进水COD浓度及C/N值对脱氮效果的影响

Effect of Influent COD Concentration and C/N Ratio on Denitrification

进水COD浓度及C/N值是影响系统反硝化效果的两个重要参数,为此研究了不同进水COD浓度在不同C/N值条件下的脱氮效果。结果表明:进水COD为150mg/L和200mg/L左右时,脱氮率随C/N值的增加而增加,而进水COD为100mg/L左右时,系统的脱氮率随时间增加而降低;进水COD浓度<200mg/L时,反应条件相同、C/N值相同而进水COD浓度不同,系统的脱氮率也不相同,进水COD浓度高,则脱氮率也高;当进水有机碳源浓度较低时,需要以进水COD浓度及C/N值共同来表示系统的脱氮能力。

Influent COD concentration and C/N ratio are the important parameters affecting the denitrification. The denitrification effect under different COD and C/N ratio was investigated. The result shows that when influent COD is about 150 mg/L and 200 mg/L, denitrification rate is increased with the increase of C/N ratio; while COD is about 100 mg/L, the denitrification rate is decreased with the increased time. When the influent COD is less than 200 mg/L, the denl3, itrification rate is varied with the variable influent COD under the same reaction condition and C/N ratio, with the high concentration of influent COD resulting in high denitrification rate. At the lower concentration of organic carbon source in influent, both influent COD concentration and C/N ratio are required to show the denitrification capability.