在挪威的几个原水和处理过的水中测量了生物膜形成的可能性。在其中一些水域中，还测量了溶解有机碳的分子量分布。所研究的去除天然有机物、混凝/分离、膜过滤和离子交换的所有处理工艺都大大降低了生物膜的形成潜力（可生物降解有机碳）。混凝/分离和离子交换降低了可同化有机碳的生物膜形成潜力。膜过滤仅使可同化有机碳的数量略有减少。混凝/分离降低了所有分子量组分中的溶解有机碳。 氯化增加可同化有机碳，但不增加可生物降解有机碳。

The biofilm formation potential was measured in several raw and treated waters in Norway. In some of these waters the molecular weight distribution of the dissolved organic carbon was measured as well. All the treatment processes for removal of natural organic matter investigated, coagulation/separation, membrane filtration and ion exchange, reduce the biofilm formation potential measured as biodegradable organic carbon considerably. Coagulation/separation and ion exchange reduce the biofilm formation potential measured as assimilable organic carbon. Membrane filtration gave only a minor reduction in the amount of assimilable organic carbon. Coagulation/separation reduces the dissolved organic carbon in all molecular weight fractions. Chlorination increases the assimilable organic carbon but not the biodegradable organic carbon.