Case Study: Digester Biogas Flow Monitoring

A wastewater treatment plant needed to measure biogas traveling into and out of a gas line leading into a Digester Dystor gas bag. The amount of gas and direction of flow is critical for measurements to meet EPA regulations.

Previously the utility used a Vortex flow meter to measure bi-directional and low flows. The vanes, however, often clogged and stopped functioning. This would result in non-compliance with the EPA's regulation that limits gas storage to 10,000 pounds, resulting in fines and a possible plant shut down.

To solve this problem and comply with the EPA's requirement, the utility installed a VORTAB® flow conditioner with a vertical installation of FCI's GF90 thermal mass flow meter and RF83 bi-directional flow detection switch.