Abstract: According to the present invention, a mercury removing system (A) includes a reaction gas supplier (20) that supplies reaction gas to treatment target gas; de-nitration equipment (2) that reduces nitrogen oxide in the treatment target gas to be removed and oxidizes low water-soluble mercury in the treatment target gas to obtain water-soluble mercury; and desulfurization equipment (7) that removes sulfur oxide and the low water-soluble mercury in the treatment target gas. The mercury removing system further includes an oxidation gas vaporizer (124) that heats an oxidation gas generating liquid to generate oxidation gas and a gas mixer (13) that mixes the oxidation gas with reducing gas to obtain the reaction gas, outside a flue and on the upstream side of the reaction gas supplier (20).

Abstract: A method of controlling air pollution arising from sulphur trioxide and or sulphuric acid in coal combustion gases, combustion gases passing through the demister region of a wet flue gas desulphurization unit are exposed to a sulphide based reducing agent such as hydrogen sulphide, such that metal catalysts promoting the oxidation of ammonia leading to the formation of nitrosylsulfuric acid are poisoned and so prevented from catalysing the formation and discharge of sulphuric acid in aerosol emissions in stack gases.

Abstract: An up-flow fluidized bed dry scrubber and a method of operating same. The scrubber includes up-flow reactors. The reactors receive an exhaust gas flow containing pollutants and each reactor includes one or more spray lances that inject a dry, powdered sorbent into the flow vertically onto material dispersion assemblies installed in the reactor and one or more dual-fluid spray lances with multiple spray nozzles that introduce humidification water into the flow in the reactor. The sorbent and the humidification water combine to create a fluidized sorbent bed in the flow when the flow is sufficient to suspend the fluidized sorbent bed in the reactor, in which pollutants react with the sorbent in the bed and are removed from the gas as the gas flows through the bed in the reactor.

Abstract: Methods for removing acid gases and recovering water from flue gas. A flue gas is introduced into a water spray tower and is cooled by direct contact with a sprayed aqueous stream to condense a portion of the water vapor in the flue gas. Acid gases present in the flue gas are absorbed into the aqueous mixture, and a chemical added to the stream facilitates conversion of absorbed acid gases. The aqueous stream leaving the spray tower is next treated to remove contaminants, such as carbonates and bicarbonates, thereby producing a cleaned aqueous stream that may be split into a stream that is cooled prior to reuse in the spray tower, as well as a stream that is fed back to the boiler.

Abstract: An air pollution control system 10A according to the present invention includes: a boiler 11 that burns fuel; NOx removal equipment 12 that decomposes nitrogen oxides in flue gas 25 discharged from the boiler 11; a desulfurizer 15 that causes sulfur oxides in the flue gas 25 having passed through the NOx removal equipment 12 to be absorbed by an absorbent, thereby reducing sulfur oxides in the flue gas 25, a waste-water treatment device 16 including a solid-liquid separating unit 31 that separates desulfurized waste water 28 discharged from the desulfurizer 15 into a solid fraction and a liquid fraction, and a mercury removing unit 32 that removes mercury in the desulfurized waste water 28; and a treated waste-water returning unit (a makeup water line) 17 that returns at least a part of treated waste water 40 treated by the waste-water treatment device 16 to the desulfurizer 15.

Abstract: An air pollution control system 10A includes a boiler 11 that burns fuel, an air heater 13 that recovers heat of flue gas 17 from the boiler 11, and a desulfurizer 15 that reduces sulfur oxides contained in the flue gas 17 after heat recovery by an absorbent, and waste-water supplying units P0 to P5 that supply desulfurized waste water 28 discharged from the desulfurizer 15 to at least one of a path for supplying fuel to the boiler 11, inside of a furnace of the boiler 11, and the inside of a flue gas duct between the boiler 11 and the air heater 13 are installed. With this configuration, an amount of desulfurized waste water to be returned into the flue gas duct per unit time can be increased as compared to conventional systems, without increasing the size of the entire air pollution control system.

