关键词: 小球藻, 氨态氮, 总磷, 污水处理

Abstract: Chlorella vularis was employed to remove nitrogen and phosphorus from wastewater. The effects of initial NH+4-N and TP concentrations，N/P ratios，light/darkness ratios and pH on the removal of NH+4-N and TP were evaluated. The results showed that Chlorella vularis could almost 100% remove NH+4-N and TP，when initial concentrations of NH+4-N and TP were no more than 35 mg/L and 7 mg/L. Under the N/P ratios of 5∶1 and 10∶1， Chlorella vularis could completely remove NH+4-N within 4 d，while the N/P ratios almost has no effect on Chlorella vularis to removal of TP. At the same initial concentrations of NH+4-N or TP，the L/D ratios of 24 h∶0 h and 12 h∶12 h had no significantly effect on removal of NH+4-N and TP by Chlorella vularis. Along with the initial concentrations increasing，Chlorella vularis showed better removal effect of NH+4-N and TP under the L/D ratio of 24 h∶0 h. The optimal pH range for removal of NH+4-N and TP by Chlorella vularis were  pH 7～8 and pH 5~7, respectively.

Key words: Chlorella vularis, NH+4-N, total phosphorus, wastewater treatment