Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

VINIFICATION > FILTRATION & CLARIFICATION > Flashcards

FILTRATION & CLARIFICATION Flashcards

1
Q

What is the definition of filtration?

A

Retaining the solid particles, suspended in a liquid, by passage through a porous wall which constitutes a filter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What type of filtration do you use for ions?

A

Reverse osmosis
Electro dialyse

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What type of filtration do you use for molecules?

A

Nano filtration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What type of filtration do you use for colloïdes?

A

Ultra filtration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What kind of filtration do you use for bacteria?

A

Micro filtration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What kind of filtration do you use for yeast?

A

General filtration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What kind of filtration do you use for regular size (?) particles

A

Screening

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the difference between ‘front’ and ‘tangential’ sieving?

A

Front: Vertical flow of liquid towards the membrane
Tangential: Cross-flow of liquid parallel of the membrane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Which kind of ‘flow’ has depth filtration? (front/tangential)

A

Only front

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is them main pro of tangential filtering?

A

The membrane get less clogged due to the tangentially movement of the liquid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

In what (3) ways can there be interception in the membrane during depth filtration?

A

Interception
Sedimentation
Adsorbtion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is specific about a volumetric pomp?

A

It has a ‘by-pass’ valve that regulates the flow and pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the definition of porosity (%)?

A

The empty volume of a filter compared to it’s total volume

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the definition of a pore diameter

A

The diameter of the holes in the filter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the definition of permeability?

A

The more or less easy it is for a liquid to pass the filter. High permeability allows easy flow through. Low permeability less easy flow, earlier clogged.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Name 3 examples of types of rough filtration

A

Alluvial filter (earth)
Hollow frame press filter
Press filter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Name two examples of fine filtration

A

Membrane filter
Lenticullary filter
(= the ones prior to botteling)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Name two types of must/lees filteration

A

Lees filter
Vacuum rotary filter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What kind of filter is earth filtration? (front/tangential)

A

Rough filtration
Front sieve (vertical flow)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What kind of filter is earth filtration? (front/tangential)

A

Rough filtration
Front sieve (vertical flow)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Which type of filter uses ‘single-celled algae shell’?

A

Earth filtration - diatomaceous earth or kieselguhr

22
Q

Do you use perlite instead of diatomaceous earth for filtration for a very cloudy must?

A

Perlite has a higher permeability
Rough filtration due to high permeability

23
Q

For what do you use a press filter?

A

For must and wine lees

24
Q

What types of methods can be used to extract must lees? (4)

A

Cold setteling
Flottation
Centrifugation
Dried matter (?)

25
Which method of extracting must lees will remove the most part of the lees? (?)
Cold settling
26
Name 4 advantages of horizontal support
Excellent cake hold Stop and restart possible Filtering to the end Cakes in pasty shapes
27
Name 4 disadvantages of horizontal support
Surface/volume divided by 2 Very high More delicate cleaning More sophisticated to handle
28
Name two types of cellulose filtration
Plate and frame filter Lenticular filter
29
What do we mean by polyfiltration?
A press filter with 2 or more filter cycles Reducing time and oxidation
30
What are the three 'levels' of filtration with plate filtration?
Degreasing (most coarse) Clarifying Sterilizing
31
What is the maximum amount of viable germs/L in dry white after filtration? And in wine with rs?
Dry white: 100 germs per L White with rs: 10 germs per L
32
What size um will remove all microorganisms and some macro molecules?
0,2um
33
Where is a membrane filter used for?
Sterile filtration. at 90C (Noelle edit = 90C is cleaning temperature, not filtration temp)
34
What kind of membranes do we have? (4)
Plan membrane Spiral membrane Hollow fibers Ceramic tubular
35
What do a spiral and plan membrane have in common?
They are both layered. Only difference is that a spiral membrane is twisted
36
What do we mean by the back flush system?
You backflush when you have a clogged filter or when you want to clean. Not every filter (like lenticular) is suitable.
37
What options do you have when your filter is clogged? (4)
Back flush renewal Rinse Cleaning in place
38
In what case do you choose for sterile filtration?
When you want complete stability For a wine with short shelf life Wine aimed for supermarkets and export
39
What could be arguments for coarse or no filtration?
Wine aimed for long ageing Tradition
40
Why is a frontal sieve filtration the best for sterile filtration
41
How does pressure relate to the density of the liquid?
The higher the density the higher the pressure
42
What do we mean by pre-coating?
The little layer of clean earth you need to prepare the filter surface with in order to protect it and make it more easy to clean
43
How many hours do we count for the gross lees?
24 hours
44
What is the micron size for sterile filtration?
0,65um officially 0,45um to be sure 0,20 sterile sterile
45
What is the consequence of waiting between filtering without cleaning
Tannin react with polysaccharides and form bigger particles causing quicker clogging
46
Which principles do you need to take into consideration with depth filtration? (3)
The flow The capacity The pressure
47
What is the principle of alluvial filtration process?
The solide particles are caught in the earth matrix. Less clogging but increasing pressure.
48
Name what is removed at the different pore sizes: 0,2-0,8um, 0,65um, 0,45um, 0,2um
0,2-0,8um = yeast 0,65um = yeast and bacteria 0,45 um = all micro-organism (seen as sterile) 0,2um all micro-organism and some macro molecules
49
What the main feature of crossflow in relation with backflush?
Constant backflush during ongoing process. Avoids clogging.
50
What is the principal of depth filtration
Interception Sedimentation Absorption Zeta Potential

VINIFICATION (13 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions