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| Bacillus megaterium and citric acid enhanced the remediation of Cd-contaminated soil by Celosia argentea Linn |
| Received:August 29, 2020 |
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| KeyWord:citric acid;Bacillus megaterium;Celosia argentea Linn;phytoremediation;Cd contamination soil |
| Author Name | Affiliation | E-mail | | ZHANG Bing | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China | | | LIU Jie | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China
Mining Geological Environment Rehabilitation Engineering Technology Innovation Center, Southern Shishan Region, Ministry of Natural Resources, Guilin 541004, China | liujie@glut.edu.cn | | JIANG Ping-ping | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China | jiangpp@glut.edu.cn | | JIANG Xu-sheng | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China | | | DING Zhi-fan | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China | | | CHENG Yan | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China | | | LEI Ling | Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China | |
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| Abstract: |
| To study the effects of citric acid and Bacillus megaterium on the remediation of Cd-contaminated soil by Celosia argentea and optimize their application rates to improve remediation efficiency, a pot experiment using a 4×4 factorial design was conducted to study the effect of citric acid(0, 2.5, 5, 7.5 mmol·kg-1, and 10 mmol·kg-1) and B. megaterium(0, 108, 109 cfu·kg-1, and 1010 cfu·kg-1) on phytoremediation of Cd-contaminated soil by C. argentea. The results indicated that the application of B. megaterium and citric acid significantly increased the biomass, Cd concentration, and Cd accumulation in the roots, stems, and leaves of C. argentea compared with the control(without B. megaterium and citric acid addition). Application of 109 cfu·kg-1 B. megaterium and 5 mmol·kg-1 citric acid had the best effects, and increased leaf, stem, root, and shoot biomass by 48.7%, 43.3%, 78.8%, and 45.6%, respectively compared with the control. With 109 cfu·kg-1 B. megaterium + 5 mmol·kg-1 citric acid treatment, the Cd concentrations in the leaves, stems, and roots increased by 75.8%, 76.3%, and 74.6%, respectively, and Cd accumulation in shoots increased by 159%. The highest Cd accumulation in the shoots and the rate of Cd removal were 1.03 mg·pot-1 and 21.02%, respectively when 109 cfu·kg-1 B. megaterium and 5 mmol·kg-1 citric acid were applied to the soil. Therefore, the application of citric acid and B. megaterium at a concentration of 5 mmol·kg-1 and 109 cfu·kg-1, respectively is most effective for improving the remediation efficiency of Cd-contaminated soil using C. argentea. |
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