Removal of perchlorate by a lab-scale constructed wetland using achira (Canna indica L.)

被引:0
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作者
Dongqin Li
Bingqian Li
Haishuo Gao
Xinyu Du
Junhao Qin
Huashou Li
Hongzhi He
Guikui Chen
机构
[1] South China Agricultural University,College of Resources and Environment
[2] Guangdong Provincial Key Laboratory of Eco-Circular Agriculture,undefined
来源
Wetlands Ecology and Management | 2022年 / 30卷
关键词
Perchlorate; Biodegradation; Constructed wetland; Achira; Microorganism;
D O I
暂无
中图分类号
学科分类号
摘要
Achira (Canna indica L.) has not yet been tested for its potential in removing perchlorate (ClO4−) from wastewater. In this study, constructed wetlands with and without achira were used to investigate the removal efficiency and removal mechanism of perchlorate. The results showed that more ClO4− was removed by the wetlands with achira relative to those without. Perchlorate removal in the wetlands without achira decreased with time, whereas perchlorate in the wetlands with achira was stably removed. In terms of ClO4− content, the achira tissues were in the descending order of: leaf > aerial stem > flower or rhizome > root. Perchlorate was concentrated in leaves (more than 55.8%) rather than in root (less than 0.67%). Mass balance calculation showed that plant uptake accounted for 5.81–7.34% of initial ClO4− input, while microbial degradation accounted for 29.39–62.48%. The wetlands with achira were favorable for soil microorganism growth and proliferation and in turn ClO4− biodegradation. Furthermore, the effluent pH increased in achira wetland columns and in turn promoting ClO4− removal. The results indicating that the wetlands with achira promote ClO4− removal by improving the rhizosphere environment.
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页码:35 / 45
页数:10
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