The rose Bengal was taken as indicative dye, and a strain of decolorizing bacteria was selected from soil microorganism by method of decolorizing transparent circle. The strain was tentatively identified as Aspergillus niger, and its decolorizing ability was tentatively detected. The results indicated that this strain of Aspergillus niger has strong adaptability and dye-deeolorizing ability. The method of decolorizing transparent circle is a simple, convenient and effective method to isolate the dye-dec...