Medium-sulfur bacteria are used in bioremediation processes, particularly in the treatment of wastewater containing sulfides. These microorganisms oxidize sulfur compounds at moderate levels, helping to remove odorous and toxic hydrogen sulfide from industrial effluents. They are also applied in biofilters and biotrickling filters to maintain sulfur balance in environmental engineering systems. Their activity supports sustainable operations in wastewater treatment plants, pulp and paper industries, and natural gas processing by reducing sulfur pollution without requiring extreme temperature or pH conditions.