针对重金属锌和镉污染的低渗透性高岭土,采用电动土工塑料排水板(EKG)作为电极材料,通过自制模型试验装置研究了电动修复中电势梯度、通电时间、含水率对重金属去除率的影响,确定电动修复的最优试验条件。在最优试验条件下,开展了电极材料、电势梯度对不同种类重金属去除效果影响的试验研究。结果表明:随着修复时间的增长,阳极处重金属污染物逐渐减少,阴极处重金属污染物富集逐渐增加;试验条件相同情况下,重金属污染物Cd的除去率明显高于Zn;电势梯度越大,重金属Zn离子的去除率越高;电动土工塑料排水板作为电极的电动修复重金属污染土的效果要优于石墨电极。研究有助于揭示电动修复重金属污染土的效果和机理,为电动生态环境修复技术的应用提供技术支持。
Abstract
To remediate low-permeability kaolin contaminated with heavy metals like zinc and cadmium, we developed a model test apparatus with electrokinetic geosynthetics (EKG) drainage plate as the electrode material. The study aimed to investigate the impact of potential gradient, electrification time, and moisture content on the removal rate of heavy metals during electric remediation, and on this basis, to determine the optimal experimental conditions. Under the optimal conditions, we conducted experimental studies to examine the effects of electrode materials and potential gradients on the removal efficiency of various heavy metals. Findings revealed that with increasing remediation time, heavy metal pollutants at the anode gradually decreased, while their concentration at the cathode gradually increased. Under the same experimental conditions, the removal rate of cadmium (Cd) was significantly higher than that of zinc (Zn). Moreover, a higher potential gradient resulted in a greater removal rate of Zn ions. Notably, using EKG as electrodes exhibited a more effective remediation effect on heavy metal-contaminated soil compared to graphite electrodes. This research contributes to the understanding of the effects and mechanisms of EKG remediation on heavy metal-contaminated soil, and provides important technical support for the application of EKG remediation technology.
关键词
电动土工塑料排水板 /
重金属 /
电势梯度 /
含水率 /
生态环境修复技术 /
高岭土
Key words
electric geoplastic drainage board /
heavy metals /
potential gradient /
water content /
ecological environment restoration technology /
kaolin
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参考文献
[1] 周东美, 邓昌芬. 重金属污染土壤的电动修复技术研究进展[J]. 农业环境科学学报, 2003, 22(4): 505-508.(ZHOU Dong-mei, DENG Chang-fen. Review: Electrokinetic Remediation of Heavy Metal Contaminated Soil[J]. Journal of Agro-Environmental Science, 2003, 22(4): 505-508.(in Chinese))
[2] 储陆平, 周书葵, 荣丽杉, 等. 电动修复重金属污染土壤的研究进展[J]. 应用化工, 2020, 49(11): 2853-2858, 2863.(CHU Lu-ping, ZHOU Shu-kui, RONG Li-shan, et al. Research Progress on Electric Remediation of Heavy Metal Contaminated Soil[J]. Applied Chemical Industry, 2020, 49(11): 2853-2858, 2863.(in Chinese))
[3] 吴燕芳. 重金属污染土壤的修复技术研究进展及发展前景[J]. 再生资源与循环经济, 2013, 6(5): 39-42.(WU Yan-fang. Research Progress and Develop Prospects of Recovery Technique of Heavy Metal Polluted Soil[J]. Recyclable Resources and Circular Economy, 2013, 6(5): 39-42.(in Chinese))
[4] 郑燕如. 污染土壤修复技术研究[J]. 中国新技术新产品, 2014(7): 177-178.(ZHENG Yan-ru. Study on Remediation Technology of Contaminated Soil[J]. China New Technologies and Products, 2014(7): 177-178.(in Chinese))
