Simultaneous P and N removal in a sequencing batch biofilm reactor: insights from reactor- and microscale investigations

摘要

A sequencing batch biofilm reactor (SBBR) with well established enhanced biological phosphate removal (EBPR) was subjected to higher ammonium concentrations to stimulate and eventually implement simultaneous nitrification. Changes of activity and populations were investigated by a combination of online monitoring, microsensor Measurements and fluorescence in situ hybridisation (FISH) of biofilm sections. Nitrification and nitrifying bacteria Were always restricted to the periodically oxic biofilm surface. Both, activity and population size increased significantly With higher ammonium concentrations.