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ATU / SBR Systems
“ATU (Aerobic Treatment Unit) and SBR (Sequencing Batch Reactor) systems use oxygen and timed treatment cycles to break down contaminants, reduce nitrogen, and produce cleaner effluent for safe dispersal and reliable performance.”
- What is ATU / SBR Systems
There are 3 Basic ATU Operation Styles
Aerobic Treatment Units (ATUs) are similar to standard septic systems in that they use natural processes to treat wastewater. But unlike conventional systems, ATUs also use oxygen to break down organic matter, much the same as a municipal wastewater treatment system, but in a scaled-down version. These systems are commonly found in rural areas where public sewers are not available, and may be used for a single residence or for a small group of homes. Because ATUs decompose organic solids quickly, the wastewater leaving the system is cleaner. This aerobic treatment process produces a high quality secondary effluent, which can be sterilized and used for surface irrigation. This allows much greater flexibility in the placement of the leach field, as well as cutting the required size of the leach field by as much as half. These units are useful in environmentally sensitive areas or locations that are less suitable for conventional or gravity flow septic systems, such as inappropriate soil conditions where the water table is too high to allow the drain field to operate effectively.
Suspended Growth ATU
The most common household ATU is the suspended growth. These units have a main treatment chamber where bacteria are free-floating and air is bubbled through the liquid. The second chamber where the solids settle out is separated from the main tank by a wall or baffle. The two chambers are connected at the bottom or by a pump, and settled bacteria from the second chamber are brought back into the main treatment chamber. It is this process of return and mixing that is important for effective operation.
Fixed-Film Reactor ATU
