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Development of groundwater treatment method using radiation-induced graft polymerization adsorbent at the Mizunami Underground Research Laboratory; Annual report on 2007 fiscal year (Joint research)

Iyatomi, Yosuke ; Shimada, Akiomi; Ogata, Nobuhisa ; Sugihara, Kozo; Seko, Noriaki; Kasai, Noboru; Hoshina, Hiroyuki; Ueki, Yuji; Tamada, Masao

The concentrations of fluorine and boron dissolved in groundwater pumped from shafts during excavation at the Mizunami Underground Research Laboratory (MIU), Tono Geoscience Centre, are reduced to the levels below the environmental standards at a water treatment facility. Collaborative research on groundwater treatment for fluorine and boron has been started by the Environment and Industrial Materials Research Division, Quantum Beam Science Directorate and the Tono Geoscientific Research Unit, Geological Isolation Research and Development Directorate. This is because the Quantum Beam Science Directorate in JAEA has synthesized fibrous adsorbents with radiation-induced graft polymerization and applied them to collect rare metals dissolved in hot springs and sea water. Boron adsorbent synthesized by grafting showed higher removal rate than that of the ion-exchange resin. Additionally, the durability and the repetition use of the boron adsorbent were evaluated to estimate the performance of boron adsorption. Therefore we produced the test equipment to do scale-up test of the adsorbent. Effect of flow rate and the repetition use on the adsorption performance of boron was investigated. As a result, it concluded that adsorption performance did not change even when the flow rate increased from SV 50h$$^{-1}$$ to SV 100h$$^{-1}$$. In addition, enough durability was confirmed for the repetition use of the adsorbent. The adsorption performance of the adsorbent was affected by pH of the groundwater especially in alkaline region.

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