Submerged Aerated Filters

Stainless steel modular biological treatment plant
Available for capital purchase or rental
High treatment efficiency: can easily meet 20mg/l TSS, 10mg/l BOD, and 5mg/l N, or better
Quick and easy to deploy
Numerous installation options
Proven and reliable design
Vertical SAF available as an option for small footprint
Low maintenance
Minimal operational input required
25+ Year lifespan
Additional Applications: Suitable for backend nitrification (NSAF) for enhanced performance.

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What are SAF Units?

The standard ATAC SAF units range from ATS24, ATS32, ATS44, to ATS55; however, bespoke SAFs can be designed and manufactured depending on specific requirements. SAFs can provide treatment for a range of populations and loadings. These units can be installed above or below ground, providing flexibility in their configuration to suit site requirements. ATAC SAF units utilise a series of individual cells through which the wastewater flows to maximize retention time. Each cell contains rigid block media with a high specific surface area, promoting the growth of biomass. Fine bubble diffusers provide even air distribution and maximum oxygen transfer efficiency to each cell. This process allows the SAF to effectively remove contaminants from the wastewater, producing clean effluent.

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Operational Processes

The operational processes of SAF units are designed for robustness, reliability, and minimal operator involvement. The wastewater enters the first cell of the SAF unit and flows through the biomass media. The biomass feeds on the organic matter present in the wastewater, reducing the levels of BOD (Biochemical Oxygen Demand) and other contaminants. The clean effluent then exits at the surface of the final cell. SAF units are equipped with air control valves near access hatches, allowing for easy access and accurate process trimming to optimise performance.

Versatile Applications

SAF units can be used in various applications, including stand-alone treatment, emergency cover during refurbishment or breakdowns of other systems, supplementing or replacing existing systems, and as part of a complete sewage treatment works.

SAF units require minimal operator involvement and maintenance. The lack of moving parts and the use of stainless steel in their construction contribute to their low maintenance needs. However, regular inspections and occasional servicing are necessary to ensure optimal performance.

High Treatment Efficiency

SAF units are designed to meet stringent effluent quality standards. Typical effluent quality after treatment by SAF units and settlement can easily meet 20mg/l TSS (Total Suspended Solids), 10mg/l BOD (Biochemical Oxygen Demand), and 5mg/l Ammoniacal nitrogen as N, or better, with results verified by the Environment Agency.

Emergency Hire Units Available

SAF units are available for emergency hire. These units provide a temporary solution to maintain wastewater treatment while repairs are being carried out. The hire units are easily transported and can be delivered by HIAB lorry for convenient offloading. Additionally, installation and commissioning services are available to ensure the seamless integration of the emergency hire units into the existing wastewater treatment infrastructure.

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Emergency Hire Units

Please use the form below to request a quote for our emergency hire units.