Passive Microalgae Immobilization for Wastewater Treatment: Study of Residual Glycerol Consumption

Abstract

The aim of the present study is to evaluate the viability of glycerol as carbon source on immobilized algae cultures coupled with a modification on nitrogen (NO₃-) and phosphate (PO₄) concentration for the production of high valuable compounds (carbohydrates, proteins and lipids).
it was determined that the conditions who favour the deposition of carbohydrates are 3-5% (v/v) of glycerol and 0.37 (g/L) of NaNO₃. On The other hand, for obtain higher amounts of lipids, a 3% (v/v) of glycerol coupled with a limitation in the nitrogen source (0.04 g/L) are needed. Finally, in order to improve deposition of total proteins, larger concentrations of glycerol (5% v/v), NaNO₃ (>0.37 g/L) and phosphate are needed.