Description

1. Preliminary Treatment: Screens remove large debris like plastics and rags, while a grit chamber settles sand and stones.
2. Equalization Tank: Collects raw sewage to balance flow and concentration, ensuring a steady feed into the biological reactors.
3. Anoxic Tank (Optional): Used specifically for denitrification (removing nitrogen) if required by local environmental standards.
4. MBBR Aeration Tank: The “heart” of the system. It contains:
   • Bio-media: Small plastic carriers (filling 25–70% of the tank volume) where the biofilm grows.
   • Aeration Grid: Diffusers at the bottom that provide oxygen and keep the media in constant motion.
   • Retention Sieve: A mesh screen that prevents the plastic media from leaving the tank with the water.
5. Secondary Clarifier: A settling tank where remaining biological solids (sludge) separate from the treated water.
6. Tertiary Treatment: Final filtration (e.g., pressure sand filters) and disinfection (e.g., chlorination) to make the water safe for reuse or discharge.

• Compact Footprint: Requires less space than traditional activated sludge systems.
• Low Maintenance: No need for “return activated sludge” (RAS) pumping, as the biomass stays attached to the carriers.
• Scalability: Capacity can be increased by simply adding more media to existing tanks.