Abstract：
Constructed wetlands (CWs) are widely used to polish the effluent of wastewater treatment plants and micro-polluted river or lake water. However, the impact of large-scale applications of CWs on carbon emissions is unclear. In this study, the carbon footprints of two full-scale hybrid CWs were determined based on life cycle assessment (LCA). Results showed that the carbon emission of CW ranged from 0.10 to 0.14 kg CO2-eq/m3, and was significantly correlated with the influent chemical oxygen demand loads and electricity consumption. However, CW would approach carbon neutrality during the service period when taking plant carbon sequestration into consideration. Compared with other advanced wastewater treatment technologies, CWs showed significant low-carbon emission and cost-effective benefits. This study clarified the role of CWs in the carbon cycle and would provide guidance for the construction and management of CWs.
摘要：
人工湿地（CWs）被广泛用于净化污水处理厂的废水和微污染的河流或湖泊水。然而,大规模应用CW对碳排放的影响尚不清楚。在这项研究中,基于生命周期评估（LCA）确定了两个全尺度混合CW的碳足迹。结果表明，CW的碳排放量范围为0.10至0.14kgCO2-eq/m3，与进水化学需氧量负荷和用电量显着相关。然而,考虑到工厂碳固存，CW将在服务期间接近碳中和。与其他先进的污水处理技术相比，CW显示出显著的低碳排放和成本效益。这项研究阐明了CW在碳循环中的作用，并将为CW的构建和管理提供指导。
