好氧/除磷颗粒对亚硝化颗粒污泥启动的影响

Effect of Aerobic/Phosphorus Granules on Start-up of Partial Nitrification Granular Sludge

在室温下,采用R1、R2、R3三组相同的SBR反应器接种污水厂回流污泥,比较了添加好氧颗粒、除磷颗粒对亚硝化颗粒污泥启动及稳定运行的影响.结果表明,在S1(0~22 d)阶段,R1、R2、R3均用了19 d启动亚硝化.在S2阶段(23~56d),R1不添加颗粒污泥,R2、R3分别添加20%好氧颗粒和20%除磷颗粒诱导亚硝化絮状污泥颗粒化,R1、R2和R3分别在76、42 d和56 d平均粒径达到412、468、400μm,均成功实现颗粒化.在S3阶段(57~108 d),进水氨氮负荷和COD负荷分别由0.4 kg·(m^3·d)^(-1)提高到0.5 kg·(m^3·d)^(-1)和0.2 kg·(m^3·d)^(-1)提高到0.5 kg·(m^3·d)^(-1),R1、R2反应器中颗粒粒径增加明显,但R3发生了污泥膨胀.在运行末期(108 d),R1和R2的平均粒径分别达到689μm和893μm.接种好氧颗粒和除磷颗粒均能快速实现亚硝化污泥的颗粒化,并且接种好氧颗粒的亚硝化颗粒污泥系统能适应较高C/N比进水,耐冲击负荷,能长期稳定运行.

The different effects of additional aerobic granules（ AGs） and phosphorus removal granules（ PRGs） on the start-up and stable operation of partial nitrification granular sludge（ PNGS） were compared at room temperature（ 22-28℃）. The results showed that in the first stage（ days 0-22）,partial nitrification was accomplished on day 19 for the three reactors（ R1,R2,and R3）. In the second stage（ days 23-56）,20% AGs and 20% PRGs were added to R2 and R3 to induce PNGS. The start-up of the granules of the three reactors was successfully achieved. The mean particle sizes of R1,R2,and R3 reached 412 μm at day 76,468 μm at day 42,and 400 μm at day 56. In the third stage（ days 57-108）,because the influent ammonia load increased from 0. 4 kg·（ m3·d）^（-1） to 0. 5 kg·（ m3·d）^（-1） and the COD load increased from 0. 2 kg·（ m3·d）^（-1） to 0. 5 kg·（ m3·d）^（-1）,the mean particle sizes of R1 and R2 increased significantly. The average particle sizes of R1 and R2 reached 689 μm and 893 μm by the end of the operation（ day 108）,but sludge expansion occurred in R3. The inoculation of either AGs or PRGs could quickly achieve granulation,but the PNGS inoculated with the AGs could adapt to higher C/N and be more tolerable to shock loads and long-term stable operation.