Biomass, nutrient removal capacity, lipid productivity and morphological changes of Chlo- rella sorokiniana and Desmodesmus communis were investigated in mixed wastewaters with different CO2 concentrations. Under optimal condition, which was 1:3 ratio of swine wastewater to second treatedmunicipal wastewater with 5%CO2, the maximum biomass concentrations were 1.22 g L-1 and 0.84 g L-1 for C. sorokiniana and D. communis, respec- tively. Almost all of the ammonia and phosphorus were removed, the removal rates of total nitrogen were 88.05% for C. sorokiniana and 83.18% for D. communis. Lipid content reached 17.04% for C. sorokiniana and 20.37% for D. communis after 10 days culture.CO2 aeration increased intracellular particle numbers of both microalgae and made D. commu- nis tend to be solitary. The research suggested the aeration ofCO2 improve the tolerance of microalgae to high concentration of NH4-N, and nutrient excess stress could induce lipid accumulation of microalgae.
Yao, L., Shi, J., & Miao, X. (2015). Mixed wastewater coupled with CO2 for microalgae culturing and nutrient removal. PLoS ONE, 10(9). https://doi.org/10.1371/journal.pone.0139117