One-dimensional biofilm models have been demonstrated accurate for modeling specific types of biofilm reactors; in particular those using free-moving submerged biofilm carriers (Xcarrier). Biofilm reactors containing Xcarrier are presently the most widely applied biofilm-based system for municipal and industrial wastewater treatment. This paper presents a new sub-model that describes the migration of Xcarrier and associated biofilms, and evaluates the impact that Xcarrier migration and axial dispersion has on simulated system performance. Relevance of the new biofilm reactor model to engineering situations is discussed by applying it to known biofilm reactor types and operational conditions.
- First received 19 December 2016.
- Accepted in revised form 2 March 2017.
- © IWA Publishing 2017