COD/N对短程内源反硝化过程中NO和N_(2)O积累的影响

Effect of COD/N on NO and N_(2)O Accumulation During Short-Cut Endogenous Denitrification

利用序批式活性污泥反应器研究不同碳氮比(COD/N)(1,3,4,6)对短程内源反硝化污染物去除性能以及NO和N_(2)O积累的影响。结果表明,化学需氧量和亚硝态氮在COD/N大于3时去除效果较好。NO的积累峰值随着COD/N的增加而先增加后降低,在COD/N为4时达到最大值0.45 mg/L。而N_(2)O则呈现先降低后增加的趋势,当COD/N为3时积累峰值最小(3.7 mg/L)。NO的积累与COD/N、厌氧时间、NO和游离亚硝酸的抑制有关。N_(2)O的积累是COD/N、NO、游离亚硝酸等共同作用的结果。

A sequencing batch activated sludge reactor was used this study to investigate the effect of different carbon to nitrogen ratios(COD/N)(1,3,4,6)on pollutant removal performance and NO and N_(2)O accumulation in the short-cut en-dogenous denitrification.The results showed that chemical oxygen demand and nitrite nitrogen removal were better when COD/N was greater than 3.The peak of NO accumulation increased first and then decreased with the increase of COD/N,and the maximum of 0.45 mg/L was achieved when COD/N was 4.While N_(2)O accumulation showed a trend of decreasing first and then increasing.the peak of N_(2)O accumulation was the smallest(3.7 mg/L)when COD/N was 3.The NO accumu-lation was related to the COD/N,anaerobic time,NO and free nitrous acid inhibition.The N_(2)O accumulation was caused by COD/N,NO,and free nitrous acid.