There are provided methods for treating a gas having an undesirable odor. The methods comprise contacting the gas with an acidic aqueous oxidizing composition having a pH of about 2.0 to about 3.0 and comprising at least one cation of a metal; a sequestering agent; and H.sub.2O.sub.2 and submitting the gas and the composition to UV radiation when the gas and the composition are contacting each other, wherein the treatment permits to reduce by at least 60% intensity of the undesirable odor.

A process for carbon mineralization of petroleum refinery solid waste material includes providing an aluminum (Al)-containing industrial solid waste generated within a petroleum refinery, a carbon dioxide (CO.sub.2) containing stream, and an alkali base to a mineralization reactor. The petroleum refinery solid waste material includes the aluminum-containing industrial solid waste. The process also includes reacting the Al-containing industrial solid waste, the CO.sub.2 containing stream, and the alkali base within the mineralization reactor under reaction conditions to produce a reactor product comprising an Al-containing carbonate product.

The application of geocatalysts in controlling CO.sub.2 capture processes in situ as well as in a reaction vessel, chamber or tower is described. More specifically, a process for controlling the reaction of a CO.sub.2-containing gas stream with one or more starting materials selected from waste building material, mineral, rock, sand, amorphous material or combinations thereof is disclosed: wherein said starting material comprises Si and/or Al, and one or more divalent cation(s), water, and one or more organic compound(s) to control the reaction: thereby providing a product comprising: at least one carbonate mineral and preferably colloidal silica.

A recombinant microorganism including a genetic modification that increases activity of nitric oxide reductase in the recombinant microorganism, a composition for reducing a concentration of nitric oxide in a sample, the composition including the recombinant microorganism, and a method of reducing a concentration of nitric oxide in a sample, are disclosed.