| 英文摘要 |
Compiling the information regarding the specifications of recycled materials, the products of the recycling, and the wastes of the recycling suggests the options of soil treatment combinations.
Sintering processes use contaminated soils to partially replace some original materials. Arsenic used in the processes shows high risks of pollution spreading by leaching. Cadmium, chromium, copper, nickel, lead, and zinc can be fused with soil particles to form strong ceramic type materials when the sintering temperature is 1,050℃. Mercury is vaporized into air so post air pollution prevention equipment has to be in place.
400℃heat drying processes stabilize the soil containing arsenic, cadmium, copper, nickel, and zinc when the total concentrations are adjusted to be lower than the soil pollution concentration limits. Chromium-containing soils treated by the processes show high risk of leaching. Mercury processes need air pollution prevention equipment.
Concrete processes used with contaminated soils is not suitable for arsenic, chromium, lead, and mercury due to the increased risk of leaching. Cadmium, copper, nickel, and zinc can be stabilized by the processes.
Soil wash processes can be done for arsenic contaminated soils with higher soil to water ratio or using chelating agents like EDTA. Acid wash is good for cadmium, copper, and nickel. Chromium can be washed away with pre-heating processes and higher soil to water ratio. Lead can be washed with chelating agents. Zinc and mercury show poor removal rate by washing.
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