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Early alerts on a degrading oxidation ditch rotor prevent two pollution events and up to €900k in costs

Twice, SAM4 Health provided early warning of gearbox degradation though the vibration system had not yet alerted the customer to a problem.


Aeration rotors are essential assets in the wastewater treatment process. A broken rotor instantly reduces site capacity — but the incoming flow doesn’t slow down. To avoid the risk of a pollution incident, it’s critical to know when oxidation ditch rotors are degrading, so preventive maintenance can be planned at a time that does not endanger the plant’s ability to keep up.


At a wastewater treatment plant, SAM4 Health is installed on four aeration rotors. During the first year of monitoring, SAM4 alerted the customer to two developing faults on one of the rotors. Thanks to these alerts, the customer was able to schedule and perform the required maintenance without disruption to site capacity.

In both cases, SAM4 detected an increase in spectral energy at the rotational frequency of the motor, which is an indicator for mechanical unbalance. The customer also has a vibration condition monitoring system installed on the rotor, but that system had not yet alerted to an anomaly in either case. In both cases, the customer replaced the gearbox. After this maintenance, SAM4 confirmed a return to healthy behavior.

sam4 graph 1400w
SAM4 data for one of the two fault detections. The customer was alerted at the first blue line; after they performed maintenance, SAM4 confirmed a return to healthy behavior at the second blue line. At the customer’s request, the OEM examined the faulty gearbox after this incident, and reported heavy wear on the input shaft and pinion bore.


Thanks to SAM4’s early alerts, the customer was able to avoid two critical disruptions to its wastewater treatment process. These two detections prevented €54k in maintenance costs, €40k in emergency mitigation costs, and up to €800k in pollution event fines.

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