SBR反应器同步硝化反硝化影响因素及其特性

The influencing factors and the characteristics of simultaneous nitrification-denitrification in SBR

摘要:

为进一步探讨同步脱氮机理和提高反应系统同步硝化反硝化效率,利用培养驯化出高效同步硝化反硝化活性污泥,研究有机物负荷、溶氧和温度等因素对SBR反应器同步硝化反硝化脱氮效能的影响.结果表明:当温度为25～30℃、pH为7～9时,系统脱氮效果较好;当碳氮比在1:1～8:1时,COD、氨氮、TN去除率随着碳氮比的升高而降低,分两次投加有机物有利于提高好氧反硝化同步脱氮效果;当曝气量在0.12～0.80L·min-1时,氨氮去除率随曝气量的升高而升高,最后稳定在99.8%以上;TN去除率随曝气量升高先升高后降低,在曝气量为0.2L·min-1时达到最大值95.52%;COD去除率一直稳定在91%以上,曝气量的改变对COD去除率的影响不明显.系统温度为25～30℃、碳氮比为1.5:1、曝气量为0.2L·min-1、pH为7～9时,分两次投加有机物同步脱氮效果最优.

Abstract:

To investigate the mechanism of simultaneous nitrification and denitrification(SND)and promote the efficiency of SND system,by using the domesticated efficient SND sludge,the effects of organism,DO and temperature on the SBR reactor were studied.The experiment results showed that,when the temperature was 25-30 and pH was 7-9,the nitrate-nitrogen removal was preferably;when C/N rate varied between 1:1-8:1,COD concentration,ammonia nitrogen removal rate and TN removal rate decrease with the increasing of C/N rate.Dosing organic compounds in twice can enhance the aerobic denitrification effect.When aeration volume varied from 0.12 to 0.80 L·min-1,ammonia nitrogen removal rate increased first and then kept ap-proximate constant with the increase of aeration volume,finally became stable at 99.8%.TN removal rate in-creased first to the highest at 95.52%,then decreased,when aeration volume was 0.2 L·min-1,and COD was stable above 91%.The influence of aeration rate on the COD removal is not distinct.The best effect will be achieved if the system temperature is 25-30℃,C/N rate is 1.5:1,aeration volume is 0.2 L·min-1,pH is 7-9 and the dosing of organic compounds is in twice.