waste water treatment devices by growing the microalgae

The invention relates to the treatment of domestic or industrial wastewater using microalgae. The invention particularly relates to an improvement of wastewater treatment systems by mixotrophic culture of microalgae, energy savings and footprint. The invention also relates to a process for treating waste water by microalgae culture characterized in that it comprises an injection continuously or batchwise microalgae precultured in a fermenter, said microalgae injected advantageously being in the growth phase, particularly preferably early growth phase.