International Sugar Journal

Spent caustic recycle at Farleigh mill* [Full subscriber]

Abstract Caustic soda is routinely used in most Australian raw sugar factories to clean evaporator vessels and other process equipment. After repeated use, the caustic soda becomes fouled with both soluble and insoluble contaminants. The end result is the efficacy of the caustic soda is diminished and requires complete replacement. A low cost method for the disposal of spent caustic is required. Spent caustic soda is commonly disposed of, if possible, by trickling into the mill’s effluent to control pH levels in the effluent treatment plant. The other practical option available at present is removal and disposal by specialist waste…

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