Difficulty: Easy
Correct Answer: Disc bowl centrifuge
Explanation:
Introduction / Context:
Separating liquid phases with small density contrasts demands high centrifugal fields and short settling distances. Dairy applications are classic examples where disc stack machines excel.
Given Data / Assumptions:
Concept / Approach:
Disc bowl (disc stack) centrifuges provide a large effective clarification area with closely spaced conical discs, shortening sedimentation paths under high g-forces. This geometry magnifies separation efficiency for small Δρ systems compared with simple basket centrifuges. Filters (sparkler) are for solids–liquid separation, not liquid–liquid separation.
Step-by-Step Solution:
Identify need: liquid–liquid separation at small density difference.Select equipment providing high g and large clarification area.Choose disc bowl centrifuge.
Verification / Alternative check:
Dairy cream separators are specifically disc stack centrifuges, confirming suitability.
Why Other Options Are Wrong:
Batch basket: less suited for fine L–L separation.Sparkler filter: solid–liquid filtration device.Hydrocyclone: requires larger Δρ and droplet sizes for effective L–L separation.
Common Pitfalls:
Confusing clarifiers for solids removal with true liquid–liquid separators.
Final Answer:
Disc bowl centrifuge
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