危险废物渗滤液阳离子和应力作用下膨润土化学相容性研究

杨延梅; 梁柱; 姚光远; 刘玉强; 徐亚; 刘景财; 钱璨

doi:10.12153/j.issn.1674-991X.20230842

危险废物渗滤液阳离子和应力作用下膨润土化学相容性研究

doi: 10.12153/j.issn.1674-991X.20230842

杨延梅^1,,
梁柱^{1, 2, 3},
姚光远^{2, 3, ,},
刘玉强^{2, 3},
徐亚^{2, 3},
刘景财^{2, 3},
钱璨^{2, 3}

1.
重庆交通大学河海学院
2.
环境基准与风险评估国家重点实验室，中国环境科学研究院
3.
生态环境部危险废物鉴别与风险控制重点实验室，中国环境科学研究院

基金项目: 中央级公益性科研院所基本科研业务费专项(2022YSKY-31)

详细信息

作者简介:
杨延梅（1975—），女，教授，博士，主要从事固体废物处理与处置研究，cqyymei@163.com

通讯作者:
姚光远(1990—)，男，副研究员，博士，主要从事固体废物的资源化利用、填埋处置及环境风险控制研究，yaogy@craes.org.cn

中图分类号: X705
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- 文章访问数: 47
- HTML全文浏览量: 22
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- 被引次数: 0
出版历程
- 收稿日期: 2023-11-22
- 录用日期: 2024-03-01
- 修回日期: 2024-02-17

Study on chemical compatibility of bentonite under the action of cation and stress of hazardous waste leachate

YANG Yanmei^1
,,
LIANG Zhu^{1, 2, 3},
YAO Guangyuan^{2, 3
, ,},
LIU Yuqiang^{2, 3},
XU Ya^{2, 3},
LIU Jingcai^{2, 3},
QIAN Can^{2, 3}

1.
School of River and Ocean Engineering, Chongqing Jiaotong University
2.
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences
3.
Ministry of Ecology and Environment Key Laboratory of Hazardous Waste Identification and Risk Control, Chinese Research Academy of Environmental Sciences

