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Title: A framework based on finite element method (FEM) for modelling and assessing the affection of the local thermal weather factors on the performance of anaerobic lagoons for the natural treatment of swine wastewater
Authors: Brito Espino, Saulo Manuel 
Ramos Martín, Alejandro 
Pérez Báez, Sebastián O. 
Mendieta Pino, Carlos Alberto 
León Zerpa, Federico Antonio 
UNESCO Clasification: 330810 Tecnología de aguas residuales
330806 Regeneración del agua
Keywords: Modelling
Anaerobic Digestion
Free Flow Reactors
Finite Elements Analysis
Issue Date: 2021
Project: Mitigación del cambio climático a través de la innovación en el ciclo del agua mediante tecnologías bajas en carbono
Journal: Water (Switzerland)
Abstract: Anaerobic lagoons are natural wastewater treatment systems suitable for swine farms in small communities due to its low operational and building costs, as well as for the environmental sustainability that these technologies enable. The local weather is one of the factors which greatly influences the efficiency of the organic matter degradation within anaerobic lagoons, since microbial growth is closely related to temperature. In this manuscript, it is proposed a mathematical model which involves the two-dimensional Stokes, advection-diffusion-reaction and heat transfer equations. Furthermore, the Anaerobic Digestion Model No 1 (ADM1), developed by the International Water Association (IWA), has been implemented in this model. The partial differential equations resulting from the model, which involve a large number of state variables that change according to the position and the time, are solved through the use of the Finite Element Method. The simulations' results indicated that the methodology is capable of predicting reasonably well the steady-state of the concentrations for all processes that take place in the anaerobic digestion and for each one of the variables considered; cells, organic matter, nutrients, etc... In view of the results, it can be concluded that the model has significant potential for the design and the study of anaerobic cells' behaviour within free flow systems.
ISSN: 2073-4441
DOI: 10.3390/w13070882
Source: Water (Switzerland)[EISSN 2073-4441],v. 13 (7), 882
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