Radioactive Waste (Method for Radiation Contaminated Soil, Pollution incineration ash, Pollution sludge)
Hojun started the Natural Blanket method (NB Method) using 100 % Bentonite to shut up the incineration ash more than 8,000 Becquerel's, cesium contamination such as sludge and Radiation contaminated soil
Natural blanket using high quality bentonite under 25mm of Particle size and Build an isolation layer that can compacted water-barrier layer to a thickness of 30 centimeters with permeability coefficient k ≦ 1.0 × 10-10m /sec when Maximum dry density 85%
|
| |
| The containment structure using bentonite for contaminated soil |
| |
| Features of the structure |
- Natural Blanket method using 100% pure crushed Bentonite and It's easy to set up
- Bentonite is natural mineral clay and safety. And will show the high-performance seepage control (Permeability coefficient under k≦1.0× 10-10m/sec) once compacting bentonite.
- Can construct using 4ton Vibration Roller /small Bulldozer
- Nothing diffusion into the groundwater by seepage control effect of bentonite
|
| |
| Usage Isolation layer of Bentonite |
- Shut out Landfill radioactivity waste
- Shut out Radioactive contamination rubble
- Shut out Schoolyard contaminated soil
- Radioactive waste buried buffer material
|
| |
| Natural Blanket specifications |
- 100 % Natural mineral Clay
High-Quality Clay
- 90% of passing through the Sieve with 26.5mm of particle size
|
The processing of radioactive cesium
Treat of disaster waster including Radioactive Cesium such kind of Cesium 134, 137 granted by the Ministry of the Environment on Jun 28, 2011. Also for the temporary storage granted on July 28, 2011.
On Aug 31, 2011 granted "Policy on disposal methods such as incineration ash between 8,000-100,000 Becquerel's per KG
According to Ministry of the Environment, Disposal of Ash should landfill the incineration ash after Which was solidified mixing with Cement or other materials for not easily collapse by installing an isolation layer
Prerequisite of Isolation layer is more than 30cm of thickness and lower than 1.0 × 10-6cm /sec of Permeability coefficient
|
| |
| Characteristic of Containment structure for Radioactive Cesium |
Our recommendation method of containment structure of Radioactive Cesium are below.
- Isolation Layer structured by Natural mineral bentonite (Natural Blanket) has good ability to adsorb the radiation cesium and that predominance granted by Disaster waste safety assessment review meeting organized by Ministry of International Trade and Industry. Also introduced Advantages isolation using bentonite by Clay Science Society of Japan (Basic Course)
- It's available reclaim wasted soil such kind of Radioactive Cesium compacted Natural Blanket by roller on top and bottom and this method using at Temporary Storage
- Natural Blanket can bury using 100 % Bentonite crushed stone easily
- Bentonite Ore is Natural mineral clay and has reputation safety. When rolling compaction will decrease Permeability coefficient lower than 1.0 × 10-10cm /sec and that ratio lower than Permeability coefficient recommended by the Ministry of the Environment
- Can construct using 4ton Vibration Roller /small Bulldozer
- Expected natural decay of radioactivity by seepage control effect of bentonite and can significantly delay the passage of radioactive cesium.
|
| |
| Recommended processing structure |
|
| |
| Usage Isolation layer of Bentonite |
- Reclaim radioactivity waste
- Reclaim radioactive contamination rubble
- Reclaim schoolyard contaminated soil
- Radioactive waste buried buffer material
|
| Natural Blanket specifications |
- 100 % Natural mineral Clay
High-Quality Clay
- 90% of passing through the Sieve with 26.5mm of particle size
|
|