摘要

摘要:
膨润土因其优异的防渗性能被用于危险废物填埋场防渗屏障的构筑，但其防渗性能通常会受到渗滤液和应力的影响。通过渗滤液采样分析设置不同浓度阳离子溶液，系统探究实际渗滤液组分对膨润土防渗性能的影响规律；选用Ca²⁺作为特征阳离子研究不同应力条件下膨润土渗透系数变化规律；同时结合Zeta电位和DLVO理论计算，阐明渗滤液组分和应力作用对膨润土化学相容性影响规律。结果表明，渗滤液中Al³⁺、Fe³⁺、Zn²⁺、Ni²⁺、Cu²⁺、Fe²⁺、Mn²⁺浓度为0~0.20 mmol/L时，对膨润土膨胀特性和渗透特性影响较小。Mg²⁺、Ca²⁺、K⁺、Na⁺浓度为0.20~50 mmol/L时，Ca²⁺对膨润土膨胀特性和渗透特性影响较大，Ca²⁺浓度由1 mmol/L上升到50 mmol/L时，渗透系数由1.15×10⁻⁷ cm/s急速上升到6.34×10⁻⁶ cm/s。Ca²⁺浓度和应力通常通过影响水化后膨润土孔隙比进而影响其渗透特性，相同Ca²⁺浓度条件下，渗透系数随应力增加而逐渐降低。Zeta电位和DLVO理论分析表明，Ca²⁺浓度增大会导致膨润土表面负电势减弱，引起膨润土双电层厚度减小，使膨润土中蒙脱石的层间距变小，导致膨润土膨胀特性和渗透特性降低。因此，填埋过程中应优化危险废物固化稳定化工艺，从源头减少渗滤液中Ca²⁺浓度；同时还应研发新型膨润土复合材料，提高膨润土在Ca²⁺等高浓度盐溶液中的防渗性能，防控危险废物填埋场渗漏风险。
- 膨润土 /
- 危险废物渗滤液 /
- 化学相容性 /
- 渗透特性 /
- 应力
Abstract:
Bentonite is widely used for the construction of anti-seepage barriers in hazardous waste landfills due to its excellent anti-seepage performance, but its impermeability is usually affected by leachate and stress. Different concentrations of cationic solutions were set up by leachate sampling and analysis to investigate the influence law of actual leachate components on the anti-seepage performance of bentonite. Ca²⁺ was chosen as the characteristic cation, and the variation rule of the bentonite permeability coefficient under different stress conditions was studied. Meanwhile, the influence law of chemical compatibility of bentonite was elucidated under the action of leachate composition and stress combined with Zeta potential and DLVO theoretical calculation. The results show that the concentration of Al³⁺, Fe³⁺, Zn²⁺, Ni²⁺, Cu²⁺, Fe²⁺, Mn²⁺ in the leachate is in the range of 0-0.20 mmol/L, which has less influence on the expansion and permeability characteristics of bentonite. The concentration of Mg²⁺, Ca²⁺, K⁺, Na⁺ is in the range of 0.20-50 mmol/L, and Ca²⁺ has more influence on the expansion capacity and permeability characteristics of bentonite. When the concentration increases from 1 mmol/L to 50 mmol/L, the permeability coefficient rapidly increases from 1.15×10⁻⁷ cm/s to 6.34×10⁻⁶ cm/s. Ca²⁺ concentration and stress usually affect the permeability characteristics of hydrated bentonite by affecting its porosity, and the permeability coefficient gradually decreases with increasing pressure under the same Ca²⁺ concentration conditions. Zeta potential and DLVO theoretical analysis indicate that the increase in Ca²⁺ concentration leads to a decrease in the negative potential on the surface of bentonite and thickness of the double layer of bentonite, which decreases the interlayer spacing of montmorillonite in bentonite, and then depress the swelling and permeability characteristics of bentonite. Therefore, the solidification and stabilization process of hazardous waste during the landfill process should be optimized, to reduce Ca²⁺ content in the leachate at the source. Meanwhile, new bentonite composite materials should be developed to improve the impermeability of bentonite in Ca²⁺ as well as other salt solutions to prevent and control the risk of leakage of hazardous waste landfills.
- bentonite /
- hazardous waste leachate /
- chemical compatibility /
- permeability /
- stress

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图 1 低浓度阳离子（Al³⁺、Fe³⁺、Zn²⁺、Ni²⁺、Cu²⁺、Fe²⁺、Mn²⁺）对膨润土膨胀性能影响

Figure 1. Effect of low concentrations of cations (Al³⁺, Fe³⁺, Zn²⁺, Ni²⁺, Cu²⁺, Fe²⁺, Mn²⁺) on the swelling properties of bentonite

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图 2 高浓度阳离子（Mg²⁺、Ca²⁺、K⁺、Na⁺）对膨润土膨胀性能影响

Figure 2. Effect of high concentrations of cations (Mg²⁺, Ca²⁺, K⁺, Na⁺) on the swelling properties of bentonite

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图 3 不同阳离子浓度下渗透系数变化

Figure 3. Changes in permeability coefficients for different cation concentrations

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图 4 Ca²⁺浓度为1 mmol/L时P₀t/V-V关系曲线

Figure 4. P₀t/V-V relationship curve for Ca²⁺ concentration of 1 mmol/L

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图 5 不同Ca²⁺浓度下应力与φ关系曲线

Figure 5. Experimental pressure versus φ curve for different Ca²⁺ concentrations

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图 6 不同Ca²⁺浓度下应力与平均孔隙比的关系曲线

Figure 6. Pressure versus average pore ratio relationship curve at different Ca²⁺ concentrations

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图 7 不同Ca²⁺浓度下平均孔隙比与渗透系数的关系曲线

Figure 7. Relationship between average pore ratio and permeability coefficient at different Ca²⁺ concentrations

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图 8 不同Ca²⁺浓度下渗透系数的变化

Figure 8. Variation of permeability coefficient at different Ca²⁺concentrations

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图 9 不同浓度阳离子中膨润土胶体间势能作用

注：图（c）离子浓度均为0.05 mmol/L，图（d）离子浓度均为0.20 mmol/L。

Figure 9. Diagram of intercolloidal potential energy action of bentonite in different concentrations of cations

