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http://dx.doi.org/10.11001/jksww.2013.27.1.69

Effects of pH and aeration rates on removal of organic matter and nutrients using mixotrophic microalgae  

Kim, Sunjin (Department of Environmental Science and Engineering, Center for Environmental Studies, Kyung Hee University)
Lee, Yunhee (Department of Environmental Science and Engineering, Center for Environmental Studies, Kyung Hee University)
Hwang, Sun-Jin (Department of Environmental Science and Engineering, Center for Environmental Studies, Kyung Hee University)
Publication Information
Journal of Korean Society of Water and Wastewater / v.27, no.1, 2013 , pp. 69-76 More about this Journal
Abstract
Specific growth rate and removal rate of nitrogen and phosphorus of Chlorella sorokiniana, Chlorella vulgaris, Senedesmus dimorphus those are able to metabolite mixotrophically and have high nitrogen and phosphorus removal capacity were examined. Based on the results, one microalgae was selected and conducted experiments to identify the operating factors such as pH and aeration rate. The specific growth rate and phosphorus removal rate of C. sorokiniana significantly presented as $0.29day^{-1}$ and 1.65 mg-P/L/day, while the nitrogen removal rate was high as 12.7 mg-N/L with C. vulgaris. C. sorokiniana was chosen for appropriate microalgae to applying for wastewater treatment system and was cultured in pH ranged 3 to 11. High specific growth rate and removal rate of nitrogen and phosphorus were shown at pH 7 as $0.71day^{-1}$, 7.61 mg-N/L/day, and 1.24 mg-P/L/day, respectively. The specific growth rate examined with aeration rate between 0 and 2 vvm (vol/vol-min) highly presented as $1.2day^{-1}$ with 1.5 ~ 2 vvm, while the nitrogen removal rate was elevated with 0.5 vvm as 9.43 mg-N/L/day.
Keywords
Aeration rate; Advanced wastewater treatment; Chlorella sorokiniana; Mixotrophic microalgae; pH;
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