Particle size cut — Conventional (cake) filtration typically separates relatively large particles of approximately what minimum size?

Introduction:
Filtration modalities are often classified by particle size: conventional filtration for larger particles, microfiltration for submicron to several micrometers, ultrafiltration for macromolecules, and so on. Knowing the approximate cut helps select the right technology for cell removal or clarification steps.

Given Data / Assumptions:

• Gravity or pressure-driven conventional filter media (e.g., depth filters, screens).
• Rigid particles forming a cake.
• Qualitative threshold understanding.

Concept / Approach:
Conventional filtration is typically applied to particles larger than roughly 10 μm, where sieving and cake mechanisms dominate. Smaller particles require microfiltration or finer depth media with controlled pore structures.

Step-by-Step Solution:
Place conventional filtration at coarser end of the spectrum.Recall that microfiltration spans approximately 0.1 to 10 μm.Therefore, a practical minimum size for classical filtration is on the order of 10 μm.

Verification / Alternative check:
Vendor cut-sheets for strainers and coarse filters typically list reliable retention above 10 μm, aligning with the rule of thumb.

Why Other Options Are Wrong:

• 5 μm overlaps microfiltration territory.
• 15–20 μm are possible but unnecessarily restrictive as a general lower bound.
• 0.5 μm is well within microfiltration.

Common Pitfalls:
Overlooking particle deformability or compressible cakes; ignoring that depth media can blur the exact cut based on load and flow conditions.

Final Answer:
dp > 10 μm