Open Channel Flow for Water Reclamation Plant

Successful Open Channel Flow Measurement for Jurong's Water Reclamation Plant.

The Jurong Water Reclamation Plant collects sewage and wastewater from houses, factories, and commercial and industrial premises. Sewage enters the inlet chamber of the works and flows through automatically controlled mechanical bar screens to remove rags and fibrous materials. Waste from the screening process is then sent to the press before being disposed of. Then, the sewage detractor removes any grit and heavy solids. After the grit chamber, the wastewater flows into primary sedimentation tanks where the primary sludge that settles in the bottom of the tank is thickened before being pumped through to the digestors. The wastewater then flows into aeration tanks, where mechanical surface aerators provide oxygen for the activated sludge process. The mixed liquor from the aeration tanks then flows into the final sedimentation tanks to settle down the solids, and the final effluent is discharged through a concrete pipeline into the sea.

Engineers at the water reclamation center contacted engineers at Pulsar Measurement for help with their mag flow meters. The existing ultrasonic flow meter was not matching the readings from their existing mag glow meter at one of their inlet pipes. Engineers wanted a more specific flow meter that gave more accurate readings and required little to no maintenance.

Pulsar Measurement offers a few different solutions for area-velocity measurement. The dBMACH3, MicroFlow, and FlowCERT are non-contacting solutions. The MicroFlow & dBMACH3 sensors are mounted above the moving liquid, never encountering the measurement medium, therefore, requiring little to no maintenance. The open channel level is calculated by the dBMACH3, while the surface velocity of the flowing liquid is measured by the MicroFlow. Both readings return to the FlowCERT controller, which performs a calculation to show real-time flow.