Properties of stabilized FGD sludge
A laboratory test program was conducted to study the effects of three stabilization techniques on the geotechnical properties of thixotropic FGD sludges. The techniques studied were: blending, i.e., mixing settled, dewatered sludge with fly ash; fixation, i.e., addition of CaO; and forced oxidation, i.e., conversion of CaSO/sub 3/ to CaSO/sub 4/ which changes the crystalline structure of the sludge. For a given mixture of constituents, a particular moisture content was required to achieve maximum density. Curing of both fixated and blended sludges for 7-28 days considerably improved their strength properties, i.e., reduced their permeabilities and increased their Unconfined Compressed Strengths and California Bearing Ratios. Oxidized sludges consisting mainly of CaSO/sub 4/ exhibited the best strength properties. The superiority of fixated oxidized sludges could permit a considerable reduction in the amount of lime needed to form a transportable and disposable end-product.
- Research Organization:
- Res.-Cottrell Inc.
- OSTI ID:
- 6887482
- Report Number(s):
- CONF-780636-
- Journal Information:
- Proc., Annu. Meet., Air Pollut. Control Assoc.; (United States), Journal Name: Proc., Annu. Meet., Air Pollut. Control Assoc.; (United States) Vol. 78-57.3; ISSN PRAPA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Options for treating and disposing of FGD scrubber sludge
Air pollution cleaning wastes: dry versus wet