Environmental Geotechnics, 2nd edition

Per- and Polyfluoroalkyl Substances (PFAS) in Integrated Crop–Livestock Systems: Environmental Exposure and Human Health Risks

“…Soil washing involves the separation of contaminants from soil and sediments through the application of water, solvents or air bubbles on the contaminated soil or water [ 121 ]. Thermal treatment involves increasing the soil temperature to 500–600 °C to vaporize organic contaminants and break PFAS compounds in the gas stream at a temperature of 1200 °C [ 122 , 123 ]. Another useful technique named soil liquefaction uses foam fractionation techniques to detach PFAS from liquefied soil and water to the induced bubbles [ 124 ].…”

A numerical investigation on hydro-mechanical behaviour of a high centreline tailings dam

“…The results of consolidation tests show that the effective vertical stress function (void ratio) -saturated permeability of tailings can be well expressed by an exponential function in the form of Equation 4: 3where k vi is the permeability coefficient at each stress increment, k v0 is the initial permeability coefficient and σ΄ v is in kPa. Additionally, given the layered nature of tailings (Sarsby 2013), the anisotropy ratio (k v /k h ) is assumed to be 0.8 for sand tailings (based on the discussions of Klohn (1979); Saad & Mitri (2010a, 2010b) and 0.1 for slimes (based on the discussions and results of Vick (1990); Abadjiev (1976); Vermeulen (2001); Saad & Mitri (2010a, 2010b).…”

“…Duration of construction is an important factor in the stability of upstream tailings dams and this issue for this method of construction has been discussed in investigations such as those by Sarsby (2013) and Saad (2013), although Vick (1990) has not specified any limit for the raising rate of centreline tailings dams, and has only recom mended a certain height limit for each individual elevation raise. Figure 10 shows the contour lines of the pore water pressure in Models 3 and 4.…”

“…It has been reported that seepage pattern is influenced more by the anisotropic permeability of tailings than by the definite value of this coefficient (Sarsby 2013). For this reason, some studies, such as those of Klohn (1979), Vick (1990) and Sarsby (2013), have investigated the effect of this parameter on the position of the phreatic surface under steady seepage conditions.…”

“…It has been reported that seepage pattern is influenced more by the anisotropic permeability of tailings than by the definite value of this coefficient (Sarsby 2013). For this reason, some studies, such as those of Klohn (1979), Vick (1990) and Sarsby (2013), have investigated the effect of this parameter on the position of the phreatic surface under steady seepage conditions. However, the technical literature provides only sparse information regarding the effects of anisotropy in the permeability of slimes on the development of pore water pressure and overall performance of tailings dams during staged construction.…”