Title

Influence Of Disinfection On Bacterial Regrowth In Pilot Distribution System

Keywords

Assimilable organic carbon; Biostability; Chloramine; Pilot distribution system

Abstract

A correlation between heterotrophic plate count (HPC) and chloramine residual in pilot distribution systems (PDSs) was investigated. The data was derived from an AWWARF (the Awwa Research Foundation) and Tampa Bay Water tailored collaboration project to determine the effect of blending different waters on distribution system water quality. Seven different finished waters were produced from surface, ground, or simulated brackish water sources on site and fed to 18 independent PDSs, either as a single finished water or as a blend of several finished waters. Significantly higher numbers for PDS HPC were observed below 0.06 mg/L of combined chlorine residual. Changes in assimilable organic carbon (AOC) levels between influent and effluent of the PDSs increased as disinfectant dosage decreased in distribution systems. Significant differences between input and output AOC (ΔAOC) were observed when the chloramine residual was less than 1.0 mg/L, and particularly when less than 0.5 mg/L. High HPC counts often occurred when chloramine residual was less than 0.5 mg/L, regardless of AOC levels or AOC stability. However AOC instability could occur at high influent AOC levels even in the presence of residual greater than 0.5 mg/L, with corresponding high HPC counts.

Publication Date

9-16-2010

Publication Title

Korean Journal of Chemical Engineering

Volume

27

Issue

6

Number of Pages

1860-1863

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1007/s11814-010-0286-4

Socpus ID

84856398490 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84856398490

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