Description

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 ± *0% efficiency and uses a caustic-only scrub at high pH (± *2.5). 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 *9%+ 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 ***6, Q-PAC® offers a number of advantages when designing an odour control wet scrubbing system: