基于EKG电动脱水去除稻田土壤重金属Cd的试验研究
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摘要
为研究基于EKG电动脱水去除稻田土壤重金属镉(Cd)的效果,进行了土壤淋洗-电动脱水室内模拟试验,重点考察了FeCl_3淋洗后在不同电压梯度(1,2,3,4,5 V/cm)和不同电极间距(20, 30, 40, 50 cm)下,土壤各截面pH值的变化特点和电动脱水去除土壤Cd的效果。结果表明:电动脱水前后土壤各截面pH值均在2.2～2.5之间波动;土壤Cd的电动脱除率随电压梯度增大而增大,随电极间距增大而减小,脱除率最大可达47%;单位电动脱除率的能耗均与电压梯度和电极间距的大小呈正相关。试验结果说明以EKG为电极材料进行电动脱水,能有效地控制土壤各截面pH值,促进土壤孔隙水中可移动态Cd的高效脱除。
To investigate the rate of removing heavy metal Cd from paddy field soil with electric dehydration based on Electrokinetic geotextile(EKG), a leaching-electric dehydration laboratory simulation experiment was conducted. The variations of pH value of soil and the removal rate of Cd were inspected under different voltage gradients(1,2,3,4,5 V/cm) and electrode spacings(20, 30, 40, 50 cm) after leaching with FeCl_3. Results show that during the electric repair, the pH value of soil fluctuated between 2.2-2.5; the electric removal rate of Cd in soil increased with the climbing of voltage gradient, while decreased with the expansion of electrode spacing, and the removal rate was up to 47%; moreover, the energy consumption per unit of electric removal rate is positively correlated with the voltage gradient and the electrode spacing. The research finding demonstrates that electrokinetic dehydration with EKG as electrode material could control the pH value of soil effectively and promote the efficient removal of movable Cd in pore water of soil.
To investigate the rate of removing heavy metal Cd from paddy field soil with electric dehydration based on Electrokinetic geotextile(EKG), a leaching-electric dehydration laboratory simulation experiment was conducted. The variations of pH value of soil and the removal rate of Cd were inspected under different voltage gradients(1,2,3,4,5 V/cm) and electrode spacings(20, 30, 40, 50 cm) after leaching with FeCl_3. Results show that during the electric repair, the pH value of soil fluctuated between 2.2-2.5; the electric removal rate of Cd in soil increased with the climbing of voltage gradient, while decreased with the expansion of electrode spacing, and the removal rate was up to 47%; moreover, the energy consumption per unit of electric removal rate is positively correlated with the voltage gradient and the electrode spacing. The research finding demonstrates that electrokinetic dehydration with EKG as electrode material could control the pH value of soil effectively and promote the efficient removal of movable Cd in pore water of soil.
引文
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[10] 董萌,赵运林,库文珍,等.蒌蒿(Artemisia selengensis L.)修复洞庭湖土壤Cd污染的强化措施研究[J].长江流域资源与环境,2013,22(7):937-944.
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[17] 胡俞晨,王钊,庄艳峰.电动土工合成材料加固软土地基实验研究[J].岩土工程学报,2005,27(5):582-586.
[18] 文灵,靳向煜,柯勤飞.不锈钢纤维水刺布用作电动土工合成材料(EKG)的研究[J].非织造布,2010,18(5):26-30.
[19] 刘培亚,李玉姣,胡鹏杰,等.复合淋洗剂土柱淋洗法修复Cd、Pb污染土壤[J].环境工程,2015,33(1):163-167.
[20] 可欣,张昀,李培军,等.利用酒石酸土柱淋洗法修复重金属污染土壤[J].深圳大学学报(理工版),2009,26(3):240-245.
[21] KIM W S,PARK G Y,KIM D H,et al.In situ Field Scale Electrokinetic Remediation of Multi-metals Contaminated Paddy Soil:Influence of Electrode Configuration[J].Electrochimica Acta,2012,86(1):89-95.
[22] WENG C H,LIN Y T,LIN T Y,et al.Enhancement of Electrokinetic Remediation of Hyper-Cr(VI) Contaminated Clay by Zero-valent Iron[J].Journal of Hazardous Materials,2007,149(2):292.
[23] 冯源.城市污水污泥电动脱水机理试验研究及多场耦合作用理论分析[D].杭州:浙江大学,2012.
[24] 周碧青,侯凤娟,林君锋.不同电压降条件下污泥中主要重金属的动电去除效果[J].福建农林大学学报(自然科学版),2007,36(4):411-416.
