Cascade control strategy for external carbon dosage in predenitrifying process

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We propose a cascade control strategy composed of two Proportional-Integral (PI) controllers to regulate the nitrate concentration in the predenitrifying process by manipulating the external carbon dosage. It controls the nitrate concentrations in the effluent as well as in the final anoxic reactor simultaneously to strictly satisfy the quality of the effluent as well as to remove the effects of disturbances more quickly. The design of two PI controllers in the cascade control loop can be completed with the Ziegler-Nichols (Z-N) tuning rule together with a simple relay feedback identification method. Results from the Benchmark simulation confirm that both good set point tracking and satisfactory disturbance rejection can be guaranteed due to the structural advantages of the proposed cascade control strategy. Also, compared with a previous work, the fluctuation of the nitrate concentration in the effluent has been decreased significantly.
Publisher
I W A PUBLISHING
Issue Date
2002
Language
English
Article Type
Article; Proceedings Paper
Keywords

ACTIVATED-SLUDGE PROCESS

Citation

WATER SCIENCE AND TECHNOLOGY, v.45, no.4-5, pp.53 - 60

ISSN
0273-1223
URI
http://hdl.handle.net/10203/82222
Appears in Collection
RIMS Journal Papers
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