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KMID : 0545120140240081123
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Journal of Microbiology and Biotechnology
2014 Volume.24 No. 8 p.1123 ~ p.1132
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Nutrient Removal and Biofuel Production in High Rate Algal Pond Using Real Municipal Wastewater
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Kim Byung-Hyuk
Kang Zi-On
Rishiram Ramanan
Choi Jong-Eun
Cho Dae-Hyun
Oh Hee-Mock
Kim Hee-Sik
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Abstract
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This study evaluated the growth and nutrient removal ability of an indigenous algal consortium on real untreated municipal wastewater in a high rate algal pond (HRAP). The HRAP was operated semicontinuously under different hydraulic retention times (HRT: 2, 4, 6, and 8 days). The average removal efficiencies of chemical oxygen demand, and total nitrogen and phosphate of real municipal wastewater were maintained at 85.44 ± 5.10%, 92.74 ± 5.82%, and 82.85 ± 8.63%, respectively, in 2 day HRT. Algae dominated the consortium and showed high settling efficiency (99%), and biomass and lipid productivity of 0.500 ± 0.03 g/l/day and 0.103 ± 0.0083 g/l/day (2day HRT), respectively. Fatty acid methyl ester analysis revealed a predominance of palmitate (C16:0), palmitoleate (C16:1), linoleate (C18:2), and linolenate (C18:3). Microalgal diversity analyses determined the presence of Chlorella, Scenedesmus, and Stigeoclonium as the dominant microalgae. The algal consortium provides significant value not only in terms of energy savings and nutrient removal but also because of its bioenergy potential as indicated by the lipid content (20-23%) and FAME profiling.
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KEYWORD
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Algal consortium, High rate algal pond, Municipal wastewater, Chlorella sp., Scenedesmus sp.
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