The present disclosure is directed to the use of elemental or speciated iodine and bromine to control total mercury emissions.

A process for removing hydrocarbons from a feed stream containing hydrocarbons includes introducing ozone to the feed stream to produce an ozone doped stream containing ozone and hydrocarbons, and contacting the ozone doped stream with a supported metal catalyst at a temperature of from 100° C. to 300° C. to produce a treated stream, wherein the supported metal catalyst comprises iron supported on a support selected from aluminosilicates, silica-aluminas, silicates and aluminas. A process for removing NOx from a feed stream containing NOx, and an apparatus for removing hydrocarbons and/or NOx from a feed stream containing hydrocarbons and/or NOx are also provided.

A process for the treatment of waste water, spent air, and hydrocarbon containing liquid and gaseous streams in the cumene/phenol complex is described. Various effluent streams are combined in appropriate collection vessels, including a spent air knockout drum, a hydrocarbon buffer vessel, a fuel gas knockout drum, a phenolic water vessel, and a non-phenolic water vessel. Streams from these vessels are sent to a thermal oxidation system.

In a system and process, organic waste is treated in a reactor to volatilize contaminants such as Perfluoroalkyl substances (PFAS) compounds and/or Contaminants of Emerging Concern (CECs) from the organic waste. Biochar may have reduced or undetectable PFAS compounds or CECs. Most or all of the gas may be thermally oxidized to convert PFAS compounds and/or CECs into less harmful and/or less toxic products or elemental compounds, which may be further removed. Energy may be recovered from one or more parts of the herein described system and process.

Some non-limiting embodiments of the present disclosure relate to a method of regenerating at least one filter medium, the method comprising flowing a flue gas stream through or by the at least one filter medium at a first temperature and increasing the temperature of the flue gas stream from the first temperature to a second temperature that exceeds the first temperature. Some non-limiting embodiments of the present disclosure relate to a method of cleaning a flue gas stream, the method comprising maintaining the NO.sub.x removal efficiency by increasing the temperature of the flue gas stream from the first temperature to a second temperature that exceeds the first temperature.

A method for removing nitrogen oxides NOx from a gaseous current, comprising the steps of: passing the gaseous current through a de-NOx catalytic bed with iron exchanged zeolite as a catalyst with the addition of ammonia as a reducing agent, wherein the molar ratio of NH3 over NOx is greater than 1.33.

In a process for the purification of a gas flow containing NO.sub.2, carbon dioxide and nitrogen, the gas flow is purified by adsorption in order to produce a flow enriched in carbon dioxide and in NO.sub.x and depleted in nitrogen, the flow enriched in carbon dioxide and in NO.sub.x and depleted in nitrogen is treated in a treatment unit in order to form a fluid enriched in NO.sub.2 with respect to the treated flow, the fluid enriched in NO.sub.2 is sent to a catalytic conversion unit making possible the conversion of at least a portion of the NO.sub.2, in the presence of oxygen and also of ammonia or of urea, to give nitrogen and water in order to produce a gas depleted in NO.sub.2 with respect to the fluid enriched in NO.sub.2, the catalytic conversion unit also being fed with a fluid having nitrogen as main component.

An apparatus for producing hydrogen in a steam methane reformer with reduced carbon emissions, the apparatus comprising: a first heat exchanger configured to heat a feed stream comprising methane to produce a heated feed stream that is at a temperature above 500° C.; a reaction zone in fluid communication with the first heat exchanger, wherein the reaction zone is configured to receive the heated feed stream under conditions effective for catalytically cracking the heated feed stream and catalytically crack the heated feed stream to produce a reformed stream, wherein the reformed stream comprises hydrogen, carbon monoxide, and unreacted methane; a shift conversion unit in fluid communication with the reaction zone, wherein the shift conversion unit is configured to receive the reformed stream in the presence of steam and produce a shifted gas stream comprising hydrogen and carbon dioxide; and a hydrogen purification unit configured to receive the shifted gas stream and purify the shifted gas stream to produce a hydrogen product stream and a tail gas; wherein the conditions effective for catalytically cracking the heated feed stream comprise providing heat to the reaction zone via combustion of a fuel and a hydrogen fuel stream in presence of an oxidizer, wherein the fuel comprises ammonia, wherein a flue gas is produced by the combustion of the fuel and the hydrogen fuel stream.

The present disclosure is directed to the use of elemental or speciated iodine and bromine to control total mercury emissions.

A control system, for controlling an injection amount of a reducing agent injected into exhaust gas flowing from a coal-fired boiler in a thermal power generation facility toward a denitrification reactor of a denitrification device, includes: a first predictor predicting a first concentration of nitrogen oxides in the exhaust gas flowing toward the denitrification reactor based on first operation data of the thermal power generation facility; and a control device controlling the injection amount based on a predicted value of the first concentration. The first operation data includes at least either one of second operation data and third operation data, the second operation data being operation data of one or more coal pulverizers provided in the thermal power generation facility, and the third operation data being operation data of the coal-fired boiler affected by variation in operation conditions of the one or more coal pulverizers.