Q-PAC® for H₂S Odour Control Scrubbers

The use of two stage scrubbing is often employed both to minimize chemical consumption as well as to control sulfur deposits when scrubbing H₂S. The first stage operates at ± 80% efficiency and uses a caustic-only scrub at high pH (± 12.5). The air then passes to the second stage, where the remaining H₂S is scrubbed with caustic / bleach solution at pH ± 9.5. The H₂S present is destroyed at 99%+ efficiency. The blow-down from the 2nd stage, which will contain some amount of unused NaOCl, is sent to the sump of the 1st stage. In this way, additional H₂S is destroyed and maximum consumption of expensive oxidising agent is assured.

Introduced to the industry in 1996, Q-PAC® offers a number of advantages when designing an odour control wet scrubbing system: