Optimized coagulation assessment for a highly organic surface water supply

    Authors

    W. A. Lovins; S. J. Duranceau; R. M. Gonzalez;J. S. Taylor

    Comments

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    Abbreviated Journal Title

    J. Am. Water Work Assoc.

    Keywords

    ENHANCED COAGULATION; Engineering, Civil; Water Resources

    Abstract

    Jar-test experiments were used to study optimized coagulation for removal of nonpurgeable dissolved organic carbon (NPDOC), color, and turbidity for highly organic surface water. The coagulants alum, polyaluminum chloride, ferric sulfate, and ferric chloride were capable of meeting the required Stop 150% total organic carbon removal criteria. Disinfection by-product precursor removal was a function of coagulant type, coagulant dose, and flocculation pH. Iron-based coagulants were capable of 10% higher NPDOC removal than aluminum-based coagulants. However, aluminum-based coagulants generally provided higher color removal. Based on treatment performance, cost, and other factors, sulfate-based coagulants-alum and ferric sulfate-were the overall coagulants of choice for this water. Additional testing with alum and ferric sulfate demonstrated the benefit of optimizing rapid and slow mix conditions, polymer selection, and solids addition for enhanced turbidity removal. The benefits of impounding raw river water in a surface water reservoir before treatment were also identified.

    Journal Title

    Journal American Water Works Association

    Volume

    95

    Issue/Number

    10

    Publication Date

    1-1-2003

    Document Type

    Article

    Language

    English

    First Page

    94

    Last Page

    108

    WOS Identifier

    WOS:000186100300012

    ISSN

    0003-150X

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