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

Achira ( Canna indica L.) has not yet been tested for its potential in removing perchlorate (ClO 4 − ) 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 ClO 4...

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Bibliographic Details
Published in:Wetlands ecology and management 2022-02, Vol.30 (1), p.35-45
Main Authors: Li, Dongqin, Li, Bingqian, Gao, Haishuo, Du, Xinyu, Qin, Junhao, Li, Huashou, He, Hongzhi, Chen, Guikui
Format: Article
Language:English
Subjects:
Aquatic plants
Artificial wetlands
Biodegradation
Biomedical and Life Sciences
Canna indica
Conservation Biology/Ecology
Environmental Law/Policy/Ecojustice
Freshwater & Marine Ecology
Hydrology/Water Resources
Leaves
Life Sciences
Marine & Freshwater Sciences
Mass balance
Microbial degradation
Microorganisms
Original Paper
Perchlorate
Perchloric acid
Proliferation
Removal
Rhizomes
Rhizosphere
Soil microorganisms
Uptake
Wastewater
Water Quality/Water Pollution
Wetlands
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Summary:Achira ( Canna indica L.) has not yet been tested for its potential in removing perchlorate (ClO 4 − ) 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 ClO 4 − 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 ClO 4 − 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 ClO 4 − 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 ClO 4 − biodegradation. Furthermore, the effluent pH increased in achira wetland columns and in turn promoting ClO 4 − removal. The results indicating that the wetlands with achira promote ClO 4 − removal by improving the rhizosphere environment.
ISSN:0923-4861
1572-9834
DOI:10.1007/s11273-021-09827-3