三种曝气生物滤池滤料处理城市污水的对比研究

Study on Urban Domestic Sewage Treatment by Three Kinds of Filtering Materials in Biological Aerated Filter

分别以页岩陶粒、悬浮滤料和轻质滤料作为曝气生物滤池的滤料来处理生活污水,考察了三种滤料对COD、NH3-N和SS等指标的去除效果及运行要求。结果表明,相对于传统的陶粒滤料,悬浮滤料对NH3-N的降解能力较强,但由于对微小絮体的截留能力不足,其对COD的去除率不高,造成出水COD较高;轻质滤料的截留效果较好,对COD和NH3-N的去除能力都优于陶粒滤料,但其反冲洗难度较大;以悬浮滤料为主体,和轻质滤料组成复合滤料层,可以充分发挥二者的优点,克服其不足,对城市污水的处理效果更好。

Ceramsite, suspended carrier and light filtering material were respectively used for urban domestic sewage treatment in the biological aerated filter. The removal efficiencies of COD, NH3 - N and SS by the filtering materials and their operation requirement were investigated. The results show that the suspended carrier has better removal efficiency of NH3 - N compared to the ceramsite. However, because of its weak interception capacity of small floc, its COD removal efficiency is lower, resulting in higher effluent COD. On the other hand, the light filtering material has better interception capacity of small floc, and its removal capacity of COD and NH3 - N is better than the ceramsite. However, it is difficult to backwash the light filtering material. To maximize the advantages of each material and minimize its disadvantage, the composite layer of filtering materials is composed of the suspended carrier and the light filtering material, which improves the treatment efficiency of urban domestic sewage.