Iodinated disinfection byproduct formation in a MnO2/I−/EPS system

Manganese dioxide (MnO2) is a Mn deposit widely accumulated in the corrosion layer of pipelines, and iodide (I−) halogen ion frequently detected waters. The biofilm dwelling on scales often secretes extracellular polymeric substances (EPS) into drinking water. paper aimed to study I− oxidation by MnO2 iodinated disinfection byproducts (I-DBPs) formation with EPS as precursor. More than 93% formed free iodine was finally converted organic MnO2/I−/EPS system. Compared humic acid, had lower carbonaceous I-DBPs (C-IDBPs) while higher nitrogenous (N-IDBPs) formation. iodomethanes (I-THMs), iodoacetonitriles (I-HANs) iodoacetic acids (I-HAAs) decreased increase pH due weakening polarization effect redox potential, iodoacetamides (I-HAcAms) achieved maximum at 6.0 difference between hydrolysis rate I-HANs decomposition I-HAcAms. positively correlated concentration, negatively dose. Protein components displayed N-IDBPs C-IDBPs polysaccharide nitrogen proportion more iodination sites. Among 20 protein monomers, aspartic acid considered most important precursor four investigated species. helpful understand when bulk water come contact deposits attached biofilm.