[5] 廖天录, 廖天江, 吕麟华. 植物修复技术在重金属污染土壤中的应用[J]. 北京农业, 2015(17): 192.(LIAO Tian-lu, LIAO Tian-jiang, LYU Lin-hua. Application of Phytoremediation Technology in Heavy Metal Contaminated Soil[J]. Beijing Agriculture, 2015(17): 192.(in Chinese))
[6] 哈斯亚提汗·阿布都拉, 刘忠渊. 植物修复重金属污染土壤的研究进展[J]. 安徽农业科学, 2013, 41(22): 9247-9249.(HASIYATIHAN A, LIU Zhong-yuan. Research Progress on Phytoremediation of Heavy Metal Polluted Soil[J]. Journal of Anhui Agricultural Sciences, 2013, 41(22): 9247-9249.(in Chinese))
[7] 王 银,王光辉,胡苏杭.重金属和有机污染土壤植物增效修复技术研究进展[J].安徽农业科学,2014,42(16):5074-5076,5108.(WANG Yin,WANG Guang-hui,HU Su-hang.Application of Enhanced Phytoremediation in Contaminated Soil by Heavy Metals and Organic Pollutants[J]. Journal of Anhui Agricultural Sciences,2014,42(16):5074-5076,5108.(in Chinese))
[8] 刘惠君, 刘维屏. 农药污染土壤的生物修复技术[J]. 环境污染治理技术与设备, 2001(2): 74-80.(LIU Hui-jun, LIU Wei-ping. Bioremediation Technology of Pesticide Contaminated Soils[J]. Techniques and Equipment for Environmental Pollution Control, 2001(2): 74-80.(in Chinese))
[9] 骆永明. 金属污染土壤的植物修复[J]. 土壤, 1999, 31(5): 261-265, 280.(LUO Yong-ming. Phytoremediation of Metal Contaminated Soil[J]. Soils, 1999, 31(5): 261-265, 280.(in Chinese))
[10]蒋小红, 喻文熙, 江家华, 等. 污染土壤的物理/化学修复[J]. 环境污染与防治, 2006, 28(3): 210-214.(JIANG Xiao-hong, YU Wen-xi, JIANG Jia-hua, et al. Physical/Chemical Remediation of Contaminated Soil[J]. Environmental Pollution & Control, 2006, 28(3): 210-214.(in Chinese))
[11]席永慧, 梁穑嫁, 周光华. 重金属污染土壤的电动力学修复试验研究[J]. 同济大学学报(自然科学版), 2010, 38(11): 1626-1630.(XI Yong-hui, LIANG Se-jia, ZHOU Guang-hua. Electrokinetic Remediation Experimental Study of Heavy Metal Contaminated Soil[J]. Journal of Tongji University (Natural Science), 2010, 38(11): 1626-1630.(in Chinese))
[12]胡艳平,王振华,李青云,等.氯化钙-腐殖酸活化作用下土壤Cd的电动脱除性能[J]. raybet体育在线
院报,2021,38(8):60-65.(HU Yan-ping,WANG Zhen-hua, LI Qing-yun, et al. Performance of Electrokinetic Removal of Cadmium from Contaminated Soil Treated with CaCl2-humic Acid[J]. Journal of Yangtze River Scientific Research Institute, 2021, 38(8): 60-65.(in Chinese))
[13]胡 园,林 莉,胡艳平,等.农田土壤重金属Cd的环保淋洗剂筛选研究[J].raybet体育在线
院报,2019,36(9):23-28.(HU Yuan,LIN Li,HU Yan-ping,et al. Selecting Ferric Chloride as an Environmental-friendly Washing Agent for Heavy Metal Cadmium in Farmland Soil[J]. Journal of Yangtze River Scientific Research Institute, 2019, 36(9): 23-28.(in Chinese))
[14]万玉山,沈 梦,陈艳秋,等.Cd污染土壤的电动修复及其强化[J].环境工程学报,2018,12(7):2075-2083.(WAN Yu-shan,SHEN Meng,CHEN Yan-qiu, et al. Electrokinetic Remediation of Cd Contaminated Soil and Its Reinforcement Measures[J]. Chinese Journal of Environmental Engineering, 2018, 12(7): 2075-2083.(in Chinese))
[15]ALMEIRA O J, PENG C S, ABOU-SHADY A. Simultaneous Removal of Cadmium from Kaolin and Catholyte during Soil Electrokinetic Remediation[J]. Desalination, 2012, 30(17): 1-11.
基金
国家自然科学基金项目(52208329);安徽省引江济淮集团有限公司科技项目(YJJH-ZT-ZX-20230118528,YJJH-ZT-ZX-20191031216)
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