Technology Type

Spent Caustic is considered to be one of the Liquid Industrial Wastes that are not easy to handle and to dispose of, due to its high Content of Pollutants, Alkalinity (pH > 12), high Salinity (sodium of 5-12 wt%) and high Sulfide concentration (2-3 wt%). The composition of Spent Caustic Streams is highly variable and can be categorised into three groups, depending on origin and composition in the groups of Sulphidic, Cresylic and Napthenic. There are some Methods for Treatment of Spent Caustic including following list :

1. Neutralization with Sulfuric Acid
2. Injection in Deep Wells
3. Coagulation and Flocculation
4. Wet Air Oxidation
5. Catalytic Oxidation
6. Advanced Oxidation
7. Biological Method
8. Physical Method.