Heavy metal polluted soil composite repair agent and soil repair method thereof
A technology of complex restoration of polluted soil, applied in the field of soil restoration, can solve the problems of single biochar ash content, carbon content is not the same, only applicable, etc., to achieve the goal of reducing ecological risk, improving activity, and reducing the content of bioavailable state Effect
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[0028] Concrete, heavy metal polluted soil composite remediation agent, it is prepared by the following method:
[0029] A. Preparation of sludge biochar: After the sludge is heated under high temperature and vacuum, it is washed and dried to obtain sludge biochar;
[0030] B. Preparation of agricultural and forestry waste biochar: corn stalks are heated under high temperature and vacuum, washed and dried to obtain agricultural and forestry waste biochar;
[0031] C, mixing the sludge biochar obtained in step A with the agricultural and forestry waste biochar obtained in step B to obtain mixed biochar;
[0032] D. Mixing and reacting the mixed biochar obtained in step C with sodium citrate solution, after the reaction is completed, washing and drying to obtain a composite restoration agent for heavy metal polluted soil.
[0033] Due to its different ash content and carbon content, single biochar is generally only suitable for a specific contaminated soil, which has certain li...
Embodiment 1
[0047] Take the dewatered sludge from a certain urban sewage treatment plant, dry it in the sun until the water content does not exceed 15wt%, crush it with a pulverizer to obtain a powdery material, sieve the material with a 50-mesh standard sampling sieve, and remove the lower layer to seal The bag is ready for use; put the sludge powder in a muffle furnace for high-temperature vacuum heating, the heating time is 2 hours, and the heating temperature is 300°C. After the reaction, rinse with deionized water twice, dry at 105°C to constant weight, After the target standard sample sieve sieves the material, the under-sieve is the sludge biochar;
[0048] Take fresh corn stalks, soak them in clean water to wash off the surface sediment, and cut them into an area of about 1cm with scissors 2 The small pieces were washed twice with clean water and then washed twice with deionized water, dried at 105°C to constant weight, sieved with a 50-mesh standard sampling sieve and sealed fo...
Embodiment 2
[0052] Take the dewatered sludge from a certain urban sewage treatment plant, dry it in the sun until the water content does not exceed 15%, crush it with a pulverizer to obtain a powdery material, sieve the material with a 50-mesh standard sampling sieve, and remove the lower layer to seal The bag is ready for use; put the sludge powder in a muffle furnace for high-temperature vacuum heating, the heating time is 3 hours, and the heating temperature is 450°C. After the reaction, rinse twice with deionized water, dry at 105°C to constant weight, After the target standard sample sieve sieves the material, the under-sieve is the sludge biochar;
[0053] Take fresh corn stalks, soak them in clean water to wash off the surface sediment, and cut them into an area of about 1cm with scissors 2 The small pieces were washed twice with clean water and then washed twice with deionized water, dried at 105°C to constant weight, sieved with a 50-mesh standard sampling sieve and sealed for ...
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