预加不同比例不同粒径好氧颗粒对SBR中好氧颗粒污泥形成的影响

在SBR反应器中以好氧颗粒和絮状活性污泥的混合污泥为接种污泥,分两阶段进行好氧颗粒污泥的培养.第一阶段在3个SBR反应器中分别接种10%、15%和20%的颗粒;第二阶段在3个反应器中分别接种未经筛分、粒径≤1 mm和粒径>1mm的颗粒,接种比例均为20%.在培养过程中对各反应器中污泥形态、粒径变化、完全颗粒化时间以及有机物的降解能力进行了比较研究并对快速培养的作用机制进行了探讨.结果表明,第一阶段培养,接种比例为20%的反应器完全颗粒化时间较短,仅为24 d;第二阶段培养,接种未经筛分颗粒的反应器完全颗粒化时间较短,仅为30 d.两次培养的好氧颗粒均具有良好的沉降性能和去污效果,SVI稳定在40 mL.g-1以下,COD去除率保持在90%以上.预加好氧颗粒后好氧颗粒的形成过程分为两个阶段:好氧颗粒加速解体阶段和好氧颗粒解体与快速形成阶段.

Acceleration of the Formation of Aerobic Granules in SBR by Inoculating Different Proportions and Different Diameters of Mature Aerobic Granules

In the SBR reactor, the mixed traditional activated sludge and aerobic granules were used as seed sludge to cultivate aerobic granular sludge. The whole research can be divided into two phases. In the first stage, different proportions of aerobic granules (ten, fifteen and twenty percent) were added to three SBR reactors, respectively. In the second stage, aerobic granules of different sizes (unscreened, smaller than or equal to 1 mm in diameter, larger than 1 mm in diameter) were added to three SBR reactors with the proportion of twenty percent, respectively. During the cultivation, the morphological change of the sludge, variation of particle size, maturity time and removal rate of pollutants were studied. The mechanism of fast cultivation was also discussed. The results showed that the reactor with twenty percent aerobic granules had the shortest maturity time of 24 days in the first stage and the reactor with unscreened aerobic granules had the shortest maturity time of 30 days in the second stage. All the cultivated aerobic granules had a good settling property and detergency performance, with the SVI distinctly below 40 mL·g^-1 and the COD removal rate staying above 90%. The formation of aerobic granules could be divided into two stages: the accelerated disintegration stage and the disintegration and rapid forming stage.