Title

Optimized coagulation assessment for a highly organic surface water supply

Authors

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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