Community Research and Development Information Service - CORDIS

Fault detection and isolation system for SBR's

The results take into account the following tasks : to get a redundancy relation which is necessary to solve a FDI issue with analytical methods; to establish the causal model for the POLIMI reactor, participants of WP6 established a communication with POLIMI; to propose together with POLIMI a possible solution to the excessive nitrite outflow problem. To the diagnosis of faults in the DOx sensor the procedure was tested by simulation changing the parameter associated to the thickness to emulate a fouling membrane. The simulator used for the test includes a screen in which the operator can be trained how the detector must be managed.

The results shown that temperature disturbances and sporadic sensor calibration affect the accuracy of the diagnosis; systematic test at the same environmental conditions are suggested. The disadvantage of this design is the addition of specific electronic hardware in the device for each market devise and that the operator has to select manually when the test is carried out. The validation of the detector of faults in the servo-valve was made using the data available by the DAMADICS project for the 3 considered faults. In all the cases the on-line adaptive standardization of data reduced the false alarms and yielded a satisfactory performance as fault detector.

To test the classification methods using the respiration, a comparison of the diagnosis results by simulation for three sets of classes was made and shown that the percentage of correct diagnosis is above 95% for all tested cases indicating that the features contain enough system information for the diagnosis and then both classifiers achieve satisfactory performance. The code of the system in MATLAB software is available in the annex.

The experiments related to the nitrites build up issue show that diverse situations can produce this abnormal condition. Then a simple monitoring system is recommended which evaluates the corresponding process signals and indicates the operator if some of the conditions that could cause nitrite build-up occur.

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