title: Effects of influent C/N ratios on wastewater nutrient removal and simultaneous greenhouse gas emission from the combinations of vertical subsurface flow constructed wetlands and earthworm eco-filters for treating synthetic wastewater.
abstract: This research focused on the nutrient removal and the simultaneous CO2, CH4, and N2O emission rates of various combinations of vertical subsurface flow constructed wetlands (VSFCWs) and earthworm eco-filters (EEs) under different influent C/N ratios in synthetic wastewater. The optimal parameters for nutrient removal were influent C/N ratios of 5 : 1 and 10 : 1 as well as the combination VSFCW-EE. Relatively low values of greenhouse gas (GHG) emission rates measured in situ were obtained at a C/N ratio of 5 : 1. The emission rates of CH4 and N2O were considerably lower than that of CO2. The VSFCW-EE and EE-VSFCW combinations showed similar GHG emission results. The C/N ratio of 5 : 1 and the VSFCW-EE combination exhibited the highest nutrient removal efficiency with the lowest GHG emission rate. Wastewater nutrient removal and GHG emission were both high during summer (June to August) and low during winter (December to February).
authors: College of Biological and Chemical Engineering, Jiaxing University, Jiaxing 314001, China. zyjun2007@126.com.
authors: Yongjun
authors: Y
authors: Zhao
authors: Yuejin
authors: Y
authors: Zhang
authors: Zhigang
authors: Z
authors: Ge
authors: Changwei
authors: C
authors: Hu
authors: Hui
authors: H
authors: Zhang
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000818:Animals; D002244:Carbon / Q000032:analysis*; D002245:Carbon Dioxide / Q000032:analysis; D004784:Environmental Monitoring; D008697:Methane / Q000032:analysis; D009584:Nitrogen / Q000032:analysis*; D009585:Nitrogen Dioxide / Q000032:analysis; D009835:Oligochaeta; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D053833:Wetlands
chemical_list: D000393:Air Pollutants; D002244:Carbon; D002245:Carbon Dioxide; D008697:Methane; D009584:Nitrogen; D009585:Nitrogen Dioxide; D062065:Wastewater