Description
A Moving Bed Biofilm Reactor (MBBR) sewage treatment plant uses a specialized biological process where microorganisms grow on small, floating plastic carriers. These carriers move freely within an aeration tank, providing a high surface area for bacteria to break down organic waste.
Core Components of an MBBR System
An efficient MBBR-based Sewage Treatment Plant (STP) typically follows these stages:
- Preliminary Treatment: Screens remove large debris like plastics and rags, while a grit chamber settles sand and stones.
- Equalization Tank: Collects raw sewage to balance flow and concentration, ensuring a steady feed into the biological reactors.
- Anoxic Tank (Optional): Used specifically for denitrification (removing nitrogen) if required by local environmental standards.
- 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.
- Secondary Clarifier: A settling tank where remaining biological solids (sludge) separate from the treated water.
- Tertiary Treatment: Final filtration (e.g., pressure sand filters) and disinfection (e.g., chlorination) to make the water safe for reuse or discharge.
Why Choose MBBR?
- 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.
Would you like to see a specific flow calculation for a particular daily sewage volume (e.g., 100 KLD)?
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