中文摘要：

在SBBR工艺亚硝酸型同步硝化反硝化过程中，DO是一个主要限制性因素，通过调节曝气量控制DO浓度在3．60-4．25mg／L范围内可较好地实现亚硝酸型同步硝化反硝化。DO、pH值和ORP的变化规律与反应器内COD的降解和“三氮”的转化有良好的相关性。DO浓度的变化对DO、pH值和ORP曲线的变化规律影响较大，ORP曲线的特征点与COD的降解过程具有良好的相关性，可作为易降解有机物反应完毕的指示点。DO、pH值和ORP曲线的突跃特征点可以作为SBBR工艺亚硝酸型同步硝化反硝化反应结束的控制点。

英文摘要：

The dissolved oxygen （DO） is an important restrictive factor on simultaneous nitrifica- tion and denitrification via nitrite in sequencing batch biofilm reactor （SBBR）. Simultaneous nitrification and denitrification via nitrite could be aehieved by controlling the average DO range from 3.60 mg/L to 4.25 mg/L. The variation of DO, pH and ORP are related to COD degradation and conversion of nitro- gens in SBBR. The change of DO has great influence on the variation of DO, pH and ORP. Feature point of the ORP curve is related to COD degradation and can be used to judge the end of organic degradation. Feature point of DO, pH and ORP curves can nitrification and denitrification via nitrite.