The U.S. Environmental Protection Agency (EPA) has issued a proposed rule for control of bazardous air pollutants from cellulose manufacturing operations. Both the hydrogen sulfide and carbon disulfide emissions must be controlled. An activated carbon-based process has been developed which effectively removes both of these hazardous compounds with high efficiency. An impregnated activated carbons is used to remove hydrogen sulfide by converting it to sulfur on the interior surface of the activated carbon. The resulting waste is minimal and can be land filled at relatively low cost. A unique type of activated carbon is used to remove the carbon disulfide from the air stream, and periodic regeneration of the carbon, disulfide from the air stream, and periodic regeneration of the carbon, using hot inert gas, recovers the carbon disulfied for reuse. This type of system has operated for several years with no safety problems associated with the low autoignition temperature of carbon disulfide.
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