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 being stored, and monitoring flare gas. The latter is important to comply with environmental regulations and/ or to report on greenhouse gas reduction credits.