Water quality profiles during nitrification in a pilot distribution system study

    Authors

    S. B. Liu; J. S. Taylor;D. Webb

    Comments

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    Abbreviated Journal Title

    J. Water Supply Res Technol.-Aqua

    Keywords

    chloramine; distribution system; drinking water; nitrification; pipe; material; water quality; CHLORAMINATED DISTRIBUTION-SYSTEMS; DRINKING-WATER; DISINFECTION; CHLORINE; BACTERIA; NITRITE; Engineering, Civil; Water Resources

    Abstract

    Biochemical nitrification was investigated in a large scale pilot study using aged galvanized steel, unlined cast iron and a hybrid pilot distribution systems consisting of a combination of aged unlined cast iron and galvanized steel pipes. Variations of free polyvinyl chloride lined cast iron,, ammonia, nitrate, nitrite, dissolved oxygen (DO) and chloramine residual in the distribution system water are discussed for each pipe material. Chloramine depletion, Do depletion, free ammonia release, heterotrophic plate count (HPC) growth, NO2-N and NOx-N measured as the sum of nitrite and nitrate N were dependent on pipe material. Galvanized steel pipe had the highest chlorine demand and produced conditions without residuals, which corresponded to the higher HPC proliferation and DO consumption and the lowest nitrification. The greatest production of nitrite and nitrate was observed in unlined cast iron pipe. Denitrification was observed in the unlined cast iron pilot distribution system following residual loss and development of anoxic conditions.

    Journal Title

    Journal of Water Supply Research and Technology-Aqua

    Volume

    54

    Issue/Number

    3

    Publication Date

    1-1-2005

    Document Type

    Article

    Language

    English

    First Page

    133

    Last Page

    145

    WOS Identifier

    WOS:000230049900001

    ISSN

    0003-7214

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