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转换电极的电动力强化植物修复高浓度砷污染土壤

周丽玮,  王航,  刘阳生

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引用本文: 周丽玮, 王航, 刘阳生. 转换电极的电动力强化植物修复高浓度砷污染土壤[J]. 环境工程, 2020, 38(10): 228-233. doi: 10.13205/j.hjgc.202010036
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Citation: ZHOU Li-wei, WANG Hang, LIU Yang-sheng. EFFECT OF ELECTRODE-ORIENTATED ELECTROKINETIC ENHANCEMENT ON PHYTOREMEDIATION ON ARSENIC CONTAMINATED SOIL[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(10): 228-233. doi: 10.13205/j.hjgc.202010036
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转换电极的电动力强化植物修复高浓度砷污染土壤

doi: 10.13205/j.hjgc.202010036

  • 北京大学 环境科学与工程学院, 北京 100871

基金项目: 

深圳市科创委重点基础项目"重金属污染土壤的生物-电动力耦合修复技术"（基20160140）。

详细信息
    作者简介:

    周丽玮(1994-),女,硕士研究生,主要研究方向为土壤重金属污染修复。1601214964@pku.edu.cn

    通讯作者:

    刘阳生(1968-),男,博士,主要研究方向为固废处置与资源化。yshliu@pku.edu.cn

EFFECT OF ELECTRODE-ORIENTATED ELECTROKINETIC ENHANCEMENT ON PHYTOREMEDIATION ON ARSENIC CONTAMINATED SOIL

  • College of Environmental Science and Engineering, Peking University, Beijing 100871, China

摘要

    摘要
  • 摘要: 电极转换下，以Capsicum annuum L.为对象探讨电动力强化的植物修复高浓度砷污染土壤效果。结果表明：对照组土壤pH降低，实验组升高。对照组土壤中砷浓度从（524.1±5.6） mg/kg降低为（500.5±8.3） mg/kg，实验组不同区域土壤砷浓度分别为（179.8±10.6），（674.9±5.43），（512.8±7.3） mg/kg。相较于对照组，实验组植物对砷的吸收量分别增加了-18.1%、282.8%和170.3%。对照组、实验组区域1、2、3的土壤和根际土壤砷浓度之比分别为2.62、0.64、1.48和1.26，电场增高了植物根系附近的砷浓度。对照组、实验组区域1、2、3土壤第5天的残渣态砷占比为55.64%、34.99%、39.06%和0%；对照组、实验组第5天阴极和第10天阴极附近土壤，结晶水铁铝氧化物结合态和残渣态砷占比为67.45%、0%和8.88%；体现了电场对土壤重金属形态的活化作用。实验组修复10 d的电耗成本为79.5元/m3，具备一定经济优势。
    Abstract: In this paper, the effect of electrode-orientated electrokinetic enhancement on phytoremediation on arsenic contaminated soil was investigated based on Capsicum annuum L. The results showed that soil pH decreased in the control group and increased in the experimental group. The soil arsenic concentration in the control group decreased from (524.1±5.6) mg/kg to (500.5±8.3) mg/kg, and the soil arsenic concentration in different areas of the experimental group was (179.8±10.6), (674.9±5.43), (512.8±7.3) mg/kg, respectively. Compared with the control group, the amount of arsenic absorbed by plants in the experimental group increased by -18.1%, 282.8% and 170.3%, respectively. The ratio of arsenic concentration in soil and rhizosphere in control group and experimental group 1, 2 and 3 was 2.62, 0.64, 1.48 and 1.26, respectively. The electric field increased the arsenic concentration near plant roots. In the control group and the experimental group, the residue arsenic content of the fifth day was 55.64%, 34.99%, 39.06% and 0%. In the soil of experimental group, and near the cathode on the 5th and 10th day of the control group, the proportions of Fe/Al oxide binding state and residue arsenic in the crystallized water were 67.45%, 0% and 8.88%, respectively. It reflected the activation effect of electric field on soil heavy metal forms. The power consumption of the experimental group for 10 days repairing was RMB 79.5/m3, with considerable economical advantages.
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