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Conversion of sulfate to hydrogen sulfide in the biological anaerobic wastewater treatment system results both toxic and odor problems. Our study utilize photosynthetic sulfur bacteria (PSB) as biocatalyst to remove sulfide from wastewater. Pyrex columns (diameter：1.2 cm) , light filters (red, colorless) and tungsten lamps (50-400 W/m²) were used for bench-scale study. According to the preliminary (Tang et al., 1987) and present experimental data, there are several conclusions can be obtained. (1) Sulfide removal rate is proportional to the illumination surface area. (2) Green sulfur bacteria (Chlorobium) is the dominant species in all reactors. (3) Adequate light filter may enhance the start-up process. (4) National effluent standard (total sulfide concentration less than I ppm) of the Republic China can be achieved under the following operational conditions.(i) Influent total sulfide concentration ≦ 200 ppm. (ii) surface loading rate ≦  1.0 g Ts⁼ /m²/D. (iii) Hydraulic retention time ≧ 0.5 day. (iv) Light intensity：500-1500 lux. (v) pH： 7.0-8.0.

Author：K.Y. Tang、M.J. Perng、T.C. Chang、G.D. Roam