Aerobic treatment units (ATUs) rely on air injection systems to create an oxygenated (aerated) environment, which is able to support bacterial populations that break down organic material. This aeration process produces an effluent that is lower in total suspended solids (TSS) and biochemical oxygen demand (BOD) than that of conventional systems. The injection of air into the ATU agitates the wastewater, so solids are readily mixed with the bacteria, facilitating digestion of