Environmental Engineering
An unsaturated subsurface is contaminated with 2000 mg/kg of gasoline. The bulk density of soil is 1.8 g/cm3, the soil porosity is 0.40 cm3/cm3 and the degree of water saturation is 32%. Soil temperature is 20°C. The air in the subsurface is relatively stagnant. Determine if the amount of oxygen available in the soil pore water and soil air is sufficient to support the complete aerobic degradation of gasoline.
Use the following assumptions for this question, make any other assumptions needed and show your calculations on a m3 of contaminated soil basis:
1. For every gram of gasoline, 3.08 g of O2 is needed for aerobic degradation.
2. Soil moisture (soil pore water) is saturated with oxygen and the saturated dissolved oxygen concentration is 9 mg/L.
3. The oxygen concentration in the pore air is the same as that in the ambient air (21% by volume).
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8. Ions are displaced from the resin binding sites by
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