Submerged Aerated Filters

  • Scalable modular treatment system
  • Available for capital purchase or hire
  • Requires very little maintenance (few moving parts)
  • Atac SAF can be used to accommodate 100 — 3000 persons

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What is a SAF?

A SAF is a scalable modular wastewater treatment system available for capital purchase (up to 3000PE) or hire (up to 800PE). It is available in above or below ground configurations and can be used to accommodate 100 – 3000 people.
The control system can be supplied to customer’s specification and the kiosk is thermostatically controlled for reliability.

How Do SAFs Work?

The SAF process is based on individual cells which are arranged in series and through which the wastewater flows. Each cell contains a rigid block media on which biomass forms, and a fine bubble diffuser system feeds oxygen from blowers in the control kiosk to promote the growth of the biomass. Wastewater passes through the biomass which feeds on the BOD and the clean effluent exits at the surface of the final cell.

Low Maintenance

The plant is designed for robustness, reliability and minimal operator involvement. Each installation fitted with an integral lamella settling zone and auto desludging for trouble free operation.
Air control valves are sited near access hatches for ease of access for accurate process trimming which facilitates optimum performance.

The Results

Typical effluent quality after treatment by our SAF units and settlement can easily meet 20mg/l TSS, 10mg/l BOD and 5mg/l Ammoniacal nitrogen as N, or better, with results verified by the Environment Agency.

Long Lifespan

Stainless steel construction for extended lifespan (Budget GRP version available). There are no moving parts in the tank, the diffusers have a design life of 15 years and key parts of the plant have built-in redundancy.

Applications Include

  • Stand-alone for biological treatment
  • Emergency cover
  • Supplement or replace an existing system
  • Part of a complete sewage treatment works
  • Above or below ground configurations available

Key Benefits

  • Simple to operate
  • Robust in performance
  • No moving parts or machinery in the treatment tank
  • Very small footprint
  • Will treat wastewater to a standard of 20mg/l TSS, 10mg/l BOD and 5mg/l Amm N*

*After final settlement - even higher quality achieved with ATAC tertiary treatment modules added.

Emergency Hire Units Available

  • For use during refurbishment of biological filters or breakdown repairs
  • We deliver by HIAB lorry for easy offloading
  • Installation and Commissioning service

We can commission the system for you, and also offer a comprehensive service and maintenance package for complete peace of mind.