Robust and durable GRP shells
Ribbed sidewalls for additional strength
Excellent performance to cost ratio
Energy efficient blowers
Low maintenance costs
Pre-engineered or bespoke designs
Single or multi-stream projects
Above or below ground installations
What is submerged aerated filter?
The SAF process uses individual cells within the tank which are arranged in series, the wastewater flows through each chamber in sequence. Each cell contains a 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.
A blower sends air to the bottom of the bed to provide oxygen for the biomass to support the oxidation process. The air stream promotes both efficient mixing of the effluent and disturbance of any excess solids from the filter medium.
To optimise efficiency, all of our SAF products come with a steel painted kiosk as standard. This also includes a hi/lo pressure alarm and beacon.
- hotels and inns
- leisure facilities
- camping and caravan sites
- office buildings
- industrial sites
Adaptable to suit your needs
The Rewatec SAF sewage treatment plant comes in four variations, dependent upon population size and application parameters.
- single tank
- semi modular tank (two tank system)
- modular (three tank system)
- multi stream systems (bespoke application design)
How does SAF work?
The Rewatec SAF sewage treatment plants form three treatment stages; primary settlement, biological treatment (biological and aeration zone) and final settlement. Flow through all of the treatment stages from inlet to outlet occurs through gravity and integral airlift.
Primary settlement tank
In typical installations, wastewater first flows into a primary settlement tank, allowing liquids to separate from solids. The primary settlement tank is also designed to accomodate flows and load fluctuations.
Biological and aeration zone
Inside the Rewatec SAF, micro-organisms grow on floating biofilm media. They feed on organic wastewater pollutants, producing effluent composed of biomass particles and treated wastewater.
Our plastic biofilm media are specifically shaped to increase the surface area on which micro-organisms grow. This maximises their ability to treat wastewater and helps you minimise the size of the reactor.
Bubbles from aeration continuously mix the contents of the Rewatec SAF to ensure optimal contact between wastewater and micro-organisms, improving their ability to remove wastewater pollutants (such as ammonia or organic matter).
Final settlement tank
After treatment, wastewater flows in the final settlement tank. Solids accumulate at the bottom of thank before being redirected to the primary settling area by a re-circulation pump (enabling partial nutrients removal).
We stand by our products
For over 50 years, we have proudly developed sustainable and long-lasting products that make a real difference for our customers, our professional partners, and, above all, our planet.
Our experience in the industry allows us to give you a complete 20-year warranty for our Rewatec SAF sewage treatment plants and a 12-month warranty for our kiosks.