铁碳投加量对人工湿地温室气体排放的影响  

Effects of Iron-Carbon Dosage on the Greenhouse Gases Emission in Constructed Wetlands

作　　者：王佳康 冯民权[1] 何秋玫 WANG Jiakang;FENG Minquan;HE Qiumei(State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,School of Water Resources and Hydropower,Xi’an University of Technology,Xi’an 710048,China)

机构地区：[1]西安理工大学水利水电学院,西北旱区生态水利国家重点实验室,陕西西安710048

出　　处：《环境科学与技术》2025年第3期169-176,共8页Environmental Science & Technology

基　　金：西安理工大学博士创新基金项目(252072309)。

摘　　要：为探究铁碳填料投加量对人工湿地温室气体排放的影响,在室内构建5组不同铁碳投加比例的人工湿地:湿地A(0%)、湿地B(5%)、湿地C(10%)、湿地D(15%)、湿地E(20%),监测其污染物去除和温室气体排放情况。结果表明,铁碳填料能有效提高COD、NH_(4)^(+)-N、NO_(3)^(-)-N、TN的去除效果,去除率分别达到80%、85%、96%、85%以上,但铁碳的投加量超过15%时,对污染物的去除效率则会下降。铁碳填料对人工湿地中的温室气体减排也有一定作用,减排效果随投加量的增加呈现先上升后下降的趋势。湿地C和湿地D的铁碳投加量分别能实现最低的CH_(4)和N_(2)O排放通量,分别为0.126和0.276 mg/(m^(2)·h)。从降低全球增温潜势(GWP值)来看,湿地C具有最佳减排效果,GWP值为79.776 mg/(m^(2)·h),比对照组降低了76.99%。综合考虑下,建议人工湿地中铁碳填料的投加比例为10%。In order to explore the effect of iron-carbon filler dosage on greenhouse gas emissions from constructed wetlands,five groups of constructed wetlands with different iron-carbon dosing ratios were constructed indoors:Wetland A(0%),Wetland B(5%),Wetland C(10%),Wetland D(15%),and Wetland E(20%),and their pollutant removal and greenhouse gas emissions were monitored.The results show that the iron-carbon filler can effectively improve the removal efficiency of COD,NH_(4)^(+)-N,NO_(3)^(-)N,TN,and the removal rates are more than 80%,85%,96%and 85%,respectively.However,when the dosage of iron-carbon is more than 15%,the removal efficiency of pollutants will decrease.Iron-carbon filler also has a certain effect on greenhouse gas emission reduction in constructed wetlands,and the emission reduction effect increases first and then decreases with the increase of dosage.The iron and carbon dosage of Wetland C and Wetland D can achieve the lowest CH_(4) and N_(2)O emission fluxes,which are 0.126 mg/(m^(2)·h)and 0.276 mg/(m^(2)·h)respectively.From the perspective of reducing GWP value,Wetland C has the best emission reduction effect,and the GWP value is 79.776 mg/(m^(2)·h),which is 76.99%lower than that of the control group.Under comprehensive consideration,it is recommended that the addition ratio of iron-carbon filler in constructed wetland is 10%.

关 键 词：人工湿地 铁碳填料 污染物去除 温室气体 

分 类 号：X703[环境科学与工程—环境工程]