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As an efficient fixed film wastewater treatment technology, Rotating Biological Contactors are well suited for secondary and/or advanced treatment in municipal or industrial applications. The long-term reliability of this process is evident in the more than 6,000 units operating today.
The RBC process consists of a large disc with radial and concentric passages slowly rotating in a concrete tank. During the rotation, about 40 percent of the media surface area is in the wastewater. The rotation and subsequent exposure to oxygen allows organisms to multiply and form a thin layer of biomass. This large, active population causes the biological degradation of organic pollutants. Excess biomass shears off at a steady rate and is then carried through the RBC system for removal in a clarifier.
- Consistent process results
- Stable operation without frequent supervision
- Lower expansion and retrofit costs due to modular construction and reduced excavation
- Short wastewater retention time allows for a smaller footprint
- Minimal head loss through system
- Low energy consumption (3 kW per 3,000 people)
- The only maintenance required is simple drive and bearing lubrication
- Reduced life cycle costs as compared to suspended growth systems
- Simple operation: no recycle, less lab testing for process control
- Operator friendly
- Easily modified for upgrades, retrofits and multiple applications
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