A catalytic recombiner and filter apparatus is especially suited for placement in a containment of a nuclear reactor. The apparatus has a natural convection flow duct with a number of catalytic elements for recombining hydrogen and oxygen contained in a gas flow through the flow duct. The catalytic recombiner and filter apparatus provides for reliable hydrogen reduction and iodine filtering for a gas flow even for a comparatively long period of operation. The catalytic recombiner and filter apparatus includes a number of adsorber elements with iodine adsorbing surfaces and with macroscopic flow channels in between. The iodine adsorbing surfaces are flown over by the gas flow, and the adsorber elements are arranged, when in use, downstream of the catalytic elements in a direction of the gas flow.

Provided are a filtration material for filtered venting and a filtered venting device that are more effective in adsorbing radioactive iodine than in the conventional art and are useful for addressing severe accidents. The filtration material for filtered venting comprises granulated zeolite L, wherein at least a portion of the ion exchange sites of the zeolite L are substituted with silver. Of the ion exchange sites, a constitution ratio (a/b) of ion exchange sites (a) substituted with silver to ion exchange sites (b) not substituted with silver is 25/75-55/45. The zeolite L has a silver content of 7-12 wt % on a dry weight basis.

A sorbent in the form of a layered, non-porous perovskite is provided, wherein the sorbent can include parallel, alternating layers of an organic layer, including an ordered array of organic moieties capable of reacting with a gaseous halogen, and an inorganic layer, including a metal-halide sheet. Furthermore, each organic layer can be sandwiched between inorganic layers. Methods for capturing one or more halogens from a gas stream are also provided, wherein the methods can include contacting a gas stream with a sorbent in the form of a layered, non-porous perovskite, wherein the sorbent can include parallel, alternating layers of an organic layer, including an ordered array of organic moieties capable of reacting with a gaseous halogen, and an inorganic layer, including a metal-halide sheet. One or more halogens in the gas stream can react with either alkyne groups or alkene groups found in the organic layer of the sorbent.

The present disclose is directed to a method for controlling iodine levels in wet scrubbers, and, in particular, recirculating wet scrubbers by removing the iodine from the scrubbing solution, such as by using ion exchange, absorption, adsorption, precipitation, filtration, solvent extraction, ion pair extraction, and an aqueous two-phase extraction.

The present invention provides a treatment method of a radioactive iodine-containing fluid, comprising passing the radioactive iodine-containing fluid through an adsorbent for iodine consisting of a silver-containing binderless zeolite molded body having a silver content of 50 mass % or less, to adsorb the radioactive iodine on the adsorbent for iodine.

A methyl iodide adsorber, comprising a zeolite containing at least one iodide-adsorbing metal or a compound thereof, wherein the zeolite is a hydrophobic zeolite. Also, a use of the adsorber and a method for the adsorption of methyl iodide.

The present disclose is directed to a method for controlling iodine levels in wet scrubbers, and, in particular, recirculating wet scrubbers by removing the iodine from the scrubbing solution, such as by using ion exchange, absorption, adsorption, precipitation, filtration, solvent extraction, ion pair extraction, and an aqueous two-phase extraction.

A method to produce a halogen-depleted biogas is described. The method includes supplying biogas and/or a gas derived from a source of biogas to a halogen removal system to produce a halogen-depleted biogas. Biogas pre-processing, post-processing, and a product production system may be integrated with the halogen removal system to produce a product.

This invention relates to materials and methods for iodine capture from a variety of sources and media, and at water/organic solvent interfaces.

Provided are an adsorbent for trapping a radioactive iodine gas generated in a process of oxidizing a nuclear fuel at a high temperature after use and a method of preparing the same, and more particularly, a radioactive iodine gas adsorbent which is formed of bismuth as a main component, thereby exhibiting an excellent radioactive iodine gas trapping capability and an excellent thermal stability after trapping, and a method of preparing the same.

An adsorbent for trapping a radioactive iodine gas prepared by a method of preparing an adsorbent for trapping a radioactive iodine gas according to the present disclosure may effectively trap a radioactive iodine off-gas generated in a nuclear fuel pre-treated oxidizing process after use.

Particularly, the adsorbent may trap iodine in a larger amount, which is twice or more, than a silver-containing zeolite widely used to trap a radioactive iodine gas, and the trapped iodine forms a stable compound, which is more advantageous for long-term storage.

In addition, since an iodine gas is trapped using inexpensive bismuth, instead of expensive silver, in consideration of trapping a large amount of a radioactive iodine gas, the adsorbent has very excellent economic feasibility.