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: This study aimed to investigate growth rate and nutrient removal efficiency of Chlorella vulgaris according to nitro-gen sources and frequency of pH adjustment. Nitrogen and phosphorus removal efficiencies were evaluated in the three different conditions using NO 3- , NH 4+ as a sole nitrogen source and mixed condition. Initial nutrient concentrations in artificial wastewater were 30 mg-N/L and 3 mg-P/L similar to secondary wastewater effluent. When nitrogen source was NO 3- , there was no inhibition on the growth of C. vulgaris with adjusting pH every 24 hr while growth inhibition occurred with NH 4+ caused by pH drop. N, P removal efficiencies were no significant depending on the nitrogen sources. As pH was adjusted to 7 by pH-stat, growth rate and nutrient removal efficiencies were increased compared to adjusting pH every 24 hr, however, growth rate and nutrient removal efficiencies were no significant depending on the nitrogen sources.Key words : Autotrophic microalgae, Chlorella vulgaris, Nitrogen source, N and P removal, pH :  ,  , , / , •Received 23 October 2012, revised 30 November 2012, accepted 5 December 2012. * Corresponding author: Tel.: +82-31-201-2497, Fax: +82-31-203-4589, E-mail: sjhwang@khu.ac.kr

Growth and N, P removal efficiency of Chlorella vulgaris according to the nitrogen sources and pH condition