Evaluation of risk on hydrogen sulfide formation from recycled material and fine residue containing gypsum

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Possibility of hydrogen sulfide formation was investigated for construction and demolition waste sorting residue, fertilizer, soil conditioner, and recycled material containing sulfate or gypsum, assuming that they are utilized in ordinary environment. Long-term leaching behavior of sulfate from residue was almost the same with other materials. Though leached amount of organic carbon from residue was higher than from others, it was only 1% of its original content. Occurrence of sulfate reduction in residue was prevented by maintaining high pH.