MISSOULA, MONTANA
The Missoula 12 mgd wastewater treatment plant is effectively reducing phosphorus with a low-cost solution that doesn’t require chemicals or filtration. The plant utilizes the Johannesburg Process with a plug-flow arrangement of seven baffles cells. The Challenge The Missoula WWTP operations team could not rely on their 10-year-old dissolved oxygen (DO) probes. “Whenever there was a problem with the activated sludge aeration control system, the first thing we would do is check the DO probes; clean them, calibrate them and then wait half a day,” according to Gene Connell, treatment supervisor. “We were spending four hours per week just maintaining the DO probes,” Gene adds.
Objective: Optical DO
Monitoring Makes Aeration Control Optimization Possible
IQSN FDO Sensor
The Solution Missoula sought to achieve more reliable measurements and lower maintenance with modern optical DO technology. There are a lot of choices when it comes to wastewater process DO probes and the Missoula WWTP evaluated a couple of brands before they settled on the FDO sensor from YSI. The Missoula team was confident in the YSI brand, but one of the deciding factors was the innovative configuration of the IQ SensorNet (IQSN) system which allowed them to network all 20 DO probes together on the same controller, reducing hardware requirements and simplifying installation. Each of the monitoring locations is linked together with a single cable which sends both power and communications throughout the network. A local electrical contractor was hired to install the system. The contractor was very impressed with the IQSN system’s ease of installation. The design of the system allows them to estimate installation costs with confidence making YSI their first choice for future projects.
IQ SensorNet 2020 XT Controller showing DO measurements
Acknowledgements: Many thanks to Gene Connell, Missoula WWTP treatment supervisor, for providing his experience with the IQ SensorNet system and sensors.
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