Science Inventory

Coupling reverse osmosis with electrodialysis to isolate natural organic matter from fresh waters

Citation:

KOPRIVNJAK, J. F., E. M. PERDUE, AND P. H. PFROMM. Coupling reverse osmosis with electrodialysis to isolate natural organic matter from fresh waters . WATER RESEARCH. Elsevier Science Ltd, New York, NY, 40(18):3385-3392, (2006).

Impact/Purpose:

information

Description:

This study was undertaken to solve the problem of removal of sulfate and silica from solutions of natural organic matter (NOM) that have been pre-concentrated by reverse osmosis. The goal is the development of a method by which NOM can be concentrated and desalted to obtain a low-ash, freeze-dried solid material. Current practice yields solutions that, upon desalting and freeze-drying, yield NOM containing finely dispersed sulfuric acid and silicic acid. These acids will contribute to the apparent carboxylic and phenolic contents of NOM, leading to an overestimation of both. NOM may also be chemically altered by sulfuric acid, which reacts strongly with many classes of organic compounds. The sulfur content and ash content of NOM will be elevated in the presence of sulfuric acid and silicic acid. This study evaluates electrodialysis as a method for removal of sulfate and silica from concentrated synthetic river and concentrated (by reverse osmosis) river waters. Under optimal operating conditions, both sulfate and silica can be largely removed without any significant loss of NOM. The electrodialysis process is sufficiently mild that the NOM is not altered by chemical or physical conditions.

URLs/Downloads:

URL.PDF   (PDF,NA pp, 22 KB,  about PDF)

Coupling reverse osmosis with electrodialysis to isolate natural organic matter from fresh waters    Exit

Record Details:

Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Product Published Date: 10/01/2006
Record Last Revised: 02/26/2009
OMB Category: Other
Record ID: 151088

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL RISK MANAGEMENT RESEARCH LABORATORY

WATER SUPPLY AND WATER RESOURCES DIVISION

TREATMENT TECHNOLOGY EVALUATION BRANCH