There are many reasons to use an aerobic treatment unit when selecting an onsite system design, including poor soils, shallow vertical separation distances to limiting conditions, horizontal setback restrictions, tight lots, high-strength wastewater, and nitrogen treatment.
The treatment process utilized in ATUs is all about providing a suitable environment for microorganisms to treat the wastewater. Mechanically induced aeration is used to keep an oxygen concentration of about 2 mg/L or 2 ppm and provide mixing within the unit. The oxygen and mixing will allow the microorganisms to break down the organic portion of the waste. In addition, mechanisms must be employed