Abstract: A process for simultaneously desulfurizing and denitrating the flue gas with seawater includes the following steps: 1) catalytically scrubbing the flue gas containing SO2 and NOx with the seawater to obtain purified flue gas and acidic seawater, optionally adding a certain quantity of iron ions into the seawater or applying magnetic field during scrubbing; 2) adding seawater into the acidic seawater while blowing air in so as to restore the quality of the acidic seawater up to the environmental standards. Also a device used in the process is provided.

Abstract: A method for removing mercury in a combustion exhaust gas includes injecting ammonia or urea as a reducing agent into a combustion exhaust gas containing nitrogen oxides, sulfur dioxide, metallic mercury, and hydrogen halides, and then introducing the combustion exhaust gas to a denitration apparatus filled with a denitration catalyst to cause a denitration reaction and oxidize the metallic mercury to produce mercury halide; and introducing the combustion exhaust gas through an air preheater and an electric dust collector to a wet desulfurization apparatus, thereby removing sulfur dioxides and the mercury halide, wherein the ammonia concentration of the combustion exhaust gas at an exit of the denitration apparatus is maintained at 5 ppm or higher, and the mercury halide is adsorbed or precipitated onto combustion ash and collected by the electric dust collector to discharge the mercury halide out of a system.

Abstract: The disclosure provides methods and systems for sequestering and/or reducing carbon dioxide present in an industrial effluent fluid stream containing carbon dioxide. A scrubbing material comprising a first component, a second component (distinct from the first component), and preferably water, is contacted with the effluent fluid stream. The first component comprises a source of calcium oxide and a source of alkali metal ions. The second component comprises a slag having one or more reactive silicate compounds. Methods of reducing carbon dioxide from exhaust generated by combustion sources, lime and/or cement kilns, iron and/or steel furnaces, and the like are provided. Carbon dioxide emission abatement systems are also disclosed. Methods of recycling industrial byproducts are further provided.

Abstract: An improvement in the method for preventing re-emissions of mercury from a wet flue gas desulfurization (FGD) system by addition of an additive to the FGD scrubber liquor which interacts in the system scrubber with mercury present in the flue gas to curtail the mercury re-emissions; the mercury re-emissions are reduced to substantially zero by use of an additive selected from one or more members of the group consisting of a dithiol, a dithiolane, and a thiol having a single thiol group and either an oxygen or a hydroxyl group.

Abstract: Methods and apparatuses are provided for protecting a catalyst within a combustor. In one embodiment, a catalytic reactor includes a protective coating that may be chemically removed or mechanically removed while the catalytic reactor is disposed in a combustor.

Abstract: An improved process for deacidizing a gaseous mixture using phase enhanced gas-liquid absorption is described. The process utilizes a multiphasic absorbent that absorbs an acid gas at increased rate and leads to reduced overall energy costs for the deacidizing operation.

Abstract: A composition for removing mercaptan from a gas stream containing at least one acid gas in addition to a mercaptan, the composition comprising a physical and/or chemical solvent for H2S and an inclusion compound for the mercaptan. A process of treating gas stream using the composition. The inclusion compound is selected from the group consisting of, cyclodextrin, cryptand, calixarene, cucurbituril. The chemical solvent may be monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA, diisopropylamine (DIPA), diglycolamine (DGA) and methyldiethanolamine (MDEA). Examples of useful physical solvents include cyclotetramethylene sulfone (sulfolane) and its derivatives, aliphatic acid amides, NMP (n-methylpyrrolidone), N-alkylated pyrrolidones and corresponding piperidone, methanol and mixtures of dialkethers of polyethylene glycols. The method comprises scrubbing preferably the natural gas with an aqueous solution comprising the above compounds followed by a stripping regeneration step.

Abstract: A method of HCN removal from syngas including treating a hot syngas stream for conversion to chemical products by removing various components from the hot syngas stream by: passing the hot syngas stream to a scrubber; adding aldehyde to a circulating scrubber water; capturing ammonia and HCN in the circulating scrubber water and condensing water from the hot syngas stream into the circulating scrubber water; withdrawing a scrubber waste water effluent from the scrubber comprising absorbed ammonia, ammonium, and absorbed HCN, and glycol nitriles, formed from the reaction of the aldehydes with HCN, from the scrubber; withdrawing a treated syngas stream effluent from the scrubber having a reduced concentration of ammonia and HCN; and, passing at least a portion of the scrubber waste water effluent stream to a biological treatment zone for the removal of ammonia, absorbed HCN, and glycol nitriles.

