Abstract
Neither acetate nor higher fatty acids and glucose have a significant effect on the biotechnological process for sulphide removal at 20 degrees C, in which sulphide is oxidized to sulphur using oxygen. The oxidation of acetate and propionate with oxygen is mainly dependent on the sulphide and oxygen concentrations in the reactor. The occurrence of Thiothrix filaments in sulphide-removing waste-water treatment systems has been investigated using a fixer-film upflow reactor. The influent of this reactor consisted of anaerobically treated paper-mill waste-water, with a sulphide concentration of 140 mg/l. It was found that sulphide loading rate is the decisive parameter as to whether or not Thiothrix will develop in a sulphide-removing reactor.
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