초록 ▼

In wastewater treatment plants it is conventional to use gas “scrubbers”to remove hydrogen-sulfide gas from digester gas. The reactive scrubbing medium in such digester-gas scrubber vessels is generally iron-oxide “sponge,”which is exhausted in use and which is both difficult and dangerous to regene

In wastewater treatment plants it is conventional to use gas “scrubbers”to remove hydrogen-sulfide gas from digester gas. The reactive scrubbing medium in such digester-gas scrubber vessels is generally iron-oxide “sponge,”which is exhausted in use and which is both difficult and dangerous to regenerate. In accordance with the present invention, the spent iron-oxide sponge is immersed in liquid－by filling the scrubber vessel with the liquid－and a regenerating gas is then bubbled through the liquid and the iron-oxide sponge together. The liquid may be water, and the regenerating gas may be air or pure oxygen. The liquid absorbs heat from the regeneration reaction and conducts it out of the iron-oxide medium, eliminating the danger of combustion or explosion without impeding the progress of the reaction. The regenerating gas is applied through a diffuser structure from below. When regeneration is complete the liquid is drained from the vessel, but the flow of gas may be continued until the iron-oxide medium is dry. Scrubber operation may then resume.

대표청구항 ▼

A method of regenerating and reusing a hydrated-ferric-oxide medium comprising hydrated ferric oxide bound to a substrate, that has been used to extract hydrogen-sulfide gas from digester gas by forming with the hydrogen-sulfide gas ferric sulfide that is bound to residual medium, comprising the ste

A method of regenerating and reusing a hydrated-ferric-oxide medium comprising hydrated ferric oxide bound to a substrate, that has been used to extract hydrogen-sulfide gas from digester gas by forming with the hydrogen-sulfide gas ferric sulfide that is bound to residual medium, comprising the steps of: immersing the ferric sulfide and residual medium together in a liquid comprising water; then bubbling through the liquid a regenerating gas that reacts with the ferric sulfide while the ferric sulfide remains bound to residual medium, dissociating the ferric sulfide to restore the hydrated ferric oxide, bound to the substrate, on the medium; whereby the reaction of the generating gas with the ferric sulfide requires no supervision; and then removing the liquid from the hydrated ferric oxide; whereby the hydrated ferric oxide, still bound to the substrate, may then be reexposed to further quantities of the digester gas, to extract further quantities of the hydrogen-sulfide gas therefrom.