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| Effects of voltage on the efficacy of domestic sewage treatment by constructed wetlands |
| Received:October 27, 2020 |
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| KeyWord:constructed wetland;physiologic characteristics of plants;microbial activity;voltage;domestic sewage |
| Author Name | Affiliation | E-mail | | LUO Xin-yi | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China | | | YE Yan-chao | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China | | | SHI Yu-cui | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China | | | YOU Shao-hong | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China | youshaohong@glut.edu.cn |
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| Abstract: |
| To enhance the performance of constructed wetlands for the removal of pollutants, combined applied voltage with constructed wetlands, and explored the optimal voltage and operating conditions of wetlands systems. Our results showed a positive effect following CW-0.5 and CW-1 treatments on plant physiological characteristics and a better growth trend was observed than that of the control group. Following the CW-2 treatment, the contents of chlorophyll in plant leaves decreased, soluble protein, superoxide dismutase（SOD）, peroxidase（POD）, malondialdehyde（MDA）, and CAT increased in plant leaves. Optimal operating conditions of constructed wetlands system under applied voltage were 2 days with hydraulic retention time at 1 V and the removal efficiency of chemical oxygen demand （COD）, ammonia（NH4+-N）, total nitrogen（TN）and total phosphorus（TP） were 95.2%,92.4%,85.9%, and 98.2%, respectively. Compared with the control group, these efficiencies increased by 9.3%, 6.9%, 10.3%, and 5.3%, respectively. At CW-2 disposal, microbial lactate dehydrogenase（LDH）and protein levels increased by 10% and 21%, respectively, while adenosine triphosphate（ATP）concentration decreased by 14% compared with the control group; moreover, microbial diversity and abundance reduced and microbial activity was inhibited. Thus, this study showed that suitable voltage can promote plant growth and development, improve microbial activity and diversity, and strengthen the performance of constructed wetlands systems to remove pollutants. |
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