Abstract
Chlorella vulgaris was cultivated in wastewater discharged from a steel- making plant with the aim of developing an economically feasible system to remove ammonia from wastewater and from Nue gas simultaneously. Since CO 2 no phosphorus compounds existed in wastewater, external phosphate (15E3E 46E 0gm ~3) was added to the wastewater. After adaptation to 5% (v/v) the CO 2 , growth of C. vulgaris was signi-cantly improved at a typical concentration of in Nue gas of 15% (v/v). Growth of C. vulgaris in raw wastewater was better CO 2 than that in wastewater bu†ered with HEPES at 15% (v/v) -xation CO 2 .C O 2 and ammonia removal rates were estimated as 26E 0g m~3 h~1 and 0E92 g CO 2 m~3 h~1, respectively, when the alga was cultivated in wastewater supple- NH 3 mented with 46E 0g m~3 without pH control at 15% (v/v) PO 4 CO 2 .
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