Cultivation of Spirulina platensis CMU2 (Cyanobacteria) by sugar cane molasses distillery slops in raceway pond system
2006
Srisuksomwong, P. | Peerapornpisal, Y.
The aim of this study was to reduce the cost of Spirulina platensis cultivation using sugar cane molasses distillery slops as a supplement. The optimum concentration of sugar cane molasses was determined in the laboratory using Spirulina platensis CMU2 as the test organism. It was found that the highest growth (615 mg/l dried weight) was obtained when 0.04% of sugar cane molasses distillery slops was added to the basal medium (NaHCO3 8.5, NaNO3, K2HPO4 0.5 and fertilizer N:P:K = 16:16:16 0.6 g/L). The pigment contents of Chlorophyll A, carotenoid and phycocyanin were 11.301, 0.357 and 115.072 mg/L, respectively. The semi-continuous cultivation was carried out in a 1000 l raceway pond system (24 cm high) using an optimum concentration of sugar cane molasses supplement. The experiment was done in triplicate. The dried weight was highest in the first harvesting (326.82 mg/L) followed by the third (297.26 mg/L) and the second harvesting (280.45 mg/L). The protein content was highest in the third harvesting with a value of 57%. All major pigments were also increased in each harvesting. The cultivation cost was 2.80 baht/g dried weight, equivalent to a 53.3% reduction compared to cultivation in common Zarrouk's medium.
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