Enhanced nitrogen removal and greenhouse gas reduction via activated carbon coupled iron-based constructed wetlands

化学 反硝化细菌 硝酸盐 硝酸还原酶 环境化学 氮气 污水处理 废水 活性炭 黄铁矿 反硝化 人工湿地 硫杆菌 环境工程 硫黄 环境科学 矿物学 有机化学 吸附
作者
Jianjun Lian,Pei Wu,Fei Yang,Bo Chen,Yulai Wang,Guanhua Meng,Qiaoping Kong,Jingru Fang,Haiming Wu
出处
期刊:Journal of water process engineering [Elsevier BV]
卷期号:66: 106098-106098 被引量:1
标识
DOI:10.1016/j.jwpe.2024.106098
摘要

Constructed wetlands (CWs) have been widely used to remove nitrogen in the effluent from sewage plants. Still, the removal capacity of nitrate (NO3−-N) in CWs is unsatisfactory due to the insufficient electron donor. This study explored the role of activated carbon (AC) in nitrogen removal and greenhouse gas (GHG) emissions reduction in different iron-based CWs. Long-term experimental results showed that pyrite and sponge iron-based CWs had higher NO3−-N removal rates (98.18 % and 94.10 %). Compared with the control group, AC promoted their total nitrogen (TN) removal efficiency (78.87–87.59 %) and reduced GHG emissions (CO2: 3.79–4.11 %, N2O: 2.97–8.78 %, CH4: 9.93–10.73 %). Moreover, AC not only promoted the values of electron transfer system activity (ETSA), the activity of nitrate reductase and nitrite reductase, but also significantly increased the microbial diversity and abundance of the substrate layer in pyrite/SI- based CWs. The relative abundance of the dominant bacteria in CWs with pyrite coupling with AC (PC-CW) was the highest (nirS: 77.60 %, nosZ: 88.98 %) compared with the other CWs. The higher relative abundance of Dechloromonas and Thiobacillus in PC-CW indicated that the composite substrates of pyrite and AC promoted the extracellular electron transfer of denitrifying microorganisms. This study provides new insights into optimizing inorganic electron donors to improve the removal of NO3−-N and the reduce of GHG emissions in CWs for low C/N wastewater treatment.
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