MMBR small community system
The Moving Bed Biological Reactor (MBBR) wastewater treatment plant incorporates the primary and secondary stages of wastewater treatment, using the mechanical aeration process housed within concrete tanks to achieve a 20:30 standard (mg/l BOD:mg/l TSS).
The MBBR system is a robust package treatment plant that offers simplicity of design, installation and operation and can be designed for small to large populations.
The concrete tanks of the MBBR provide an additional system design option for customers. Among other site conditions, concrete tanks are particularly suited for use where a deep invert level is required.
The MBBR treatment process can be provided for new sewage treatment works or for retrofitting or upgrading existing wastewater treatment plants where a higher treated effluent standard is required.
Where it is used
Suitable applications include:
- Housing developments
- Commercial premises
- Caravan parks
- Golf clubs
- Nursing homes
Benefits of MBBR
- High treated effluent quality
- Small footprint
- Robust treatment plant (concrete tanks)
- Below ground installation
- Simplicity of design, installation and operation
- Suitable for a broad range of applications
How it works
The MBBR process employs a submerged ring media onto which micro organisms can attach. The biomass retained on the ring media provides effective treatment for the effluent.
The ring media are kept in motion by coarse bubble aeration. The air introduced into the tank is sufficient to ensure thorough mixing and turnover of the media within the reactor.
Three stage treatment
|1. Primary Settlement||2. Aeration||3. Final Settlement|
|Initial settlement of wastewater and separation of gross solids occurs in the primary settlement tank. The gross solids in the wastewater form a sludge at the bottom of the tank and lighter social debris forms a crust on the surface. The settled liquor that is contained between the sludge and crust passes forward through an outlet filter for treatment in the Aeration Chamber||The Moving Bed Biological Reactor (MBBR) employs a submerged media onto which micro organisms attach. This biomass requires oxygen to flourish. This is supplied by aerating the liquid in the chamber. The biomass retained on the media provides effective treatment for effluent. The media are kept in motion by the course bubble aeration. The air introduced into the tank ensures thorough mixing and turnover of the media within the reactor||The effluent passes forward for the final stage of treatment and enters the final settlement tank through a stilling well. This slows the velocity of the effluent and allows any remaining fine solids to settle. The base of the tank is coned allowing final settlement of the effluent to take place with minimal disturbance to any settled particles. The return sludge pump is located at the base of the tank and any remaining fine solids are returned via a sludge return line to the primary settlement tank. The treated effluent emerges from the system through the outlet for disposal|
Schematics & documentation
Schematics and documentation
The image above shows a typical MBBR layout. Features included as standard in the MBBR tank are:
- Pre-cast concrete tanks
- Cast-iron access covers
- Pumps mounted on stand, pedestal or stainless steel brackets
- Air blowers supplied and installed with separate vented kiosk
- Outdoor kiosks manufactured from powder coated steel
- Minimal civil work required
- Alarm system included as standard
- Treatment plant installation
- Project supervision for treatment plant installation
- On-site training provided
- Service log available
- Primary treatment: outlet filters installed
- Aeration stage: self-cleansing media
- Small footprint biological stage
- Final settlement: timed interval return sludge
- MBBR Brochure 1 MB
Spares & accessories
The following spares and accessories are available for the MBBR small community system.