采用上流式曝气生物滤池处理城市污水厂二级出水,以满足火电厂原有地下水处理设备的进水要求,研究曝气生物滤池进出水 pH 值的变化,曝气生物滤池对浊度、氨氮和化学需氧量(chemical oxygen demand, COD)的去除效果,确定最佳运行参数及脱氮效率。实验结果表明,该反应器可有效实现有机物、氨氮的同步去除,出水水质稳定。按碳氮物质的量比为1投加碳源后,曝气生物滤池对氨氮的去除率可维持在63%左右,在高浓度氨氮的情况下,氨氮去除率可以达到72%,对 COD 的去除率可以达到60%,出水 pH 稳定在6.5至7.5,浊度小于3 NTU。%Up-flow biological aerated filter is used to treat secondary effluent from urban sewage plant to feed water to under-ground water treatment equipment of thermal power plant.The paper investigates pH value change of water from inlet to outlet of the biological aerated filter and the effect on removing turbidity,ammonia nitrogen and chemical oxygen demand (COD)to determine the optimal operation parameter and denitrification efficiency.The experimental result shows that the reactor can effectively remove organic substances and ammonia nitrogen and in the meantime stabilize outlet water quality. With the C/N ratio of 1 ,ammonia nitrogen removal efficiency of the biological aerated filter can be as high as 60% and the pH value of outlet water can be stabilized between 6.5 and 7.5 ,turbidity smaller than 3 NTU.
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