If you are considering using this soil as a filter material, what soil propertie
ID: 1710282 • Letter: I
Question
If you are considering using this soil as a filter material, what soil properties might be of interest? For what applications might infiltration rates (double ring infiltration testing) be necessary in addition to hydraulic conductivity (permeability testing)? When would one be preferred over the other?
Void ratio, e
0.55022
0.48025
0.40379
0.47919
0.31456
K (15°c) (cm/s)
0.00120
0.00106
0.00054
0.00019
0.00020
K (20°c) (cm/s)
0.00106
0.00093
0.00047
0.00017
0.00018
This is the lab discussion question.Here are the properties for the unkonwn soil. Discuss other soil properties might be of interest.
Please typing!!!
Void ratio, e
0.55022
0.48025
0.40379
0.47919
0.31456
K (15°c) (cm/s)
0.00120
0.00106
0.00054
0.00019
0.00020
K (20°c) (cm/s)
0.00106
0.00093
0.00047
0.00017
0.00018
Explanation / Answer
Solution:-
The ability of soil to provide this filtration is through one or more pbysical, chemical or biological process that remove or degrade various constituents in water as it passes through on its way to groundwater. Physical filtration is directly analogous to passing water through a screen: The soil acts as a seive and holds back particles that are too large to pass through. Unlike a simple screen however this characteristics is enhanced by the tortuous path that water takes through the soil which provides multiple opportunities to capture Constituents. Sediments and even bacteria can be removed by this mechanism.
The surfaces of soil particle often are chemically reactive and provide multiple means by which contaminants in the water can be adsorbed by soil particles and effectively be removed from the water by chemical process. Many soil clay particle have a negative charge and will attract any Constituents in the water that have a positive charge( e.g. heavy metals, salts, organic chemical and pesticides). Another mechanism is the formation of covalent bonds that helps soil retain many organic chemicals, pesticides and some inorganic Constituents.
Water infiltrates the soil during a shower of irrigation. If moistening exceeds the infiltration capacity, water ponds the ground surface. Some factors affecting the infiltration capacity at the soil surface are: Soil compaction caused by ruts and treading, washing of fine particles into surface pores, and cracks and fissures.These factors may lead to crusted soil. In addition, the vegetation and soil cultivation may affect infiltration capacity.
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