Digester gas (typically 65% methane and 35% carbon dioxide) is produced when organic matter, such as raw sewage, decomposes in the absence of oxygen. Modern WWT processes incorporate digester gas flow measurement systems for the plant’s process performance and control, as well as a source of fuel to generate engines for supplemental plant power. The excess gas can run onsite generators or pumps, and in some cases, is added to a larger power grid.

Sage Thermal Mass Flow Meters are ideal for monitoring the digester gas flow rate of the WWTP digesters to improve overall system balance and operation. Additionally, the flow meters are utilized for measuring the flow rate of gas for co-generation systems, measuring the amount of excess gas stored, and monitoring flare gas. The latter is essential to comply with environmental regulations and to report on greenhouse gas reduction credits.

See Related Technical Notes

Anaerobic digestion at wastewater treatment plants produces wastewater digester gas. This methane-rich byproduct can be used as an energy source. Read More >

The thermal mass flow meter is the preferred method to measure wastewater aeration airflow and excels over orifice plates and vortex shedding alternatives. Read More >