The emission of hydrogen sulde (H2S) near the estuary of a regional river (Tokyo, Japan), which is thought to be caused
by biological reduction of sulfate in seawater mixing with overow wastewater, poses a severe environmental problem.
In order to investigate vertically the biochemical alteration of the river under the long-time treatment for the sulde
problem, we set up a vertical column simulator composed of articial sewage-lled columns and packed-bed columns.
During operation, we carried out chemical and biological analyses to elucidate vertical distributions of sulde concentration,
dissolved oxygen concentration, oxidation/reduction potential and microbial consortia. H2S was not detected in
the top section, which was supplied with continuous aerated articial wastewater, whereas H2S was formed at high concentrations
under anaerobic conditions. After 1 year, we changed the supply position for aerated sewage from the top to
the middle of the simulator; subsequently, the sulde concentrations in all sections, especially in the sediment region,
dropped to negligible levels. Furthermore, under each of these 2 conditions, pyrosequencing revealed that the microbial
consortia diered signicantly following the change of the aerated sewage supply position. On the basic of these results,
purging oxygen at the border of the water column and the sediment could help to solve the sulde problem more eectively
and might enhance the growth of bacteria involved in the sulde oxidation process.
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