Coupling of wastewater treatment and microalgae products recovery: Effect of phosphorus components on the biochemical composition and phosphorus absorption of Chlorella pyrenoidosa

Microalgae cultivation with wastewater provides a promising pathway in wastewater treatment and microalgae products recovery. Different forms and concentrations of phosphorus were used to understand the effect of complex phosphorus components in wastewater on microalgae biochemical composition and phosphorus absorption. The results showed that various phosphorus forms could be absorbed and utilized, and the higher biomass production was obtained with the combination of K2HPO4 and ATP than that of Na(5)P(3)O(10)( )and G6P. C. pyrenoidosa could uptake and storage luxury phosphorus with adequate phosphorus supply. Increasing phosphorus concentrations had a positive effect on carbohydrate and protein contents, while had a negative effect on biomass production and lipid contents. The maximum total volumetric energy yield of C. pyrenoidosa was obtained with the combination of K2HPO4 and ATP under 10 mgP/L. The results could further guide the coupling of wastewater phosphorus recovery and microalgae biofuels production.