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This paper presents the automation of a real activated sludge wastewater treatment plant, which is located at San Antonio Ajijic in Jalisco, Mexico. The main objective is to create an on-line automatic supervision system, and to regulate the dissolved oxygen concentration in order to improve the performances of the process treating municipal wastewater. An approximate mathematical model is determined in order to evaluate via simulations different control strategies: proportional integral (PI), fuzzy PI and PI Logarithm/Antilogarithm (PI L/A). The controlled variable is dissolved oxygen and the control input is the injected oxygen. Based on this evaluation, the PI L/A controller is selected to be implemented in the real process. After that, the implementation, testing and fully operation of the plant automation are described. With this system, the considered wastewater treatment plant save energy and improves the effluent quality; also, the process monitoring is done online and it is easily operated by the plant users. [ABSTRACT FROM PUBLISHER]

This article deals with the design of a fuzzy control strategy for a fluidised bed reactor, which is used for anaerobic wastewater treatment. This strategy is composed of a supervisor system and two PI L/A controllers. In addition, a biomass observer, designed on the basis of the Takagi–Sugeno approach considering a principal component analysis, is used with supervision proposals. The supervisor is also designed following the Takagi–Sugeno methodology; it detects the process state, selects and applies the most adequate control action in order to avoid the washout region. On the other side, two control actions are designed for bicarbonate regulation using the PI/LA technique: adding a base and dilution rate. These control actions, as well as the open loop operation, are selected by the supervisor in order to reject disturbances on the substrate influent allowing at the same time a high methane production. The applicability of the proposed structure in a fluidised bed reactor is illustrated via simulations. [ABSTRACT FROM AUTHOR]

This paper deals with the measurement problem on activated sludge process for industrial wastewater treatment. For an efficient monitoring of the process, frequent measurement update is essential but can not be realized with standard methods which are time consuming. In order to reduce the required time to obtain a measurement and easily data for modelling or observation validation, several correlations between main measurements have been established: BOD21 vs. BOD5, BOD5 vs. CODs, VSS vs. TSS and TSS vs. CODp. All the results have been collected on a semi-industrial pilot process provided with a real paper-mill effluent. [ABSTRACT FROM AUTHOR]

The purpose of this work is to contribute, through better supervision, to improve the efficiency of a specific wastewater biological treatment plant of the Matussière and Forest Group. This paper presents the design of a dynamical model of the aeration tank, which allows to anticipate treatment difficulties. Given the great complexity of the process, an urban model established by the European action COST 624 has been adapted to the industrial treatment station. The simulation results, compared with measurements taken directly on the industrial site demonstrate that this approach is available. [ABSTRACT FROM AUTHOR]