Influence of disinfection on bacterial regrowth in pilot distribution system

    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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