Sodium silicate impacts on lead release in a blended potable water distribution system

    Authors

    P. A. Lintereur; S. J. Duranceau; J. S. Taylor;E. D. Stone

    Comments

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    Abbreviated Journal Title

    Desalin. Water Treat.

    Keywords

    Sodium silicate; Silica; Corrosion inhibitor; Lead release; Lead and; Copper rule; COPPER; Engineering, Chemical; Water Resources

    Abstract

    The effects sodium silicate corrosion inhibitor doses (ranging from 3 to 12 mg/L-SiO(2)) on lead release were investigated during a pilot study Samples were taken from a system of copper loops within a pre-existing pilot drinking water distribution system. The source of lead for the loop system was 50/50 lead/tin coupons. Variations in water quality were implemented through blending differing proportions from 3 different source waters; groundwater, surface water, and desalinated water, and studied in four specific blending phases. The study analyzed both total and dissolved lead release while monitoring several other water quality parameters. A non-linear regression model was developed to describe total lead release in terms of dose and water quality. The model suggested that the dose, temperature, alkalinity, chlorides, and pH had an effect on lead release (R(2) = 0.60). The response of total lead to silicate suggested that increasing dose significantly decreased lead release. Solubility modeling suggested that hydrocerussite would theoretically exist as the predominant lead solid. The solubility model was compared to lead release data from samples that were given months to approach equilibrium.

    Journal Title

    Desalination and Water Treatment

    Volume

    16

    Issue/Number

    1-3

    Publication Date

    1-1-2010

    Document Type

    Article

    Language

    English

    First Page

    427

    Last Page

    438

    WOS Identifier

    WOS:000277008700043

    ISSN

    1944-3994

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