PCE FILTRATION at University Of The Western Cape | Flashcards & Summaries

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Lernmaterialien für PCE FILTRATION an der University of the Western Cape

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TESTE DEIN WISSEN
What is a slurry ? 
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A slurry is a sample that is placed through the filter medium to allow filtration to take place. 
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Filter cake 
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TESTE DEIN WISSEN
The solid particles remaining/ accumulated in the filter medium after a sample have been passed through the filter medium 
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Filter medium 
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The medium used to allow filtration to take place but allowing certain substances to pass through and retaining others 
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Filtrate 
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TESTE DEIN WISSEN
The part of the sample that passes through the filter medium 
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TESTE DEIN WISSEN
Filtration rate 
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TESTE DEIN WISSEN
The amount of filtrate that passes through the filter medium and accumulates in the beaker over time 
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TESTE DEIN WISSEN
Factors that affect filtration 
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TESTE DEIN WISSEN
1. The properties of the liquid part of the slurry eg density, viscosity and corrosiveness 
2. The properties of the solid part of the slurry eg the particle size, shapes, size distribution, or the rigidity of the solid. 
3. The proportion of the solid in the slurry 
4. Whether the objective is to collect the solid, liquid or both.
5. Whether the solids must be washed. 
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TESTE DEIN WISSEN
Rate of filtration according to Darcy’s law 
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Driving force/resistance 

Rate of flow of liquid through the capillaries of the filter medium and the filter cake 
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TESTE DEIN WISSEN
The factors affecting rate of filtration (equation) 
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TESTE DEIN WISSEN
 
dV/dt = KA🔺P/ul
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TESTE DEIN WISSEN
dV/dt = KA🔺P/ul meaning 
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TESTE DEIN WISSEN
V- volume of the filtrate 
t- the time of filtration 
k- constant of the filter medium and the filter cake 
A- area of the filter medium
🔺P - pressure drop across the filter medium and the filter cake 
u - viscosity of the filtrate 
l - thickness of the cake 
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TESTE DEIN WISSEN
The rate of filtration is directly proportional to ? 
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TESTE DEIN WISSEN
K - the Constant for the filter medium and filter cake 
A - the area of the medium 
P - the pressure drop across the filter medium and filter cake 
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TESTE DEIN WISSEN
how does the area of the filter medium affect the rate of filtration 
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TESTE DEIN WISSEN
The area of the filter medium is directly proportional to the rate of filtration. This means that if we increase the area of the filter medium (eg by using a larger filter medium), then the flow and amount of the liquid part of the slurry through the filter medium will increase and thus increasing the rate of filtration. 
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TESTE DEIN WISSEN
Filtration definition 
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TESTE DEIN WISSEN
Can be defined as the separation of a solid from a fluid by means of a porous medium that retains the solid but allows the liquid to pass through. 
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Q:
What is a slurry ? 
A:
A slurry is a sample that is placed through the filter medium to allow filtration to take place. 
Q:
Filter cake 
A:
The solid particles remaining/ accumulated in the filter medium after a sample have been passed through the filter medium 
Q:
Filter medium 
A:
The medium used to allow filtration to take place but allowing certain substances to pass through and retaining others 
Q:
Filtrate 
A:
The part of the sample that passes through the filter medium 
Q:
Filtration rate 
A:
The amount of filtrate that passes through the filter medium and accumulates in the beaker over time 
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Q:
Factors that affect filtration 
A:
1. The properties of the liquid part of the slurry eg density, viscosity and corrosiveness 
2. The properties of the solid part of the slurry eg the particle size, shapes, size distribution, or the rigidity of the solid. 
3. The proportion of the solid in the slurry 
4. Whether the objective is to collect the solid, liquid or both.
5. Whether the solids must be washed. 
Q:
Rate of filtration according to Darcy’s law 
A:
Driving force/resistance 

Rate of flow of liquid through the capillaries of the filter medium and the filter cake 
Q:
The factors affecting rate of filtration (equation) 
A:
 
dV/dt = KA🔺P/ul
Q:
dV/dt = KA🔺P/ul meaning 
A:
V- volume of the filtrate 
t- the time of filtration 
k- constant of the filter medium and the filter cake 
A- area of the filter medium
🔺P - pressure drop across the filter medium and the filter cake 
u - viscosity of the filtrate 
l - thickness of the cake 
Q:
The rate of filtration is directly proportional to ? 
A:
K - the Constant for the filter medium and filter cake 
A - the area of the medium 
P - the pressure drop across the filter medium and filter cake 
Q:
how does the area of the filter medium affect the rate of filtration 
A:
The area of the filter medium is directly proportional to the rate of filtration. This means that if we increase the area of the filter medium (eg by using a larger filter medium), then the flow and amount of the liquid part of the slurry through the filter medium will increase and thus increasing the rate of filtration. 
Q:
Filtration definition 
A:
Can be defined as the separation of a solid from a fluid by means of a porous medium that retains the solid but allows the liquid to pass through. 
PCE FILTRATION

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