Which of the following statements is NOT consistent with the introductory paragraph of Gottschalk §3.3, which summarizes the main limitations in microfiltration (MF) and proposed mitigations?

Question

BlackTom AI · Accepted Answer

Concentration polarization and particulate fouling, rather than osmotic pressure, are the dominant limitations in harvest microfiltration (MF).

1. Relevant knowledge points and concepts
- Microfiltration (MF) uses relatively large pores (typically 0.1–10 μm) to separate particulates and cells; limitations are primarily particle concentration polarization near the membrane and fouling/cake formation.  
- Mitigations include crossflow and other flow configurations, hydrodynamic methods (rotating disks, induced vortices) and mechanical/periodic cleaning (backflushing) to reduce polarization and cake buildup.  
- Osmotic pressure is a major limiting factor when dissolved solutes create a significant counter-pressure (as in reverse osmosis or nanofiltration), but not for particle-sized separations in MF.

2. Step-by-step reasoning
- Option: "Flow configurations have been proposed to mitigate concentration polarization." This matches the MF literature and Gottschalk §3.3 summary: crossflow and special module geometries are standard mitigations. So this statement is consistent.  
- Option: "Rotating disks / vortices / backflushing can reduce concentration polarization." These are explicit hydrodynamic and operational mitigations cited for reducing the near-membrane particle layer—consistent.  
- Option: "Irreversible fouling by particulates is a concern." Particle trapping and irreversible cake or pore blocking are central MF concerns—consistent.  
- Option: "Particle concentration polarization near the membrane limits harvest MF." This restates the core limitation—consistent.  
- Option: "Osmotic pressure across the membrane is a major limitation in harvest MF." Osmotic pressure arises from dissolved solutes and is significant in tight membranes (RO/NF/UF) where solute exclusion generates a back pressure. MF separates particles that are retained mechanically; dissolved solutes largely pass and do not build a significant osmotic counter-pressure. Therefore this statement is not consistent with the introductory summary in Gottschalk §3.3.

3. Why the correct answer is correct
Because the section emphasizes particle concentration polarization and fouling as the main limitations and lists hydrodynamic/operational mitigations; it does not identify osmotic pressure as a major limitation for harvest MF. Osmotic pressure is characteristic of much tighter separations, not typical MF.

4. Why other options are incorrect (brief)
Each of the other options accurately describes a known limitation or mitigation for MF, as described above, so they are consistent with the paragraph.

Final confirmation: The correct NOT-consistent statement is "Osmotic pressure across the membrane is a major limitation in harvest MF." This matches the provided answer.

Which of the following statements is NOT consistent with the introductory paragraph of Gottschalk §3.3, which summarizes the main limitations in microfiltration (MF) and proposed mitigations?Single choice

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