曝气生物滤池处理效果影响因素试验研究

曝气生物滤池具有占地面积小、处理效率高等特点而成为分散型污水处理技术的优先选择，为了进一步优化该工艺的运行控制，通过试验研究了有机负荷、水力停留时间、气水比等因素对曝气生物滤池处理效能的影响，结果表明曝气生物滤池对有机负荷、水力停留时间、气水比变化具有良好的适应能力。在温度为20℃～25℃时，COD负荷在1-4．5kg／m^3·d之间、气水比在3：1～10：1之间、水力停留时间在30min-60min之间时，COD去除效果良好，平均去除率可达85％。COD负荷、停留时间和气水比对硝化反应影响显著，增加COD负荷对反应器的硝化能力有明显的抑制作用，反应器需要充分硝化时的进水有机负荷应控制在1．5kgCOD／m^3·d以内较为合适。停留时间在30min-60min、气水比在3：1～10：1范围内变化时，NH4^＋-N去除率增加显著。

Experimental Study on Influencing Factor of Biological Aerated Filter

Biological aerated filter（BAF） is a preferable technique for decentralized domestic sewage treatment with the merit of compact structure and high treatment efficiency. In order to optimize the control parameters, a pilot experiment with a single stage up -flow BAF reactor was initiated with synthetic wastewater. The experiment results indicated that the BAF reactor was good in removing COD, at CODload = 1 - 4.5 kg/m^3 · d, HRT = 30 - 60 min and ratio of gas to water = 3 ： 1 - 10 ： 1, the average removing efficiencies of COD was at 85%. COD loading, HRT and ratio of gas to water had a notable effect on nitrification, the increase of COD loading repressed the nitrification obviously, a COD loading at 1.5 kg/m^3 ·d had to be maintained for full nitrification. The ammonium removal increased with the rise of HRT and ratio of gas to water at the range of 30 - 60 min and 3 ： 1 - 10 ： 1 respectively.