Pan Mei, Zhao Jun, Zhen Shucong, Heng Sheng, Wu Jie
College of Environmental Science and Engineering, Yancheng Institute of Technology, Yingbin Road #9, Yancheng 224003, China E-mail:
Nanjing University of Information Science & Technology, Ningliu Road #219, Nanjing 210044, China.
Water Sci Technol. 2016;74(3):655-62. doi: 10.2166/wst.2016.212.
Excess nitrogen in urban river networks leading to eutrophication has become one of the most urgent environmental problems. Combinations of different aeration and biofilm techniques was designed to remove nitrogen from rivers. In laboratory water tank simulation experiments, we assessed the removal efficiency of nitrogen in both the overlying water and sediments by using the combination of the aeration and biofilm techniques, and then analyzed the transformation of nitrogen during the experiments. Aeration (especially sediment aeration) combined with the biofilms techniques was proved efficient in removing nitrogen from polluted rivers. Results indicated that the combination of sediment aeration and biofilms, with the highest nitrogen removal rate from the overlying water and sediments, was the most effective combined process, which especially inhibited the potential release of nitrogen from sediments by reducing the enzyme activity. It was found that the content of dissolved oxygen in water could be restored on the basis of the application of aeration techniques ahead, and the biofilm technique would be effective in purifying water in black-odor rivers.
城市河网中过量氮导致的富营养化已成为最紧迫的环境问题之一。设计了不同曝气和生物膜技术的组合来去除河流中的氮。在实验室水箱模拟实验中，我们通过使用曝气和生物膜技术的组合评估了上覆水和沉积物中氮的去除效率，然后分析了实验过程中氮的转化。曝气（尤其是底泥曝气）与生物膜技术相结合被证明对污染河流中的氮去除有效。结果表明，底泥曝气和生物膜的组合对上覆水和沉积物的氮去除率最高，是最有效的组合工艺，尤其通过降低酶活性抑制了底泥中氮的潜在释放。研究发现，在先行应用曝气技术的基础上可以恢复水中溶解氧的含量，生物膜技术对黑臭河流的水体净化有效。
