Title

Impact of carboxylic acid ultrafiltration recycle streams on coagulation

Authors

Authors

C. C. Boyd; S. J. Duranceau;J. Tharamapalan

Comments

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Abbreviated Journal Title

J. Water Supply Res Technol.-Aqua

Keywords

acetic; carboxylic; citric; coagulation; recycle; ultrafiltration; FILTER BACKWASH WATER; SURFACE-WATER; MEMBRANES; ALUMINUM(III); SPECIATION; REMOVAL; ACETATE; OXALATE; ANIONS; Engineering, Civil; Water Resources

Abstract

This research identified unintended consequences of integrating ultrafiltration and its required ancillary cleaning systems within conventional surface water treatment facilities. Carboxylic acids, used in ultrafiltration membrane chemically enhanced backwashes, were demonstrated to interfere with ferric chloride and alum coagulation if recycled into coagulation basins at sufficient acid to coagulant (A/C) molar ratios. Tricarboxylic citric acid and monocarboxylic acetic acid were shown to interfere with conventional coagulation process performance. Significant changes in settled water turbidity, true colour and metal concentrations were observed in jar tests designed to simulate full-scale water treatment plant operations. A threshold A/C molar ratio for coagulation interference was identified for three surface waters in the United States based on sedimentation basin performance goals established by the US Environmental Protection Agency. Citric acid interfered with coagulation at A/C molar ratios as low as 0.028; whereas acetic acid negatively influenced coagulation at A/C molar ratios in excess of 18.0.

Journal Title

Journal of Water Supply Research and Technology-Aqua

Volume

61

Issue/Number

5

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

306

Last Page

318

WOS Identifier

WOS:000308697200005

ISSN

0003-7214

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