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  Environmental Technology Verification Report, Removal of Chemical Contaminants in Drinking Water, EcoWater Systems Incorporated ERO-R450E Drinking Water Treatment System (EPA/600/R-05/122)(56 pp, 1.54 MB) September 2005
Verification Statement (PDF) (6 pp, 180 KB)

The EcoWater Systems ERO-R450E point-of-use drinking water treatment system was tested for removal of aldicarb, benzene, cadmium, carbofuran, cesium, chloroform, dichlorvos, dicrotophos, fenamiphos, mercury, mevinphos, oxamyl, strontium, and strychnine. The ERO-R450E uses a reverse osmosis (RO) membrane and activated carbon filters to treat drinking water. Treated water is stored in a 3.1-gallon storage tank.

The system was first tested with only the RO membrane component in place. The target challenge concentration for each chemical for the RO membrane tests was 1 milligram per liter. Following the RO membrane challenges, the post-membrane carbon filter component was challenged alone with each organic chemical that the RO membrane did not remove to below 30 micrograms per liter.

The carbon filter was also challenged with cesium and mercury because the membranes did not remove these two substances as well as total dissolved solids in general. The target challenge concentration for the carbon filter tests was the maximum effluent level measured during the RO membrane tests.

A total of 20 RO membrane components were divided into ten pairs and tested. Each pair of membranes was tested with only one of the ten organic chemicals because of concern that a chemical could compromise the integrity of the membrane or membrane seals. One pair of RO membrane components was also challenged with the inorganic chemicals.

Each RO membrane chemical challenge was conducted over a one-day period. Influent and effluent samples were collected during the operation period and also the next morning. The post-membrane carbon filter challenges were conducted over a 15-hour duration. Two filters were tested for each chemical challenge, and each pair was used for only one challenge. Influent and effluent samples were collected at the beginning, middle, and end of the challenge period.

Considering both the RO membrane challenge and post-membrane carbon filter challenge results, the ERO-R450E reduced all of the challenge chemicals but cesium by 94 percent or more.


Jeff Adams

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