Abstract
In this paper a novel hydrodynamic wastewater treatment (WWT) model based on smoothed particle hydrodynamics (SPH) is presented. The hydraulics of the wastewater treatment plant is modelled in detail with SPH. The SPH solver is coupled to the activated sludge model such that the influence on biokinetic processes is described. The key innovation of the present WWT model is that both the biokinetics and the wastewater hydraulics are simultaneously solved for non-steady flows. After validating the present method against the software ASIM 5, the capabilities are demonstrated for a full-scale treatment plant simulation. We investigate the stirrer and aeration induced mixing within the reactor compartments as well as the resulting concentrations of the biokinetic compounds. Following the establishment of a local coupling between the hydraulics and the biokinetics, the biokinetic concentrations within a treatment plant can be spatially resolved with a high resolution.
Highlights
A key step in modern wastewater treatment (WWT) is to biologically treat contaminated water by a sequence of biokinetic processes
Whilst the biokinetics are described in detail by the well-established activated sludge models (ASM) summarized by Henze et al (2000), the reactor hydraulics is coarsely approximated by a series of fully mixed reactors (Levenspiel, 1972)
Model represents a breakthrough in hydrodynamic wastewater treatment (WWT) modelling
Summary
A key step in modern wastewater treatment (WWT) is to biologically treat contaminated water by a sequence of biokinetic processes. A breakthrough in WWT hydraulics, is achieved by the application of computational fluid dynamics (CFD) methods, which allow for the detailed modelling of processes like the settling and transport of solids (Larsen, 1977). Since effects of multiphase flow (Gresch et al, 2011) and biokinetic models (Le Moullec et al, 2010a,b; Wang et al, 2010; Sobremisana et al, 2011) can be incorporated, CFD is a promising tool for wastewater treatment simulations. The wastewater hydraulics are computed with a multi-fluid SPH algorithm, whose accuracy is demonstrated by an analysis of the mixing in WWT-plant basins. Following the description of the method we briefly summarize the biokinetic ASM1 model to specify the coupling to SPH. Following the validation of the model against the software ASIM 5, the capabilities of the present method are demonstrated for a full-scale treatment plant simulation
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