|Several bacteria from the ambient surroundingｓ were examined for biological removal of hydrogen sulifide. Dry pig feces was shown to be a good source of the bacteria removing hydrogen sulfide. The bacteria were cultivated in the presence of hydrogen sulfide, and then the capability of removing hydrogen sulfide was examined with apparatuses of aerating process and scrubber process. At higher flow rate, the removal efficiency decreased. The gas-liquid contact time was supposed to be the main reason of the low efficiency. In the aerating process, long time operation resulted in the decrease in the removal efficiency with the decrease in the amount of bacteria. Addition of nutrient recovered the efficiency as well as the amount of living bacteria. Thus, the bacteria removing hydrogen sulfide ware heterotrophic.