LYNX and ABGC publish new CFD simulation article combined with biological process modelling (ASM) of activated sludge

Continuing with its line of innovation, technology transfer and expansion, ABGC and LYNX Simulations participate in the publication of a novel CFD simulation article, combined with biological process modeling (ASM), in the Water Research journal, with the highest impact index in the category «Water resources»:




Sánchez, F., Rey, H., Viedma, A., Nicolás-Pérez, F., Kaiser, A.S., Martínez, M. (2018) CFD simulation of fluid dynamic and biokinetic processes within activated sludge reactors under intermittent aeration regime. Water Research 139 (45-47).



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.

Access to the article in the following LINK:



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Free software

Simulation of biological organic matter and nitrogen removal processes based on the model ASM1 (Activated Sludge Model No. 1) of the IWA

CFD simulation of the secondary treatment of a WWTP, specifically the biological reactor, including fluid dynamics and biological simulation

CFD simulation of the fluid and radiative processes that occur in an ultraviolet (UV) channel of a WWTP

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