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IN-SITU REMEDIATION METHOD OF HEAVY METAL-CONTAMINATED SOIL USING LIQUID PHOSPHATE
IN-SITU REMEDIATION METHOD OF HEAVY METAL-CONTAMINATED SOIL USING LIQUID PHOSPHATE
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机译：液态磷酸盐原位修复重金属污染土壤的方法
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摘要
PURPOSE: A remediation method of heavy metal-contaminated soil is provided which enables remediation of the heavy metal-contaminated soil more inexpensively and efficiently by using liquid phosphate without separate drilling or transferring of soil. CONSTITUTION: The method comprises the step of insolubilizing excess phosphoric acid ions by injecting an alkaline aqueous solution into the stabilized insoluble metal phosphate after stabilizing heavy metals in the soil into insoluble metal phosphate by injecting an acidic phosphate aqueous solution into soil contaminated by heavy metals, wherein the phosphate aqueous solution is any one solution selected from the group consisting of potassium phosphate (KH2PO4) aqueous solution, CaH4(PO4)2CaHPO4H3PO4CaSO42H2O aqueous solution, sodium dihydrogen phosphate (Na2H2PO4) aqueous solution and a mixed solution thereof, wherein the acidic phosphate aqueous solution has pH range of 1 to 1.5, and wherein the alkaline aqueous solution contains alkaline cations consisting of Ca¬2+, Mg¬2+, Fe¬3+ and Al¬3+.
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