Abstract
In continuous flow biofilm reactors (CFBR) stratification of the microbial community may develop in the direction of flow. Problems arise when substrate is transported into regions where the population size of the required species such as nitrifiers is underdeveloped. Results of experimental studies support this assumption. Equalisation of the species distribution appears to be necessary to maintain reasonable reactor performance under shock loading conditions. Uniform population size and species distribution was achieved in a sequencing batch biofilm reactor (SBBR), which provided positive results, and stratification of hetero‐trophs and nitrifiers was eliminated. Equalisation of the population size of heterotrophs was less effective because of the apparent acclimatisation potential of the bacteria.
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