Anaerobic digestion CFD simulations for optimal mixing

Anaerobic digester design optimisation using Computational Fluid Dynamics (CFD) accounting for sludge rheology and viscosity. Dead zones and mixing optimisation (impeller type and reactor).

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Questions we answer with CFD

For various customers across the world we simulate anaerobic digestion systems to answer operational and design questions such as:

How do we configure the mixers, and which types?
Can we optimise the reactor design?
Can you analyse our current systems? (in case of mixing problems)

The solutions we offer

We then use the CFD model to test different system improvements on the computer. This is much easier and less risky compared to real-scale testing. We troubleshoot the design and operation and suggest system improvements based on our outcomes.

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Very realistic CFD models

We account for the high viscosity and so-called 'non-newtonian' behaviour of digesters.
Recirculation loops, mixing, real geometries, ... are taken into account

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Suggested Projects

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Softening

Optimal design of pellet softening reactors

Optimal design of pellet softening reactors using computational fluid dynamics (CFD). Optimal CaOH (calcium hydroxide; lime) dosing. Equal fluidization. Smaller reactor size, optimal pellet size distribution, avoid shortcircuiting.

Chemical dosing

Optimal coagulant dosing in primary treatment of WWTP Auckland, New Zealand

Coagulant dosing in primary sedimentation tanks and grit tanks was optimised using computational fluid dynamics (CFD). Watercare's wastewater treatment plant (WWTP) of Auckland, New Zealand was retrofitted. Mixing and flow distribution.

A-Stage

Optimal inlet and outlet design was critical for process performance

This novel A-stage process was designed using computational fluid dynamics (CFD). Inlet and outlet pipes were designed, optimal sludge blanket fluidization, primary sludge solids wash out prevented.

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