U. lactuca grew well on reject water. Growth dynamics and biochemistry
of Ulva cultivated with reject water were not different
from Ulva cultivated with NHþ
4 . Cultivating Ulva with N concentrations
of 50–100 lM resulted in maximal growth rates and high uptake
rates of N and P. The biomass produced at these nutrient
concentrations was rich in protein, and the content of heavy metals
did not exceed limit values for use for animal feed or soil improvement.
The challenges in future are the area needs and balancing
high production costs with high value utilisation of the algae
biomass.