Washing Methods for Remove Sodium Chloride from Oyster Shell Waste: A Comparative Study

Jung Eun Park, Sang Eun Lee and Seokhwi Kim ()
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Jung Eun Park: Center for Bio Resource Recycling, Institute for Advanced Engineering, Yongin-si 17180, Republic of Korea
Sang Eun Lee: Center for Bio Resource Recycling, Institute for Advanced Engineering, Yongin-si 17180, Republic of Korea
Seokhwi Kim: Center for Bio Resource Recycling, Institute for Advanced Engineering, Yongin-si 17180, Republic of Korea

Waste, 2023, vol. 1, issue 1, 1-10

Abstract: The oyster shell is a valuable calcium resource; however, its application is limited by its high NaCl content. Therefore, to establish the use of oyster shells as a viable resource, conditional experiments were conducted to select optimum parameters for NaCl removal. For this purpose, we compared leaching methods with batch and sequential procedures, determined the volume of water used for washing, and evaluated the mixing speed. The batch system removed NaCl when washed for >24 h over a shell to water ratio of 1:5. Results from the batch experiments confirmed that washing twice can completely remove NaCl from the shells on a like-for-like basis. Additionally, the efficiency of washing was sequentially evaluated in terms of the number of washing cycles. Compared to batch experiments, continuous washing could remove NaCl in approximately 10 min at a shell to water ratio of 1:4. We found that regardless of the washing methods, the volume of water used for washing is key for enhancing NaCl removal. Consequently, increasing the volume of water used for washing coupled with a proper sorting of fine particles can help enhance the purity of calcium, which will enable the use of oyster shell as an alternate Ca-resource.

Keywords: oyster shell waste; washing method; sodium chloride; impurities; particle size (search for similar items in EconPapers)
JEL-codes: Q1 Q16 Q18 Q2 Q20 Q23 Q24 Q25 Q28 Q3 Q31 Q38 Q5 (search for similar items in EconPapers)
Date: 2023
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