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KMID : 0545120020120060979
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Journal of Microbiology and Biotechnology
2002 Volume.12 No. 6 p.979 ~ p.985
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Nitrogen Removal from Wastewaters by Microalgae Without Consuming Organic Carbon Sources
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LEE KWANGYONG
Lee Choul-Gyun
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Abstract
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The possibility of microalgal nitrogen treatment was tested in wastewater with a low carbon/nitrogen (C/N) ratio. Chlorella kessleri was cultured in the two different artificial wastewaters with nitrate as a nitrogen source: one contained glucose for an organic carbon source and the other without organic carbon sources. The growth rates of the two cultures were almost identical when the aeration rate was over 1 vvm. These results suggest that microalgae could successfully remove nitrogen from wastewater, as far as the mass transfer of CO_2 was not limited. Nitrate was successfully reduced to below 2 mg NO_3^-N/ml from the initial nitrate concentration of 140 mg NO_3^-N/ml in 10 days, even in the wastewater with no organic carbon source. Similar results were obtained when ammonium was used as the sole nitrogen source instead of nitrate. Higher concentrations of nitrogen of 140, 280, 560 and 1,400 mg/ml were also tested similar amounts of nitrogen were removed by algal cultures without showing any substrate inhibition.
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KEYWORD
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