Online process monitoring improves nitrification

Problem: With already high ammonium levels and new compliance limits, the Meander Water Resource Recovery Facility in Mahoning County, Ohio, needed a more reliable solution than once- or twice-weekly grab sample measurements — specifically a new instrumentation and monitoring system with real-time data for ammonium, nitrate and pH — to improve the nitrification process.

Solution: The facility chose the IQ SensorNet from YSI, a Xylem brand. The monitoring system includes an IQSN 2020 controller and VARiON 700 probes with ammonium, nitrate and potassium electrodes, wired into a junction box (MIQ/JB) at the first- and second-stage clarifiers. In addition, a SensoLyt probe with a pH electrode was installed in the second-stage clarifier. The measurements are continuously communicated to the IQSN 2020 in the control building via a wireless module. Control over the nitrification process is easily maintained with real-time data.

Result: The facility has stayed in permit compliance and reduced maintenance time and cost. The IQSN system provides accurate, reliable data without the need to calibrate for weeks or even months. The operators can address issues faster, more effectively and more efficiently. 800-765-4974; www.ysi.com