Hideo Kamiyama

Removal of radiocobalt in waste water by activated charcoal using oxine as a chelating agent

Abstract The characteristics of the adsorption of Co ion in water on activated charcoal impregnated with oxine have been studied. Impregnation of oxine largely improved the adsorption capacity of activated charcoal (AC), although the apparent initial and final adsorption rates are not influenced. Another important advantage of AC impregnated with oxine [AC(HOx)] over plain AC is that Co ion collected on AC(HOx) is not easily eluted by flowing water. Furthermore the collection of Co on AC (Hox) is not affected by the presence of Fe(III), which exists in a macroscopic amount in waste water. At the initial adsorption stage, the apparent adsorption rate of Co ion on AC (HOx) is roughly proportional to 0.91 power of the concentration of Co ion.

Radiation-Induced Solid-State Polymerization in Binary Systems. III. Physical Properties of the Glassy Phase in Polymeric Systems

Abstract In order to obtain fundamental information for polymerization of some acrylic monomers in the glassy state, glass formation and the characteristics of multicomponent systems containing acrylic monomers were investigated. Glassy states were obtained by selecting the proper balance of three conditions: supercooling tendency of the mixtures, second-order transition temperatures, and cooling rate. Systems that form glasses at -78°C were classified into Type I (monomer as part of glass-forming matrix) and Type II (monomers dissolved in glass-forming matrix). All multicomponent systems containing acrylamide or acrylic acids form a glassy state at liquid nitrogen temperature. The phase diagrams of glassy systems of Type I show the formation of a molecular complex in the range of the glass-forming composition. Second-order transition temperatures were determined dilatometrically. Finally, the formation and structures of the supercooled state were identified by studying their infrared spectra.

Removal of Radiocobalt Ion in Waste Water by Oxine-Impregnated Activated Charcoal. Part II: Column Experiments

Cobalt ion in a flowing solution was adsorbed onto the oxine-impregnated activated charcoal in a column. The initial rate of adsorption, K A/sub m/, is influenced by either the flowrate or the ion concentration of a feed solution. The rate increases with a decrease in the concentration of the ion. However, with a solution of < 0.06 ..mu.. g ml/sup -1/ of the ion, the adsorption rate tends to be constant at 0.90 +- 0.06 min/sup -1/. A relation between feed application time and column depth (bed depth/service time) has been determined that qualitatively agrees with that obtained from a theoretical calculation. Feed application time for different concentrations and flowrates of feed solutions can be predicted by the bed depth/service time relation with a limited accuracy.

Adsorption and Desorption Properties of Radionuclides on Source Materials Used for Ground Migration Test.

In order to select an available inlet source material for a migration test of radionuclides in a sedimentary layer, 8 different materials; carbonated cement, coastal sand, chromosorb, sandstone, cation-exchange resin, zeolite, silica gel and Toyoura standard sand, were tested in terms of adsorption ability and leaching rate with time for 60Co, 85Sr and 137Cs. The adsorption terms of adsorption ability and leaching rate with time for 60Co, 85Sr and 137Cs. The adsorption abilities obtained as distribution coefficients (Kds) were tested by batch-type experiments, and the leaching rates were examined using column-type experiments. Among the materials, silica gel had the smallest Kd of approximately 60ml/g for the three radionuclides, and its Kd values did not fluctuate with time. Cement, sandstone and silica gel had a constant leaching rate for 60Co, 85Sr and 137Cs, ranging from 50 to 300ml inflow of groundwater. Approximately 70% of the three radionuclides were leached out from silica gel by 500ml inflow of groundwater. These results suggest that the silica gel is a suitable inlet source material for constantly supplying a solution with various radioactivities into a geologic layer.