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采用培养成熟并稳定运行一段时间的生物除铁除锰除氨氮滤柱,考察进水氨氮浓度变化对铁锰氨氮去除效果的影响。结果表明:进水氨氮从约1.2 mg·L~(-1)逐步提高到约2.0 mg·L~(-1)的过程中,铁、锰和氨氮的去除效果没有受到影响。当进水氨氮超过2 mg·L~(-1)时,进水溶解氧不足,铁的去除效果不受影响;生物除锰受到氨氮升高过程中产生的亚硝氮的抑制,并且与氨氮竞争溶解氧,导致出水锰升高,然而锰氧化菌能够在低溶解氧条件下将锰氧化,出水锰数天后又降到0.05 mg·L~(-1)以下;出水氨氮随进水氨氮的升高而升高。沿程分析发现,进水溶解氧充足时,氨氮和锰的氧化速率没有受到影响;但进水溶解氧不足时,氨氮和锰的氧化速率明显降低;铁的去除速率不受溶解氧的限制。生物净化滤柱可以在较低的溶解氧条件下运行,从而降低能耗。
The biological removal of iron, manganese and manganese removal ammonia nitrogen filter column, which is mature and stable for a certain period of time, was used to investigate the effect of ammonia concentration on the removal efficiency of iron, manganese and ammonia nitrogen. The results showed that the removal efficiencies of iron, manganese and ammonia nitrogen were unaffected when the influent ammonia concentration gradually increased from about 1.2 mg · L -1 to about 2.0 mg · L -1. When the ammonia nitrogen in the influent exceeds 2 mg · L -1, the influent dissolved oxygen is insufficient and the removal efficiency of iron is not affected. The biological removal of manganese is inhibited by the nitrite nitrogen produced during the increase of ammonia nitrogen, However, manganese oxidizing bacteria could oxidize manganese under low DO condition, and the output of manganese dropped to less than 0.05 mg · L -1 after a few days. The ammonia nitrogen in effluent increased with the increase of NH 4 -N Rise and rise. The results showed that the oxidation rate of ammonia nitrogen and manganese was not affected when the dissolved oxygen was sufficient, but the oxidation rate of ammonia nitrogen and manganese decreased obviously when the dissolved oxygen was insufficient. The removal rate of iron was not limited by dissolved oxygen. Bio-purification columns operate at lower dissolved oxygen levels, reducing energy consumption.