The TETRA® SAF submerged aerated filters are a simple process for the biological oxidation of ammonia-nitrogen (NH3-N) and BOD for both municipal and industrial wastewaters. TETRA SAF offers exceptional performance, reliability, flexibility and operational and maintenance cost savings over competitive systems. TETRA SAF is an upflow, fixed-film biological reactor that uses coarse media requiring no backwashing. A robust, small footprint system, it can be used for either secondary treatment (SAF/cSAF) or as a tertiary (nitrification) stage (NSAF). When combined with primary and final settlement, TETRA SAF offers a complete high performance treatment process.
Effluent qualities of 5:1 BOD to NH3-N (mg/l) can easily be achieved. Effluent NH3-N of less than 0.5 mg/l has been demonstrated. Typical loading rates of 80 lbs/1000 ft3/day BOD and 30 lbs/1000 ft3/day ammonia can be achieved.
The TETRA SAF process uses proven TETRA T-Block™ underdrain filter blocks and blast furnace slag media for long life and minimized replacement costs. Other media such as structured plastic can also be used to meet application specific requirements.
TETRA SAF submerged aerated filer system are available in packaged modular plants through to large custom designs.