Question:
Indirect UHT treatment can be done using which of the following methods ?
Indirect UHT treatment can be done using which of the following methods ?
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Remember this division of UHT methods:
- Direct UHT = Injection, Infusion (direct steam contact).
- Indirect UHT = Plate, Tubular, Scraped Surface (using heat exchangers).
- Indirect UHT = Plate, Tubular, Scraped Surface (using heat exchangers).
Updated On: Jul 21, 2026
- Injection
- Heat exchanger
- Infusion
- Vacreation
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Ultra-High Temperature (UHT) processing is a continuous sterilization method used to produce commercially sterile shelf-stable milk products.
UHT heating systems are broadly classified into direct and indirect heating methods.
Step 2: Detailed Explanation:
In direct UHT systems, steam is mixed directly with the product to heat it rapidly.
This is achieved using steam injection (injecting steam into milk) or steam infusion (spraying milk into a steam-filled chamber).
In contrast, indirect UHT systems prevent any direct contact between the heating medium (steam or hot water) and the milk.
Instead, heat transfer occurs across a physical barrier using a heat exchanger.
Typical indirect heat exchangers used in UHT plants include plate heat exchangers, tubular heat exchangers, and scraped surface heat exchangers.
These systems are highly energy-efficient because they allow for extensive heat recovery (up to \(90\%\)).
Vacreation is a vacuum-pasteurization system primarily used to pasteurize and deodorize cream for butter making, and is not a UHT method.
Therefore, indirect UHT treatment relies on a heat exchanger.
Step 3: Final Answer:
Indirect UHT treatment is performed using a Heat exchanger.
Ultra-High Temperature (UHT) processing is a continuous sterilization method used to produce commercially sterile shelf-stable milk products.
UHT heating systems are broadly classified into direct and indirect heating methods.
Step 2: Detailed Explanation:
In direct UHT systems, steam is mixed directly with the product to heat it rapidly.
This is achieved using steam injection (injecting steam into milk) or steam infusion (spraying milk into a steam-filled chamber).
In contrast, indirect UHT systems prevent any direct contact between the heating medium (steam or hot water) and the milk.
Instead, heat transfer occurs across a physical barrier using a heat exchanger.
Typical indirect heat exchangers used in UHT plants include plate heat exchangers, tubular heat exchangers, and scraped surface heat exchangers.
These systems are highly energy-efficient because they allow for extensive heat recovery (up to \(90\%\)).
Vacreation is a vacuum-pasteurization system primarily used to pasteurize and deodorize cream for butter making, and is not a UHT method.
Therefore, indirect UHT treatment relies on a heat exchanger.
Step 3: Final Answer:
Indirect UHT treatment is performed using a Heat exchanger.
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