Manganese oxides and iron oxides have been widely introduced in constructed wetlands (CWs) for sewage treatment due to their extensiveness in nature and their ability to participate in various reactions, but their effects on greenhouse gas (GHG) emissions remain unclear. Here, a set of vertical subsurface-flow CWs (Control, Fe-VSSCWs, and Mn-VSSCWs) was established to comprehensively evaluate which are the better metal substrate materials for CWs, iron oxides or manganese oxides, through water quality and the global warming potential (GWP) of nitrous oxide (N₂O), methane (CH₄), and carbon dioxide (CO₂). The results revealed that the removal efficiencies of chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP) in Mn-VSSCWs were all higher than that in Fe-VSSCWs, and manganese oxides could almost completely suppress the CH₄ production and reduce GWP (from 8.15 CO₂-eq/m²/h to 7.17 mg CO₂-eq/m²/h), however, iron oxides promoted GWP (from 8.15 CO₂-eq/m²/h to 10.84 mg CO₂-eq/m²/h), so manganese oxides are the better CW substrate materials to achieve effective sewage treatment while reducing the greenhouse gas effect.

锰氧化物和铁氧化物由于其性质广泛和参与各种反应的能力已被广泛引入人工湿地（CWs）用于污水处理，但它们对温室气体（GHG）排放的影响尚不清楚。在这里，建立了一组垂直地下流 CWs（Control、Fe-VSSCWs 和 Mn-VSSCWs），以通过水质和全球变暖来综合评估 CWs、氧化铁或氧化锰的更好金属基底材料一氧化二氮 (N ₂ O)、甲烷 (CH ₄ ) 和二氧化碳 (CO ₂）。结果表明，Mn-VSSCWs对化学需氧量（COD）、总氮（TN）和总磷（TP）的去除效率均高于Fe-VSSCWs，并且锰氧化物几乎可以完全抑制CH ₄产生并降低 GWP（从 8.15 CO ₂ -eq/m ² /h 到 7.17 mg CO ₂ -eq/m ² /h），然而，铁氧化物促进 GWP（从 8.15 CO ₂ -eq/m ² /h 到10.84 mg CO ₂ -eq/m ² /h)，因此锰氧化物是实现有效污水处理同时减少温室气体效应的更好的 CW 基质材料。