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

摘要： 对小球藻去除污水中氮磷的性能进行了研究，考察了初始氮磷浓度、氮磷比、光照条件和pH等因素对其去除效率的影响。结果表明，在初始氮磷浓度分别在35 mg/L和7 mg/L以下时去除率接近100%；氮磷比为5∶1和10∶1，小球藻第4 d基本完全去除了污水中的氨态氮，而氮磷比对小球藻的除磷能力没有显著影响；在初始氨态氮或总磷浓度相同的条件下，光照条件(L/D为24 h∶0 h和12 h∶12 h)对氮磷去除效果的无明显差异性（P＞0.05），而随着氮磷浓度的增加，连续光照条件逐渐展现出去除氮磷的优势；小球藻在pH 7～8范围内对氨态氮的去除率最佳，pH 5～7范围内，对总磷的去除率最佳。

关键词: 小球藻, 氨态氮, 总磷, 污水处理