MgO和MFA固稳铅污染土强度与浸出毒性研究
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摘要
采用活性MgO、MFA(MgO-粉煤灰)5-5、MFA3-7这3种固化剂对Pb污染土进行固稳修复,考虑7、14、28、56d 4种龄期、5%、10%2种掺量和0.1%、0.5%、1.0%3种初始Pb污染浓度,与水泥(PC)对比研究固稳铅污染土的无侧限抗压强度和溶出毒性特征.结果表明:固稳修复污染土试样强度随龄期延长而增加;修复土强度大小排序依次为MgO、MFA5-5、MFA3-7、PC;MgO、MFA5-5、MFA3-7固化体强度分别是水泥固化体强度的4～17、2～8、1.1～4.5倍.溶出铅浓度高低排序依次为PC、MFA3-7、MFA5-5、MgO,即MgO稳定Pb2+效果最好,MFA5-5和MFA3-7次之,PC固稳铅效果相对最差.综合强度和溶出特性分析结果,MgO和MFA5-5这2种材料或具有潜在的污染土固稳工程应用前景.
Three different binders, i. e. MgO, MFA5-5 and MFA3-7, are used to solidify/stabilize Pbcontaminated soils taking into account the effects of binder amount, initial Pb concentration and curing time,and to characterize the unconfined compressive strength and leaching toxicity of Pb-contaminated soils. The test results demonstrate that the compressive strength of stabilized/solidified Pb-contaminated soils increases with curing time; and the order of strength gain for stabilized soils is MgO, MFA5-5, MFA3-7, Portland Cement(PC). The compressive strength of MgO, MFA5-5 and MFA3-7-stabilized/solidified soils is respectively 1.1-4.5 times, 2-8 times and 4-17 times higher than PC-treated soils. According to the concentration of leached Pb~(2+), the order of chosen binders for stabilizing Pb~(2+)in contaminated soils is PC, MFA3-7, MFA5-5, MgO.This is to say, MgO is the optimum binder to stabilize Pb~(2+), followed by MFA5-5 and MFA3-7; and PC is the relatively worst one.
Three different binders, i. e. MgO, MFA5-5 and MFA3-7, are used to solidify/stabilize Pbcontaminated soils taking into account the effects of binder amount, initial Pb concentration and curing time,and to characterize the unconfined compressive strength and leaching toxicity of Pb-contaminated soils. The test results demonstrate that the compressive strength of stabilized/solidified Pb-contaminated soils increases with curing time; and the order of strength gain for stabilized soils is MgO, MFA5-5, MFA3-7, Portland Cement(PC). The compressive strength of MgO, MFA5-5 and MFA3-7-stabilized/solidified soils is respectively 1.1-4.5 times, 2-8 times and 4-17 times higher than PC-treated soils. According to the concentration of leached Pb~(2+), the order of chosen binders for stabilizing Pb~(2+)in contaminated soils is PC, MFA3-7, MFA5-5, MgO.This is to say, MgO is the optimum binder to stabilize Pb~(2+), followed by MFA5-5 and MFA3-7; and PC is the relatively worst one.
引文
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[2]丁耀堃.酸雨环境下磷酸镁水泥对重金属污染土的固化机理研究[D].杭州:浙江工业大学,2015.Ding Yaokun.Research of mechanism of magnesium phosphate cement stabilized heavy metal contaminated soils under the acid rain environment[D].Hangzhou:Zhejiang University of Technology,2015.
[3]张亭亭,李江山,王平,等.磷酸镁水泥固化铅污染土的应力-应变特性研究[J].岩土力学,2016,37(s1):215-225.Zhang Tingting,Li Jiangshan,Wang Ping,et al.Experimental study of stress-strain properties of lead-contaminated soils treated by magnesium phosphate cement[J].Rock and Soil Mechanics,2016,37(s1):215-225.
