TY  - JOUR
A1  - Ruiz-Marin, Alejandro
A1  - Canedo-Lopez, Yunuen
A1  - Narvaez-Garcia, Asteria
A1  - Zavala Loría, José del Carmen
A1  - Dzul Lopez, Luis Alonso
A1  - Sámano Celorio, María Luisa
A1  - Crespo-Álvarez, Jorge
A1  - García Villena, Eduardo
A1  - Agudo-Toyos, Pablo
AV  - public
KW  - coagulation-flocculation; harvest microalgal; Moringa oleifera; Scenedesmus obliquus; biodiesel quality
ID  - uneatlantico2188
TI  - Harvesting Scenedesmus obliquus via Flocculation of Moringa oleifera Seed Extract from Urban Wastewater: Proposal for the Integrated Use of Oil and Flocculant
VL  - 12
SN  - 1996-1073
UR  - http://doi.org/10.3390/en12203996
N2  - The objectives this study were to examine the integrated use of oil?coagulant for the direct extraction of coagulant from Moringa oleifera (MO) with 5% and 10% (NH4)2SO4 extractor solution to harvest Scenedesmus obliquus cultivated in urban wastewater and to analyze the oil extracted from MO and S. obliquus. An average content of 0.47 g of coagulant and 0.5 g of oil per gram of MO was obtained. Highly efficient algal harvest, 80.33% and 72.13%, was achieved at a dose of 0.38 g L?1 and pH 8?9 for 5% and 10% extractor solutions, respectively. For values above pH 9, the harvest efficiency decreases, producing a whitish water with 10% (NH4)2SO4 solution. The oil profile (MO and S. obliquus) showed contents of SFA of 36.24?36.54%, monounsaturated fatty acids of 32.78?36.13%, and polyunsaturated fatty acids of 27.63?30.67%. The biodiesel obtained by S. obliquus and MO has poor cold flow properties, indicating possible applications limited to warm climates. For both biodiesels, good fuel ignition was observed according to the high cetane number and positive correlation with SFA and negative correlation with the degree of saturation. This supports the use of MO as a potentially harmless bioflocculant for microalgal harvest in wastewater, contributing to its treatment, and a possible source of low-cost biodiesel.
JF  - Energies
Y1  - 2019///
IS  - 20
ER  -