [SDE]Environmental Sciences Nitrification MICROALGUE |
| Zdroj: | Water Research Water Research, IWA Publishing, 2014, 64, pp.278-287 Water Research, IWA Publishing, 2014, 64, pp.278-87. ⟨10.1016/j.watres.2014.07.012⟩ |
| ISSN: | 0043-1354 |
| Popis: | During anaerobic digestion, nutrients are mineralized and may require post-treatment for optimum valorization. The cultivation of autotrophic microalgae using the digestate supernatant is a promising solution; however the dark color of the influent poses a serious problem. First, the color of the digestates was studied and the results obtained using three different digestates demonstrated a strong heterogeneity although their color remained rather constant over time. The digestates absorbed light over the whole visible spectrum and remained colored even after a ten-fold dilution. Secondly, the impact of light and of substrate color on the growth of Scenedesmus sp. and on nitrogen removal were assessed. These experiments led to the construction of a model for predicting the impact of influent color and light intensity on N removal. Maximum N removal (8.5 mgN- [Formula: see text] L(-1) d(-1)) was observed with an initial optical density of 0.221 and 244 μmolE m(-)² s(-1) light and the model allows to determine N removal between 15.9 and 22.7 mgN- [Formula: see text] L(-1) d(-1) in real conditions according to the dilution level of the influent and related color. Changes in the microalgae community were monitored and revealed the advantage of Chlorella over Scenedesmus under light-limitation. Additionally microalgae outcompeted nitrifying bacteria and experiments showed how microalgae become better competitors for nutrients when phosphorus is limiting. Furthermore, nitrification was limited by microalgae growth, even when P was not limiting. |
| Databáze: | OpenAIRE |
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