Cultivation of spirulina platensis using pig wastewater in a semi-continuous process
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Author list: Chaiklahan R., Chirasuwan N., Siangdung W., Paithoonrangsarid K., Bunnag B.
Publisher: The Korean Society for Applied Microbiology
Publication year: 2010
Journal: Journal of Microbiology and Biotechnology (1017-7825)
Volume number: 20
Issue number: 3
Start page: 609
End page: 614
Number of pages: 6
ISSN: 1017-7825
Languages: English-Great Britain (EN-GB)
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Abstract
The effluent from anaerobic digestion contains organic nitrogen and phosphorus, which are both required for growth of Spirulina platensis. Effluent (20%) from the upflow anaerobic sludge blanket (UASB) from a pig farm, supplemented with 4.5 g/l sodium bicarbonate (NaHCO3) and 0.2 g/l urea fertilizer (46:0:0, N:P:K), was found to be not only a suitable medium for the growth of Spirulina platensis but also a low-cost alternative. Cost calculation showed that this medium is 4.4 times cheaper than modifized Zarrouk's medium. The average productivities of a semi-continuous culture grown under outdoor conditions in a 6-l scale and a 100-l pilot scale were 19.9 g/m2/d and 12 g/m2/d, respectively. In addition, the biomass of organisms grown in UASB effluent contained approximately 57.9% protein, 1.12% γ-linolenic acid, and 19.5% phycocyanin. The average rates of bicarbonate, total nitrogen, and phosphorus removal were 380 mg/l/d, 34 mg/l/d, and 4mg/l/d, respectively.
Keywords
Pig waste
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