Systems and methods for recovery of gaseous substances from molten salt electrolysis are generally described. Certain systems comprise a cell configured for molten salt electrolysis; a collector fluidically connected to the cell and configured to collect volatilized molten salt from the cell; and a gas scrubber fluidically connected to the collector and configured to at least partially remove a gas from an effluent stream of the cell. Some methods comprise, using a pressure gradient: transporting a gas comprising molten salt vapor from an electrolytic cell to and through a collector such that at least a portion of the molten salt vapor forms a solid within the collector; and transporting some or all of the gas from the collector through a gas scrubber.

Described is a method and system for sequestration of carbon dioxide from atmospheric air. The method and system involves the enabling of atmospheric air to pass into an upper end of an elongate hollow tower. An aqueous solution is charged (e.g. via a distributor) so as to mix with the atmospheric air within and adjacent to the tower upper end in a manner such that the air is cooled by evaporative cooling. As a result, the mixture passes downwards as a stream through the hollow tower. The aqueous solution includes a reagent added thereto that reacts with the carbon dioxide to form a compound in the solution to thereby sequester the carbon dioxide from the atmospheric air. The method and system also can generate electricity from the downwards stream that is passing through the hollow tower.

An intermixer or mixing device with frame structure and suspended bluff body array for use in a stationary (e.g., non-auto) SCR catalyst environment to reduce RMS levels of a mix of NO.sub.x pollutant and reduction reagent. SCR reactor apparatus with SCR catalyst module block supported on the intermixer. The SCR reactor apparatus works in an SCR reactor assembly having the SCR reactor apparatus at a first SCR1 layer plus a downstream SCR2 layer. The reduced RMS level of the mix coming from the SCR1 layer is readily able to be treated by the SCR2 layer. An SCR system features the SCR reactor assembly and a combustion source such as a coal-fired plant. Methods of assembly and operating each of the mixing device, SCR reactor apparatus, assembly and system are also featured.

A contactor media can include continuous surface segments. The continuous surface segments can define first and second capillary flow paths. A first continuous surface segment can have at least 50% of its surface area follow at least one of: (a) a contour of a first zero-thickness surface having a Gaussian curvature (G.sub.c) of 400 mm.sup.2G.sub.c<0.01 mm.sup.2; and (b) a contour of a second zero-thickness surface having at least one principal curvature (k.sub.i) of 20 mm.sup.1k.sub.i<0.1 mm.sup.1.

A system for removing carbon dioxide from a gas includes: an eductor, a CO.sub.2-lean gas outlet fluidly coupled to the eductor, a fan fluidly coupled to the CO.sub.2-lean gas outlet, the fan being rotatable to discharge the CO.sub.2-lean gas from the CO.sub.2-lean gas outlet, and a capture solution tank. The eductor includes a capture solution inlet operable to receive a lean capture solution, a gas inlet operable to receive the gas that includes carbon dioxide, a mixing zone configured to react the lean capture solution and the gas that includes carbon dioxide; and, an eductor outlet operable to discharge a mixed fluid that includes a rich capture solution and a CO.sub.2-lean gas. The capture solution tank is fluidly coupled to the eductor outlet and to the CO.sub.2-lean gas outlet, and the capture solution tank configured to collect the rich capture solution.

A contactor media includes continuous surface segments, wherein a first continuous surface segment has at least 50% of its surface area follow at least one of: (a) a contour of a first zero-thickness surface having a Gaussian curvature (G.sub.c) of 400 mm.sup.2G.sub.c<0.01 mm.sup.2; and (b) a contour of a second zero-thickness surface having at least one principal curvature (k.sub.i) of 20 mm.sup.1k.sub.i<0.1 mm.sup.1; and wherein the first continuous surface segment provides at least: (a) a total liquid hold-up of between about 1 kg/m.sup.3 to about 800 kg/m.sup.3 or (b) a static liquid hold-up of about 0.1 kg/m.sup.3 to about 800 kg/m.sup.3.

An apparatus comprises a chamber, an emitter configured to emit electromagnetic radiation into the chamber, and an igniter configured to provide energy at an ignition point within the chamber to initiate a gas discharge. The emitter and the igniter are operable in conjunction to generate nonthermal plasma within the chamber at atmospheric pressure.

Systems and methods for recovery of gaseous substances from molten salt electrolysis are generally described. Certain systems comprise a cell configured for molten salt electrolysis; a collector fluidically connected to the cell and configured to collect volatilized molten salt from the cell; and a gas scrubber fluidically connected to the collector and configured to at least partially remove a gas from an effluent stream of the cell. Some methods comprise, using a pressure gradient: transporting a gas comprising molten salt vapor from an electrolytic cell to and through a collector such that at least a portion of the molten salt vapor forms a solid within the collector; and transporting some or all of the gas from the collector through a gas scrubber.

A method for simultaneously removing high-load sulfur dioxide and nitrogen oxide in waste gas, relating to the technical field of industrial waste gas purification by biological methods. According to the method, the waste gas is led into a simultaneous desulfurization and denitrification packing tower and removed, microbial floras for simultaneously removing the sulfur dioxide and the nitrogen oxide are loaded on fillers of the packing tower, and the molar concentration ratio of the sulfur dioxide to the nitrogen oxide in the waste gas is (0.761.06):1.

A contactor media includes continuous surface segments, wherein a first continuous surface segment has at least 50% of its surface area follow at least one of: (a) a contour of a first zero-thickness surface having a Gaussian curvature (G.sub.c) of 400 mm.sup.2G.sub.c<0.01 mm.sup.2; and (b) a contour of a second zero-thickness surface having at least one principal curvature (k.sub.i) of 20 mm.sup.1k.sub.i<0.1 mm.sup.1; and wherein the first continuous surface segment provides at least: (a) a total liquid hold-up of between about 1 kg/m.sup.3 to about 800 kg/m.sup.3 or (b) a static liquid hold-up of about 0.1 kg/m.sup.3 to about 800 kg/m.sup.3.