Safe solidification treatment technology for effectively utilizing construction-generated contaminated soil as construction materials: 'Solidification agent for naturally derived heavy metal contaminated soil using gypsum powder and scallop shells.'
Natural origin heavy metal contamination soil immobilization agent (RE) is an immobilization agent for naturally occurring heavy metal contaminated soil generated at construction sites such as tunnels, rivers, roads, and dams. It is a calcium-based immobilization agent primarily composed of scallop shells and gypsum powder. By adding this immobilization agent (soluble) to the contaminated soil, a reaction layer with a high concentration of calcium is formed on the surface of the soil particles (a site that promotes the immobilization reaction). This reaction layer efficiently immobilizes the heavy metals and suppresses their leaching from the contaminated soil particles.
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**Features of the New Technology** 1. **Economy** It has excellent economic efficiency with good reaction efficiency from a small amount of addition. 2. **Shortened Construction Period** It is effective immediately, with a short time to exhibit the solidification effect, eliminating the need for curing time, thus shortening the construction period. 3. **Workability** In powder form, it has excellent solubility and diffusibility, and the solidified treated soil has good workability without changes in properties such as solidification. Additionally, a variety of general-purpose machinery can be selected according to the properties of the contaminated soil. 4. **Diversity** It possesses both solidification and adsorption effects, allowing for the selection of various construction methods according to site conditions. 5. **Safety** The pH of the solidifying agent is neutral, and the treated soil maintains stability in the neutral range, which reduces the possibility of re-dissolution or alteration under natural environmental conditions in the future. 6. **Utilization** Since soil particles are coated with a reaction layer of calcium ions, it not only reacts with leached heavy metals but also has the effect of suppressing leaching. The contaminated soil after solidification can be effectively utilized as construction materials such as embankment materials. 7. **Environmental Consideration** The solidifying agent uses recycled materials, which helps reduce CO2 emissions during production.
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Applications/Examples of results
【Examples of Use】 ○ Solidification treatment of naturally occurring heavy metal contaminated soil due to tunnel construction ○ Solidification treatment of naturally occurring heavy metal contaminated soil from excavation residuals due to river construction ○ Solidification treatment of naturally occurring heavy metal contaminated soil due to building and apartment construction
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Our job is to measure and analyze the necessary environmental information to leave a comfortable environment for the next generation, which serves as the foundation for all social infrastructure development, and to provide appropriate advice. That is why diligent efforts based on the motto of "swift, reliable, and careful" are essential. Above all, being trusted is paramount. To achieve this, our company spares no effort in mastering new technologies and knowledge while fostering rich human qualities. ES Comprehensive Research Institute will advance with these four pillars: environmental management, geological surveys, design, and construction management. Moreover, as we continue to consider the Earth's environment in the 21st century, we are engaged in various research efforts to propose beneficial information as a comprehensive construction consultant. As a representative of this, we obtained a patent in November 2007 for "Soil Improvement Agents Containing Naturally Derived Heavy Metals and Methods for Producing Improved Soil," which is currently being used in various sites.
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