Rotating Biological Contactor Systems

Rotating Biological Contactor (RBC) central to the KEE wastewater treatment technologies

At the heart of KEE’s advanced wastewater treatment solutions is our Rotating Biological Contactor (RBC) technology. RBCs use a biologically active film of aerobic micro-organisms to deliver highly efficient, sustainable sewage treatment for both domestic and commercial applications.

Let us help you protect your property from costly breakdowns. Book your RBC system service online today and benefit from our expert advice.

Flexible RBC Solutions for Every Site

KEE’s RBC technology is suitable for a wide range of installations, from single residential homes to significant housing developments, leisure centres, hotels, and hospitals. Regardless of the site conditions or wastewater volume, our RBC treatment plants are designed to deliver reliable and compliant performance every time.

Our Range of RBC Treatment Plants

• NuDisc® and NuDisc-R: Single-piece packaged RBC systems designed for ease of installation and operation.
• Modular Packaged DC/DN Systems: Flexible, scalable RBC units ideal for medium to large wastewater flows.
• Large Diameter RBCs: Custom-engineered systems designed for on-site erection, providing robust treatment capacity for significant projects.

Why Choose KEE’s RBC Technology?

• Proven, low-energy sewage treatment process.
• Scalable solutions to match your site and flow requirements.
• Long-term reliability with reduced operating costs.
• Designed to meet environmental standards and discharge consents.

Whether you need a compact packaged plant or an extensive modular RBC system, KEE delivers wastewater treatment technology that is cost-effective, environmentally friendly, and built to last. Contact us today for fast, reliable service you can trust.

FAQs

What is a Rotating Biological Contactor (RBC) and how does it treat wastewater?

A Rotating Biological Contactor (RBC) is a fixed-film secondary wastewater treatment technology that breaks down organic pollutants using natural biological processes. An RBC system consists of closely spaced circular plastic media discs mounted on a horizontal shaft, which slowly rotates within a wastewater trough.

As the biological contactor rotates, the media alternately submerges in effluent and is exposed to atmospheric oxygen. This creates an optimal environment for a thin layer of naturally occurring aerobic microorganisms (biofilm) to cultivate. When submerged, these microorganisms feed on dissolved organic matter and nutrients; when exposed to the air, they absorb the oxygen required to sustain biological breakdown. The result is a robust, low-energy sewage treatment process that delivers high effluent quality and reliable regulatory compliance.

How does a biological contactor differ from an activated sludge system?

While both are secondary biological treatment methods, their core mechanics and operating requirements differ substantially:

• Biological Contactor (Fixed-Film): Microorganisms grow directly on rotating media packs. Because the biomass is fixed rather than suspended, an RBC system resists shock loading, produces minimal noise, requires low power, and needs far less day-to-day process monitoring.
• Activated Sludge (Suspended-Growth): Microorganisms are suspended in wastewater through continuous mechanical aeration or blown air diffusion. This process typically requires higher energy consumption, extensive electrical infrastructure, and routine sludge-return balancing to avoid process upset.

For decentralised domestic sites, hotels, healthcare facilities, and commercial developments, a rotating biological contactor offers substantially lower lifecycle operating costs and simpler operational oversight.

What applications are best suited for KEE Rotating Biological Contactor systems?

KEE’s RBC systems provide flexible, scalable treatment across a wide spectrum of applications where municipal sewer connection is unavailable or cost-prohibitive:

• Single and Multi-Property Residential: Custom and packaged units for individual homes, small estates, and off-grid housing developments.
• Commercial & Leisure: Hotels, holiday parks, golf clubs, visitor centres, and country estates subject to fluctuating seasonal loads.
• Institutions & Healthcare: Hospitals, care facilities, and schools that require quiet, odour-free, reliable on-site treatment.
• Municipal & Industrial Expansion: Scalable modular DC/DN units and large-diameter bespoke biological contactor plants engineered to handle high-volume municipal or industrial effluent.

What are the maintenance requirements for a rotating biological contactor?

An RBC system is mechanically straightforward, but routine planned maintenance is essential to safeguard mechanical integrity, prevent costly emergency breakdowns, and maintain Environment Agency discharge compliance:

• Routine Servicing: Drive motors, reduction gearboxes, bearings, shafts, and drive belts require regular lubrication, alignment checks, and tension inspections by qualified service engineers.
• Biofilm Monitoring: Engineers check the thickness and health of the biomass on the biological contactor discs to verify healthy treatment kinetics and ensure no uneven mechanical loading on the central shaft.
• Sludge Management: Primary settlement and final settlement stages must be desludged on schedule to prevent solids carry-over into the rotating disc stages.

KEE Services provides nationwide planned maintenance contracts, refurbishment services, and 24/7 breakdown support to keep your RBC system running at peak efficiency.

What discharge consent standards can an RBC treatment plant achieve?

KEE Rotating Biological Contactor plants are custom-configured to achieve stringent national environmental standards and local discharge permits:

• Standard BOD & SS Reduction: Consistently achieves standard 20:30 discharge standards (20mg/LBOD:30mg/LSuspendedSolids).
• Nitrification (Ammonia Removal): Multi-stage biological contactor layouts promote nitrifying bacteria in subsequent stages, frequently achieving effluent ammonia concentrations below 5mg/L or even 1mg/L where sensitive watercourses require it.
• Tertiary Polish & Nutrient Removal: Can be paired with integrated denitrification (DN modules) or tertiary filters to comply with sensitive nutrient neutrality and phosphate restrictions.

Why choose a KEE NuDisc® or large-diameter RBC over alternative systems?

KEE combines over 65 years of wastewater engineering expertise with proven equipment designs built for decades of service:

• Low Energy Consumption: Slow shaft rotation consumes a fraction of the electricity required by continuous-blower or high-pressure diffused aeration systems.
• Lifetime Warranty Availability: KEE offers a Lifetime Warranty on new NuDisc® installations supported by an Elite KEE Services and Maintenance contract.
• Self-Regulating Biomass: The fixed-film biological contactor naturally self-adjusts to seasonal spikes and low-flow periods without losing active treatment biomass.
• Single-Source Engineering & Support: From initial plant sizing and bespoke UK manufacture to installation, commissioning, tankering, and nationwide servicing, KEE provides end-to-end support for the life of your asset.

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