Department of Civil Engineering, National Institute of Technology Karnataka, Srinivasnagar P.O, Mangalore, Karnataka 575 025, India; Department of Civil Engineering, St. Joseph College of Engineering Vamanjoor P.O, Mangaluru Karnataka 575028, India.
Department of Civil Engineering, National Institute of Technology Karnataka, Srinivasnagar P.O, Mangalore, Karnataka 575 025, India.
J Environ Manage. 2024 Sep;367:122013. doi: 10.1016/j.jenvman.2024.122013. Epub 2024 Aug 3.
Leachate emanating from landfills contains ammonia which may cause serious health effects on living things. An effectively designed clay barrier should not allow the contaminant to infiltrate the soil and groundwater systems. The utilization of certain industrial by-products in engineered landfill barriers, not only reduces the need for conventional liner materials but also helps in sustainable waste management. This study investigated the hydraulic conductivity, unconfined compressive strength, compaction, and adsorption characteristics of lithomargic clay blended with an optimum percentage of bentonite (10%) and granulated blast furnace slag (15%) permeated with ammonia. The results revealed that increasing the content of granulated blast furnace slag decreased the maximum dry density while increasing the optimum moisture content. In comparison to lithomargic clay, the hydraulic conductivity of the amended soil liner permeated with ammonia decreased from a value of 3 × 10 m/s to 5 × 10 m/s. The unconfined compressive strength of the amended soil specimens showed an increasing trend with curing times (i.e., 0, 14, 28, and 56 days). The batch adsorption results revealed that Freundlich and Langmuir's isotherm fits the equilibrium adsorption data and the adsorption of ammonia on clay liner follows non-linear behaviour. Overall, the experimental results implied that lithomargic clay blended with 10% bentonite and 15% granulated blast furnace slag can be used as an impermeable soil reactive barrier in engineered landfills.
垃圾填埋场渗滤液中含有氨，可能对生物造成严重的健康影响。设计合理的粘土屏障不应允许污染物渗透到土壤和地下水系统中。在工程型垃圾填埋场屏障中利用某些工业副产品，不仅可以减少对传统衬垫材料的需求，还有助于可持续的废物管理。本研究调查了掺有最优百分比膨润土（10%）和粒化高炉矿渣（15%）的泥灰质粘土的水力传导率、无侧限抗压强度、压实和吸附特性，并渗透了氨。结果表明，随着粒化高炉矿渣含量的增加，最大干密度降低，最佳含水量增加。与泥灰质粘土相比，掺有氨的改良土壤衬垫的水力传导率从 3×10 m/s 降低到 5×10 m/s。改良土壤试样的无侧限抗压强度随养护时间（即 0、14、28 和 56 天）呈增加趋势。批吸附结果表明，Freundlich 和 Langmuir 等温线拟合平衡吸附数据，氨在粘土衬垫上的吸附遵循非线性行为。总体而言，实验结果表明，掺有 10%膨润土和 15%粒化高炉矿渣的泥灰质粘土可用作工程型垃圾填埋场的不透水土反应屏障。