Abstract: Disclosed herein is an anaerobic digester configured to include input reactors into which livestock wastewater or food waste (hereinafter, ‘inflow’) is introduced; regions of an anaerobic digestion reactor designed for the inflow passing through an input reactor to perform methane fermentation to produce and transfer biogas simultaneously into the next region; an inlet pipe into which sludge liquid is drawn; an inlet pipe into which activated liquid is drawn; a biogas capturing device; a first heat exchange tube to allow the sludge liquid to perform heat exchange with a new inflow; regions of a subsequent treatment reactor to allow the sludge liquid whose heat exchange is completed to be introduced and to treat gas odor components generated from the sludge liquid; and a liquid-composting reactor in which the emitted sludge whose odor components have been removed is stored.

Abstract: An absorption medium for removing acid gases from a fluid stream comprises an aqueous solution of a) of at least one metal salt of an aminocarboxylic acid, and b) of at least one acid promoter, wherein the molar ratio of b) to a) is in the range from 0.0005 to 1.0. The acid promoter is selected from mineral acids, carboxylic acids, sulfonic acids, organic phosphonic acids and partial esters thereof. The absorption medium, compared with absorption media based on amino acid salts, has a reduced regeneration energy requirement without significantly reducing the absorption capacity of the solution for acid gases. In a process for removing acid gases from the fluid stream, the fluid stream is brought into contact with the absorption medium.

Abstract: Methods, systems, apparatuses and compositions for extracting selected gases from a gas stream are provided. In some embodiments the invention involve a process of bringing a gas stream in contact with a primary sorbent, releasing a selected gas from the primary sorbent to create a selected gas-enriched gas mixture, and bringing the selected gas-enriched gas mixture in contact with an aqueous solution. The aqueous solution absorbs the selected gas from the selected gas-enriched gas mixture. In some embodiments, the selected gas is carbon dioxide.

Abstract: A system and method for removing pollutants and greenhouse gases SO2, NO2, and CO2 from a flue gas stream, includes: a) contacting natural seawater with a flue gas for a given period of time to remove SO2 from the flue gas; b) contacting treated alkaline water to the flue gas to remove CO2 and NOx from the flue gas and generate oxygen and carbon particles; and c) collecting or emitting the flue gas after step b). The method and the system of the invention are significantly more economical and convenient and do not cause harm to the environments. The invention also exhibits a novel and unique feature that elemental carbon and oxygen are generated as final products and can be recovered as an energy source.

Abstract: A method of desulfurizing flue gas in connection with oxy-combustion. A sulfur containing gas flow is introduced to a flue gas desulfurization arrangement having a spray tower at its top part and a reaction tank at its bottom part, in which the reaction tank contains liquid slurry having a surface level L. Sorbent-containing liquid slurry is sprayed to the sulfur containing gas flow. Sulfur-containing molecules are allowed to be absorbed into liquid slurry droplets. The liquid slurry droplets are allowed to enter the liquid slurry in the reaction tank. Oxygen containing gas is bubbled in the liquid slurry from a gas inlet header and nozzles in the reaction tank, in which the nozzles are arranged at a certain level in the reaction tank. Sulfur-containing particulates settle in the reaction tank.

Abstract: A gaseous mixture, comprising CO2, H2, H2S and optionally CO, is separated into an H2 or H2 and CO product stream (H2/CO product stream), and a CO2 enriched stream containing at least one combustible component selected from H2S, H2, CO and any additional combustible components present in the gaseous mixture. A support fuel stream, comprising one or more combustible components, is combusted to form a stable flame, and the CO2 enriched stream and flame are contacted in the presence of sufficient O2 to combust all or substantially all of the combustible component(s) present in said CO2 enriched stream. A CO2 product stream is formed from said combustion effluent. The support fuel stream may be generated from the process of generating or separating the gaseous mixture or from the H2/CO product stream. Where the CO2 enriched stream contains H2S, the support fuel stream may also be a stream obtained off-site that comprises H2S.

