Feasibility of Cattle Urine as Nutrient Medium for the Microalgal Biomass Production

The nutrient medium used for the cultivation of microalgae adds more cost to its
value-added product as well as the commercial scale application. Therefore in this
study, focused feasibility of cattle urine as a cheap source of nutrients for microalgal
growth, because, it contains various minerals and economical which may support
the growth of microalgae and reduce the medium cost. To check this, fresh cattle
urine was collected, characterized, diluted and inoculated microalgae species
Oscillatoria-SRA (Stagnant rainwater algae), Oscillatoria-CWA (Cooum waste
algae), Chlorella and Synecocystis separately and incubated under fluorescent
light with 8 hours light and 16 hours dark cycle. The biomass was quantified after
15 days and found out variation in biomass quantity in all microalgae isolates.
The maximum of 2.6 g/L biomass was produced in Chlorella sp., at 10% urine,
followed by Synechocystis sp., (2.25 g/L in 10% urine), Oscillatoria sp.,-SRA (1.3
g/L in 5% urine) and Oscillatoria sp.,-CWA (0.3 g/L in 1% urine). Moreover, lipid
quantity was shown at the maximum of 12% dry weight in Oscillatoria sp-SRA.,
trailed by the 10% in Chlorella sp., 7% in Synecocystis sp., and the least of 5% in
Oscillatoria sp-CWA. This study divulged that cattle urine alone is being able to
support microalgae growth at a significant amount, thus convalescing industrial
production of microalgae ultimately will reduce the cost of microalgal valueadded
products.