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Hydraulic conductivity and removal rate of compacted clays permeated with landfill leachate

机译：渗滤液渗入压实粘土的水力传导率和去除率

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摘要

Compacted clay soils are widely used as a barrier to protect environment from leachate migration. The suitability of clay soil for liner material, depends on resistibility to increase in hydraulic conductivity and contaminant transport. In this article, the influence of compaction energy and permeated leachate properties on the hydraulic conductivity were investigated. Natural attenuation capacities of clays compacted both standard and modified compaction methods were also evaluated. With this purpose, a series of laboratory tests were conducted with soil and real leachate samples obtained from Sile-Koemuercueoda Organized Landfill Site. DI and real leachate samples were percolated through the laboratory-scale column reactors that were filled with compacted clay samples prepared according to Standard and Modified Proctor method. During percolation, the hydraulic conductivity and natural attenuation capacity of the clay liner were determined by hydraulic conductivity calculation and chemical oxygen demand (COD), suspenden solids (SS), total Kjeldahl nitrogen (TKN), total phosphorus (TP) monitoring, respectively. According to the hydraulic conductivity measurements using leachate, it is shown that hydraulic conductivity decreased in both compacted clay prepared by Standard and Modified Proctor methods, possibly associated with biological and chemical clogging mechanisms. It is thought that clogging formed due to biofilm growth and /or suspended solids accumulation between the particles of the clay soil. When the variations of the COD, SS, TKN, and TP were examined, it was observed that the removal efficiency of the clay compacted by the modified compaction method was greater than the one compacted by the standard compaction method, especially for SS.
机译：压实的粘土被广泛用作保护环境免受渗滤液迁移的屏障。粘土对于衬里材料的适合性取决于提高水力传导性和污染物输送的抵抗力。本文研究了压实能量和渗透渗滤液特性对水力传导率的影响。还评估了用标准压实法和改进压实法压实的粘土的自然衰减能力。为此，对从Sile-Koemuercueoda有组织的垃圾掩埋场获得的土壤和实际渗滤液样品进行了一系列实验室测试。去离子水和实际渗滤液样品通过实验室规模的柱式反应器渗滤，该反应器装有根据标准和改良Proctor方法制备的压实粘土样品。在渗流过程中，分别通过水力传导率计算和化学需氧量（COD），悬浮固体（SS），总凯氏氮（TKN），总磷（TP）监测来确定粘土衬里的水力传导率和自然衰减能力。根据使用浸出液的水力传导率测量结果，表明通过标准方法和改进的Proctor方法制备的压实粘土的水力传导率均下降，这可能与生物和化学堵塞机理有关。据认为，由于生物膜的生长和/或悬浮的固体在粘土颗粒之间的积聚而形成堵塞。当检查COD，SS，TKN和TP的变化时，发现用改良压实方法压实的粘土的去除效率要比用标准压实方法压实的粘土的去除效率更高，尤其是对于SS。

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  • 来源
    《Desalination and water treatment》 |2013年第33期|6148-6157|共10页
  • 作者

    Mehmet Sukru Ozcoban; Nejat Cetinkaya; Suna Ozden Celik; Guler Turkoglu Demirkol; Vildan Cansiz; Nese Tufekci;

  • 作者单位

    Civil Engineering Faculty, Civil Engineering Department, Geotechnical Division, Yildiz Technical University, Davutpasa Campus, Istanbul 34220, Turkey;

    Civil Engineering Faculty, Civil Engineering Department, Geotechnical Division, Yildiz Technical University, Davutpasa Campus, Istanbul 34220, Turkey;

    Corlu Engineering Faculty, Department of Environmental Engineering, Namik Kemal University, Corlu 59860 Tekirdag, Turkey;

    Faculty of Engineering, Department of Environmental Engineering, Istanbul University, Avalar Campus, Istanbul 34320, Turkey;

    Faculty of Engineering, Department of Environmental Engineering, Istanbul University, Avalar Campus, Istanbul 34320, Turkey;

    Faculty of Engineering, Department of Environmental Engineering, Istanbul University, Avalar Campus, Istanbul 34320, Turkey;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hydraulic conductivity; Landfill leachate; Compacted clay liner; Removal efficiency;

    机译：导水率垃圾渗滤液压实的粘土衬里;去除效率;

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