Abstract: An integrated process for operating a fossil fuel fired power plant including: producing hydrogen gas and an aqueous solution of hydrogen peroxide via a process including: dissociating hydrogen gas and oxygen gas from water; pressurizing the hydrogen gas and the oxygen gas; and mixing, under pressure, the oxygen gas and at least about a stoichiometric portion of the hydrogen gas with an aqueous solution of a catalyst and a promoter to form the aqueous solution of hydrogen peroxide; supplying a remainder of the hydrogen gas to at least one of (a) a storage means, (b) a boiler detonation cleaning system of the fossil fuel fired power plant, and (c) an electrical generator of the fossil fuel fired power plant; and injecting the aqueous solution of hydrogen peroxide into an air pollution control system of the fossil fuel fired power plant.

Abstract: A system for forming metal hydroxide from a metal carbonate utilizes a water electrolysis cell having an acid-producing anode and a hydroxyl-producing cathode immersed in a water solution of sufficient ionic content to allow an electric current to pass between the hydroxyl-producing cathode and the acid-producing anode. A metal carbonate is placed in close proximity to the acid-producing anode. A direct current electrical voltage is provided across the acid-producing anode and the hydroxyl-producing cathode sufficient to generate acid at the acid-producing anode and hydroxyl ions at the hydroxyl-producing cathode. The acid dissolves at least part of the metal carbonate into metal and carbonate ions allowing the metal ions to travel toward the hydroxyl-producing cathode and to combine with the hydroxyl ions to form the metal hydroxide. The carbonate ions travel toward the acid-producing anode and form carbonic acid and/or water and carbon dioxide.

Abstract: Horizontal gas-liquid scrubbing systems and associated gas scrubbing methodologies are provided. In one embodiment, a horizontal duct scrubbing system includes a horizontally disposed housing having a waste gas inlet and a treated gas outlet, a liquid inlet manifold disposed within the horizontally disposed housing, the liquid inlet manifold comprising a plurality of nozzles oriented to spray a scrubbing liquor co-current to the flow of a gas stream flowing through the horizontally disposed housing, and a demister located proximal the treated gas outlet, where the horizontally disposed housing is substantially free of flow deflection members between the liquid inlet manifold and the demister.

Abstract: The disclosure provides methods and systems for sequestering and/or reducing carbon dioxide present in an industrial effluent fluid stream containing carbon dioxide. A scrubbing material comprising a first component, a second component (distinct from the first component), and preferably water, is contacted with the effluent fluid stream. The first component comprises a source of calcium oxide and a source of alkali metal ions. The second component comprises a slag having one or more reactive silicate compounds. Methods of reducing carbon dioxide from exhaust generated by combustion sources, lime and/or cement kilns, iron and/or steel furnaces, and the like are provided. Carbon dioxide emission abatement systems are also disclosed. Methods of recycling industrial byproducts are further provided.

Abstract: The present invention relates to a method for cleaning off-gas comprising the following steps: 1. Sulphur dioxide is separated from the off-gas by way of at least one first scrubber stage (c) by means of ammonia or ammonium compounds, 2. the off-gas is transferred into a second scrubber stage (d) and 3. in the second scrubber stage the sulphur dioxide not separated in the first scrubber stage (c), is oxidized to sulphuric acid and separated in at least one scrubber (d) and simultaneously, the ammonia released in the first scrubber stage (d) is separated by means of the formed sulphuric acid, whereby ammonium sulphate is formed, 4. the separated stream of the second scrubber stage (d) is transferred into the first scrubber stage (c).

Abstract: A method for controlling multipollutant (e.g., SO2, NOx, Hg0 and Hg2+) emissions from a gas stream of a stationary combustion source, an apparatus for controlling multipollutant emissions, and a wet scrubber additive composition for controlling multipollutant emissions are disclosed.

Abstract: A flue gas desulfurization process in which a SO2-containing flue gas stream is contacted with a recirculating stream of an aqueous medium containing concentrated sulfuric acid and hydrogen peroxide, to yield a desulfurized flue gas stream and to produce additional sulfuric acid in the aqueous medium. A portion of the recirculating aqueous sulfuric acid stream is diverted for recovery of the additional sulfuric acid as gypsum in a neutralization step, and the process parameters are adjusted so that the heat of reaction generated during the neutralization step is sufficient to evaporate the free water that is present and yield a gypsum product that is substantially dry.

