Removal of Silicon from High Level Waste Streams via Ferric Flocculation

PDF Version Also Available for Download.

Description

The presence of silicate from glass-forming frit in the recycle waste from the Defense Waste Processing Facility (DWPF) produces wastes that when combined with the traditional aluminate-bearing wastes stored in Savannah River Site's tank farms can produce insoluble sodium aluminosilicates. Currently, aluminum-bearing wastes and silicon-bearing wastes are processed in separate evaporators. This, however, limits operational flexibility. Therefore, treatment to remove silicon has been proposed to allow greater flexibility for processing these wastes in the Site's evaporators. The use of a ferric precipitation (flocculation) to remove the silicon has been tested using waste simulants. Ferric precipitation following ferric nitrate addition to ... continued below

Physical Description

vp.

Creation Information

Wilmarth, W.R. April 7, 2004.

Context

This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. More information about this article can be viewed below.

Who

People and organizations associated with either the creation of this article or its content.

Sponsor

Publisher

Provided By

UNT Libraries Government Documents Department

Serving as both a federal and a state depository library, the UNT Libraries Government Documents Department maintains millions of items in a variety of formats. The department is a member of the FDLP Content Partnerships Program and an Affiliated Archive of the National Archives.

Contact Us

What

Descriptive information to help identify this article. Follow the links below to find similar items on the Digital Library.

Description

The presence of silicate from glass-forming frit in the recycle waste from the Defense Waste Processing Facility (DWPF) produces wastes that when combined with the traditional aluminate-bearing wastes stored in Savannah River Site's tank farms can produce insoluble sodium aluminosilicates. Currently, aluminum-bearing wastes and silicon-bearing wastes are processed in separate evaporators. This, however, limits operational flexibility. Therefore, treatment to remove silicon has been proposed to allow greater flexibility for processing these wastes in the Site's evaporators. The use of a ferric precipitation (flocculation) to remove the silicon has been tested using waste simulants. Ferric precipitation following ferric nitrate addition to two different alkaline DWPF recycle waste simulants was effective at removing silicon to levels below concern for processing in the any of the Savannah River Site's evaporators. Removal of silicon was rapid with removal complete in 2 hours. Elevated temperatures were tested and found to be not required. Capacities of the resultant iron flocculent were approximately 0.1 g of silicon per gram of iron at a final silicon concentration of 50 mg/L. Moreover, the silicon removal obeys a classical Freundlich adsorption isotherm.

Physical Description

vp.

Source

  • Journal Name: Journal of Separation Science & Technology

Language

Item Type

Identifier

Unique identifying numbers for this article in the Digital Library or other systems.

  • Report No.: WSRC-MS-2003-00759
  • Grant Number: AC09-96SR18500
  • Office of Scientific & Technical Information Report Number: 822825
  • Archival Resource Key: ark:/67531/metadc788241

Collections

This article is part of the following collection of related materials.

Office of Scientific & Technical Information Technical Reports

What responsibilities do I have when using this article?

When

Dates and time periods associated with this article.

Creation Date

  • April 7, 2004

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

Description Last Updated

  • May 5, 2016, 2:34 p.m.

Usage Statistics

When was this article last used?

Yesterday: 0
Past 30 days: 0
Total Uses: 2

Interact With This Article

Here are some suggestions for what to do next.

Start Reading

PDF Version Also Available for Download.

Citations, Rights, Re-Use

Wilmarth, W.R. Removal of Silicon from High Level Waste Streams via Ferric Flocculation, article, April 7, 2004; South Carolina. (digital.library.unt.edu/ark:/67531/metadc788241/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.