Disposal Of Waste Resulting From Arsenic Removal Processes

There are a number of treatment techniques that can effectively remove arsenic from drinking water. It is essential for utilities that are in the process of selecting an arsenic removal treatment technology to also identify the types of residuals that would be generated, their expected arsenic concentrations, and pre-treatment strategies that would be required prior to final disposal. This document provides utility guidelines for disposal of residuals containing elevated concentrations of arsenic.Originally published by AwwaRF for its subscribers in 2003 This publication can be purchased and downloaded via Pay Per View on Water Intelligence Online - click on the Pay Per View icon below

The reduced drinking water arsenic MCL of 10 micro grams per litre will require many utilities to remove more arsenic from their source water, thereby concentrating it in their residuals. Because arsenic removal is sensitive to both the pH and the oxidation state, any process that changes pH or results in a reducing environment may release arsenic from the solid phase. Management of arsenic-laden residuals is an important issue due to the potential re-release of arsenic into the environment. This report identifies factors that influence arsenic release and provides a decision tree for use by utilities with arsenic-laden residuals.

The book provides state-of-the-art information on removal, recovery, treatment, and disposal of mercury and arsenic wastes, based on a workshop held in Alexandria, Virginia in August 1992. The goals of the workshop were: 1) to examine the fundamentals and analytical issues related to mercury and arsenic compounds; 2) to disseminate information on the state of practice of source reductiontechnologies that recover or remove mercury and arsenic from industrial wastes'and recycling or reuse processes; and 3) to discuss existing and emerging technologies that treat industrial wastes or contaminated soil and water, and the storage and disposal of treated wastes. The book is presented in two parts Mercury and Arsenic and contains extended summaries of papers presented at the workshop. The areas covered are fundamentals, analytical techniques/characterization; removal, recovery, and reuse; and treatment, storage, and disposal.

Provides experimental research: a review of stabilization, arsenic chemistry, & treatment; experimental methods & procedures; & a description of the experimental design & results. Research was conducted to understand & develop this promising stabilization process. Contains 90 tables & figures.