[2] 纪雄辉,梁永超,鲁艳红,等.污染稻田水分管理对水稻吸收积累镉的影响及其作用机理[J].生态学报,2007,27(9):3930-3939.
[3] REN L,WU Wen-cheng,CHEN X,et al.Different Effects of CaCO3 and Ca(OH)2 on Heavy Metals Remediation in Contaminated Farmland Soil[J].Environmental Science & Technology,2016,39(5):22-27.
[4] 黄川,李柳,黄珊,等.重金属污染土壤的草酸和EDTA混合淋洗研究[J].环境工程学报,2014,8(8):3480-3486.
[5] 陈楠,谢湉,周歆,等.原位化学淋洗技术对湖南省重金属复合污染稻田土壤处理效果研究[J].安徽农业科学,2015,43(28):247-249,274.
[6] 温东东,付融冰,张卫,等.不锈钢电极对重金属污染土壤的强化电动脱水及电极腐蚀结晶现象与机制[J].环境科学,2017,38(3):1209-1217.
[7] ZHOU D M,CANG L,DENG C F.Electrokinetic Processes of Chromium in Yellow Brown Soil as Affected by Hydrogen Peroxide[J].Acta Pedologica Sinica,2005,42(1):59-63.
[8] 付融冰,刘芳,马晋,等.可渗透反应复合电极法对铬(Ⅵ)污染土壤的电动脱水[J].环境科学,2012,33(1):280-285.
[9] 韩少华.几种植物对Hg、Cd污染稻田土壤修复效果的比较研究[D].上海:东华大学,2012.
[10] 董萌,赵运林,库文珍,等.蒌蒿(Artemisia selengensis L.)修复洞庭湖土壤Cd污染的强化措施研究[J].长江流域资源与环境,2013,22(7):937-944.
[11] XIAO W,WANG H,LI T,et al.Bioremediation of Cd and Carbendazim Co-contaminated Soil by Cd-hyperaccumulator Sedum Alfredii Associated with Carbendazim-degrading Bacterial Strains[J].Environmental Science & Pollution Research,2013,20(1):380.
[12] YANG J,LIU J,WU C,et al.Bioremediation of Agricultural Solid Waste Leachates with Diverse Species of Cu (II) and Cd (II) by Periphyton[J].Bioresource Technology,2016,221:214.
[13] 罗希,林莉,李青云,等.镉污染稻田土壤土柱淋洗修复研究[J].长江科学院院报,2017,34(6):24-28,34.
[14] YEUNG A T,GU Y Y.A Review on Techniques to Enhance Electrochemical Remediation of Contaminated Soils[J].Journal of Hazardous Materials,2011,195(52):11.
[15] 胡艳平,林莉,李青云,等.不同pH调控方法对电助淋洗去除稻田土壤Cd的影响[J].长江科学院院报,2017,34(9):19-23
[16] 蔡宗平,王文祥,李伟善.电极材料对电动脱水尾矿周边铅污染土壤的影响研究[J].环境科学与管理,2016,41(5):108-111.
[17] 胡俞晨,王钊,庄艳峰.电动土工合成材料加固软土地基实验研究[J].岩土工程学报,2005,27(5):582-586.
[18] 文灵,靳向煜,柯勤飞.不锈钢纤维水刺布用作电动土工合成材料(EKG)的研究[J].非织造布,2010,18(5):26-30.
[19] 刘培亚,李玉姣,胡鹏杰,等.复合淋洗剂土柱淋洗法修复Cd、Pb污染土壤[J].环境工程,2015,33(1):163-167.
[20] 可欣,张昀,李培军,等.利用酒石酸土柱淋洗法修复重金属污染土壤[J].深圳大学学报(理工版),2009,26(3):240-245.
[21] KIM W S,PARK G Y,KIM D H,et al.In situ Field Scale Electrokinetic Remediation of Multi-metals Contaminated Paddy Soil:Influence of Electrode Configuration[J].Electrochimica Acta,2012,86(1):89-95.
[22] WENG C H,LIN Y T,LIN T Y,et al.Enhancement of Electrokinetic Remediation of Hyper-Cr(VI) Contaminated Clay by Zero-valent Iron[J].Journal of Hazardous Materials,2007,149(2):292.
[23] 冯源.城市污水污泥电动脱水机理试验研究及多场耦合作用理论分析[D].杭州:浙江大学,2012.
[24] 周碧青,侯凤娟,林君锋.不同电压降条件下污泥中主要重金属的动电去除效果[J].福建农林大学学报(自然科学版),2007,36(4):411-416.