A composite method for remediating soil heavy metal pollution
A technology for repairing soil and heavy metals, which is applied in the field of contaminated soil treatment. It can solve the problems of low heavy metal absorption efficiency, single heavy metal repairing elements, and long repairing time, and achieve the effect of improving soil physical and chemical properties, low planting difficulty, and good results.
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Embodiment 1
[0041] A compound method for remediating soil heavy metal pollution, comprising the following steps:
[0042] 1) In spring, apply urea and potassium dihydrogen phosphate to the heavy metal-contaminated soil as base fertilizer, and pour the heavy-metal-contaminated soil once and for all;
[0043] 2) The seeds of Chlorophytum were treated with 15% H 2 o 2 Disinfection treatment, then wash and soak in distilled water for 10 hours, cultivate Chlorophytum seeds with plump and non-sinking seeds at 20°C, and cover the seeds with 0.4cm of soil. After 8 days, select seedlings with 3 leaves and bury them at an angle of 28 degrees in the vertical direction. Step 1) The depth of the heavy metal-contaminated soil surface is 3cm thick, the plant-to-plant spacing is 15cm, and the row spacing is 20cm;
[0044] 3) Water according to the water shortage of the heavy metal polluted soil to keep the soil water content at 50%, and remove the Chlorophytum as a whole after 95 days;
[0045] 4) Bio...
Embodiment 2
[0055] A compound method for remediating soil heavy metal pollution, comprising the following steps:
[0056] 1) In spring, apply urea and potassium dihydrogen phosphate containing N, P, and K to the heavy metal-contaminated soil as a base fertilizer, and pour the heavy-metal-contaminated soil once and for all;
[0057] 2) Use cuttings to plant Chlorophytum, select seedlings with 4 leaves, and bury them at an inclination of 28 degrees. Step 1) The surface layer of heavy metal-contaminated soil is 5 cm thick, the plant spacing is 19 cm, and the row spacing is 24 cm;
[0058] 3) Water according to the water shortage of the heavy metal polluted soil to keep the soil water content at 56%, and remove the Chlorophytum as a whole after 91 days;
[0059] 4) Prepare biochar by using the waste of Chlorophytum Chlorophytum, mix the obtained biochar with dilute hydrochloric acid with a mass fraction of 10% and dilute nitric acid with a mass fraction of 5% at a volume ratio of 2:1, pickle ...
Embodiment 3
[0069] A compound method for remediating soil heavy metal pollution, comprising the following steps:
[0070] 1) In spring, apply urea and potassium dihydrogen phosphate containing N, P, and K to the heavy metal-contaminated soil as a base fertilizer, and pour the heavy-metal-contaminated soil once and for all;
[0071] 2) Spray Chlorophytum seeds with 20% H 2 o 2 Disinfection treatment, then wash and soak in distilled water for 12 hours, cultivate spider plant seeds with full grains and no sinking at 23°C, cover the seeds with 0.6cm of soil, after 11 days, select seedlings with 6 leaves, and bury them at a slope of 28 degrees at the same time 2) The depth of the surface layer of heavy metal polluted soil is 6cm thick, the distance between plants is 25cm, and the distance between rows is 28cm;
[0072] 3) Water according to the water shortage of the heavy metal-polluted soil to keep the soil water content at 56%, and remove the Chlorophytum as a whole after 91 days;
[0073...
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