ごみ焼却場灰汚水貯留槽における硫化水素の発生機構に関する研究

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An accident by inhalation occurred in the storage tank of quenching water for hot ash and five workers were killed in the municipal solid waste incineration plant of H city. It was clarified that a large amount of H2S, accumulated in the sediment, was momentally released into the space of the ash water tank, when the water stirred, as reported before. In this paper, the balance of sulfur in the quenching water treatment system was considered using data from the operation of this system. Also, the change of sulfur compounds in the ash water and the factors of water quality were experimentally investigated. The results obtained are as follows.1) As the operation of ash water treatment system was not regular when the accident broke out, it seems that the particles of ash in the water were apt to precipitate to the bottom of the storage tank and pipes within a short time.2) It was confirmed that the values of pH and ORP in the ash water in the storage tank were kept in a condition favorable to anaerobic decomposition of the sludge, so that the conversion from sulfates to H2S in the water and the sludge occurred easily, and the converted H2S was stored in the precipitating sludge.3) It was estimated that the content of sulfur in the ash water depends on the amount of sulfur compounds in the burned solid waste, oil and aluminium sulfate added to the ash water.4) It was clarified that the generation of H2S from water in the storage tank decreases temporarily with the addition of aluminum sulfate, which coagulates the suspended particles in the ash water. However, the generation of H2S increased explosively with a lapse of time, because the factors of water quality, such as pH, ORP, etc, transfer gradually to the reduction side.5) It was confirmed that the amount of H2S, accumulating in the sludge, depends on the length of the stagnant period of ash water in the flowing process.6) A preventive and control plan to H2S generation in the continuous flowing system of the quenching water in this plant was considered.
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ごみ焼却場灰汚水貯留槽における硫化水素の発生機構に関する研究

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