Apparatus for the separation of undesirable constituents from a waste gas

Apparatus for the separation of undesirable constituents from a waste gas, comprising means defining a vertical bed of adsorbent having an upper end and a lower end, means for supplying adsorbent to the upper end and for removing adsorbent from the lower end, said supplying means comprising a grid comprised by a plurality of feed hoppers arranged in side-by-side relationship and one behind the other, said feed hoppers having spaces therebetween and being positioned to deliver adsorbent onto an exposed uppermost surface of said bed, and means for supplying waste gas to said spaces between said hoppers and thence to said uppermost surface of said bed to pass downwardly through said uppermost surface and through said bed and thereafter leave said bed, and means for removing waste gas that has passed through said bed.