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This article provides a brief overview and characteristics of recycled and waste water of oil refineries, methods of their purification and disinfection. Chemical and biochemical processes involving sulfur and its compounds occurring in oil refining recycling systems were studied for further development of engineering solutions for water quality stabilization. It is established that elemental sulfur is the main starting material for the formation of sulfuric acid in the recycling system, which is the cause of an emergency. It is shown that the oxidation of elemental sulfur to sulfuric acid can occur both by chemical means and by means of microorganisms that oxidize sulfur.
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