What does DO mean

Dissolved oxygen (DO) is the amount of oxygen dissolved in water, expressed in mg/L.

Different biochemical treatments have different requirements on dissolved oxygen. In the process of aerobic biochemistry, dissolved oxygen in water is generally between 0.2-2.0mg/L, while in the process of aerobic biochemistry of SBR, dissolved oxygen in water is generally between 2.0-8.0mg/L. Therefore, the aeration rate should be small and the aeration time should be short during the operation of the aerobic tank. While in the SBR aerobic tank operation, the aeration capacity and aeration time are much larger and longer, and we use contact oxidation, the dissolved oxygen is controlled at 2.0-4.0mg/L.