组合填料厌氧/好氧生物滤池(AABF)除磷效果研究

The Effect of Combined Packing on Phosphorus Removal in the Alternating Anaerobic/Aerobic Biofilter(AABF)

为能提高生物滤池除磷效率,采用配对比较设计法研究了石英砂单一填料生物滤(SMAABF)和火山岩—石英砂组合填料生物滤池(CMAABF)在启动以及稳定运行过程中的处理效果。结果显示,启动过程中,CMAABF挂膜及启动时间短,对COD的去除率稳定在75%以上,但对总磷去除率不稳定。稳定运行期间,CMAABF对总磷的平均去除效率为80.21%,明显优于采用SMAABF的75.38%,t检验结果也表明,两种滤池在进水TP差异不大的条件下,出水TP存在显著差异。CMAABF对COD的去除主要发生在厌氧段火山岩层,占COD总去除效率的87.70%,对总磷的去除主要发生在好氧段火山岩层和滤池中部的石英砂层,分别占TP总去除效率的57%及30%。

In order to improve phosphorus removal, the new combined packing medium（lava and quartz sand） was used in an alternating anaerobic/aerobic biofilter（AABF）, using single packing medium（pure quartz sand） AABF as the control. The paired-comparison design method was applied to observe the effect of biofilter medium in the start-up and stable operation process of AABF. The start-up period（i.e. inoculation, biofilm establishment and acclimation） of combined packing medium AABF（CMAABF） is shorter than that of the single packing medium AABF. In addition, the COD removal achieved higher than 75 % while the total phosphorus removal was unstable during the start-up. The TP average removal rise to 80.21 % in the CMAABF, which was obviously higher than the SMAABF（75.38 %）. The results of the paired-t test also indicated that significant differences existed between the average effluents TP of the two kinds of biofilters, under the similar influent TP conditions during the stable operation of AABF. The removal of COD mainly occurred in the lava layer（in the anaerobic stage）, accounting for 87.70 % of the total COD removal in the CMAABF. However, the total phosphorus occurred mainly in the bottom and middle part of the biofilter column（the lava and quartz sand layer）, in the aerobic stage of AABF, accounting for 57 % and 30 % of total TP removal efficiency respectively.