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

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...

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Bibliographic Details
Published in:Fisheries science 2022-09, Vol.88 (5), p.609-616
Main Authors: Yamamoto, Tamiji, Nakajima, Tomohiro, Asaoka, Satoshi
Format: Article
Language:English
Subjects:
Adsorption
Benthos
Biomedical and Life Sciences
Calcium carbonate
Decay
Depletion
Fish & Wildlife Biology & Management
Food Science
Freshwater & Marine Ecology
Hydrogen
Hydrogen sulfide
Hydrogen sulphide
Life Sciences
Marine molluscs
Original Article
Oxidation
Oxygen depletion
Oysters
Roasting
Sediment
Sediments
Shells
Sulfur
Sulphides
Sulphur
Temperature
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Summary: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, CaCO 3 , 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 m 2 /g at 100–500 ℃. In contrast, the area decreased to 0.36 m 2 /g at 600 ℃ and further to 0.21 m 2 /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.
ISSN:0919-9268
1444-2906
DOI:10.1007/s12562-022-01620-2