Use of CFD to improve wastewater treatment plants

Pöyry is an international consulting and engineering company that serves clients globally in the energy and industrial sectors. Pöyry being a “connected company”, applies Computational Fluid Dynamics as a tool to solve complex engineering problems that tangent a broad spectrum of its engineering services worldwide. Current presentation is focused on waste water treatment plants and the way how various issues are analyzed and resolved using CFD.  

The first example is that of optimizing  the flow behavior at the entrance of the plant. 3-D free surface multiphase CFD simulations were conducted to compare different geometrical measures in order to evenly distribute the wastewater to the three parallel operating screening units. In light of the CFD results a specifically designed flow diverting structure was installed upstream to the parallel screening units. This structure evenly distributed the waste water flow towards the screening units hence avoiding a damage to the downstream screening units as well as improving the overall efficiency of the system.

The second example of wastewater treatment plants is subjected to numerical investigations of agitation basins. Pöyry helped the client to investigate the mixing behaviour of waste water in the agitation basins by means of numerical simulations to provide a proof of the working efficiency of the planned mixers within the basins. The problem could be solved by using single phase flow conditions with moving meshes.

The third example of the wastewater treatment plant investigated by numerical simulations involved multiphase flow in a sedimentation tank. The main challenge not only involved the in-depth know how in the field of waste water treatment but also demanded the sound application of numerical models for the complex behavior of the settling solid wastes within the sedimentation tank. The numerical modelling was conducted using a 3-D Eulerian multiphase CFD model. The model considered the viscosity variation as a function of deposition/change in solid concentration and the coagulation process leading to a change in particle size that had a direct influence on the settling behavior of the solid waste.  

The “connected company” concept of Pöyry allowed a successful completion of the above mentioned projects as it involved engineering and simulation experts from different engineering departments.  Using the simulation, analysis and post-processing capabilities of  STAR-CCM+® the engineering team managed to successfully complete the projects in an efficient and productive manner.

Pöyry Switzerland
Erwin Eichelberger
Pöyry Switzerland
Rehan Yousaf
Session Time Slot(s): 
06/03/2017 - 2:25pm-06/03/2017 - 2:50pm
Room I
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Session Track: 

Session Tracks (STAR Global Conference 2017)