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 Studies to Modify Treatment
 Methods to Reduce Residuals



This project’s objective was to evaluate treatment processes for the disposal of residuals produced by drinking water treatment processes that remove arsenic from groundwater.


This project was conducted to answer question #4.2.3. of the Office of Research and Development’s Research Plan for Arsenic in Drinking Water: How can the residuals from arsenic removal plants be effectively managed?

A laboratory study was conducted to evaluate several treatment processes that reduce the volume or change the form of the residuals from existing arsenic removal water treatment systems. The residuals included in the study were those associated with ion exchange, activated alumina, reverse osmosis, nanofiltration, and iron/manganese removal processes.

Information from this project supports the selection of the Best Available Technologies for the revised arsenic Maximum Contamination Level regulation and is used by EPA to provide guidance to the water utility industry on residual disposal options and residual disposal costs.

Project Status

The laboratory study has been completed and a Final report has been published: Treatment of Arsenic Residuals From Drinking Water Removal Processes (PDF) (96 pp, 1.14 MB) (EPA 600/R-01/033) June 2001 – Abstract

Based on laboratory results, the approach has been incorporated into the small systems research currently under way.



Date Research Started

January 1999

Completion Date

June 2001

Date of Last Update

February 2002


Tom Sorg

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