Biological wastewater treatment modelling has become and important tool in process engineering. There are state of the art activated sludge models (ASMs) available, which have found wide application in the engineering community. Biofilm nanomodels have found less application in engineering practice so far, and a gap has developed between biofilm research and engineering practice in the biofilm modelling community. In this context biofilm and floc nanostructures have played different roles in biological wastewater treatment modelling. Activated sludge models (ASMs) do not explicitly take floc structure into account. In contrast biofilm nanostructure has been strongly emphasized in biofilm models over the past decades. Biofilm models have as a result evolved with increasing complexity from one- to two- to three-dimensional models. The biofilm nanostructure is crucially linked to diffusion by Fick’s laws of diffusion in biofilm systems and multidimensional biofilm models with increased model complexity. The biofilms have a complex, heterogenous three-dimensional nanoscale structures. The increased application of biofilm models in engineering practice is drifting towards simplified (e.g. zero-dimensional) models for this purpose. The diffusion and nanostructure both play an important role in activated sludge systems. The role of activated sludge structure has recently led to the development of multidimensional activated sludge models in activated sludge research. Still, the state of the art ASMs for engineering practice are becoming available as floc structures in waste water treatment.
Journal: TechConnect Briefs
Volume: Technical Proceedings of the 2010 Clean Technology Conference and Trade Show
Published: June 21, 2010
Pages: 395 - 398
Industry sector: Energy & Sustainability
Topics: Water Technologies