Insolubilization material and insolubilization method
A compound, calcium chloride technology, applied in chemical instruments and methods, soil conditioning materials, other chemical processes, etc.
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Embodiment 1-1
[0076] First, the effect of insolubilization on low concentration fluorine-contaminated soil was confirmed. Prepare soil that is dried to constant volume with a dryer at 40°C. Then, fluorine was added to the above-mentioned soil, and the elution amount of fluorine became 6.0 mg / L, and the simulated contaminated soil was prepared.
[0077] Add water to 1 kg of the aforementioned simulated polluted soil, and adjust its water content to 40%. 15.1 mmol of DAP in terms of phosphate ion conversion and 7.56 mmol of hemihydrate gypsum in conversion of calcium ion were provided to the soil whose water content ratio was adjusted, and these were mixed for insolubilization treatment. For the obtained treated product, the eluted amount of fluorine was calculated, and the effect of insolubilization was evaluated. The results are shown in Table 1.
[0078]
[0079] The water content ratio w (%) was calculated based on the following formula in accordance with JIS A1203 (test method for w...
Embodiment 1-2～1-5、 comparative example 1-1
[0092] As described in Table 1, except that the amount of calcium ions was changed, the eluted fluorine amount was calculated and evaluated in the same manner as in Example 1-1. The results are shown in Table 1.
[0093] [Table 1]
[0094]
[0095] As shown in Table 1, the insolubilization methods of Examples 1-1 to 1-5 can reduce the eluted amount of fluorine. That is, it was confirmed that the insolubilization effect of fluorine was present in the contaminated soil with a relatively low concentration of 6.0 mg / L fluorine leached by the insolubilization methods of Examples 1-1 to 1-5. In particular, it was confirmed that by setting the amount of calcium ions to 0.8 mol or more relative to 1 mol of phosphate ions, the eluted amount of fluorine was reduced to one-third or less. In addition, by setting the amount of calcium ions to 1 mol or more relative to 1 mol of phosphate ions, the amount of leached fluorine can be reduced to 0.8 mg / day, which is the leached amount of f...
Embodiment 2-1
[0097] Next, the effect of insolubilization on soil contaminated with fluorine at a relatively high concentration was confirmed. The leaching amount of fluorine in simulated polluted soil was set at 100 mg / L, and 7.56 mmol of DAP in terms of phosphate ion conversion and 6.05 mmol of hemihydrate gypsum in conversion of calcium ion were given to the soil with adjusted water content. Other than that, insolubilization treatment was performed in the same manner as in Example 1-1. For the obtained treated product, the eluted amount of fluorine was calculated, and the effect of insolubilization was evaluated. However, the effect of insolubilization was evaluated based on the following criteria. The results are shown in Table 2.
[0098] ◎(Extremely good): Fluorine elution is below 2.0mg / L
[0099] ○ (good): Fluorine elution exceeds 2.0 mg / L and is 5.0 mg / L or less
[0100] △ (slightly good): Fluorine leaching exceeds 5.0 mg / L and 15.0 mg / L or less
[0101] × (poor): Fluorine lea...
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