Caustic solutions at varying strength are used in the Oil Refinery to clean the various vessels. The Spent Caustic generated contains a high amount of oil & grease, TSS, BOD, COD, sulphide, phenols, mercaptan, sodium thiosulphite, sodium carbonate, sulphates, ammonical nitrogen, TDS etc., and can cause potential damage to the Biological system in an Effluent Treatment plant if mixed with the other oily effluent.

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