Abstract: Method and apparatus for processing hazardous waste by incinerating the hazardous waste to a temperature sufficient to break down the hazardous waste; directing at least a portion of the exhaust gas stream produced by the incineration through a spray dryer; passing all of the gas stream from the incineration including that portion exiting the spray dryer through a scrubbing and absorbing device to remove particulates and acid gas from the gas stream by contacting the gas stream with a scrubbing and acid gas absorbing slurry or solution; separating a portion of the scrubbing and acid gas slurry or solution after contact with the gas stream as a waste liquor; and spraying the waste liquor into the exhaust gas stream passing through the spray dryer to evaporate the water in the waste liquor and produce a dry residue.

Abstract: A method of regenerating a scrubbing solution containing sodium sulfite, sodium bisulfite, sodium sulfate and sometimes sodium hydroxide circulated in scrubbers to remove sulfur oxides from gas streams where sodium sulfite is converted to sodium bisulfite as sulfur dioxide is absorbed in the scrubbing solution. A portion of the circulating scrubbing solution is bled off for regeneration and reacted with calcium oxide in pebble lime while the pebble lime is impinged against an impingement surface at a velocity of at least 8-10 feet per second to convert the sodium bisulfite back to sodium sulfite and form calcium sulfite precipitate. The calcium sulfite is removed from the regenerated scrubbing solution and the regenerated scrubbing solution returned to the circulating scrubbing solution in the scrubbers.

Abstract: Gas scrubbing apparatus for removing sulfur dioxide from a gas stream with a cleaning liquid capable of absorbing the sulfur dioxide in the gas stream comprising a housing defining scrubbing chamber therein, a plurality of baffles in the scrubbing chamber at longitudinally spaced positions therealong for generating turbulence in the gas stream and rotating the gas stream about the central axis of the scrubbing chamber, spray means for spraying the cleaning liquid into the scrubbing chamber between the baffles to absorb the sulfur dioxide from the gas stream, and a mist eliminator downstream of the baffles to remove liquid droplets from the gas stream. The baffles are oriented so that each baffle rotates the gas stream approximately ninety degrees about the central axis of the scrubbing chamber as the gas stream flows thereby with all of the baffles rotating the gas stream in the same direction about said central axis.

Abstract: A filtration device and method for removing particulate matter entrained in a gas stream including a filter media with a first prescribed surface area on one side thereof; a perforated support for positioning the filter media so that one side thereof is in communication with the gas stream with the particulate matter entrained therein; a suction head defining a suction inlet therein with a second prescribed cross-sectional area smaller than the first prescribed surface area of the filter media on that side of said filter media opposite the side in communication with the gas stream; a fan for forcing the gas stream into the suction head through the filter media to separate the particulate matter from the gas stream; and drive means for moving the suction head along the filter media so that substantially all of the filter media is eventually used.

Abstract: A rectangular section venturi scrubber has a double diamond, rectangular insert adjustably mounted therein with the parts proportioned to form diverging, restricted scrubbing throats of substantial length and of constant cross sectional area along their length. Water is introduced into the venturi for collecting dust in gases flowing through the scrubber.

Abstract: In a system for removing sulfur oxides from flue gas, the gas is contacted by a primary extraction solution containing sodium sulfite as the active compound and some sodium bisulfite in a scrubber, and the resultant extract containing more sodium bisulfite is mixed with an alkaline solution containing regenerated sodium sulfite in a mixer to produce the primary extraction solution. A portion of the latter is bled off to a regenerator wherein the quantity of sodium bisulfite made in the scrubber reacts with calcium hydroxide to form regenerated sodium sulfite and large diameter calcium sulfite precipitates that remain suspended in the parent solution. This mixture is drawn off the regenerator by overflow, without pumping, for gravity flow to the eye of a thickener, wherein an increased density slurry of the mixture is withdrawn from the thickener well and directed to a rotary filter to produce a calcium sulfite filter cake.