Nitrogen removal and recycling by Scenedesmus obliquus in semicontinuous cultures using artificial wastewater and a simulated light and temperature cycle.
Semicontinuous cultures of Scenedesmus obliquus in artificial wastewater were maintained with 30% and 40% daily dilutions and under a 14:10 h light-dark cycle, with temperatures of 25.5 and 17 degrees C during light and dark hours. Under this regime, the production of organic biomass was 39.3 and 25.2 mg l(-1)d(-1) for the 30% and 40% dilutions, and 24.9 and 16.7 mg l(-1)d(-1) of single-cell proteins. Most of the nitrogen removal took place during the light hours, with daily totals of 9.27 and 8.45 mg l(-1) for the 30% and 40% dilutions. With the former, 43.7% of the nitrogen removed was recycled by the microalgae into proteins and other organic nitrogen cell contents, but this efficiency decreased to 26.4% when the dilutions were raised to 40%.
Laboratorio UAS-CIBNOR, Centro de Investigaciones Biológicas del Noroeste, P.O. Box 1132, Paseo Claussen s/n, Mazatlán, Sinaloa, Mexico. microalgas@mzt.megared.net.mx
Domenico
D
Voltolina
Herlinda
H
Gómez-Villa
Gabriel
G
Correa
D018533:Biomass; D009584:Nitrogen / Q000378:metabolism*; D017440:Photoperiod; D011506:Proteins / Q000378:metabolism; D044444:Scenedesmus / Q000378:metabolism*; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*
D011506:Proteins; D009584:Nitrogen