[4]席永慧,熊浩.锌污染土固化处理实验研究[J].同济大学学报(自然科学版),2012,40(11):1608-1612.Xi Yonghui,Xiong Hao.Experimental study of immobilization of Zn-contaminated soils[J].Journal of Tongji University(Natural Science),2012,40(11):1608-1612.
[5]薛永杰,朱书景,侯浩波,等.石灰粉煤灰固化重金属污染土壤的试验研究[J].粉煤灰,2007,19(3):10-12.Xue Yongjie,Zhu Shujing,Hou Haobo,et al.Experimental study of quicklime-ash solidification of heavy metal contaminated soil[J].Coal Ash,2007,19(3):10-12.
[6]查甫生,王连斌,刘晶晶,等.高钙粉煤灰固化重金属污染土的工程性质试验研究[J].岩土力学,2016,37(s1):249-254.Zha Pusheng,Wang Lianbin,Liu Jingjing,et al.Engineering properties of heavy metal contaminated soil solidified/stabilized with high calcium fly ash[J].Rock and Soil Mechanics,2016,37(s1):249-254.
[7]刘玲,刘海卿,李喜林,等.熟石灰-矿渣联合修复重金属污染土强度及淋滤特性研究[J].硅酸盐通报,2016,35(7):2065-2070.Liu Ling,Liu Haiqing,Li Xilin,et al.Strength and leaching characteristic for remediation of heavy metals contaminated soil using hydrated lime-slag blend[J].Bulletin of The Chinese Ceramic Society,2016,35(7):2065-2070.
[8]魏明俐,杜延军,刘松玉,等.磷矿粉稳定铅污染土的溶出特性研究[J].岩土工程学报,2014,36(4):768-774.Wei Mingli,Du Yanjun,Liu Songyu,et al.Leaching characteristics of lead-contaminated clay stabilized by phosphate rock[J].Chinese Journal of Geotechnical Engineering,2014,36(4):768-774.
[9]魏明俐,伍浩良,杜延军,等.冻融循环下含磷材料固化锌铅污染土的强度及溶出特性研究[J].岩土力学,2015,36(s1):215-219.Wei Mingli,Wu Haoliang,Du Yanjun,et al.Experimental study of Zn and Pb contaminated soils stabilized with new phosphate-based binder under freeze-thaw cycles[J].Rock and Soil Mechanics,2015,36(s1):215-219.
[10]邸素梅.我国菱镁矿资源及市场[J].非金属矿,2001,24(1):5-6.Di Sumei.Resources and market of magnesite in China[J].Non-Metallic Mines,2001,24(1):5-6.
[11]赖胜强,林亲铁,项江欣,等.氧化镁基固化剂对铅离子的吸附作用及其影响因素[J].环境工程学报,2016,10(7):3859-3865.Lai Shengqiang,Lin Qintie,Xiang Jiangxin,et al.Adsorption of Pb2+on a magnesia-based curing agent and its influencing factors[J].Chinese Journal of Environmental Engineering,2016,10(7):3859-3865.
[12]郭如新.氢氧化镁在工业废水处理中的应用[J].工业水处理,2000,20(2):1-4.Guo Ruxin.The application of magnesium hydroxide to industrial wastewater treatment[J].Industrial Water Treatment,2000,20(2):1-4.
[13]交通部公路科学研究所.JTG E40-2007公路土工试验规程[S].北京:人民交通出版社,2007.Highway Scientific Research Institute of Ministry of Communications.JTG E40-2007 Test Methods of Soil for Highway Engineering[S].Beijing:China Communications Press,2007.
[14]Cocke D L,Mollah M Y A.The chemistry and leaching mechanisms of hazardous substances in cementitious solidification/stabilization systems[C]//Chemistry of Microstructure Solidified Waste Forms,Lewis,Ann Arbor,1993:187.
[15]Bhatty M S Y.Fixation of metallic ions in Portland cement[C]//Proceedings of 4th National Conference on Hazardous Wastes&Hazardous Materials,1987:140-145.