Dye Catalyzed Oxidation of Industrial Wastes

by Jerome W. Sargent, San. Engr.; Dept. of Environmental Conservation, State of Alaska, Juneau, Alaska,
Robert L. Sanks, (F.ASCE), Prof. of Civ. Engrg. and Engrg. Mechanics; Montana State Univ., Bozeman, Mont.,


Serial Information: Journal of the Environmental Engineering Division, 1976, Vol. 102, Issue 5, Pg. 879-895


Document Type: Journal Paper

Abstract: Dye sensitized aerobic photooxidation is a photochemical process by which a sensitizer dye absorbs visible light energy and transfers it to dissolved oxygen to form singlet oxygen. Singlet oxygen is a strong oxidizing agent capable of oxidizing refractory organics such as cresol and phenol. The oxidation products are likely to be easily oxidized biologically. With sunlight as the light source, only oxygen and energy for aeration are consumed. Methylene blue and Rose Bengal are effective sensitizers for aerobic photooxidation of phenol and cresol. Minimum cresol half-life is 2.45 min with methylene blue and 2.74 min with Rose Bengal. Phenol half-life is 6.9 min with methylene blue and 7.5 min with Rose Bengal. For the technologic and economic feasibility of dye sensitized aerobic photooxidation applied to waste treatment to be assessed, the process must be tested with sunlight and actual waste streams, and a method by which dye can be applied and recovered for reuse must be found.

Subject Headings: Dyes | Aerobic processes | Light (natural) | Phenol | Waste treatment | Dissolved oxygen | Oxygen transfer

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