Vitrification of Chromium Electroplating Sludge

This work investigated the vitrification of hazardous electroplating sludge containing 140 mg/g Cr with/without bottom ash or cullet conditioning to lower specimens' basicities to 0.97−1.17 or 0.18−0.23, respectively. The conditioning was found to enhance the smooth/glassy appearance of slags b...

Full description

Saved in:
Bibliographic Details
Published in:Environmental science & technology 2007-04, Vol.41 (8), p.2950-2956
Main Authors: Li, Chun-Teh, Lee, Wen-Jhy, Huang, Kuo-Lin, Fu, Sheng-Feng, Lai, Yi-Chieh
Format: Article
Language:English
Subjects:
Applied sciences
Chromium
Chromium - chemistry
Electroplating
Environmental engineering
Exact sciences and technology
Incineration - methods
Other industrial wastes. Sewage sludge
Plating
Pollution
Ratios
Refuse Disposal - methods
Slag
Sludge
Wastes
Water treatment
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This work investigated the vitrification of hazardous electroplating sludge containing 140 mg/g Cr with/without bottom ash or cullet conditioning to lower specimens' basicities to 0.97−1.17 or 0.18−0.23, respectively. The conditioning was found to enhance the smooth/glassy appearance of slags but no ingot was obtained. Cr was >98% retained in the vitrified slags. Cr2O3 dominated in crystalline structure for the slag vitrified from the sludge, but this domination gradually shifted to Fe2SiO4/Fe3O4/SiO2 or SiO2 crystalline with increasing addition of bottom ash or cullet into the sludge, respectively. Compared to the raw sludge, the sludge-vitrified slag displayed lower leaching concentrations for most metals (particularly Cr (2.54 mg/L)), and smaller leaching ratios for Ag, Cr, and Cu (1.35, 0.02, and 14.7 MPa at the mixing ratios ≥2/1 and 1/1 for bottom ash/sludge and cullet/sludge, respectively. Fulfilling the criteria of Toxicity Characteristic Leaching Procedure (TCLP), all the slags were recyclable.
ISSN:0013-936X
1520-5851
DOI:10.1021/es062803d