Objective To investigate the purification effect of a combined system of rotating biological contactors and hybrid con-structed wetlands on polluted river water,as well as the emission characteristics of greenhouse gases during the treatment process,and to provide technical support for the application and promotion of biological and ecological technology.Methods With Liangtan River treatment project as the subject of investigation,the effect of the combined process in removing pollutants was analyzed,and the head-space and static box method were used to investigate the release pattern of greenhouse gases during the treatment process.Results Throughout the year,the combined process showed a removal rate exceeding 90％for ammonia nitrogen(NH4+-N),with an effluent concentration that met the Class Ⅱ standard in the Environmental Quality Standards for Surface Water(GB 3838-2002),and it also showed a good effect in removing total nitrogen(TN),total phosphorus(TP),and chemical oxygen demand(COD)and basically reached the Class V standard.CO2 was the primary greenhouse gas emitted by the combined process,and the release amount of gases displayed significant seasonal variations with greater emissions during the warm season.In addition,global warming potential(GWP)reached 2.00×104 g/d in the warm season,which was 2.10 times that in the cold season.The mean annual emissions of N2O,CH4,and CO2 were 2.61,70.64,and 1.77×104 mg/(m3·d),respectively.Conclusion The combined process of rotating biological con-tactors and hybrid constructed wetlands shows a synergistic effect in achieving efficient pollutant purification and greenhouse gas emis-sion reduction during the treatment of polluted river water.
关键词
生物转盘/人工湿地/受污染河水/温室气体/增温潜势
Key words
rotating biological contactors/constructed wetlands/polluted river water/greenhouse gases/global greenhouse po-tential
维普
万方数据