Although orbal oxidation ditch has been widely employed in our country, it removal efficiency of nitrogen was very low. Based on monitoring and analyzing operation data of orbal oxidation ditch, it was found that highly dissolved oxygen concentration, which inhibited the denitrification process as the main cause for the low nitrogen removal efficiency of the process. Therefore, reducing the number of aeration disc is the most flexible approach for effectively lowering the dissolved oxygen concentration in the orbal oxidation ditch system and improving the nitrogen removal efficiency. By reducing the number of aeration disc, the average concentration of dissolve oxygen in ditch reduced to 0.20mg/L from O.Slmg/L, and the nitrogen removal efficiency was increased to 70%, compared with 40% nitrogen removal efficiency last year.%Orbal氧化沟工艺在我国得到了广泛的应用,但在运行过程中也存在着脱氮效果低等问题.通过对Orbal氧化沟运行数据的监测分析和模拟发现,其脱氮效果差的主要原因是由于过度充氧导致氧化沟内溶解氧过高,抑制了系统内反硝化反应顺利进行造成的.通过减少曝气转碟的数量,有效的降低了系统内溶解氧浓度,沟内平均溶解氧浓度从改进前的0.51mg/L降低到改进后的0.20mg/L,提高了系统的脱氮效果.改进后脱氮效率比改造前同期脱氮效率有了显著提高,总氮去除率达到了70％,比去年同期提高了30％.
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