Abstract
In recent years, the amount of waste gypsum board disposed of in managed landfill sites has been increasing, and the generation of H2S gas from waste gypsum board has become a problem even in this kind of landfill site.
As a countermeasure against H2S gas generation, we confirmed the effect of ventilation that makes a tank aerobic in our previous studies, but we had not investigated the effect of layer thickness. Moreover, it is difficult to sustain ventilation during and after disposal in landfill because of the cost. Therefore, we investigated whether it is possible to reduce the concentration of H2S by reducing the concentration of organic matter sources by improving the washout function through ventilation and the limitation of layer thickness. As a result, we confirmed that the landfill tank layer could be improved to an aerobic state by setting the layer thickness to about 1 m. However, even if the concentration of the organic matter source is low as a factor in H2S gas generation, generation will continue when the tank is anaerobic, and a certain concentration of sulfate remains.
