Title

3-Step approach towards evaluation and elimination of acid use in pre-treatment for a brackish water reverse osmosis process

Authors

Authors

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

Comments

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Abbreviated Journal Title

J. Environ. Manage.

Keywords

Acid elimination; Canary unit; Scale inhibitor; Reverse osmosis; RO; POSTTREATMENT; Environmental Sciences

Abstract

To control carbonate scale formation on reverse osmosis (RO) membrane surfaces, it is common practice to add acid as a pre-treatment chemical. However, advancements in the formulation of proprietary scale inhibitors have resulted in a re-evaluation of the need to suppress the pH of RO feedwater. In this study, a 3-step approach was taken to eliminate sulfuric acid pre-treatment at a 4.5 MGD (17,000 m(3)/day) brackish water RO plant operating for over 7 years without previous membrane replacement. The 3-Step approach adopted in this study to evaluate and eliminate use of acid in pre-treatment process involved first pilot testing the plan to reduce the dependence on acid. Secondly, implementing the plan on the full-scale system with conservative pH increments and thirdly continuously screening for scale formation potential using a "canary" monitoring device. This 3-step approach resulted in the successful elimination of sulfuric acid pre-treatment at the brackish water RO plant, with an estimated $105,000 minimum annual cost savings. (C) 2013 Elsevier Ltd. All rights reserved.

Journal Title

Journal of Environmental Management

Volume

124

Publication Date

1-1-2013

Document Type

Article

Language

English

First Page

115

Last Page

120

WOS Identifier

WOS:000320219700013

ISSN

0301-4797

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