- Removing odor of landfill gas is solved deodorizing filter. Deodorizing filter is rectangular aboveground tank shell is made up of PP wall elements. It is covered with a removable arched roof of PP sheets that resist UV radiation. Vertical walls and domed roof are insulated with 100 mm mineral fleece and sheathed with aluminum sheet. Inside the tank is a grid system in which the active layer of organic load consisting of peat, compost, bark, limestone, supporting nutritional elements and a mixed culture of bacteria. Under the roof are installed nozzles on wetting wetting the substrate.