Increased microalgae growth and nutrient removal using balanced N:P ratio in wastewater

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Title
Increased microalgae growth and nutrient removal using balanced N:P ratio in wastewater
Author(s)
Seung Hoon Lee; Chi-Yong Ahn; Beom Ho Jo; S A Lee; J Y Park; K G An; Hee-Mock Oh
Bibliographic Citation
Journal of Microbiology and Biotechnology, vol. 23, no. 1, pp. 92-98
Publication Year
2013
Abstract
Microalgal cultivation using wastewater is now regarded as essential for biodiesel production, as two goals can be achieved simultaneously; that is, nutrient removal efficiency and biomass production. Therefore, this study examined the effects of carbon sources, the N: P ratio, and the hydraulic retention time (HRT) to identify the optimal conditions for nutrient removal efficiency and biomass production. The effluent from a 2nd lagoon was used to cultivate microalgae. Whereas the algal species diversity and lipid content increased with a longer HRT, the algal biomass productivity decreased. Different carbon sources also affected the algal species composition. Diatoms were dominant with an increased pH when bicarbonate was supplied. However, 2% CO2 gas led to a lower pH and the dominance of filamentous green algae with a much lower biomass productivity. Among the experiments, the highest chlorophyll-a concentration and lipid productivity were obtained with the addition of phosphate up to 0. 5 mg/l P, since phosphorus was in short supply compared with nitrogen. The N and P removal efficiencies were also higher with a balanced N: P ratio, based on the addition of phosphate. Thus, optimizing the N: P ratio for the dominant algae could be critical in attaining higher algal growth, lipid productivity, and nutrient removal efficiency.
Keyword
BiodieselMicroalgaeN:P ratioNitrogenPhosphorusWastewater
ISSN
1017-7825
Publisher
South Korea
DOI
http://dx.doi.org/10.4014/jmb.1210.10033
Type
Article
Appears in Collections:
Division of Biomaterials Research > Cell Factory Research Center > 1. Journal Articles
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