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Mathematical and Numerical Simulation for the Production of Biogas from Liquid Effluent of Paper Pulp Mill

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In this work, authors have been interested in the biogas production from effluent of paper pulp mill. The Kénitra wastewater treatment plant (WWTP) treats 4500m3 of effluents per day. The anaerobic digestion of effluents, loaded with organic matter, is done by using a continuous digester with a capacity of 1200m3 in the presence of mesophilic bacteria in a neutral environment at about 30°C. Under these conditions, the amount of biogas produced is between 600 and 2000m3/day. In order to improve and stabilize the production at a high rate, we made a biological characterization of the digester by using a mathematical model that describes the real behavior of the digesters. The modelling involved to use a step-by-step method, the Rang-Kutta method, to solve the biological equations of the model. The results obtained satisfactorily represent the production of WWTP in biogas and allows to explain the difference in the amount of biogas produced, that differs from day to day, while linking it to the initial organic carbon contained in effluents
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Biogas Production; Dissolved Organic Matter; Liquid Effluent; Anaerobic Digestion; Numerical Model; Anaerobic Phase

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