CFD simulation of fluid dynamic and biokinetic processes within activated sludge reactors under intermittent aeration regime.

Autor: Sánchez F; Departamento de Ingeniería Térmica y de Fluidos, Universidad Politécnica de Cartagena, Dr. Fleming, s/n, 30202, Cartagena, Spain., Rey H; Instituto de Ingeniería del Agua y Medio Ambiente, Universitat Politècnica de València, Camino de Vera 14, P.O. Box 46022, Valencia, Spain; Prointec S.A., C/ De San Julián nº1, 28108 Alcobendas, Madrid, Spain. Electronic address: hecregon@upvnet.upv.es., Viedma A; Departamento de Ingeniería Térmica y de Fluidos, Universidad Politécnica de Cartagena, Dr. Fleming, s/n, 30202, Cartagena, Spain., Nicolás-Pérez F; Lynx Simulations S.L., Calderón de la Barca 31, 30180 Bullas, Spain., Kaiser AS; Departamento de Ingeniería Térmica y de Fluidos, Universidad Politécnica de Cartagena, Dr. Fleming, s/n, 30202, Cartagena, Spain., Martínez M; Prointec S.A., C/ De San Julián nº1, 28108 Alcobendas, Madrid, Spain.
Jazyk: angličtina
Zdroj: Water research [Water Res] 2018 Aug 01; Vol. 139, pp. 47-57. Date of Electronic Publication: 2018 Mar 28.
DOI: 10.1016/j.watres.2018.03.067
Abstrakt: Due to the aeration system, biological reactors are the most energy-consuming facilities of convectional WWTPs. Many biological reactors work under intermittent aeration regime; the optimization of the aeration process (air diffuser layout, air flow rate per diffuser, aeration length …) is necessary to ensure an efficient performance; satisfying the effluent requirements with the minimum energy consumption. This work develops a CFD modelling of an activated sludge reactor (ASR) which works under intermittent aeration regime. The model considers the fluid dynamic and biological processes within the ASR. The biological simulation, which is transient, takes into account the intermittent aeration regime. The CFD modelling is employed for the selection of the aeration system of an ASR. Two different aeration configurations are simulated. The model evaluates the aeration power consumption necessary to satisfy the effluent requirements. An improvement of 2.8% in terms of energy consumption is achieved by modifying the air diffuser layout. An analysis of the influence of the air flow rate per diffuser on the ASR performance is carried out. The results show a reduction of 14.5% in the energy consumption of the aeration system when the air flow rate per diffuser is reduced. The model provides an insight into the aeration inefficiencies produced within ASRs.
(Copyright © 2018 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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