Multiscale hydrodynamic investigation to intensify the biogas production in upflow anaerobic reactors

- Hydrodynamics plays a major role in improving the performance of upflow reactors.
- Gas > solid > liquid can be ordered as for the circulation velocity.
- Motion between bubbles and liquid is the key parameter affecting the shear rates.
- Shear rate exerted on a sludge granule displays an optimum biogas production rate.