Georgia Commercial Contractor Septic Practice Exam

The intended outcome of using an Aerobic Treatment Unit (ATU) for wastewater treatment is primarily to reduce biochemical oxygen demand (BOD) and total suspended solids (TSS) to levels below 200 mg/L before the effluent is sent to absorption fields. This reduction is crucial because it helps to protect the environment and prevent contamination of groundwater sources.

ATUs utilize aerobic bacteria in their treatment process, which breaks down the organic matter in the wastewater more efficiently than some other treatment options. By achieving these lower concentrations of BOD and TSS, the effluent is less likely to cause harm to the receiving environment and is more suitable for further processing or disposal. This treatment approach makes it possible to utilize absorption fields effectively, as they rely on the treated wastewater being of sufficiently high quality to prevent failure of the soil absorption system and subsequent environmental impacts.

The other outcomes mentioned in the choices do not align with the primary function of an ATU in wastewater treatment. For instance, increasing the volume of wastewater sent to absorption fields is not a goal; instead, reducing pollutants in the effluent is crucial for effective treatment. Additionally, while some systems may help manage pathogens and create beneficial byproducts, complete elimination of all pathogens is often not guaranteed, and