pH对SBBR工艺亚硝酸型SND及过程控制的影响

在亚硝酸型SND过程中,pH值变化对亚硝化细菌和反硝化细菌的生物活性具有明显影响,pH值在6.8～8.2的中性和略偏碱性范围内可以较好地实现亚硝酸型同步硝化反硝化。DO、pH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,pH值变化对DO和ORP曲线变化规律影响较小,但pH曲线变化较大时,表现出不同的变化规律,对反应过程控制中失去指示意义,可以根据DO和ORP在变化曲线上的特征点来判断SBBR法亚硝酸型同步硝化反硝化的终点。

EFFECT OF pH ON SIMULTANEOUS NITRIFICATION AND DENITRIFICATION VIA NITRITE AND ITS PROCESS CONTROL IN SEQUENCING BATCH BIOFILM REACTOR

The pH change had an significant inhibitory effect on the biological activity of nitrite bacteria and denitrifying bacteria during simultaneous nitrification and denitrification via nitrite.The average pH range from 6.8 to 8.2 was proved very efficient for simultaneous nitrification and denitrification(SND) via nitrite.The variation of DO、pH and ORP were well related to organic degradation,nitrification and denitrification in SBBR.The pH change had little influence on the variation of DO and ORP,but it had great influence on pH curve and led to different variations.The variation of pH lost its indicative significance as process control parameters for the simultaneous nitrification and denitrification via nitrite.So that judgment on the ending of simultaneous nitrification and denitrification via nitrite could be based on the varied curve of DO and ORP.