Community Research and Development Information Service - CORDIS

Event-driven control strategies for SBR's

This result is concerned with the design and implementation of sub-optimal controllers called ED-TOC (Event-driven Time Optimal Control). The control strategies provided tools to minimize the reaction time and ensure high purification performances. In a second step, it allowed to increase the wastewater volume treated within a time interval. The increase of the loading rate was taken into account as constraint in order to maintain good biological activities for nutriment removal and a good settling capacity for the sludge.

This last point is important in order to guarantee an optimal separation of the purified water and the biomass. The control software developed (BIOREC, acronym for BIOREeactor Control) was modified (rewritten) in order to comply with the different system specifications. The goal was to provide capabilities for integration, i.e. for using the same control software in different hardware platforms and in different high level software configurations.

The ED-TOC exhibited a reliable suboptimal behaviour and long-term biological stability. Results were validated both in lab-scale and field-scale reactors for 4CP. ED-TOC�s robustness to shock loads disturbances, up to 20 times the standard load, was observed while still maintaining a suboptimal operation. The comparative analysis of the ED-TOC versus FTC shows an increase of 63% to 90% in applicable daily load, and savings in energy and in consumed air in the range of 25% to 39%. Modularity and integrability were also obtained in the controller�s hardware and software.

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