Abstract: A method and an equipment for reducing sulphur dioxide emissions of a marine engine, wherein flue gases are scrubbed with a scrubbing solution in a scrubber. Fresh water with added sulphur removal reagent is used as the scrubbing solution.

Abstract: A device and a method for producing a fine liquid mist and injecting the said mist into a gas stream to capture and remove very fine particulate pollutants. The pressurized gas stream is passed into a droplet generator (20) into which the liquid is sprayed and atomised into a mist which captures particulates and then into a droplet separator (30) to produce a separated liquid/particulate mixture and a gas stream with a reduced concentration of particulates. The main application is the removal of fine particulates from vehicle exhaust streams. Optionally a degassing stage (90) is provided for the removal of residual gases and vapours. The preferred liquid to form the mist is water.

Abstract: A cement kiln chlorine/sulfur bypass system wherein the equipment cost is suppressed and the sulfur included in a combustion gas bled from a cement kiln is separated and effectively utilized. The cement kiln chlorine/sulfur bypass system comprises an air bleed means for bleeding a kiln exhaust gas passage, which runs from the end of the cement kiln to a bottom cyclone, of a part of the combustion gas, a separating means for separating dust in the gas bled by the air bleed means into coarse particles and fine particles, and a wet dust collector for collecting dust from the gas containing the fine particles separated by the separating means. The separating means is preferably a classifier in which the cut size is changeable. The wet dust collector is preferably a mixing scrubber.

Abstract: A method for the high removal of ammonia, COS and HCN from syngas (along with some polishing of particulates) in a cost effective and environmentally benign and sustainable fashion, with the need for little to no chemical addition by using a combination of water based gas scrubbing, HCN scrubbing and biological processing steps.

Abstract: A mercury reduction system according to the present embodiment is a mercury reduction system that reduces NOx and Hg in flue gas discharged from a boiler, and includes an NH4Cl solution spraying unit that sprays an NH4Cl solution into a flue of the boiler in a liquid state, a mixed gas spraying unit that is provided downstream of the NH4Cl solution spraying unit and sprays mixed gas containing NH3 gas and HCl gas into the flue, a reduction denitration apparatus that includes a denitration catalyst reducing NOx in the flue gas with NH3 and oxidizing Hg in the presence of HCl, and a wet desulfurization apparatus that reduces Hg oxidized in the reduction denitration apparatus with a limestone-gypsum slurry.

Abstract: The disclosure provides methods and systems for sequestering and/or reducing carbon dioxide present in an industrial effluent fluid stream containing carbon dioxide. A scrubbing material comprising a first component, a second component (distinct from the first component), and preferably water, is contacted with the effluent fluid stream. The first component comprises a source of calcium oxide and a source of alkali metal ions. The second component comprises a slag having one or more reactive silicate compounds. Methods of reducing carbon dioxide from exhaust generated by combustion sources, lime and/or cement kilns, iron and/or steel furnaces, and the like are provided. Carbon dioxide emission abatement systems are also disclosed. Methods of recycling industrial byproducts are further provided.

Abstract: Horizontal gas-liquid scrubbing systems and associated gas scrubbing methodologies are provided. In one embodiment, a horizontal duct scrubbing system includes a horizontally disposed housing having a waste gas inlet and a treated gas outlet, a liquid inlet manifold disposed within the horizontally disposed housing, the liquid inlet manifold comprising a plurality of nozzles oriented to spray a scrubbing liquor co-current to the flow of a gas stream flowing through the horizontally disposed housing, and a demister located proximal the treated gas outlet, where the horizontally disposed housing is substantially free of flow deflection members between the liquid inlet manifold and the demister. The gas stream may include sulfur dioxide, and the system may be capable of removing at least 71 vol. % sulfur dioxide from the gas stream.

Abstract: A mercury reduction system according to the present embodiment is a mercury reduction system that reduces NOx and Hg in flue gas discharged from a boiler, and includes a chemical supplying unit that mixes an NH4Cl solution, an NH3 solution, and an HCl solution in liquid states, and supplies a mixed solution into a flue provided downstream of the boiler, a reduction denitration apparatus that includes a denitration catalyst reducing NOx in the flue gas with NH3 and oxidizing Hg in the presence of HCl, and a wet desulfurization apparatus that reduces Hg oxidized in the reduction denitration apparatus with limestone-gypsum slurry.

