用复合式工艺提高活性污泥/生物膜法处理效率

Improving Pollutants Removal Efficiency of Activated Sludge/Biofilm Processes Using Hybrid Process

研究了用复合式工艺（HY）提高活性污泥（AS）和淹没式生物膜（SBF）工艺处理效率的能力.在COD容积负荷＞1.35kgCOD/（m^3·d）时,对COD的平均去除率比SBF工艺提高了10%;在NH3-N容积负荷为0.12～0.39 kgN/（m^3·d）时,对NH3-N的平均去除率可分别比AS和SBF工艺提高约21%和45%.原工艺的污染物负荷越高,对去除效果的提高程度越大.HY工艺中的悬浮污泥能够缓冲有机负荷升高对硝化过程的不利影响,使在载体上附着生长的硝化菌充分发挥效能,从而弥补了单纯AS或SBF工艺的不足.HY工艺中的微生物种群结构和微环境更为复杂,有利于其协调好氧硝化和缺氧反硝化过程,在进水TN容积负荷为0.09～0.41kgN/（m^3·d）时,对TN的平均去除率可分别比AS和SBF工艺提高约16%和21%.

A bench-scale hybrid （HY） process was used to investigate its ability to improve pollutants removal efficiency of the activated sludge （AS） and/or submerged biofilm （SBF） systems. Under the conditions of influent COD volumetric load rate 〉 1.35 kgCOD/（m^3＊ d ） , the COD mean removal rates of the HY increase by 10% compared with SBF. When the influent NH3 - N volumetric load rate is 0.12 -0.39 kgN/（m^3 ＊ d ）, the NH3 - N mean removal rates of the HY increase by about 21% and 45% respectively compared with AS and SBF. The higher pollutants loads in the original systems, the greater enhanced degree of the pollutants removal effects. When the influent COD load increases, the suspended sludge in the HY can moderate the COD load in advance, which is favorable to the nitrifiers growth and associated nitrification in the biofilm of HY. The microbial population and microenvironment in the HY are more complicated than that in the AS and/or SBF systems, which can still better harmonize simultaneous nitrification and denitrification. Therefore, when the influent TN volumetric load rate is 0.09 -0.41 kgN/（m^3 ＊ d ）, the TN mean removal rates of the HY increase by about 16% and 21% respectively compared with AS and SBF.