NOVELTY - A deodorizing unit (2) is annexed to disposer, to deodorize exhaust gas generated during bulk reduction and treatment of refuse, in a treatment tank. A dust removal duct (63) is arranged between ducts (62,67) arranged at upstream side of ventilation fan (66). Main and sub dust collection filters (64,65) are detachedly provided in inlet, outlet sides (63a,63b) of dust removal duct, respectively.    USE - For disposing organic refuse e.g. waste food generated in houses, restaurants, food processing plants, and waste fruits, vegetables, and bones, shell of fish and shellfish.    ADVANTAGE - Enables non-stop operation of the disposer as maintenance of the dust removal filters can be carried out sequentially, as the main and sub filters are arranged detachedly in the dust removal duct.    DETAILED DESCRIPTION - A deodorizing unit (2) is annexed to disposer, to deodorize exhaust gas generated during bulk reduction and treatment of refuse, in a treatment tank. A dust removal duct (63) is arranged between ducts (62,67) arranged at upstream side of ventilation fan (66). Main and sub dust collection filters (64,65) are detachedly provided in inlet, outlet sides (63a,63b) of dust removal duct, respectively. Exhaust gas flows in vertically downward direction, and in vertically upward direction, in the inlet and outlet portion of the dust removal duct, respectively. An opening provided at the bottom portion of the dust removal duct, which is positioned between the main and sub filters, is opened/closed by a lid. A drain cock is provided at the bottom of the dust removal duct to drain water collected in the duct. The ventilating fan is provided at the downstream side of the sub filter. The treatment tank contains a processing medium comprising a mixture of microorganisms for decomposing organic refuse, and organic refuse.    DESCRIPTION OF DRAWING(S) - The figure shows a sectional view of the deodorizing unit annexed to the organic refuse disposer.    deodorizing unit (2)    intermediate duct (62,67)    dust removal duct (63)    inlet end (63a)    outlet end (63b)    main filter (64)    sub filter (65)    ventilation fan (66)