沸石-陶粒BAF处理微污染水源水的影响因素研究

On the influencing factors of zeolite-ceramics biological aerated filter (BAF) in treating slightly polluted raw water

探讨沸石-陶粒BAF工艺对微污染水源水中CODMn、氨氮、UV254、浊度等污染物质的去除效果。通过模型试验,研究了填料高度、水力负荷、气水比等因素对沸石-陶粒曝气生物滤池（BAF）工艺处理效果的影响。结果表明,在水力负荷为1.2-4.8m^3/（m^2.h）、气水比为1时,CODMn、氨氮、UV254和浊度的去除率随填料层高度的增加而增加,其中CODMn、UV254、浊度的去除在最初的440mm内最为显著,而氨氮的去除在220~440mm范围内较明显;在气水比为1,水力负荷分别为1.2m^3/（m^2.h）、2.4m^3/（m^2.h）和4.8m^3/（m^2.h）时,CODMn的总去除率分别为38.62%、32.23%和25.37%,较合适的水力负荷为.2m^3/（m^2.h）;在水力负荷为1.2m^3/（m^2.h）、气水比由0.5增为1时,CODMn的平均去除率由26.34%增为36.31%,氨氮的平均去除率由8.15%增为94.4%,当气水比增大为2时,CODMn、氨氮的去除率增加很少,合适的气水比为1。研究表明,沸石-陶粒BAF工艺处理微污染水源水的效果良好,且所需的填料高度小,气水比低。

This article aims to introduce our＇ research on the removal effect of slightly polluted raw water by using ZCBAF process, which involves media height of BAF, hydraulic load, the air/water ratio and other problems involved. In so doing, we have examined a few factors affecting the ZCBAF process by means of pilot-plant experiments. Our testing results show that tile removal rate of the pollutants in the slightly polluted raw water resources has been greatly improved with the increase of media height as the hydraulic load was going from 1.2 m^3/（m^2·h） to 4.8 m^3/（m^2·h）. In addition, COD.Mn, UV254, and the turbidity have also basically been removed at the foremost height of 440 mm, with NH4^＋ - N being removed mostly at the height of 220 -440 ram. Besides, the average removal rates of CODM. are 38.62%, 32.23% and 25.37% at the hydraulic load of 1.2 m^3/（m^2·h）, 2.4 md/（m^2·h） and 4.8 m^3/（m^2·h） respectively, air/water ratio of 1 ： 1. When the hydraulic load is 1.2 md/（m^2·h）, the removing rates would be in the order of 26.34% of CODM. and 78.15% of NH4^＋ - N at the air/water ratio of 0.5： 1, and 36.31% of CODM. and 94.4% of NH4^＋ - N were removed at the air/water ratio of 1 ： 1. However, if the air/water ratio is 2 ： 1, the average removal rate of CODM, and NH4^＋ - N can hardly be improved. The appropriate hydraulic load and air/water ratio of ZCBAF to treat micro-polluted raw water are thus expected to be 1.2 md/（m^2·h） and 1 ： 1.