Study of the catalytic iron oxidation of hydrogen sulfide by air oxygen in a reactor with a membrane separator

Summary

The results of studies of the catalytic iron oxidation of hydrogen sulfide by air oxygen in a reactor with a membrane separator are presented. The studies were carried out in a laboratory setup. An artificially prepared model hydrogen sulfide-containing water served as the object of study. The laboratory setup was a reactor vessel where hydrogen sulfide was oxidized by air oxygen in the presence of iron hydroxide that acted as a catalyst for the process. The separation of purified water and Fe (OH)₃ was carried out by ultrafiltration. All the experiments were executed under the conditions recommended for the iron catalytic oxidation of hydrogen sulfide: concentration of iron (III) hydroxide 2 g/dm₃, pH 7–8, residence time in the reactor 1 hour, air consumption 2 m³/m³, temperature 20–23 ºС. The oxidizing ability of the method has been experimentally confirmed at the above standard values of the indicators. A regression equation has been obtained that describes the catalytic oxidation of hydrogen sulfide by air oxygen in a reactor with a membrane separator. The presented method can be recommended in the process flow schemes of natural hydrogen sulfide-containing water purification for the purposes of drinking water supply.

Key words

ultrafiltration , sulfide-alkaline wastewater , hydrogen sulfide , membrane separation , air oxygen , iron hydroxide