TREATMENT OF METHYL BROMIDE-CONTAINING WASTE GAS

摘要

PURPOSE:To provide a treating method of a methyl bromide-containing waste gas capable of removing, decomposing and making gaseous methyl bromide harmless at low cost efficiently. CONSTITUTION:The methyl bromide-containing waste gas is supplied from a fumigating storehouse 10 to activated carbon towers 12a-12c and methyl bromide in the waste gas is adsorbed on the activated carbon. The methyl bromide-adsorbed activated carbon 12a is heated and the methyl bromide adsorbed on the activated carbon is desorbed from the activated carbon. The heat of the combustion waste gas of a catalyst tower 16 is used as a heat source at this time. The desorbed methyl bromide is heated by the heat of the combustion waste gas of the catalyst tower 16 with a heat exchanger, then supplied to the catalyst tower 16 and subjected to combustion decomposition there to produce hydrogen bromide. This decomposed gas containing the hydrogen bromide is absorbed in a sodium hydroxide soln. at an absorption tower 20 to produce harmless sodium bromide.