The results obtained (Fig. 3), showed that the
addition of a nitrogen source had a notable impact in BC
production which raised more than twofold, from
0.75 0.04 g L1 up to 1.63 0.08 g L1 for the medium with
1 g L1 of (NH4)2SO4. For higher concentrations of (NH4)2SO4, a
slight decrease in BC production was observed. In relation to
phosphorous supplementation, a twofold increase in BC production,
after the addition of 1 g L1 of KH2PO4 (Fig. 3) and a
decrease in BC production for higher values of this nutrient
were also observed.