What is the standard process term for removing fine suspended solids from liquids under gravity in a clarifier or settling tank?

Introduction / Context:Liquor–solid separation can be achieved by gravity settling, flocculation, filtration, or centrifugation. The terminology matters in water treatment and mineral processing.

Given Data / Assumptions:

• Fine solids are removed from liquids using gravity in tanks.
• No filter media is involved.

Concept / Approach:Sedimentation is gravity settling of discrete or flocculated particles. Decantation is the subsequent removal of clarified supernatant. Flocculation is a conditioning step to form larger aggregates. Classification is size-separation of solids by settling velocity in hydraulic devices.

Step-by-Step Solution:Identify the core operation: settling under gravity.Choose the process term: sedimentation.Differentiate from ancillary steps (flocculation/decantation).

Verification / Alternative check:Water treatment unit operations name primary settlers as sedimentation basins, confirming nomenclature.

Why Other Options Are Wrong:Decantation: liquid withdrawal, not the settling mechanism.Flocculation: pre-treatment aiding sedimentation.Classification: solid–solid hydraulic sorting.

Common Pitfalls:Interchanging “sedimentation” and “decantation” in reports; they are distinct steps.

Final Answer:Sedimentation