FIELD: treating sulfide-containing sewage; may be used as a part of process for treating sewage containing sulfates or sulfites. SUBSTANCE: sewage is admitted into reactor containing sulfide-oxidizing bacteria. The latter oxidize sulfides to elemental sulphur in presence of oxygen. At least portion of sulphur formed by oxidation is recovered from sewage and recycled back to reactor so as to maintain elemental sulphur concentration therein at level of at least 1 g/l. Sulphur in the form of large-size coalesced particles is used as carrier of sulfide-oxidizing bacteria. EFFECT: higher efficiency. 11 cl, 8 dwg
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