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表 1 膨润土物理化学指标

Table 1. Physical and chemical indexes of bentonite

蒙脱石含量/%	胶质价/ （mL/g）	液限/%	塑限/%	比表面积/ （m²/g）	膨胀容/ （mL/g）
75	6.68	269.4	34	252	19.8

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表 2 不同阳离子溶液作用下膨润土Zeta电位

Table 2. Bentonite zeta potential under the action of different cationic solutions mV　

离子浓度/（mmol/L）	Na⁺	K⁺	Ca²⁺	Ni²⁺	Cu²⁺	Zn²⁺	Fe²⁺	Fe³⁺	Al³⁺
0.05	—	—	—	−33.37	−33.87	−34.60	−32.13	−37.83	−34.77
0.20	—	—	—	−32.90	−24.23	−34.60	−32.53	−32.43	−30.30
5	−36.63	—	—	—	—	—	—	—	—
10	—	−36.33	−10.95	—	—	—	—	—	—
50	−42.53	−38.20	−8.83	—	—	—	—	—	—
注：—表示未检测。

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参考文献(32)

[1]	生态环境部. 2020年中国生态环境统计年报[A/OL]. [2023-12-06]. https://www.mee.gov.cn/hjzl/sthjzk/sthjtjnb/202202/W020220218339925977248.pdf.
[2]	陆晨遨, 曹郁, 夏宇欣, 等. 呼伦贝尔市城郊河岸带土壤与河流沉积物重金属污染现状分析[J]. 地球环境学报,2023,14(1):110-120. LU C A, CAO Y, XIA Y X, et al. Analysis on the current heavy metal pollution situation in the riparian zone and river in the suburbs and urbans of Hulun Buir[J]. Journal of Earth Environment,2023,14(1):110-120.
[3]	吕玉娟, 王秋月, 孙雪梅, 等. 浙江省某尾矿库周边农田土壤重金属污染特征及来源解析[J]. 环境工程技术学报,2023,13(4):1464-1475. doi: 10.12153/j.issn.1674-991X.20221193 LÜ Y J, WANG Q Y, SUN X M, et al. Pollution characteristics and source identification of heavy metals in farmland soils around a tailing pond in Zhejiang Province[J]. Journal of Environmental Engineering Technology,2023,13(4):1464-1475. doi: 10.12153/j.issn.1674-991X.20221193
[4]	程睿. 铜矿弃渣场下游农田土壤重金属污染特征及健康风险评价[J]. 环境工程技术学报,2020,10(2):280-287. CHENG R. Pollution characteristics and health risk assessment of heavy metals in farmland soil downstream of a copper mine slag dumps[J]. Journal of Environmental Engineering Technology,2020,10(2):280-287.
[5]	朱铭珠, 姚光远, 刘玉强, 等. 填埋场HDPE膜漏洞靶向电动修补技术影响因素[J]. 中国环境科学,2022,42(10):4696-4703. ZHU M Z, YAO G Y, LIU Y Q, et al. The influencing factors of targeted electric repair technology for HDPE membrane leakage in landfill[J]. China Environmental Science,2022,42(10):4696-4703.
[6]	向锐. 危险废物填埋场导排层淤堵机理研究[D]. 武汉: 武汉科技大学, 2019.
[7]	SHACKELFORD C D, SAMPLE-LORD K M. Hydraulic conductivity and compatibility of bentonite for hydraulic containment barriers[C]//From soil behavior fundamentals to innovations in geotechnical engineering. Atlanta: American Society of Civil Engineers, 2014.
[8]	于泽溪, 李育超, 陈冠年. 钠质膨润土渗透性与膨胀性及可塑性的相关性[J]. 哈尔滨工业大学学报,2020,52(11):97-106. YU Z X, LI Y C, CHEN G N. Correlation between permeability, swelling, and plasticity of sodium bentonite[J]. Journal of Harbin Institute of Technology,2020,52(11):97-106.
