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US 5,683,587 AGranted
Process for treating industrial wastes
OwnerMarcello Ferrara, Maria Gabriella Scopellitiinventors
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Abstract
Water to be utilized is reacted with soda ash and lime to produce a less corrosive and foulant water. Reaction sludges are fed to a desulfurization unit, where SO.sub.x, NO.sub.x and CO.sub.2 abatement occurs; other industrial waste sludges and/or waters and/or gases can also be utilized in such connection. FIG. 1 is one of the possible process schemes of the present invention.
Claims19
A process for treating wastes comprising the steps of:
- producing a waste sludge containing calcium carbonate and magnesium hydroxide by reaction of soda ash and lime with process water;
- feeding a hot waste gas at a temperature of from about 200.degree. C. to 1000.degree. C. containing 50 to 50000 ppm of pollutants selected from the group consisting of SO.sub.x, NO.sub.x and CO.sub.2 to a scrubber apparatus containing an adsorbent slurry comprising said waste sludge for removing SO.sub.x, NO.sub.x and CO.sub.2 ;
- separating the waste sludge to obtain a dry sludge;
- injecting the dry sludge into a reaction chamber;
- reacting a gaseous stream containing said pollutants in the reaction chamber with said dry sludge to substantially reduce sulfur oxide compounds and nitrogen oxides in said reaction chamber.
2 more elements
A method for treating wastes comprising the steps of:
- producing a waste sludge containing calcium carbonate and magnesium hydroxide by reaction of soda ash and lime with process water;
- feeding the waste sludge to a scrubber with a waste gas mixture containing gaseous pollutants where said gaseous pollutants are in a mixture comprising 50 ppm to 50000 ppm each of SO.sub.x, NO.sub.x and CO.sub.2 ;
- separating the waste sludge to obtain a dry sludge;
- injecting the dry sludge into a reaction chamber;
- reacting a gaseous stream containing said gaseous pollutants in the reaction chamber with said sludge to substantially reduce sulfur oxide compounds and nitrogen oxides in said reaction chamber.
2 more elements
Dependencies are inferred from the claim text.