16 Questions
What is the objective of Experiment 8 in the Unit Operation Lab?
To observe the filtration behavior of a filter press
What type of equipment is the Amston filter press used in this laboratory?
Plate and frame filtration equipment
How does the filter press achieve high solid content sludge cakes?
By using mechanically applied pressure
What are filter presses designed to de-water?
Chemically conditioned sludge
In operation, what compresses the plate pack in the filter press?
Hydraulic closing device
What is the main function of the filter plates in a filter press?
To hold a filter cloth and retain the solid content
In a filter press, what is the purpose of the compressed air introduced to inflate the membrane?
To speed up the filtration process
What material are the filter plates and filter cloths made of?
Polypropylene
What equation describes the flow of filtrate through the packed bed of cake in the filtration process?
$− ∆𝑃 𝑎µ = 2 𝐿 𝐷$
What does the constant 'a' represent in the filtration equation for constant-pressure filtration?
Constant related to flow characteristics
What does the term 'V' represent in the differential equation for constant pressure, constant 'a', and incompressible cake?
Total volume of filtrate collected at time 't'
What is the purpose of installing the filter press under shade to prevent direct sunlight?
To protect the filter plates and filter cloths from UV light
What is the effect of introducing compressed air to inflate the membrane in a filter press?
Speeds up the filtration process
What does the term 'L' represent in the equation describing the flow of filtrate through the packed bed of cake?
$L$
What does the term 'µ' represent in the filtration equation for constant-pressure filtration?
$µ$
In the basic equation for filtration rate in batch process, what does 'K' represent?
$K$ represents a constant related to flow characteristics
Study Notes
Experiment 8 in the Unit Operation Lab
- The objective of Experiment 8 is to demonstrate the operation of a filter press.
Amston Filter Press
- The Amston filter press is used in this laboratory for solid-liquid separation.
- It is a type of equipment used to achieve high solid content sludge cakes.
Operating Principles of Filter Press
- Filter presses are designed to de-water a wide range of materials, including chemicals, wastewater, and industrial processes.
- The plate pack in the filter press is compressed by a hydraulic system during operation.
- The main function of the filter plates is to provide a surface for the formation of a filter cake.
- The compressed air introduced to inflate the membrane helps to squeeze out more water from the filter cake.
- Filter plates and filter cloths are typically made of stainless steel or polypropylene.
Filtration Equation
- The flow of filtrate through the packed bed of cake in the filtration process is described by the equation:
- The constant 'a' represents the resistance to flow due to the cake.
- The term 'V' represents the volume of filtrate.
- The term 'L' represents the thickness of the cake.
- The term 'µ' represents the viscosity of the filtrate.
- In the basic equation for filtration rate in batch process, 'K' represents the filtration coefficient.
Installation and Operation of Filter Press
- Installing the filter press under shade helps to prevent direct sunlight, which can affect the operation.
- Introducing compressed air to inflate the membrane helps to increase the rate of filtration and improve the filter cake's dryness.
Test your knowledge on the filtration behavior of filter press, filtration parameters, efficiency in removing water and retaining calcium carbonate, and the compressibility index for calcium carbonate.
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