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Changes in physical and chemical characteristics and reactivity to hydrogen sulfide of calcined oyster shells

Abstract

Hiroshima Bay contains the largest cultured oyster production area in Japan. Oyster feces causes deterioration of sediment quality and decay of the benthic ecosystem by generation of hydrogen sulfide and oxygen depletion. The main aim of this study is to utilize oyster shells effectively to suppress the hydrogen sulfide generation in the sediments. The main component of oyster shells, CaCO3, was transformed to CaO at calcination temperatures higher than 500 °C. The specific surface area of the shell did not increase with elevated calcination temperature, but remained at an average of 0.69 m2/g at 100–500 ℃. In contrast, the area decreased to 0.36 m2/g at 600 ℃ and further to 0.21 m2/g at 700 ℃. Adsorption of hydrogen sulfide by the calcined oyster shells increased from 1.7 mg S/g without calcination to 3.3 mg S/g at 400 ℃. A budgeting calculation of sulfur revealed that adsorption was the main process for hydrogen sulfide removal, while oxidation was subordinate. It is concluded that oyster shells calcined with temperature at 400 ℃ is most effective for remediation of deteriorated sediments by adsorbing hydrogen sulfide. Using such a by-product would also create a recycle oriented society.

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Acknowledgements

We are grateful to the following three professors: Dr. Kazuhiko Takeda, Graduate School of Biosphere Science; Dr. Takayuki Ichikawa, Natural Science Center for Basic Research and Development, and Dr. Shinjiro Hayakawa, graduate school of engineering, Hiroshima University, for providing us with the measuring devices, DX-120, TG-DTA TG8120, and XAFS at HiSOR, respectively, and their help and valuable suggestions during the experiments. We are also grateful to our research assistant, Dr. Kyung-Hoi Kim, graduate school of biosphere science, for his help during the experiments. This research was carried out using the general school operation support funds supplied by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.

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Correspondence to Tamiji Yamamoto or Satoshi Asaoka.

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Yamamoto, T., Nakajima, T. & Asaoka, S. Changes in physical and chemical characteristics and reactivity to hydrogen sulfide of calcined oyster shells. Fish Sci 88, 609–616 (2022). https://doi.org/10.1007/s12562-022-01620-2

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  • DOI: https://doi.org/10.1007/s12562-022-01620-2

Keywords

  • Adsorption
  • Eutrophication
  • Hydrogen sulfide
  • Oyster shell
  • Recycle
  • Restoration
  • SDG
  • Sediment