Scale up algal cultures
Selected microalgal strains were pre-cultured in 100 mL sterilized
bottle reactor and incubated in 300 C with light intensity
of 30 Watt/m2 in alteration of 12 h dark and 12 h light regime.
After 5e7 days, when the cell density reaches 0.5 of absorbance
(680 nm), sample was transferred to the 1 L culture
vessel. This culture would be the stock for scale up cultivation
to 5 L that was transferred gradually. The procedures were
similar to the all isolates with their appropriate selected
media. For running the experiment, the isolates were cultivated
in cylindrical vessel reactor with 5 L working volume
during 30 days in triplicate. Observed parameters are growth
rate, proximate biomass and environmental condition such as
temperature, pH and light intensity at per three days. The
growth rate of each strain was determined by cell turbidity
that measured by spectrophotometry (Shimadzu UV-1700) at
680 nm, comparing to medium as blank control [14].The
environment factors were measured by portable kit for pH,
temperature and light intensity.