Growth characteristics and removal efficiency of nitrogen and phosphorus of two kinds of non-toxic microalgae under different nitrogen and phosphorus concentrations
Chlorella ellipsoidea and Scenedesmus obliquus were cultured in different initial nitrogen and phosphorus concentrations based on second effluent to investigate the growth characteristics of the two kinds of microalgae and their abilities of nitrogen and phosphorus removal.The results showed that Chlorella ellipsoidea got the highest biomass under the test of 2#,Scenedesmus obliquus got the highest biomass under the test of 4# under pure culture.The total phosphorus (TP) removal rates of Chlorella ellipsoidea and Scenedesmus obliquus were both higher than 70%.The two kinds of microalgae got the highest biomass under the test of 3# under mixed culture.The biomass of Scenedesmus obliquus was higher than Chlorella ellipsoidea,indicated that Scenedesmus obliquus took the growth advantage under the mixed culture.the total nitrogen(TN) and TP contents in the medium were lower than 5.00 mg/L and 0.05 mg/L.This study implies that the two kinds of non-toxic microalgae both can make the deep denitrification and phosphorus removal under pure or mixed culture.
Chlorella ellipsoideaScenedesmus obliquussecond treatment effluentnitrogen and phosphorus removal