The Brockton Advanced Water Reclamation Facility (AWRF) in Brockton, Massachusetts, is a 14 mgd facility that utilizes YSI’s IQ SensorNet to optimize its four-stage Bardenpho aeration process. These water quality sensors help Brockton effectively reduce total nitrogen and meet a stringent effluent limit of 3 mg/L. The integration of IQ SensorNet provides accurate, continuous monitoring, enabling precise aeration control that directly contributes to energy savings.
Brockton AWRF’s treatment process and sensor placement
Brockton AWRF’s aeration basins are equipped with a comprehensive suite of water quality sensors. Each aeration basin features three FDO sensors to monitor dissolved oxygen levels in the aerobic and post-aerobic zones. Additionally, two NitraVis UV-nitrate sensors are positioned in the pre-and post-anoxic zones to track denitrification, one SensoLyt pH sensor is located at the effluent to monitor pH, and one AmmoLyt ion-selective electrode ammonia sensor is placed in the aerobic zone where ammonia levels fluctuate between 1 to 10 mg/L daily.
Placement of the ammonium sensor is critical for ammonia-based aeration control at the plant. A pilot study determined that probes reading greater than 1 mg/L ammonia for most of the day are optimally positioned for process control. Notably, nutrient loading variations led to different sensor placements in the South aeration train.
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