Disturbance Rejection Problem in the Control of Wastewater Treatment Systems

Wastewater treatment systems are unreliable in terms of their performance. many parameterscourd affect their efficiency in which load disturbances are the major cause of large perturbationsin the system and the consequent deterioration in the effluent quality. it is known that thevariation of the influent flow rate is more important than variations of the various componentsof the influent. in this paper, the effect of influent flow variation on the system has beenmodeled and added to the control system structure, in order to alleviate the performance problem.the control system is based on pip/tdc methodology, which has been published in numerouspapers since 1987 and also described briefly here. this kind of control system could bringsome advantages to wastewater treatment systems, compared to other more well-known controlsystems. all experiments have been applied to an activated sludge simulation benchmark andthe results show an improvement in the control performance.