Which filter type is best suited for gelatinous solids that tend to plug the septum, by first depositing a protective pre-deposited layer on the medium?

Introduction / Context:
Gel-like or highly compressible cakes can blind a filter medium rapidly. A precoat technique deposits a porous layer (e.g., diatomite or perlite) on the septum before filtration, preventing blinding and stabilizing flow resistance.

Given Data / Assumptions:

• Feed contains gelatinous solids.
• Objective is to avoid septum plugging.

Concept / Approach:
Precoat filters operate by first laying down an expendable filter aid layer. During filtration, fine or gelatinous solids lodge in this porous cake instead of directly in the septum, preserving permeability and allowing periodic removal/regeneration of the precoat.

Step-by-Step Solution:
Recognize plugging tendency of gelatinous solids.Use a sacrificial precoat to intercept fines.Select “Precoat filter.”

Verification / Alternative check:
Industry practice: kieselguhr or perlite precoats are standard in beverages, pharmaceuticals, and chemical services with slimy solids.

Why Other Options Are Wrong:
Sparkler/plate-frame/vacuum leaf: can blind quickly without precoat.Cartridge: also prone to rapid fouling by gels.

Common Pitfalls:
Attempting to filter without filter aids; throughput collapses as resistance skyrockets.

Final Answer:
Precoat filter