折流曝气生物滤池中污染物与微生物沿程变化规律

Variation of Pollutants Concentration and Microorganism Population Along Baffled Biological Aerobic Filter

BBAF滤池是一种新型曝气生物滤池,为考察其中污染物与微生物沿程变化规律,分析了不同厚度滤层对有机物、氨氮等污染物的去除效果,MPN法测定了具有代表性滤层厚度处的异养菌和硝化菌数量;通过镜检观察研究了BBAF滤池中微生物种群的沿程分布特点。研究表明:BBAF滤池中COD浓度随滤层厚度增加逐渐降低,前4个单池对COD有很好的去除效果,但对氨氮的去除作用较弱,其中的微生物以异养菌为主;第5、6、7单池中,有机负荷较低,促进了硝化菌增殖,提高了硝化效果。BBAF滤池的各单池之间存在浓度梯度,使不同滤层中形成了微生物优势种属,有利于BBAF滤池达到最佳运行效果。

Baffled Biological Aerated filter（BBAF） is an innovative biofilter for wastewater treatment.The arm of this work is to investigate the variation of pollutants concentration and microorganism population along the depth of media.Removal efficiency of organic pollutants and ammonia along the media depth of baffled biological aerobic filter were measured.Quantity of heterotrophic bacteria and nitrobacteria in representative depth of media was examined with MPN test,and microorganism population of each filter was studied by means of microscopic observation.The characteristics of microorganism population distribution in BBAF was studied by means of microscopic observation.The results show that COD concentration decreases gradually with the increase depth of media layer.The front four filters have good performance on organic pollutants removal,but performance on ammonia removal is weak,indicating that heterotrophic bacteria is dominating microorganism in these filters.In conditions of lower organic loads bring about a higher growth of nitrobacteria increases the nitrification efficiency in filter five to filter seven.Because the existence of concentration gradient in different filters of BBAF,dominant microorganism population might be formed along the depth of filter media layer and favored the improving treatment efficiency of BBAF.