Nitrates are one among the supportive nitrogen sources for
microalgae. Fig. 3a and b presents the nitrates removal by
C. pyrenoidosa and S. abundans in raw sample and autoclaved
sample, respectively. It can be noted from Fig. 3(a) that the
maximum nitrate removal by C. pyrenoidosa cultivated in
raw sample with the inoculum size of 10% and 20% was
observed as 78% and 71%, respectively, whereas, in autoclaved
sample with the inoculum size of 10%, it was observed
as 80%. Similarly, it can be noted from Fig. 3(b) that the maximum
nitrate removal by S. abundans cultivated in raw sample
with the inoculum size of 10% and 20% was observed as 81%
and 74%, respectively, whereas, in autoclaved sample with the
inoculum size of 10%, it was observed as 83%.