Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; College of Environment and Ecology, Chongqing University, Chongqing 400045, China.
Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China; College of Environment and Ecology, Chongqing University, Chongqing 400045, China; Chongqing Municipal Institute of Municipal Design and Research, Chongqing 400044, China.
Bioresour Technol. 2020 May;303:122908. doi: 10.1016/j.biortech.2020.122908. Epub 2020 Jan 27.
Biochar is widely used for nutrient removal in constructed wetlands (CWs); however, its influence on greenhouse gas (GHG) emissions from CWs remains unclear. Here, biochar was used to mitigate the global warming potential (GWP) from CWs and promote the removal of contaminants from simulated domestic wastewater under different influent chemical oxygen demand to nitrogen ratios (COD/N = 3, 6, 9, 12). Results demonstrated that biochar could improve the removal of COD, NH- N, and TN. The average NO and CO fluxes were significantly lower and CH fluxes were higher in biochar-added CWs than those in none-biochar CWs. Biochar reduced GWP values of NO and CH from 18.5% to 24.0%. NO fluxes and GWP decreased, while CH and CO fluxes increased as COD/N ratios increased. Additionally, biochar increased the abundance of Geobacter and denitrifiers such as Hydrogenophaga. Overall, biochar could not only promote the removal of nutrients but also mitigate GWP in CWs.
生物炭广泛应用于人工湿地（CWs）中的养分去除；然而，其对 CWs 温室气体（GHG）排放的影响尚不清楚。在这里，生物炭被用于减轻 CWs 的全球变暖潜势（GWP），并促进模拟生活污水中污染物的去除，进水化学需氧量与氮比（COD/N = 3、6、9、12）不同。结果表明，生物炭可以提高 COD、NH-N 和 TN 的去除率。与无生物炭 CWs 相比，添加生物炭的 CWs 中的平均 NO 和 CO 通量显著降低，CH 通量较高。生物炭将 NO 和 CH 的 GWP 值从 18.5%降低到 24.0%。随着 COD/N 比值的增加，NO 通量和 GWP 降低，而 CH 和 CO 通量增加。此外，生物炭增加了 Geobacter 和 Hydrogenophaga 等反硝化菌的丰度。总的来说，生物炭不仅可以促进养分的去除，还可以减轻 CWs 的 GWP。
