活性污泥系统动态比耗氧速率的检测与可行性验证

On-line Determination of Specific Oxygen Uptake Rate in Activated Sludge System: Demonstration in SBR Process

为了考察活性污泥系统动态比耗氧速率(RSOUR)的变化规律以及作为硝化反应过程控制参数的可行性,提出了一种在线检测、同时反馈SBR工艺活性污泥SOUR的方法.采用SBR1和SBR2两个反应器,分别接种亚硝酸盐氧化菌(NOB)和氨氧化菌(AOB)占优势的活性污泥,试验结果表明,SBR1系统反应到第290 min时,氨氧化结束,RSOUR大幅下降,每克MLSS每分钟耗氧从0.074 mg降到0.013 mg;SBR2系统反应到第206 min时,氨氧化结束,RSOUR大幅下降,每克MLSS每分钟从0.01 mg降到0.004 mg.RSOUR的骤降为硝化反应结束的特征点,此时应停止曝气.通过考察RSOUR曲线的变化规律,捕捉曲线上的特征点,可实现控制硝化反应进程,为以RSOUR为参数进行实时控制奠定理论基础.

In order to investigate the variations of specific oxygen uptake rate （RSOUR） and its feasibility during nitrification as a control parameter in activated sludge system, a method was presented realizing on-line determination and feedback in SBR process. Two SBRs were seeded with activated sludge of nitrite-oxidizing bacteria （NOB） and nitrite-oxidizing bacteria （AOB） as the dominant bacteria, respectively. The variations of SOUR under constant dissolved oxygen concentration were studied and results showed RSOUR of SBR1 decreased dramatically from 0.01 to 0. 004 mg O2 per gram and minute, after 290 rain aerobic reaction time, while that of SBR2 declined from 0. 074 to 0. 013 mg O2 per gram and minute, after 206 min aerobic reaction time at the completion of ammonium oxidation. The sharp decline of RSOUR indicated the completion of nitrification, then aeration should be terminated. RSOUR curve can exactly reflect the process of nitrification, all of which may well lay a theoretical foundation for application of SOUR as on-line control parameters.