Filtration equipment — selecting a pressure filter Which one of the following is (classically) operated as a pressure filter in process industries?

Introduction / Context:
Filtration units are broadly classified by driving force (vacuum vs. pressure) and configuration (presses, leaf/tank, rotary, granular media). Correct identification affects sizing, cake washing strategy, and maintenance planning.

Given Data / Assumptions:

• Typical industrial configurations are implied.
• We seek the canonical example of a pressure filter.

Concept / Approach:
The plate and frame filter press is the archetypal pressure filter: slurry is pumped under pressure, solids form a cake between plates, and filtrate exits through channels. Rotary drum filters are most commonly vacuum-driven. Moore-type leaf units are classically vacuum leaf filters (tank leaf), although pressure leaf variants exist; the “Moore” name is strongly associated with vacuum operation in many texts. Sand filters are typically gravity or modest-pressure granular media filters used in water treatment, not cake pressure filters.

Step-by-Step Solution:
Identify the canonical pressure cake filter → plate and frame.Eliminate rotary drum (usually vacuum) and sand filter (granular media).Moore leaf commonly categorized under vacuum leaf configurations.

Verification / Alternative check:
Handbooks list plate and frame presses under pressure filtration; rotary drums under vacuum filtration.

Why Other Options Are Wrong:

• Leaf (Moore): commonly vacuum operation in classical descriptions.
• Rotary drum: standard vacuum filter.
• Sand filter: gravity/pressure granular filter, not a pressure cake filter press.

Common Pitfalls:

• Assuming all “leaf” filters are pressure devices; variants exist but the Moore design is widely taught as vacuum.

Final Answer:
Plate and frame filter