[9]	高子瑞, 陈涛, 徐永福. 盐溶液对膨润土膨胀性的影响[J]. 岩土力学,2018,39(1):249-253. GAO Z R, CHEN T, XU Y F. Effect of salt solution on swelling characteristics of bentonite[J]. Rock and Soil Mechanics,2018,39(1):249-253.
[10]	XIANG G S, YE W M, XU Y F, et al. Swelling deformation of Na-bentonite in solutions containing different cations[J]. Engineering Geology,2020,277:105757. doi: 10.1016/j.enggeo.2020.105757
[11]	陈晓雄. 聚合物改性膨润土基阻隔材料的污染物迁移特性研究[D]. 武汉: 华中科技大学, 2021.
[12]	张弦, 叶春松, 贾旭翔, 等. 基于DLVO理论计算球形氢氧化镁胶体的Hamaker常数[J]. 热力发电,2018,47(12):47-52. ZHANG X, YE C S, JIA X X, et al. Calculation of Hamaker constant of spherical magnesium hydroxide colloid based on DLVO theory[J]. Thermal Power Generation,2018,47(12):47-52.
[13]	XU Z, SUN Y L, NIU Z W, et al. Kinetic determination of sedimentation for GMZ bentonite colloids in aqueous solution: effect of pH, temperature and electrolyte concentration[J]. Applied Clay Science,2020,184:105393. doi: 10.1016/j.clay.2019.105393
[14]	郭争争, 管俊芳, 陈菲, 等. 重金属对膨润土膨胀性的影响[J]. 矿产综合利用,2020(1):203-208. GUO Z Z, GUAN J F, CHEN F, et al. Effect of heavy metal ions on swelling property of bentonite[J]. Multipurpose Utilization of Mineral Resources,2020(1):203-208.
[15]	高仁波, 赵云良, 陈立才, 等. 蒙脱石层电荷密度对其二维纳米片剥离的影响[J]. 硅酸盐学报,2021,49(7):1420-1428. GAO R B, ZHAO Y L, CHEN L C, et al. Effect of layer charge density on the exfoliation of montmorillonite to prepare two-dimensional nanosheets[J]. Journal of the Chinese Ceramic Society,2021,49(7):1420-1428.
[16]	李勤, 陆现彩, 张立虎, 等. 蒙脱石层间阳离子交换的分子模拟[J]. 南京大学学报(自然科学),2019,55(6):879-887. LI Q, LU X C, ZHANG L H, et al. Molecular simulation of interlayer cation exchange of montmorillonite[J]. Journal of Nanjing University (Natural Science),2019,55(6):879-887.
[17]	孙娇. 危险废物填埋场的稳定性研究[D]. 重庆: 重庆交通大学, 2012.
[18]	任俊蓉, 祐文彬, 彭瑞东, 等. 降雨对危险废弃物填埋场稳定性影响的数值模拟研究[C]//北京力学会第20届学术年会论文集. 北京: 北京力学会, 2014: 520-521.
[19]	王宝, 董兴玲. 利用膨润土的膨胀和稠度特性对GCL渗透系数进行预测的试验研究[J]. 土木建筑与环境工程, 2015, 37(5): 66-71. WANG B, DONG X L. Relationship between hydraulic conductivity and swell index and liquid limits of GCL[J]. Journal of Civil, Architectural & Environmental Engineering, 2015, 37(5): 66-71.
[20]	GASTELO J, LI D, TIAN K, et al. Hydraulic conductivity of GCL overlap permeated with saline solutions[J]. Waste Management,2023,157:348-356. doi: 10.1016/j.wasman.2022.12.028
[21]	沈胜强, 杜延军, 张润, 等. 基于改进滤失试验的CaCl₂溶液作用下膨润土滤饼渗透系数[J]. 东南大学学报(自然科学版),2016,46(增刊1):179-183. SHEN S Q, DU Y J, ZHANG R, et al. Hydraulic conductivity of bentonite filter cakes in concentrated calcium chloride solutions based on modified fluid loss test[J]. Journal of Southeast University (Natural Science Edition),2016,46(Suppl 1):179-183.
