The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Stabilization/solidification of organic containing wastes using organophilic clay and coal fly ash
Author:	Lagoutte, Edith
View Online:	njit-etd1990-037 (viii, 100 pages ~ 2.8 MB pdf)
Department:	Department of Chemical Engineering, Chemistry and Environmental Science
Degree:	Master of Science
Program:	Environmental Science
Document Type:	Thesis
Advisory Committee:	Knox, Dana E. (Committee chair) Liskowitz, John W. (Committee member) Grow, James M. (Committee member)
Date:	1990-12
Keywords:	Sewage sludge digestion Fly ash Bentonite
Availability:	Unrestricted
Abstract:	The relative merits of eight different coal fly ashes for use in the stabilization/Solidification of a waste containing both heavy metals and pentachlorophenol were investigated. Also studied, was the possible use of either untreated or treated (with hexade-cyl ammonium bromide) clay to enhance the stabilization of the organic. The sample composition was : 62% foundry baghouse dust (or 60% if 2% clay as added to the sample), 4.5% cement, 14% coal fly ash, 19.5% water. Pentachlorophenol was chosen as representative of the organic contamination. All tests were performed after curing the samples at 22°C, 98% Rh for 28 days. The tests consisted of: water content, true density, bulk density, unconfined compressive strength, porosity, and the Toxic Characteristic Leaching Procedure Test (TCLP). The results showed promising results, based on the physical resistance of the samples and the reduction of the concentration of chromium, lead and cadmium in the leachate. However, after 28 days curing, no differences in the physical or chemical proper-ties could be observed amoung S/S samples made with different fly ashes. Physical tests show an average true density of 2.3, and a strength resistance of about 300 psi. The resitance to the wet/dry testing was excellent, as samples had lost less than 1% corrected cumulative weight loss. However, the resistance to freeze/thaw cycles was not as satisfactory. A comparison of the results obtained after 28 days, between the untreated and treated clay show that the use of treated clay can enhance the strength and weathering resistance of the cubes. It also reduces the PCP concentration in the leachate by a factor of 10.