Organic sulfur reduction in wastewater

A process comprising contacting a fluid containing an organic sulfur compound with an oxidizing agent to produce a pretreated fluid and contacting the pretreated fluid with an biologically active solid wherein

• said oxidizing agent is capable of converting said organic sulfur compound to a sulfoxide, a sulfone, or combinations thereof;
• said oxidizing agents is selected from the group consisting of hydrogen peroxide, a hydrogen peroxide-generating compound, peracetic acid, an oxide of nitrogen, sodium peroxide, an organic peroxide, chlorine dioxide, a halobenzoic, an alkali metal bromate or alkaline earth metal bromate, t-butyl peroxide, hypochlorous acid, an alkali metal hypochlorite, chlorine, peroxy carbonate, an alkali metal perborate, an alkali metal persulfate, an alkali metal permanganate, and combinations of two or more thereof;
• said biologically active solid is activated sludge;
• and
• said organic sulfur compound is selected from the group consisting of 2, 2′-thiodiethanol, 1,4-dithiane, 1,4-thioxane, thiophenol, sodium thiophenolate, 4-chlorothiophenol, and combinations of two or more thereof.