SWS (Sour Water Stripping) consists of a fractionating tower which mainly removes hydrogen sulphide (H₂S) and ammonia (NH₃) along with some mercaptans, aromatics and also phenols from sour water before conveying it to the waste water treatment.

Sour water comes from many sources such as catalytic cracking units, hydrocrackers, flare seal drums, etc. Normally, refinery SWS are designed for a feed concentration in the range of 500 to 15000 ppmw of both NH₃ and H₂S. The molar ratio of NH₃ to H₂S is generally in the range of 0.75 to 2, and averages to about 1.2. The pH ranges commonly from 7 to 9.3.

We have also designed SWS with innovative process schemes in order to cut the technology edge of SWS.