Abstract: A method of removing sulfur dioxide from flue gases using calcium and magnesium scrubbing components and treatment of oxidized effluent from such a system includes passing classified oxidized effluent to a regeneration tank and adding lime to produce a regenerator discharge containing magnesium hydroxide, gypsum and crystalline inert material. Gypsum is separated from the discharge and a magnesium hydroxide stream passed to a concentration system to produce a concentrated solids stream of magnesium hydroxide, residual minor amount of gypsum and crystalline inert material. A portion of the resultant stream is returned to the sulfur dioxide removal system while a portion is passed to the oxidizer. Further portions may be fed to a power plant boiler or to the flue gas stream between a solids collection device and the wet scrubber.

Abstract: A method of introducing flue gas, from a flue stack in a steam-assisted production facility, into a heat exchanger. The flue gas comprises boiler combustion products selected from at least one of commercial pipeline gas and produced gas. The method begins by cooling a portion of the water vapor in the flue gas in the heat exchanger to produce flue gas water. This flue gas water is then collected and removed as make-up water.

Abstract: A gas cleaning system, which is operative for cleaning a process gas containing carbon dioxide and sulphur dioxide, comprises a combined cooling and cleaning system (16), and a CO2-absorber. The combined cooling and cleaning system (16) comprises a first gas-liquid contacting device (50) located upstream of the CO2-absorber and operative for cooling the process gas by means of a cooling liquid, and for absorbing into the cooling liquid sulphur dioxide of the process gas, such that a cooling liquid containing sulphate is obtained. The combined cooling and cleaning system (16) further comprises a second gas-liquid contacting device (94) located downstream of the CO2-absorber and operative for removing ammonia from the process gas, which has been treated in the CO2-absorber, by means of bringing the process gas containing ammonia into contact with the cooling liquid containing sulphate.

Abstract: A method for controlling multipollutant (e.g., SO2, NOx, Hg0 and Hg2+) emissions from a gas stream of a stationary combustion source, an apparatus for controlling multipollutant emissions, and a wet scrubber additive composition for controlling multipollutant emissions are disclosed.

Abstract: A method of removing SOx from a flue gas stream including SOx includes providing a source of trona and injecting the trona as a dry sorbent into the flue gas stream. The temperature of the flue gas is at an elevated temperature greater than 400° F., preferably between about 600° F. and about 900° F. The trona is maintained in contact with the flue gas for a time sufficient to react a portion of the trona with a portion of the SOx to reduce the concentration of the SO2 and/or SO3 in the flue gas stream.

Abstract: A scrubber for scrubbing at least one pollutant from flue gas includes a first stage configured to provide a chemical oxidant to a stream of flue gas, and a second stage configured to provide a chemical or chemicals to the stream of flue gas, a scrubbing medium recirculation feature configured to continuously recirculate a slurry used in the second stage, and a by-product processing portion configured to remove a by-product from a stream of slurry withdrawn from the scrubber. The by-product includes reaction products of at least one pollutant.

Abstract: An process for efficiently deacidizing a gaseous mixture is described. The process utilizes a self-concentrating absorbent that absorbs an acid gas at reduced overall energy costs for the deacidizing operation.

Abstract: A process for reducing hydrogen sulfide from a gas comprising contacting the gas with an aqueous scrubbing liquid recycled from a sour water stripper. The aqueous scrubbing liquid comprises ammonia. The contacting of the gas with the aqueous scrubbing liquid thereby produces a semi-sweet gas with reduced concentration of hydrogen sulfide and a rich liquid solution.

Abstract: This invention involves a marine ship flue gas scrubbing equipment and scrubbing method. The equipment includes a shell with an upper scrubbing section and a water tank in the lower section. A smoke pipe leads in exhaust gas to an area between the scrubbing section and water tank. Scrubbing seawater is injected through an inlet above the scrubbing section, and a cooler is located along the pathway of the exhaust gas. The method of scrubbing includes leading-in exhaust gas, cooling the exhaust gas, injecting scrubbing seawater, performing scrubbing operation, and discharging clean gas. Embodiments of the invention provide a highly efficient scrubbing equipment and method suitable for high-temperature exhaust gas within a limited usable space. The methods and equipment are highly effective for emission reduction, has low energy consumption, small size, and long life performance.

