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生物滤池作为一种有效的污水处理技术,已有广泛应用.但是关于组合生物滤池净化效能与影响因素系统分析仍然缺乏报道.为此,设计构建了曝气垂直流滤池+折流式水平流滤池的组合系统,通过设定不同的水力负荷(131、94、60mm·d-1)及分流比(8∶2、6∶4、4∶6)来探究运行工况的调整对组合系统净化效能的影响.结果表明,曝气垂直流滤池对有机物、氨氮及溶解性氮的平均去除率在80%以上,而折流式水平流滤池对氨氮、总氮及溶解性氮的平均去除率在40%以下.不同运行工况对生物滤池的净化效能存在显著影响,且两种不同类型滤池的净化效能也存在显著差异(P<0.05).氧化分解是两种滤池中有机物去除的主要途径之一.两种滤池内都存在明显的硝化-反硝化,它们是滤池去除总氮的主要途径.垂直流滤池内的硝化-反硝化强度都高于水平流滤池.磷的去除主要受控于水力负荷、温度、溶解氧、有机物等,表明微生物吸收是滤池除磷的主要方式之一.相比于单一垂直流滤池,组合系统对总有机物和总磷的去除分别提高了4.4%和23.2%,对总氮的去除却降低了12.1%.降低分流比有助于提升水平流滤池反硝化强度,但是由于从原水中引入过多的氨氮,又水平流滤池的硝化能力有限,进而导致组合系统总氮去除率下降.因此,根据处理原水组成,控制适宜的分流比、停留时间及滤池内的氧化还原条件是提升该组合系统整体净化效果的关键.
Biofilter has been widely used as an effective sewage treatment technology, but there is still a lack of systematic analysis on the effectiveness and influencing factors of biofilter purification.Based on this, the design of aeration vertical flow filter + baffle Horizontal flow filter combination system, by setting different hydraulic load (131,94,60mm · d-1) and split ratio (8: 2,6: 4,4: 6) to explore the adjustment of operating conditions The results showed that the average removal rate of organic matter, ammonia nitrogen and dissolved nitrogen in aeration vertical flow filter was over 80%, while the effect of baffling horizontal flow filter on ammonia nitrogen, total nitrogen and dissolved nitrogen Of the average removal rate of 40% or less.Different operating conditions on the purification performance of biological filters have a significant impact, and the purification efficiency of the two different types of filters also have significant differences (P <0.05) .Oxidative decomposition is two kinds of filter One of the main ways to remove organics in the pond is obvious nitrification-denitrification in the two kinds of filters, which are the main ways to remove total nitrogen in the filter.The intensity of nitrification-denitrification in the vertical flow filter is higher than the level Flow filtration. The removal of phosphorus is mainly controlled by the hydraulic load Temperature, dissolved oxygen, organic matter and so on, indicating that microbial absorption is one of the main ways of removing phosphorus from the filter.Compared with a single vertical flow filter, the total removal of total organic matter and total phosphorus by the combined system increased by 4.4% and 23.2% Total nitrogen removal was reduced by 12.1%. Reducing the split ratio helped to increase the denitrification strength of the horizontal flow filter but due to the introduction of excess ammonia from the raw water, the horizontal flow filter also had limited nitrification capacity, leading to a combination of The total nitrogen removal rate of the system is decreased.Therefore, according to the raw water composition, controlling the appropriate split ratio, residence time and redox conditions within the filter is the key to improve the overall purification effect of the combined system.