Proper C/N ratio enhances the effect of plant diversity on nitrogen removal and greenhouse effect mitigation in floating constructed wetlands

被引:2
|
作者
Xiang, Chenxu [1 ]
Du, Yuanyuan [1 ,4 ]
Han, Wenjuan [2 ]
Guan, Baohua [3 ]
Liu, Hua [1 ]
An, Yu [1 ]
Liu, Yu [1 ]
Jiang, Hang [1 ]
Chang, Jie [1 ]
Ge, Ying [1 ]
机构
[1] Zhejiang Univ, Coll Life Sci, 866 Yuhangtang Rd, Hangzhou 310058, Peoples R China
[2] Wenzhou Univ, Coll Life & Environm Sci, Wenzhou 325035, Peoples R China
[3] Chinese Acad Sci, State Key Lab Lake Sci & Environm, Nanjing Inst Geog & Limnol, Nanjing 210008, Peoples R China
[4] Huaxin Design Grp Co Ltd, Wuxi 214100, Peoples R China
基金
中国国家自然科学基金;
关键词
Species richness; Species identity; Plant uptake; Denitrification; Greenhouse gas; Bioenergy; WASTE-WATER TREATMENT; SPECIES-DIVERSITY; NUTRIENT REMOVAL; OXIDE EMISSIONS; CH4; EMISSIONS; ECOSYSTEM PRODUCTIVITY; GAS EMISSION; RICHNESS; MICROCOSMS; BIODIVERSITY;
D O I
10.1007/s11356-024-31985-z
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Treating wastewater with low carbon-to-nitrogen (C/N) ratios by constructed wetlands (CWs) is still problematic. Adding chemicals is costly and may cause secondary pollution. Configuring plant diversity in substrate-based CWs has been found to be a better way to treat low-C/N wastewater, but wastewater treatment in floating CWs needs to be studied. In this study, wastewater with C/N ratios of 5 and 10 were set in simulated floating CWs, and 9 combinations with plant species richness (SR) of 1, 3, and 4 were configured. The results showed that (1) increasing SR improved the total N mass removal (NMR) by 29% at a C/N ratio of 5 but not 10; (2) the presence of Oenanthe javanica in the microcosms increased the NMR by 13% and 20% with C/N ratios of 5 and 10, respectively; (3) increasing SR mitigated the net global warming potential (GWP) by 120% at a C/N ratio of 5 but not 10; and (4) a Hemerocallis fulva x O. javanica x Echinodorus parviflours x Iris hybrids mixture resulted in a high NMR and low net GWP. In summary, assembling plant diversity in floating CWs is an efficient and clean measure during the treatment of wastewater with a C/N ratio of 5.
引用
收藏
页码:12245 / 12256
页数:12
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