Valorization Of Inorganic Solid Wastes From Industrial Activities Into Active Materials For Removal Of Hydrogen Sulfide In Gas Phase
Hoạt hóa chất thải rắn vô cơ từ hoạt động công nghiệp tạo thành vật liệu loại bỏ Hydro Sunfua ở pha khí
Résumé
Hydrogen sulfide (H2S), which was formed from both natural and anthropogenic processes, is one of the most toxic contaminants affecting machine, people health, and ecosystem. Activated carbon and its derivatives (with metal oxides) are conventionally for H2S removal. However, they are expensive. Besides, the worldwide production of soda ash bases mostly on the Solvay Process® (59% in 2000), which generates a large amounts of inorganic solid wastes with the main composition of CaCO3. This study aims to investigate the use of this calcified solid wastes from the Solvay Process® for removal of H2S in gas phase in order to limit the environmental impacts and enhance the economic benefits. The solid wastes, after some pretreatments, were tested for the removal of H2S in a glass fixed-bed reactor at ambient condition. Different parameters such as the influence of the calcination, contact time, iron-doping were investigated. Physico-chemical characterizations by TG-DSC, SEM-EDX were applied. Results showed that these solid wastes are promising for H2S treatment. The presence of inorganic impurities played an important role. The pretreatment by calcination and modification by iron-doping strongly improved the reactivity of the initial sorbents. The sorption of H2S on calcified sorbent was partially reversible.
Domaines
Génie des procédés
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