Hydraulic and earth engineering – Subterranean waste disposal – containment – or treatment – With treatment of waste
Patent
1986-06-16
1988-02-23
Corbin, David H.
Hydraulic and earth engineering
Subterranean waste disposal, containment, or treatment
With treatment of waste
106DIG1, 210751, 405263, C04B 1806
Patent
active
047267100
ABSTRACT:
Process for disposal of fossil fuel ash by addition thereto of sodium salts, preferably sodium sulfur oxide salt Na.sub.2 SO.sub.x where x is 3 and/or 4, in an amount ranging from 5-85 weight percent (dry basis) and adjusting the water percentage to within the range of 6-35%, preferably 15-28%. The coefficient of permeability of the ash and sodium salt is reduced from 10.sup.2 cm/sec to the "impermeable" standard of 10.sup.-6 and below. The preferred mixes also call for a smectite clay additive present in the range of from 0.1% to 5%. A flocculant in amounts of 0.01% to 1% can be substituted for about 3-5% of the water content. A principal source of the Na.sub.2 SO.sub.x is sodium FGD waste, preferably from the use of Nahcolite (a natural mineral form of sodium bicarbonate) as an SO.sub.x sorbent in the Nahcolite FGD process. The resulting co-disposal process simultaneously renders the highly soluble Na.sub.2 SO.sub.x (10.sup.2 g/L) and ash impermeable, and suitable for geomorphologically stable landfill disposal by known techniques to heights in excess of 200'.
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Pattengill Maurice G.
Rosar Edward C.
Corbin David H.
Dulin Jacques M.
Industrial Resources, Inc.
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