MBBR (Moving Bed Biofilm Reactor) utilizes freely suspended plastic biofilm carriers to facilitate attached microbial growth. These plastic carriers have a density close to that of water and remain suspended through continuous aeration, ensuring effective contact between pollutants and the attached biofilm for efficient BOD removal.
Features of MBBR:
1. Simple construction and easy operation.
2. High organic removal efficiency with effective nitrogen and phosphorus removal.
3. Resistant to clogging and does not require regular backwashing.
4. Requires a sedimentation process after treatment.
MBR (Membrane Biofilm Reactor) is a process that combines membrane separation technology with activated sludge. Most MBR systems are submerged in wastewater, utilizing microorganisms attached to the membrane surface to degrade organic matter.
Features of MBR:
1. Capable of operating under high volumetric loading and low sludge loading, resulting in low excess sludge production (theoretically achieving zero sludge discharge) and reduced sludge treatment costs.
2. Maintains high MLSS concentration in the reactor, allowing for high volumetric loading and reduced footprint.
3. High microbial mass requires sufficient aeration, leading to higher operational energy consumption.
4. Prone to membrane fouling, requiring periodic membrane cleaning or backwashing.
FBR (Fixed Bed Biofilm Reactor) operates on a principle similar to MBBR, with the key difference being that the biofilm attaches to fixed solid media. Aeration is provided beneath the solid media to supply oxygen for biofilm growth and to control biofilm cleaning.
Features of FBR:
1. Capable of treating wastewater with significant fluctuations in flow rate and organic content.
2. More convenient operation and lower energy consumption compared to MBBR (due to direct bottom aeration).