饥饿期间增加曝气量好氧颗粒污泥的形成特点

高有机负荷率8.0kgCOD(/m3·d)条件下,通过两种不同的曝气方式研究好氧颗粒污泥的形成特点,即在反应器R1中采用恒定的曝气流量,而在反应器R2中,30min曝气后,进行沉淀和排水,然后采用较大的曝气流量进行曝气。研究发现:(1)外部基质在前30min被快速降解,其溶解性有机碳DOC基本被消耗到最低水平;(2)在中途排水后的饥饿状态下增加曝气量的反应器R2相对于曝气量一直不变且中途未排水的R1而言,颗粒变的大而疏松,即:在R2中颗粒尺寸>0.9mm占有93%,而颗粒密度均<1.016g/mL。(3)反应器R2在饥饿状态下增加曝气量可以使胞外多聚物(EPS)糖类被当作基质被消耗。

Characteristics of Aerobic Granulation with the Increase of Aeration during Famine Phase

Two methods of aeration have been investigated under the organic loading rate of 8.0kg COD(/m3·d).In reactor R1,a const aeration was applied while in R2 the effluent was removal after 30 min aeration and then a higher aeration was applied.Results show that the external substrate in terms of dissolved organic carbon(DOC)was fast depleted with the first 30 min of aeration and then it was remained in the low level.An increased shear force during famine phase after removal of effluent brought about the loose granules comparing with the const aeration,91% granules in R2 were more than 0.9 mm in diameter,the density of those granules,however was less than 1.016g/mL.Protein content of extracellular polymeric substances(EPS)could be utilized during the famine phase in the reactor R2.