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The paper presents several attempts to solve the problems of concentration peaks, microbial activity diminution due to substrate starvation, as well as the maintenance of a reliable performance of an aerobic sequencing batch bioreactor degrading inhibitory wastewaters. Two main solution lines have been followed: on one side, several control strategies, based on the measurement of the dissolved oxygen concentration, have been proposed. On the other side, the use of fixed biomass, or a mixture of suspended and fixed biomass, instead of suspended biomass has been pursued in order to overcome the problems mentioned above. It was observed that if no especial control strategy is designed the SBR systems with attached biomass have a better resistance against concentration peaks and toxic starvation than the suspended biomass systems. However, these solutions are not enough to increase sufficiently the performance of the SBR under extreme operating conditions. It was observed that sophisticated control strategies as the time optimal control greatly increased the robustness and performance of the SBR to levels never obtained before without them.
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Document Type: Research Article

Publication date: 2005-01-01

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