Complexity of Chloramine Decay Kinetics in Premise Plumbing.

ABSTRACT: Nitrification-driven chloramine decay kinetics have largely been unquantified in premise plumbing, which is particularly vulnerable to opportunistic pathogen growth. Here, we carried out complementary experiments in an at-scale premise plumbing rig with mature biofilms (>4 years age) with influent residuals of <0.2, 0.25, 0.5, 1.0, and 2.5 mg/L as Cl₂ and sterile glass jars, with and without an inoculum containing nitrifying bacteria. Chloramine decay was complete after 8 h of stagnation in all PEX rig pipes (n = 16), tested over a range of diameters (1/4-3/4") and flow rates (0.25-2.2 gpm), with decay rates increasing in situations with higher nitrification rates. The jar experiments revealed that chloramine actually persisted better at higher (37-39 °C) than lower (19-30 °C) t

SUBMITTER: Odimayomi TO 

PROVIDER: S-EPMC12910582 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature