Combined yeast and microalgal cultivation in a pilot-scale raceway pond for urban wastewater treatment and potential biodiesel production
Autor: | Francesco Pirozzi, Massimiliano Galdiero, Floriana Iasimone, Virginia D'Oriano, V. De Felice, Gianluigi Franci, Domenico Pirozzi, Gaetano Zuccaro |
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Přispěvatelé: | Iasimone, F, Zuccaro, G, D'Oriano, V, Franci, G, Galdiero, M, Pirozzi, D, De Felice, V, Pirozzi, F, Iasimone, F., Zuccaro, G., D'Oriano, V., Franci, G., Galdiero, M., Pirozzi, D., De Felice, V., Pirozzi, F. |
Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
0106 biological sciences
Environmental Engineering Biomass Pilot Projects Chlorella Wastewater 010501 environmental sciences Biofuel Disinfection Microalgae Oleaginous yeast Raceway pond Water Science and Technology Waste Disposal Fluid 01 natural sciences 010608 biotechnology Food science Lipomyces Ponds Scenedesmus 0105 earth and related environmental sciences biology Chemistry biology.organism_classification Lipids Yeast Biofuels Biodiesel production Sewage treatment |
Popis: | A mixed culture of oleaginous yeast Lipomyces starkeyi and wastewater native microalgae (mostly Scenedesmus sp. and Chlorella sp.) was performed to enhance lipid and biomass production from urban wastewaters. A 400 L raceway pond, operating outdoors, was designed and used for biomass cultivation. Microalgae and yeast were inoculated into the cultivation pond with a 2:1 inoculum ratio. Their concentrations were monitored for 14 continuous days of batch cultivation. Microalgal growth presented a 3-day initial lag-phase, while yeast growth occurred in the first few days. Yeast activity during the microalgal lag-phase enhanced microalgal biomass productivity, corresponding to 31.4 mgTSS m−2 d−1. Yeast growth was limited by low concentrations in wastewater of easily assimilated organic substrates. Organic carbon was absorbed in the first 3 days with a 3.7 mgC L−1 d−1 removal rate. Complete nutrient removal occurred during microalgal linear growth with 2.9 mgN L−1 d−1 and 0.96 mgP L−1 d−1 removal rates. Microalgal photosynthetic activity induced high pH and dissolved oxygen values resulted in natural bactericidal and antifungal activity. A 15% lipid/dry weight was measured at the end of the cultivation time. Fatty acid methyl ester (FAME) analysis indicated that the lipids were mainly composed of arachidic acid. |
Databáze: | OpenAIRE |
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