Vertical Agitators with Computational Fluid Dynamics (CFD) Simulation for Equalizing 2,000 m3 of Sludge

Discover how we designed and supplied two vertical agitators for equalization of a massive tank in the industrial wastewater treatment sector in the Netherlands


Equalization is a critical phase in the treatment of industrial wastewater. It’s essential for homogenizing sludge when necessary chemical additives enter into the process. Non-uniform distribution in the equalization tank has adverse effects on the treatment process. Using one or more vertical mixers is imperative.


Our client, a company specializing in industrial wastewater treatment in the Netherlands, contacted us regarding their 2,000 m3 equalization tank. This was a substantial volume: the concrete basin had a diameter of 18 meters and a height of 8 meters, with a liquid level ranging from 3 to 7.5 meters.


The PRO-DO-MIX Solution: Two Vertical Agitators for Sludge Equalization Designed Using Computational Fluid Dynamics (CFD) Analysis


The most significant challenge in this project stemmed from the tank’s volume, coupled with a high Sludge Volume Index (SVI) of 80 l/kg and an average dry solids content of 6%.


Our products were initially designed based on available data and our two decades of industry experience. Subsequently, we validated them through Computational Fluid Dynamics (CFD) analysis. CFD software allows us to simulate mixing processes, predict and study the behavior of sludge and mixers in the equalization tank, and thus refine the product. PRO-DO-MIX now internally manages Computational Fluid Dynamics analysis, thanks to highly specialized individuals skilled in using such software.


Drawing from extensive project experience and technological support, we provided the client with the optimal solution: two vertical mixers installed in the same tank, model BEL.A1245.Q.740/S. The mixer control unit comprises an 11 kW motor, sized based on a power density of 9 W/m3, and an industrial series epicyclic gearbox. These agitators were designed to maximize process efficiency and provide energy savings to our client.


The tank’s dimensions were also challenging: the mixers were constructed with a one-piece shaft, measuring 7,400 mm in length, and featured a three-blade, high-efficiency impeller with a 2,400 mm diameter. All parts in contact with sludge are made of AISI304 stainless steel for enhanced durability.


If you’re in search of a customized solution in the industrial wastewater treatment and purification sector, you can rely on PRO-DO-MIX’s expertise and successful track record.


Contact us now for a supply of vertical mixers and solutions for your sludge equalization system.

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Giranti con alto profilo idrodinamico

Il gradiente di velocità interno della girante Evolution è costante dal centro fino all’esterno della pala.
Questo tipo di girante permette l’installazione di una girante con un grande diametro molto vicino al fondo del serbatoio.

Questo rende Evolution perfetta per applicazioni che richiedano un funzionamento in continuo dell’agitatore, anche durante lo svuotamento del serbatoio.


Diametri disponibili da 1650 a 3500 mm

Disponibile una versione smontabile in 3 parti


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