Removing Solids from the Base Product Water Flashcards
What is the main purpose of pre-treatment in the municipality for water supplied to breweries?
To remove most solid material and ensure water is suitable for brewing
This includes the removal of large solid objects, organic contaminants, algae, and some micro-organisms.
What filtration steps are involved in the municipality’s pre-treatment process?
Mechanical filtration steps such as screening and sand filtration
These steps help eliminate large solids and some contaminants.
What type of filter is typically used by breweries to remove remaining suspended solids?
Cartridge filter
Cartridge filters consist of polymer fibers wound in a spiral to trap solid particles.
Fill in the blank: The principle of filtration involves creating a medium that allows _______ to pass through while trapping solids.
[water molecules]
What happens to the filter as solids accumulate over time?
The pressure increases between the filter’s inlet and outlet points
This indicates that the filter should be replaced or cleaned.
What negative effects can iron and manganese have on beer quality?
They can cause flavour and colloidal instability, create metallic off-flavours, and affect yeast
Higher levels can also lead to corrosion in brewing equipment.
What are the recommended methods for removing iron from water?
Injecting air or ozone, using phosphoric acid, or allowing iron to settle
These methods convert iron to insoluble forms that can be filtered out.
How is manganese effectively removed from water?
Using greensand filtration or ion-exchange systems
Greensand contains glauconite, which oxidizes manganese.
True or False: Manganese oxidizes readily and can be removed easily.
False
Manganese requires a stronger oxidizing agent for effective removal.
What is the impact of high alkalinity in brewing water?
It is not suitable for brewing; bicarbonate levels need to be reduced.
What is the process of decarbonation by heating?
Heating converts bicarbonate to calcium carbonate and releases carbon dioxide
This can lead to scale formation in kettles.
What chemical reaction occurs during decarbonation by treatment with lime?
Ca(HCO3)2 + Ca(OH)2 → 2CaCO3 + 2H2O
This reaction precipitates calcium carbonate.
Fill in the blank: The addition of inorganic or organic acid releases _______ and forms calcium.
[carbon dioxide]
What modern treatment options are available for water treatment in breweries?
Ion exchange and membrane filtration
These methods allow for multiple treatments beyond just removing carbonates.
