フランセス・マリオンと女性脚本家の時代

Articledepartmental bulletin pape

セメント固化飛灰の比表面積が易溶解性物質の溶出量に及ぼす影響

The purpose of this study was to develop salt leaching control technology by solidifying fly ash with cement. Cylindrical specimens with different porosity were prepared to determine the parameters of the leaching model. Three cubic specimens with different size were prepared to clarify the relation between the specific surface area of the specimen and the leaching amount per specimen weight. Tank leaching tests were performed on these cylindrical and cubic specimens. As the porosity of specimen increased, the rate constants of surface dissolution were decreased, and the ratio of volume of specimen contributing to surface dissolution were increased. As the specific surface area was decreased, dimensionless cumulative leached amounts of Na, K and Cl were decreased, which means that leaching of salts from cement solidified fly ash could be controlled. In the non-depleted region, the actual leaching from cubic specimen was expressed by the proposed leaching model very well in both cases where the ratio of the maximum leaching amount per surface area was considered constant and where the depth contributing to surface dissolution was considered constant.departmental bulletin pape

Factors Influencing the Resource Separation Behavior by the Waste Bank System in Malang City, Indonesia

In 2011, a household resource recovery system from households was introduced in Malang city, Indonesia; this system was called Bank Sampah Malang (BSM). This system would contribute to the reduction of the volume of household waste carried to final disposal sites in the city. However, there are few studies on household resource recovery systems. In this study, a survey was conducted to obtain demographic information on the participants, their motivation for joining the BSM, and its inconvenience. It was found that reducing the number of categories of BSM resources could be an important strategy in reducing the burden of participating in the BSM.departmental bulletin pape

外部濃度がセメント固化の易溶解性物質溶出量に及ぼす影響

In this study, tank leaching tests were carried out for the purpose of clarifying the effect of external concentration on the leaching amount of easily soluble substances in cement solidified fly ash. Four solvents used were distilled water, solvent-1, solvent-5, and solvent-10.In the case of distilled water as solvent, the dimensionless leaching amount reached the maximum value at 0.125 day in all substances of Na, K, and Cl. Thereafter, the leaching amount increased from 0.25 day to 2 day, and decreased from 4 day. There was little leaching amount after 8 days. In addition, the leaching amounts from the cement solidified fly ash for all substances were suppressed when the external concentration was higher than solvent-5. The reason was considered that the difference between the external concentration and the concentration inside the cement solidified fly ash decreased with increase in external concentration, and it led the decrease in leaching rate of easily soluble substances from cement solidified fly ash.departmental bulletin pape

非降雨期間および周辺粒子粒径の固化飛灰からの易溶解性物質溶出量への影響

The purpose of this study was to clarify the effect of non-rainfall period and surrounding particle size on the leaching amount of easily soluble substances from cement solidified fly ash using a column experimental device. In the column tests, the dimensionless cumulative leachng amount of each element decreased with increase in non-rainfall period. As the particle size of the glass beads increased, the dimensionless cumulative leaching of any element decreased. The dimensionless cumulative leaching amount at a particle size of 2 mm diameter was almost the same as the leaching amount in the tank leaching test. It indicated that the same leaching amount as that from cement solidified fly ash immersed in water was leached even in the non-rain period.departmental bulletin pape

Two Cases of Endometrial Stromal Sarcoma which were Difficult to Differentiate from Hγsteromyoma

departmental bulletin pape

Process of Remaining at Their Workplace among Foreign Long-Term Care Workers in Japan

departmental bulletin pape

Environmental Safety Evaluation of Substrate Glass from Waste CIS Solar Panel Cells as Used Fine Aggregate

To evaluate the environmental safety of substrate glass (SG) from waste CIS solar panel cells as fine aggregate, JIS A 5011-1 leaching and content tests were conducted for aggregate samples and simulation samples made from SG, cement, water, coarse aggregate, and fine aggregate. In the simulation samples, SG was substituted for fine aggregate, ranging from 0 to 20% in volume. The effect of pH in leachate on selenium leaching from SG was also investigated. Although for aggregate samples, only the selenium leaching concentration exceeded the Environmentally Sound Quality Standards (ESQS) value for Leachate, for the simulation samples, selenium met the ESQS value for Leachate and Content under the 10% SG substitution rate. These results indicated that SG from the waste CIS solar panel cells used in this research could be environmentally-safely used as fine aggregate under the 10% SG substitution rate, considering the simulation sample evaluation. Furthermore, the SG substitution rate in weight which met the ESQS value for Leachate of selenium could be predicted using the leaching concentration for the aggregate sample. Although high pH increased selenium leaching from SG, the effect was small

Simultaneous Insolubilization of Cesium and Lead in Incineration Fly Ash Using Phosphoric Acid and Magnesium Solution

In order to obtain the knowledge on simultaneous insolubilization of cesium and lead in incineration fly ash using phosphoric acid and magnesium solution, the insolubilization experiments of cesium in aqueous solution by the addition of phosphoric acid and magnesium solution and leaching test of stabilized fly ash were conducted. pH less than 12 was necessary to insolubilize cesium as CsMgPO4 using phosphoric acid magnesium. It was necessary to add the amount of phosphorus in P/Cs of 1000 in a molar ratio to fly ash to reduce lead concentration in leachate to the landfill standard of 0.3mg/L or less. At P/Cs of 1000, Mg/Cs of 20, and addition rate of P and Mg solution of 40%, the dissolution rate of the cesium could be less than 20%. These results indicated that it was possible to simultaneously insolubilize of cesium and lead in incineration fly ash using phosphoric acid and magnesium solution.departmental bulletin pape

Insolubilization fo Lead in Incineration Fly Ash Using Phosphate and Magnesium Solution

In order to clarify the influence of the addition rate of phosphate and magnesium to fly ash on the lead elution concentration, phosphate compounds suitable for fly ash stabilization were investigated and fly ash stabilization was performed using the suitable phosphate and Mg solution. Both of phosphoric acid and NaH2PO4 satisfied the lead landfill standard at the phosphorus addition rate of 0.25 mol / kg. However, because phosphoric acid has a very low pH, NaH2PO4 was more suitable for fly ash stabilization. In addition, stabilization using phosphate and magnesium was able to lower the phosphorus addition rate to fly ash that satisfied the lead landfill standard, as compared with stabilization with only phosphate. This means that adding magnesium to fly ash could save the amount of phosphate required to insolubilize lead. The results of the availability test showed that lead dissolution rate using phosphate and magnesium was lower than that using a chelating agent.departmental bulletin pape