Shogo Sakita

Research Field

Lead (geology)

10.11532/proes1992.41.459

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Citations (3)

Solidification and Immobilization of Heavy metals in Soil using with nano-metallic Ca/CaO Dispersion Mixture

E3S Web of Conferences (2013)

Srinivasa Reddy Mallampati Yoshiharu Mitoma Tetsuji Okuda Shogo Sakita Mitsunori Kakeda

In the present work, the use of nano-metallic calcium (Ca) and calcium oxide (CaO) dispersion mixture for the immobilization of heavy metals (As, Cd, Cr and Pb) in soil was investigated. With simple grinding, 85-90% of heavy metals immobilization could be achieved, while it could be enhanced to 98-100% by grinding with the addition of nano-metallic Ca/CaO dispersion mixture. By SEM-EDS elemental maps as well as semi-quantitative analysis observed that the amount of As, Cd, Cr and Pb measurable on soil particle surface decreases after nano-metallic Ca/CaO treatment. The leachable heavy metals concentrations were reduced, to the concentration lower than the Japan soil elution standard regulatory threshold, i. e., < 0.01 mg/l for As, Cd and Pb and 0.05mg/l for Cr. Whereas, the effect of soil moisture and pH on heavy metals immobilization was not much influenced. The results suggest that nano-metallic Ca/CaO mixture is suitable to be used for the gentle immobilization of heavy metals contaminated soil at normal moisture conditions.

10.1051/e3sconf/20130135002

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Citations (6)

Extraction and immobilization of radioactive cesium from contaminated fly ash with nano-metallic Ca/CaO methanol suspension

Srinivasa Reddy Mallampati Yoshiharu Mitoma Shogo Sakita

Suspension

Caesium

Human decontamination

Source

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Citations (0)

Novel Approach for the Remediation of Radioactive Cesium Contaminated Soil with nano-Fe/Ca/CaO Dispersion Mixture in Dry Condition

E3S Web of Conferences (2013)

Srinivasa Reddy Mallampati Yoshiharu Mitoma Tetsuji Okuda Shogo Sakita Mitsunori Kakeda

Present study, first time we developed a nano-Fe/Ca/CaO dispersion mixture based remediation and volume reduction method of real radioactive cesium contaminated soils. After soil samples treated with 10wt% of nano-Fe/Ca/CaO dispersion mixtures, emitting radiation intensity was reduced from 4.00 μSv/h to 0.95 μSv/h in non-magnetic fraction soils. While, after treatment, about 30wt% magnetic and 70wt% nonmagnetic fraction soils were separated, and it’s condensed radioactive cesium concentration was about 80% and 20%, respectively. By this way, cesium contaminated soil volume can be reduced. These preliminary results appear to be very promising and the simple mixing with the addition of nano-Fe/Ca/CaO may be considered potentially applicable for the remediation and separation of radioactive Cs contaminated soil in dry conditions.

Caesium

Human decontamination

Fraction (chemistry)

Magnetic separation

10.1051/e3sconf/20130108003

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Citations (1)

Vertical Advection between Surface Water and Sediment by Tide

Environmental Engineering Research (2003)

Shogo Sakita Koji Kubo Ayako Hashimoto Tetsuya Kusuda

10.11532/proes1992.40.579

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