title: Anaerobic digestate as substrate for microalgae culture: the role of ammonium concentration on the microalgae productivity.
abstract: In spite of the increasing interest received by microalgae as potential alternatives for biofuel production, the technology is still not industrially viable. The utilization of digestate as carbon and nutrients source can enhance microalgal growth reducing costs and environmental impacts. This work assesses microalgal growth utilizing the liquid phase of anaerobic digestate effluent as substrate. The effect of inoculum/substrate ratio on microalgal growth was studied in a laboratory batch experiment conduced in 0.5L flasks. Results suggested that digestate may be an effective substrate for microalgal growth promoting biomass production up to 2.6 gTSS/L. Microalgal growth rate was negatively affected by a self-shading phenomenon, while biomass production was positively correlated with the inoculum and substrate concentrations. Thus, the increasing of both digestate and microalgal initial concentration may reduce the initial growth rate (μ from 0.9 to 0.04 d(-1)) but significantly enhances biomass production (from 0.1 to 2.6 gTSS/L).
authors: INRA, UR0050, Laboratoire de Biotechnologie de l'Environnement, Avenue des Etangs, Narbonne F-11100, France. Electronic address: enrica.uggetti@supagro.inra.fr.
authors: Enrica
authors: E
authors: Uggetti
authors: INRA, UR0050, Laboratoire de Biotechnologie de l'Environnement, Avenue des Etangs, Narbonne F-11100, France.
authors: Bruno
authors: B
authors: Sialve
authors: INRA, UR0050, Laboratoire de Biotechnologie de l'Environnement, Avenue des Etangs, Narbonne F-11100, France.
authors: Eric
authors: E
authors: Latrille
authors: INRA, UR0050, Laboratoire de Biotechnologie de l'Environnement, Avenue des Etangs, Narbonne F-11100, France.
authors: Jean-Philippe
authors: JP
authors: Steyer
mesh_terms: D064751:Ammonium Compounds / Q000032:analysis / Q000494:pharmacology*; D000693:Anaerobiosis / Q000187:drug effects; D018533:Biomass; D018929:Cell Culture Techniques / Q000379:methods*; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D058086:Microalgae / Q000187:drug effects* / Q000254:growth & development* / Q000378:metabolism; D009573:Nitrites / Q000032:analysis; D044444:Scenedesmus / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D014865:Waste Disposal, Fluid
chemical_list: D064751:Ammonium Compounds; D009573:Nitrites
keywords: Anaerobic digester; Biomass production; High rate ponds; Nutrients; Wastewater