A method of soil restoration
A soil remediation and soil technology, applied in the field of soil remediation, can solve the problems of high remediation cost and complex treatment process.
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Embodiment 1
[0031] The preparation process of the composite barrier powder is as follows:
[0032] Step 1: Add 1kg of starch to 2L of water to make a starch solution;
[0033] Step 2: Add 150g of sodium periodate to the starch solution, raise the temperature to 50°C and stir for 1 hour, then add 50mL of ethylene glycol to remove unreacted sodium periodate, then wash with ethanol and dry to obtain oxidized ring-opened starch;
[0034] Step 3: Add 900g of the oxidized ring-opened starch prepared in step 2 into 31.5L of water and mix evenly, add 10.8kg of fly ash into it, stir and mix thoroughly for 30min, then raise the temperature to 60°C, and add 2.7 L thiourea solution, wherein the thiourea solution is prepared by dissolving each gram of thiourea in 8 mL of water, stirring vigorously while adding dropwise, keeping 8-9 mL dropwise per minute, and reacting at a constant temperature for 3 hours after the dropwise addition, and then filtering and washing. The obtained product is ground to ...
Embodiment 2
[0040] The preparation process of the composite barrier powder is as follows:
[0041] Step 1: Add 1kg of starch to 2L of water to make a starch solution;
[0042] Step 2: Add 160g of sodium periodate to the starch solution, raise the temperature to 50°C and stir for 1 hour, then add 50mL of ethylene glycol to remove unreacted sodium periodate, then wash with ethanol and dry to obtain oxidized ring-opened starch;
[0043] Step 3: Add 900g of the oxidized ring-opened starch prepared in step 2 into 31.5L of water and mix evenly, add 11.7kg of fly ash to it, stir and mix thoroughly for 30min, then raise the temperature to 60°C, and add 2.7kg of L thiourea solution, wherein the thiourea solution is prepared by dissolving each gram of thiourea in 8 mL of water, stirring vigorously while adding dropwise, keeping 8-9 mL dropwise per minute, and reacting at a constant temperature for 3 hours after the dropwise addition, and then filtering and washing. The obtained product is ground ...
Embodiment 3
[0049] A method for soil restoration, specifically comprising the following processes:
[0050] In the first step, the soil in the polluted area is scooped up to a depth of 60 cm, and at the same time, a layer of composite barrier powder prepared in Example 1 is laid in the scooped-up soil pit, wherein the laying thickness is 1-1.2 cm;
[0051] In the second step, the scooped-up polluted soil is evenly mixed with the modified cyclodextrin prepared in Example 1 to obtain the pre-treated polluted soil. In the polluted soil with a total heavy metal content of 0.5-2%, every kilogram of heavy metal polluted soil is added Modified cyclodextrin 11-13g;
[0052] The third step is to pour the pretreated contaminated soil into the pit where the composite barrier powder is laid, and then spray a certain amount of leaching agent on the surface of the pretreated contaminated soil. Post-leaching reaction for 10 days, then spraying for the third time, leaching reaction after spraying for 20...
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