摘要
城镇污水处理过程是温室气体氧化亚氮(N2O)的重要人为释放源。实验通过对青岛市某城镇污水处理厂SBR工艺污水处理构筑物水面释放的气体进行长期系统的通量监测,分析研究了N2O气体的释放变化规律,测算了N2O的释放量和释放比例,同时探讨了影响N2O释放的因素。结果表明:当SBR进行好氧曝气时N2O释放通量较高,在进行沉淀时N2O释放量明显降低,N2O的日释放量约为1.73kg/d,约占所去除总氮的1.1%,影响SBR系统N2O释放的主要因素为溶解氧(DO),当DO浓度低于1.5mg/L时,好氧曝气阶段的N2O释放通量明显升高。
Nitrous oxide（N2O） emissions from SBR wastewater treatment systems are measured in a full-scale municipal wastewater treatment plant in Qingdao.It was found that N2O emissions are significant when SBRs are run in aerobic phase,with a maximum flux of 99.0mg/（m2·h）and aminimum flux of 23.4mg/（m2·h）.N2O emissions significantly reduce when SBRs are settling and the flux range is 2.8~19.5mg/（m2·h）.Daily N2O flux from the SBRs is 1.73kg/d,which accounts for approximately 1.1% of the total nitrogen removed.Dissolved oxygen concentration in wastewater is the main factor influencing N2O emissions from the SBRs.N2O emissions increase significantly when DO is below1.5mg/L during aerobic phase.
出处
《山东建筑大学学报》
2012年第1期43-46,54,共5页
Journal of Shandong Jianzhu University
关键词
氧化亚氮
SBR
污水处理厂
释放通量
Nitrous oxide
SBR
wastewater treatment plant
emission flux
