4.5 Article

Effects of biochar amendment on geotechnical properties of landfill cover soil

期刊

WASTE MANAGEMENT & RESEARCH
卷 33, 期 6, 页码 524-532

出版社

SAGE PUBLICATIONS LTD
DOI: 10.1177/0734242X15580192

关键词

Biochar; hydraulic conductivity; compressibility; shear strength; biochar-amended soils; landfill cover

资金

  1. US National Science Foundation [1200799]
  2. Div Of Civil, Mechanical, & Manufact Inn
  3. Directorate For Engineering [1200799] Funding Source: National Science Foundation

向作者/读者索取更多资源

Biochar is a carbon-rich product obtained when plant-based biomass is heated in a closed container with little or no available oxygen. Biochar-amended soil has the potential to serve as a landfill cover material that can oxidise methane emissions for two reasons: biochar amendment can increase the methane retention time and also enhance the biological activity that can promote the methanotrophic oxidation of methane. Hydraulic conductivity, compressibility and shear strength are the most important geotechnical properties that are required for the design of effective and stable landfill cover systems, but no studies have been reported on these properties for biochar-amended landfill cover soils. This article presents physicochemical and geotechnical properties of a biochar, a landfill cover soil and biochar-amended soils. Specifically, the effects of amending 5%, 10% and 20% biochar (of different particle sizes as produced, size-20 and size-40) to soil on its physicochemical properties, such as moisture content, organic content, specific gravity and pH, as well as geotechnical properties, such as hydraulic conductivity, compressibility and shear strength, were determined from laboratory testing. Soil or biochar samples were prepared by mixing them with 20% deionised water based on dry weight. Samples of soil amended with 5%, 10% and 20% biochar (w/w) as-is or of different select sizes, were also prepared at 20% initial moisture content. The results show that the hydraulic conductivity of the soil increases, compressibility of the soil decreases and shear strength of the soil increases with an increase in the biochar amendment, and with a decrease in biochar particle size. Overall, the study revealed that biochar-amended soils can possess excellent geotechnical properties to serve as stable landfill cover materials.

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