Title

Influence of disinfection on bacterial regrowth in pilot distribution system

Authors

Authors

Y. C. Chang; A. A. Randall; O. Choi; D. Choi; H. Cho;S. Kikuchi

Comments

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Abbreviated Journal Title

Korean J. Chem. Eng.

Keywords

Assimilable Organic Carbon; Biostability; Chloramine; Pilot Distribution; System; WATER DISTRIBUTION-SYSTEMS; ASSIMILABLE ORGANIC-CARBON; HETEROTROPHIC; BACTERIA; BIOFILMS; CHLORAMINATION; CHLORINE; IMPACT; IRON; AOC; Chemistry, Multidisciplinary; Engineering, Chemical

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 (Delta AOC) 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.

Journal Title

Korean Journal of Chemical Engineering

Volume

27

Issue/Number

6

Publication Date

1-1-2010

Document Type

Article

Language

English

First Page

1860

Last Page

1863

WOS Identifier

WOS:000283837100037

ISSN

0256-1115

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