Removal of Sulphide

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Hello everyone I want to know, howto remove Hydrogen sulphide from the Brackish water using in the RO system?

1 Answer

  1. Hi Judith: Hydrogen sulphide is a gas and unfortunately RO memrbanes do not remove gases well. So RO treatment will not change the content of H2S in the desalinated brackish water. The most commonly used method for removal of H2S is by air stripping followed by oxidation of the remining sulfide. For efficent air strilloing the RO permeate pH should first be adjusted to a range of 5.5 to 5.8 (hypically with carbon dioxide sollution injection in the permeate) and than processed through packed tower (degasser). Often the H2S removed from the degasser has to be collected and treated in an air strippers (Scrubbers). Counter-current scrubiing of the gas with sodium hypochlorite or caustic soda is very commony used. We have H2S in most of our brackish ground waters in the US and practically all of these installations have air stripping packed tower for removal of the H2S gas from permeate followed by air stripping tower. In order for the brackish water permeate to be suitable for drinking purposes, the level of H2S in the water will need to be reduced down to 0.1 mg/L. Induced draft towers used for air stripping are usually made of plastic material and designed for liquid loading rate of 30 gallons per minute per square foot of tower diameter.