【摘要】 目的:探究不同化学需氧量（Chemical Oxygen Demand, COD）对藻类生长及污水中氮磷去除的影响。方法:以蛋白核小球藻和四尾栅藻（2∶1混合）为研究对象，处理不同COD的模拟农村生活污水。结果:在2～6 d,叶绿素A含量增长率随COD初始值增加而降低，COD₄₀₀、COD₅₀₀处理组的pH显著低于COD₂₅₀、COD₃₀₀处理；第2天COD₃₀₀、COD₄₀₀和COD₅₀₀处理组的溶解氧（DO）趋于0,且在2～4 d, DO上升幅度随COD初始浓度的增加而递减。COD₃₀₀对水体铵态氮的去除效果最好，最终去除率达63.3%,并显著高于COD₅₀₀;各处理组的总磷去除率随COD初始值的增加而显著上升，其中COD₅₀₀处理对总磷的最终去除率达94.2%。结论:随COD升高，延缓了叶绿素A的增加以及pH和DO升高，而高浓度COD促进了总磷的去除，降低了铵态氮的去除。更多还原

【Abstract】 Objective: The aim of the study was to explore the effects of different chemical oxygen demand（COD） on algae growth and removal of N and P in sewage. Methods: In this study, Chlorella pyrenoidosa and Scenedesmus quadricauda taking 2∶1 mixed algae species were used to treat simulated rural domestic sewage with different COD. Results: After 2—6 days, the growth rate of chlorophyll A content decreased with the increase of COD initial concentration, and the pH of COD₄₀₀ and COD₅₀₀ was significantly lower than that of COD₂₅₀ and COD₃₀₀. On the second day, the DO tended to zero for the treatment groups of COD₃₀₀, COD₄₀₀ and COD₅₀₀. After 2—4 days, the rising range of DO decreased with the increase of COD initial concentration. COD₃₀₀ had the best removal effect on NH⁺₄-N in water, and the final removal rate was 63.3%, which was significantly higher than that of COD₅₀₀. The removal rate of total phosphorus increased significantly with the increase of COD initial value, and the final removal rate of total phosphorus in COD₅₀₀ reached 94.2%. Conclusion: As the concentration of COD increased, the growth of chlorophyll A and increases of pH and DO were delayed, and higher concentration of COD promoted the removal of total phosphorus and reduced the removal of NH⁺₄-N.更多还原