Agnès Guillet

TOWARDS AN INTEGRATED CO-OPERATIVE SUPERVISION SYSTEM FOR ACTIVATED SLUDGE PROCESSES OPTIMISATION

Abstract This paper deals with the design of an integrated co-operative supervision system to optimise activated sludge wastewater treatment. For this purpose a biological wastewater treatment pilot plant, suitable for industrial up scaling and composed of a biological reactor, a settler, sludge recirculation and aeration systems, has been carried out. The reactor configuration is adjustable to treat both urban and industrial wastewater. The pilot plant scale allows to reproduce industrial hydrodynamics and is illustrated by RTD (Residence Time Distribution) measurements. The supervisory system includes instrumentation and industrial supervisor. The integrated co-operative supervision approach emphases the importance of process behavior anticipation. Information for the human operator will be extracted from a suitable model and a state estimator, which results are presented.

Dynamic Modeling of an Activated Sludge Process: Case Study on Paper Mill Effluents

AbstractThe aim of this paper is to propose a step by step method to establish and validate a relevant, dynamical model of the activated sludge process for the paper mill industry. The model is established by considering the specificities of the effluent to be treated. It uses the biochemical oxygen demand (BOD) measurement, which allows a direct correlation between the state variables of the model and the measurements. This model is validated on a pilot plant of semi-industrial size fed with industrial paper mill effluents. The parameter estimation is based on an analysis of the sensitivities. The results are compared with a model based on chemical oxygen demand (COD) partitioning which is issued from the simplification of the activated sludge model number 1 (ASM1) model. Finally, the model dealing with BOD measurements not only shows the best performances, but is also the easiest to implement, overcoming one main obstacle to efficient monitoring and control in paper mill wastewater treatment plants.

PAPERMILL WASTEWATER TREATMENT: MODEL DESIGN AND VALIDATION ON PILOT PLANT

Pulp and paper industry discharges a very important amount of effluent, which includes a major part of carbonaceous pollution. This wastewater is usually treated by biological treatment. This paper deals with the design of a model dedicated to paper mill wastewater treatment. Validation is carried out on a real industrial effluent thanks to a semi-industrial pilot plant.