Minimizing biofilm in the presence of iron oxides and humic substances

摘要: Based upon circumstantial evidence linking elevated coliform bacteria counts in drinking water distribution systems with unlined cast iron pipe, it was hypothesized that adsorption of humic substances by oxide containing corrosion products (CPs) can stimulate and/or support biofilm development. Using porous media consisting iron-oxide-coated glass beads (IOCBs) or actual CPs, experiments were performed to evaluate the effectiveness different control and disinfection treatments reducing when carbon source. Free chlorine most effective treatment minimizing biofilm. Addition phosphate alone did not significantly reduce using but there weak IOCBs. The combination free more at than CPs media. presence a major factor considering minimization based on results both types led an increase biomass present, similar conditions could occur system dead-ends. Treatment raise pH 9 media, actually increased experiment under tested.