The present invention relates to a synthetic dye decomposing pleurotus ostreatus IUM 1873 strain or a synthetic dye removing composition containing the culture medium of the same as an active ingredient to provide a biological method for decomposing non-biodegradable dye wastewater. According to an embodiment of the present invention, pleurotus ostreatus IUM 1873 strain or a synthetic dye removing composition containing the culture medium of the same can be produced. [Reference numerals] (AA) Oyster mushrooms
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