000002410 001__ 2410
000002410 005__ 20181220113754.0
000002410 022__ $$a2211-9264
000002410 0247_ $$2DOI$$a10.1016/j.algal.2018.04.005
000002410 037__ $$aARTICLE
000002410 041__ $$aeng
000002410 245__ $$aFate and reuse of nitrogen-containing organics from the hydrothermal conversion of algal biomass
000002410 260__ $$c2018
000002410 269__ $$a2018-04
000002410 300__ $$a9 pages
000002410 506__ $$avisible
000002410 520__ $$aHydrothermal (HT) conversion is a promising and suitable technology for the generation of biofuels from microalgae. Besides the fact that water is used as a “green” reactant and solvent and that no biomass drying is required, the technology offers a potential nutrient source for microalgae culture using an aqueous effluent very rich in essential inorganic nutrients. However, upon continuous and multiple recycling of this HT effluent, the recalcitrant organic fraction is likely to increase and may potentially attain toxic thresholds for microalgae use. In this work, we show the presence of recalcitrant N-containing organic compounds (NOC's) in the HT effluent. The most prominent NOC's in the extracts were carefully examined for their effect on microalgae, namely 2-pyrrolidinone and β-phenylethylamine (β-PEA). The first set of experiments consisted in testing these two substances at three different concentrations (10, 50 and 150 ppm) using three different microalgae strains: Phaeodactylum tricornutum, Chlorella sorokiniana and Scenedesmus vacuolatus. The confirmed half maximal inhibitory concentration (IC50) was approximately 75 ppm for all tested species. In the second set of experiments, P. tricornutum was grown using diluted HT effluent. Experimental conditions were set by adjusting the nitrogen concentration in the HT effluent to be equal to a known commercial medium. The concentrations of specific NOC's were lowered to concentrations of 8.5 mg/L 2-pyrrolidinone and 0.5 mg/L β-PEA after dilution. The growth of P. tricornutum using the diluted HT solution was kept constant with no evidence of inhibition or consumption of NOC's, as the concentration of the specific compounds remains the same before and after growth. Therefore, in order to avoid effects of accumulation of NOC's upon continuous recycling, the HT effluent was pumped through the existing hydrothermal gasification unit as a water clean-up step. The conversion of NOC's to ammonium was successfully achieved.$$9eng
000002410 546__ $$aEnglish
000002410 540__ $$acorrect
000002410 592__ $$aHEIG-VD
000002410 592__ $$bIGT - Institut de Génie Thermique
000002410 592__ $$cIngénierie et Architecture
000002410 65017 $$aIngénierie
000002410 6531_ $$amicroalgae$$9eng
000002410 6531_ $$aalgal biomass$$9eng
000002410 6531_ $$ahydrothermal conversion (HT)$$9eng
000002410 6531_ $$aN-containing organic compounds (NOC's)$$9eng
000002410 6531_ $$abiofuel$$9eng
000002410 655__ $$ascientifique
000002410 700__ $$uSchool of Management and Engineering Vaud, HES-SO // University of Applied Sciences Western Switzerland ; Ecole Polytechnique Fédérale de Lausanne (EPFL), School of Architecture, Civil and Environmental Engineering (ENAC), IIE GR-LUD, Station 6, CH-1015 Lausanne$$aBagnoud-Velásquez, Mariluz
000002410 700__ $$uEcole Polytechnique Fédérale de Lausanne (EPFL), School of Architecture, Civil and Environmental Engineering (ENAC), IIE GR-LUD, Station 6, CH-1015 Lausanne, Switzerland ; Paul Scherrer Institute (PSI), Chemical Processes and Materials, CH-5232 Villigen PSI, Switzerland$$aDamergi, Eya
000002410 700__ $$uEcole Polytechnique Fédérale de Lausanne (EPFL), Laboratory of Sustainable and Catalytic Processing LPDC, Station 6, CH-1015 Lausanne, Switzerland ; Paul Scherrer Institute (PSI), Chemical Processes and Materials, CH-5232 Villigen PSI, Switzerland$$aPeng, Gaël
000002410 700__ $$uPaul Scherrer Institute (PSI), Catalytic Process Engineering, CH-5232 Villigen PSI, Switzerland ; University of Applied Sciences Northwestern Switzerland (FHNW), Brugg-Windisch, Switzerland$$aVogel, Frédéric
000002410 700__ $$aLudwig, Christian$$uEcole Polytechnique Fédérale de Lausanne (EPFL), School of Architecture, Civil and Environmental Engineering (ENAC), IIE GR-LUD, Station 6, CH-1015 Lausanne, Switzerland ; Paul Scherrer Institute (PSI), Chemical Processes and Materials, CH-5232 Villigen PSI, Switzerland
000002410 773__ $$g2018, 32, pp. 241-249$$tAlgal Research
000002410 8564_ $$uhttps://hesso.tind.io/record/2410/files/Bagnoud-Velasquez_2018%3AHT_algal_biomass.pdf$$s1409284
000002410 906__ $$aGREEN
000002410 909CO $$pGLOBAL_SET$$ooai:hesso.tind.io:2410
000002410 950__ $$aI2
000002410 980__ $$ascientifique