The Use of Scallop Shell Powder as a Method of Extracting Strontium
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The Use of Scallop Shell Powder as a Method of Extracting Strontium
Fumihiro Mihara1, Ken Takeuchi2, Sanae Tamura2, Yasushi Idemoto3 and Yasuo Kogo1 Faculty of Industrial Science and Technology, Tokyo University of Science, 6-3-1 Niijyuku, Katsushika, Tokyo, 125-0051, Japan, Tokyo University of Science, Katsushika, Tokyo, Japan. 2 Faculty of Industrial Science and Technology, Tokyo University of Science, 102-1 Tomino, Oshamambe, Hokkaido 049-3514, Japan. 3 Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, 278-8510, Japan. 1
ABSTRACT In Japan, scallop shells are considered to be industrial waste. Thus far, attempts for reusing these shells have been mainly limited to the commercial production of CaCO3. Nevertheless, there are no clear economic benefits associated with the use of scallop shells as a source of CaCO3. Hence, we are attempting to investigate a new value-added use for scallop shells as an advanced functional material. In this regard, we focused our attention on nuclear wastewater, which contains radioactive Sr and Cs. Sr, which tends to accumulate in bones, is believed to cause bone cancer. Hence, it is highly desirable to develop a method for removing Sr from contaminated water. In this study, we investigate whether scallop shells demonstrate the ability to remove Sr from a solution. From the results obtained, scallop shells can remove Sr solutes from a solution; furthermore, as compared to CaCO3, they demonstrate superior ability for removing Sr. INTRODUCTION The Japanese enjoy eating the ligament of scallops, with approximately 500,000 tons of scallops being consumed every year. Companies handling the processing of scallops dispose greater than 200,000 tons of scallop shells per year as industrial waste [1]. Moreover, huge piles of scallop shells are found along the roadside in Hokkaido, Japan. Hence, from the environmental viewpoint, the treatment of waste scallop shells is of significance, namely zero emissions, attributed to limitations of space for reclamation, as well as the bad odor emitted by them. The most desirable method for solving the aforementioned issues involves the utilization of their shells in industries. Scallop shells are used as raw materials for chalk, snow melting agents, and soil conditioners [2]. Thus far, attempts for reusing their shells have been mainly limited to the commercial production of CaCO3. Currently, almost all of the CaCO3 in Japan is produced from limestone, with the mining of 200 million tons of limestone each year in Japan [3]. CaCO3 produced from limestone is less expensive than that produced from scallop shells. Furthermore, there are no obvious economic benefits of using scallop shells as a source of CaCO3. Hence, scallop shells are not popular as a source of CaCO3. For effectively utilizing scallop shells, it is imperative to investigate their unique value, rather than using shells as a raw material for mere CaCO3. As shown in SEM image in Figure 1, specific fine columnar structures
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