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Integrated Disinfection Byproducts (DBPs) Mixtures Research: DBP Concentration via Reverse Osmosis Membrane Techniques
Citation:
LATHAM, M. AND J. G. PRESSMAN. Integrated Disinfection Byproducts (DBPs) Mixtures Research: DBP Concentration via Reverse Osmosis Membrane Techniques. U.S. Environmental Protection Agency, Washington, DC, EPA/600/F-10/010, 2010.
Impact/Purpose:
To share information
Description:
With the completion of the 4-lab project, the NOM concentration aspect of 4-lab is being continued with renewed focus on creating drinking water relevant freeze-dried NOM isolates that can be used for many drinking water research efforts from DBP investigations to water reuse investigations. The first phase of the project involved developing a new freeze-drying technique to remove the remaining water from the reverse osmosis NOM concentrates. This new technique was optimized to minimize total organic carbon losses through the process. The second phase of the project, currently in progress, involves comparing the freeze-dried and reconstituted NOM to the NOM prior to freeze-drying and concentration in order to demonstrate that the final product is representative of the original natural water. The first recently completed demonstration of this comparison was based on DBP comparisons before and after concentration and freeze-drying. Follow-up work will include other well documented methods for characterizing NOM, such as NMR, elemental analysis, and molecular weight fractionation. The third phase of this project, being conducted concurrently to the second phase, is aimed at concentrating a natural surface water source on a monthly basis for at least a year to build a library representing the NOM from a single water source capturing temporal variations. The concentrated and dried NOM from this source represents a consistent source of NOM that can then be used to research various changes in drinking water treatment and the effects upon DBPs formed. The fourth phase of this project includes moving the NOM concentration equipment to various drinking water relevant water sources and creating a freeze-dried NOM library that can be used for a multitude of drinking water research projects requiring more than one water source to demonstrate the effects of treatment implements.
URLs/Downloads:
INTEGRATED DISINFEC BYPROD (DBPS) MIXTURES RES: DBP CONCEN VIA REVERSE OSMOSIS MEMBRANE TECHFact Sheet (PDF, NA pp, 192 KB, about PDF)