Oxygen Content In Wastewater Digester Gas

In wastewater treatment, aerobic digestion enables plants to increase their capacity by injecting oxygen into the wastewater head space. This results in up to a five time increase in the treatment capacity.

Oxygen concentration is critical to the treatment process. If the oxygen concentration is too high, it is an indication that the active population of microorganisms have died off and need to be replenished. If the oxygen concentration is too low, the oxygen flow rate must be increased.

The process involves a four-stage reaction chamber. Pure oxygen is injected in the head above the liquid wastewater. Microorganisms in the water digest the waste, while consuming oxygen and producing CO2 (carbon dioxide). The oxygen level in the fourth stage is measured by the XMO2. The transmitter is used control the flow of oxygen and wastewater on demand to enable optimal digestion.