Electrokinetic-assisted Phytoremediation of Soil Cadmium Pollution in Paddy Fields under Polarity Exchange Technology

被引：0
|
作者：
Luan Y. [1 ,2 ]
Xu J. [1 ,2 ]
Li Y. [1 ,2 ]
Hu Z. [1 ,3 ]
Wang H. [1 ,2 ]
Wang Y. [4 ]
Xu X. [5 ]
机构：
[1] College of Agricultural Science and Engineering, Hohai University, Nanjing
[2] National Key Laboratory of Water Disaster Prevention, Hohai University, Nanjing
[3] Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing
[4] Kunshan Water Affairs Bureau, Kunshan
[5] Caoyou Water Resources Bureau, Caoyou
来源：
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2024年 / 55卷 / 03期
关键词：
cadmium; control irrigation; electrokinetic remediation; phytoremediation; polarity reversal; rice;
D O I：
10.6041/j.issn.1000-1298.2024.03.033
中图分类号：
学科分类号：
摘要：
The feasibility of electrokinetic-assisted phytoremediation ( EKPR) with polarity reversal to remove cadmium (Cd) contaminants from paddy soils under controlled irrigation was investigated. The experiments were carried out in cuboid pots powered by solar energy. The rice crops were planted near the electrodes under controlled irrigation, and the Scirpus tabernaemontani was planted as hyperaccumulator between two rows of rice plants. The results showed that H and OH produced by electrolysis reactions could be directly neutralized by the polarity reversal operation, thus effectively avoiding the polarization of soil pH value. The soil current was varied from 0. 08A to 0. 36A, indicating that polarity exchange and high soil water content effectively ensured the number and mobility of free-moving ions in soils, which could drive heavy metal migration. Compared with CK treatment, EKPR treatment significantly increased the root dry biomass of Scirpus tabernaemontani by 34.93%. EKPR treatment significantly reduced the root and brown rice dry biomasses by 17.21% ~ 30. 16% and 16. 18% ~ 22. 28% respectively, while significantly increased the leaf and stem dry biomasses by 3. 82% ~ 13. 17% and 7. 59% ~ 30. 91% , respectively. EKPR treatment increased the Cd content in root and ground parts by 15. 49% ~ 22. 45% and 33. 30% ~ 35. 45% , respectively. The content of Cd in rice root and brown rice was decreased by 14.48% ~ 35. 06% and 39. 04% ~ 57.43% , respectively. The electrokinetic-assisted phytoremediation technology could increase the Cd enrichment of Scirpus tabernaemontani and decrease the Cd enrichment of rice crops. Compared with CK treatment, the bioenrichment of Cd in Scirpus tabernaemontani under EKPR treatment was significantly increased by 46. 48% , and that in rice crops was significantly decreased by 24. 75% . At the end of EKR experiments, the soil Cd content near rice roots was decreased by 16. 33% ~ 19. 14% . The results showed that under controlled irrigation, the electrokinetic-assisted phytoremediation with polarity reversal was a feasible method for cadmium contaminants in paddy soils. It had a good application prospect and practical significance to use electrokinetic-assisted phytoremediation to achieve soil purification in crop production. © 2024 Chinese Society of Agricultural Machinery. All rights reserved.
引用
收藏
页码：331 / 339
页数：8
相关论文
共 34 条
  • [1] QIN G W, NIU Z D, YU J D, Et al., Soil heavy metal pollution and food safety in China
  • [2] effects, sources and removing technology [J], Chemosphere, 267, (2021)
  • [3] YANG Q Q, LI Z Y, LU X N, Et al., A review of soil heavy metal pollution from industrial and agricultural regions in China
  • [4] pollution and risk assessment J], Science of the Total Environment, 642, pp. 690-700, (2018)
  • [5] HU Y N, CHENG H F, TAO S., The challenges and solutions for cadmium-contaminated rice in China
  • [6] a critical review [J], Environment International, 92, 93, pp. 515-532, (2016)
  • [7] JIN Keda, PENG Yuzhi, YANG Gaozhong, Et al., Fertilizer efficiency and heavy metal risk analysis of continuous application of biogas fertilizer in vegetable cultivation [J], Transactions of the Chinese Society for Agricultural Machinery, 54, 8, pp. 359-370, (2023)
  • [8] TEFERA W, TANG L, LU L L, Et al., Rice cultivars significantly mitigate cadmium accumulation in grains and its bioaccessibility and toxicity in human HL - 7702 cells [J], Environmental Pollution, 272, (2021)
  • [9] NOGUEIRA T, MURAOKA T, SILVEIRA L K, Et al., Comparing soil-to-plant cadmium ( C d ) transfer and potential human intake among rice cultivars with different Cd tolerance levels grown in a tropical contaminated soil[J], Environmental Monitoring and Assessment, 194, 1, pp. 20-33, (2022)
  • [10] LIU L W, LI W, SONG W P, Et al., Remediation techniques for heavy metal-contaminated soils
1234