Abstract: Methods and apparatuses are described for contacting an oxidizing solution such as an aqueous hydrogen peroxide composition of hydrogen peroxide and at least one additive that catalyzes the decomposition of the hydrogen peroxide into hydroxyl radicals with an atmospheric effluent containing odorous and/or noxious components. These components are absorbed by the aqueous hydrogen peroxide composition to produce an atmospheric effluent having reduced amounts of the odorous and/or noxious components. Various methods are described for adding the hydrogen peroxide and the decomposition additive.

Abstract: This combustion exhaust gas processing device comprises a dust collector collecting dust in combustion exhaust gas, a wet dust collector collecting water soluble components and dust in the combustion exhaust gas passed through the dust collector, and a catalyst tower decomposing and removing NOx and/or dioxins in the combustion exhaust gas passed through the wet dust collector. The device also comprises a reheater heating the combustion exhaust gas discharged from the wet dust collector at the front stage of the catalyst tower, an oxidizer adding device adding an oxidizer to the combustion exhaust gas passed through the dust collector, a solid/liquid separator separating slurry discharged from the wet dust collector into solid and liquid phases, a mercury adsorbing tower adsorbing mercury in liquid separated in the solid/liquid separator, and a heat recovering device heating the combustion exhaust gas discharged from the catalyst tower at the rear stage thereof.

Abstract: A method of removing SO3 from a flue gas of a boiler. The method includes the following steps: injecting chloride salts into a stream of the flue gas at a position located downstream of an air pre-heater—the position is selected so that the flue gas has a temperature at the position of substantially between 100° C. and 400° C.; reacting chloride salts with the SO3 to form a sulfate-containing reaction product; and collecting the sulfate-containing reaction product in a particulate collector downstream of the boiler. A purge stream from a wet flue gas desulfurization system may be used as a source of the chloride salts. Additional chlorides may be added to the purge stream as necessary.

Abstract: A process for desulfurizing an SO2-comprising gaseous stream comprising the steps of: a. providing an aqueous feed comprising an anion selected from a group consisting of carbonate, bicarbonate, hydroxide, sulfite, and hydrogen sulfite; b. providing an SO2-comprising gaseous feed; and c. contacting the aqueous feed and the gaseous feed to generate a desulfurized gaseous product comprising less than 40% of the feed SO2 content, and an aqueous product; wherein the contacting is carried out in a cyclone unit comprising a housing defined by a cylindrical peripheral wall and provided with at least one inlet opening for receiving fluids thereinto and with at least one swirling means, and wherein the cyclone unit is characterized in that the velocity of the gaseous stream inside the cyclone unit is between 20 m/sec and 120 m/sec.

Abstract: A process for removal of SO2 in off-gases having a temperature of 30-150° C. and containing 0.001-1 vol % SO2 in which the SO2 is oxidised to H2 SO4 by spraying an aqueous solution of H2O2 into the off-gas upstream of an aerosol filter removing the produced sulphuric acid from the off-gas.

Abstract: A flue gas desulfurization process and system that utilize ammonia as a reactant, and in which any hydrogen sulfide and/or mercaptans within the ammonia are separated during the desulfurization process so as to prevent their release into the atmosphere. The process and system entail absorbing acidic gases from a flue gas with a scrubbing media containing ammonium sulfate to produce a stream of scrubbed flue gas, collecting the scrubbing media containing the absorbed acidic gases, injecting into the collected scrubbing media a source of ammonia that is laden with hydrogen sulfide and/or mercaptans so that the injected ammonia is absorbed into and reacted with the collected scrubbing media, stripping the hydrogen sulfide and/or mercaptans from the collected scrubbing media by causing the hydrogen sulfide and/or mercaptans to exit the collected scrubbing media as stripped gases, and collecting the stripped gases without allowing the stripped gases to enter the stream of scrubbed flue gas.