[22]	TIAN H H, WEI C F, YAN R T. Thermal and saline effect on mineral-water interactions in compacted clays: a NMR-based study[J]. Applied Clay Science,2019,170:106-113. doi: 10.1016/j.clay.2019.01.015
[23]	范日东. 重金属作用下土-膨润土竖向隔离屏障化学相容性和防渗截污性能研究[D]. 南京: 东南大学, 2017.
[24]	焦怡畅, 赵青, 吴丰昌. 表面活性剂增强黑磷纳米片复合溶液体系分散稳定性研究[J/OL]. 环境科学研究: 1-12. [2024-01-08]. https: //doi. org/10.13198/j. issn. 1001-6929.2023. 11.23. JIAO Y C, ZHAO Q, WU F C. Study on dispersion stability of black phosphorus nanosheet composite solution enhanced by surfactant[J/OL]. Research of Environmental Sciences: 1-12. [2024-01-08].https://doi.org/10.13198/j.issn.1001-6929.2023.11.23.
[25]	万江, 王晓焕, 刘志勇. 膨润土-水悬浮体系的zeta电位研究[J]. 非金属矿,2017,40(4):23-25. WAN J, WANG X H, LIU Z Y. Study on zeta potential of bentonite-water suspension system[J]. Non-Metallic Mines,2017,40(4):23-25.
[26]	杨宗义, 刘文礼, 焦小淼, 等. 蒙脱石分散体系中用Zeta电位修正静电作用能的计算[J]. 煤炭学报,2017,42(6):1572-1578. YANG Z Y, LIU W L, JIAO X M, et al. Calculation of electrostatic interaction energy by using Zeta potential in montmorillonite dispersion system[J]. Journal of China Coal Society,2017,42(6):1572-1578.
[27]	刘晓光, 李国军, 仝建峰, 等. 氧化锆水系料浆稳定性研究[J]. 材料工程,2003,31(9):30-32. doi: 10.3969/j.issn.1001-4381.2003.09.008 LIU X G, LI G J, TONG J F, et al. Study on stability of zirconia aqueous slurries[J]. Journal of Materials Engineering,2003,31(9):30-32. doi: 10.3969/j.issn.1001-4381.2003.09.008
[28]	严昊炜, 崔家瑞, 张泽朋. 层间阳离子对蒙脱石凝胶性能的影响[J]. 中国粉体技术,2019,25(3):48-54. YAN H W, CUI J R, ZHANG Z P. Effects of interlayer cations on its gel performances of montmorillonite[J]. China Powder Science and Technology,2019,25(3):48-54.
[29]	许四法, 魏伟伟, 刘继状, 等. 溶液特征对石屑掺膨润土混合土的渗透特性影响[J]. 岩土工程学报,2019,41(增刊2):41-44. XU S F, WEI W W, LIU J Z, et al. Influences of solution characteristics on permeability of stone-bentonite mixtures[J]. Chinese Journal of Geotechnical Engineering,2019,41(Suppl 2):41-44.
[30]	KEMAL D O Y M U S. The effect of ionic electrolytes and pH on the Zeta potential of fine coal particles[J]. Turkish Journal of Chemistry,2007,31(6):589-597.
[31]	杜伟, 李航, 李睿, 等. 不同浓度Na⁺在紫色土颗粒表面电场作用下的吸附动力学研究[J]. 西南大学学报(自然科学版),2015,37(7):7-15. DU W, LI H, LI R, et al. The adsorption dynamics of different concentrations of Na⁺ on purple soil particles under the effect of surface electric field[J]. Journal of Southwest University (Natural Science Edition),2015,37(7):7-15.
[32]	王智巧, 马杰, 陈雅丽, 等. 不同环境条件下水铁矿和针铁矿纳米颗粒稳定性[J]. 环境科学,2020,41(5):2292-2300. WANG Z Q, MA J, CHEN Y L, et al. Stability of ferrihydrite and goethite nanoparticles under different environmental conditions[J]. Environmental Science,2020,41(5):2292-2300. □