Simulation of a UASB reactor
2011 (English)Article in journal (Other academic) Submitted
A model has been developed to describe the behaviour of a UASB reactor with respect to substrate degradation, microorganism growth and granule size. The model is transient and includes advection, dispersion, and reaction terms. It also considers microorganism decay and the fraction of the biomass that can be dragged by the effluent. A mass balance was established in order to obtain an expression for the rate of the reaction occurring in the granule. It takes into account the resistance due to the mass transport through the stagnant film around the granule, the intra-particle diffusion, and the degradation rate within the granule.
The model was solved using COMSOL Multiphysics software and data from the literature were used to study the performance of the model. The agreement between the model and the experimental results was satisfactory. The majority of the substrate is degraded at the bottom of the reactor due to the high density of granules present in that region. This kind of simulation may be a very helpful tool in the development and improvement of UASB reactors by predicting the reactor performance under different operating conditions.
Place, publisher, year, edition, pages
modelling, UASB, granules, wastewater, anaerobic treatment
Other Basic Medicine
IdentifiersURN: urn:nbn:se:kth:diva-29520OAI: oai:DiVA.org:kth-29520DiVA: diva2:394735
QS 201203162011-02-032011-02-032012-03-16Bibliographically approved