Department of Civil Engineering, University of British Columbia, Vancouver BC, V6T 124, Canada.
J Environ Sci (China). 2010;22(7):953-60. doi: 10.1016/s1001-0742(09)60204-7.
Hybrid system combines the nature of suspended growth and attached growth has been widely applied to wastewater treatment. In this research, the contributions to N transformation and N2O emission by biofilm and suspended sludge in the hybrid sequencing-batch reactor for a simultaneous nitrification, denitrification and phosphorus removal process were investigated. For the hybrid system, nitrification occurred mostly in the suspended sludge, while the biofilm played the major role in denitrification. The interaction of the biofilm and the suspended sludge in the same reactor resulted in a better overall nitrogen removal performance with simultaneous nitrification and denitrification. However, N2O emission was the main end product of nitrogen removal for the hybrid system; while it was N2 for the biofilm. The relative low N2O emissions from the pure biofilm and the pure suspended sludge corresponded to the relatively high nitrate at the end of the aeration period compared with the hybrid system.
混合系统结合了悬浮生长和附着生长的特性，已被广泛应用于废水处理。本研究考察了混合序批式反应器中生物膜和悬浮污泥对同步硝化反硝化除磷过程中氮转化和 N2O 排放的贡献。对于混合系统，硝化主要发生在悬浮污泥中，而生物膜在反硝化中起主要作用。同一反应器中生物膜和悬浮污泥的相互作用导致同步硝化反硝化的总氮去除性能更好。然而，对于混合系统，N2O 排放是氮去除的主要末端产物；而对于生物膜则是 N2。与混合系统相比，纯生物膜和纯悬浮污泥中相对较低的 N2O 排放量与曝气结束时相对较高的硝酸盐相对应。
