NJIT eTD::njit-etd1996-018::Moerman, Erik::"Advanced characterization and leaching behavior of hexavalent and trivalent chromium from waste material"

In this thesis we employed advanced characterization techniques such as XRF, XRD, XPS, SEM, and EDS to provide detailed information about the chromium waste _ specifically chromium valence states (Cr(VI) and Cr(III)), and their chemical association with other phases in the waste matrix.

The removal of Cr(VI) was accomplished by leaching with aqueous solutions containing inorganic anions such as Cl^-, SO₄^2-, PO₄^3- and others. Cr(VI) can be released from the waste by a combination of desorption and ion exchange processes. The efficiency and kinetics of displacing CrO₄^2- from the waste by anions was extensively studied.

Cr(Ill) removal was achieved by the oxidative dissolution process - i.e., by using different oxidants at various pH conditions. We defined the mechanisms for Cr(III) transformation to Cr(VI) and the leaching of the latter into the environment under different pH conditions. We assessed the conditions and rate for such conversion and leaching processes.

Title:	Advanced characterization and leaching behavior of hexavalent and trivalent chromium from waste material
Author:	Moerman, Erik
Document Type:	Thesis
Department:	Department of Civil and Environmental Engineering
Degree:	Master of Science
Major:	Environmental Engineering
Advisory Committee:	Labib, Mohamed E. Spillers, William R. Raghu, Dorairaja
Thesis Date:	1996, May
Keywords:	Chromium--Toxicology Chromium--Environmental aspects
Availability:	Unrestricted
Abstract:	In this thesis we employed advanced characterization techniques such as XRF, XRD, XPS, SEM, and EDS to provide detailed information about the chromium waste _ specifically chromium valence states (Cr(VI) and Cr(III)), and their chemical association with other phases in the waste matrix. The removal of Cr(VI) was accomplished by leaching with aqueous solutions containing inorganic anions such as Cl^-, SO₄^2-, PO₄^3- and others. Cr(VI) can be released from the waste by a combination of desorption and ion exchange processes. The efficiency and kinetics of displacing CrO₄^2- from the waste by anions was extensively studied. Cr(Ill) removal was achieved by the oxidative dissolution process - i.e., by using different oxidants at various pH conditions. We defined the mechanisms for Cr(III) transformation to Cr(VI) and the leaching of the latter into the environment under different pH conditions. We assessed the conditions and rate for such conversion and leaching processes.
Complete Thesis:	njit-etd1996-018 (113 pages ~ 7,039 KB pdf)
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