An STP treats domestic sewage (from homes, apartments, hotels). It removes organic waste, bacteria, and suspended solids before reuse or discharge.
⚙️ STP Process Flow (Steps)
1. Preliminary Treatment
Screening (removes plastic, debris)
Grit chamber (removes sand)
2. Primary Treatment
Sedimentation tank
Heavy solids settle as sludge
3. Secondary Treatment (Biological)
Aeration tank (bacteria break down organic matter)
Secondary clarifier
4. Tertiary Treatment
Filtration (sand filter, carbon filter)
Disinfection (chlorine/UV)
5. Sludge Handling
Sludge is treated and reused/disposed