A kind of composite soil remediation agent and its preparation method and application
A soil remediation agent and reaction technology, which is applied in the restoration, application, and soil conditioning materials of polluted soil, and can solve the problems of unstable and poor remediation effect of single activated carbon/biochar
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preparation example Construction
[0078] The embodiments of this group provide a preparation method of a soil remediation agent, which is characterized in that, comprising the following steps:
[0079] S1, montmorillonite, magnesium chloride, ferrous oxalate are dispersed into water respectively, obtain the dispersion liquid of montmorillonite, the dispersion liquid of magnesium chloride, the dispersion liquid of ferrous oxalate;
[0080] S2, join cetyl trimethyl ammonium bromide, ammoniacal liquor in described montmorillonite dispersion liquid to react, obtain the first step dispersion liquid; Add described magnesium chloride dispersion liquid and ferrous oxalate dispersion liquid to described montmorillonite dispersion liquid The first step is to react in the dispersion to obtain the second step dispersion;
[0081] S3, washing, drying and calcining the dispersion liquid in the second step after hydrothermal treatment to obtain magnesium / iron-montmorillonite.
[0082] Also includes: S4, mixing the magnesium...
experiment example 1
[0100] A kind of method of utilizing magnesium / iron-montmorillonite and biochar composite material of the present invention to repair composite heavy metal polluted soil comprises the following steps:
[0101] (1) Preparation of compound heavy metal-contaminated soil: The test soil was collected from farmland in Yuelu District, Changsha, Hunan. The compound heavy metal-contaminated soil was prepared by artificially adding zinc, copper, lead, and cadmium solutions, and the compound heavy metal-contaminated soil was incubated at a constant temperature of 25°C. Two months, so that the form of heavy metals tends to be stable. The contents of total zinc, copper, lead and cadmium in the soil measured by graphite furnace digestion method are 650-840mg / kg, 150-170mg / kg, 750-800mg / kg, 3.4-3.8mg / kg respectively. Soil remediation experiments were then carried out.
[0102] (2) Remediation of compound heavy metal contaminated soil: prepare five groups of compound heavy metal contaminated...
experiment example 2
[0107] Research on physical and chemical properties of soil remediation by composite remediation agent:
[0108] Prepare five groups of compound heavy metal-contaminated soil after embodiment (1) stabilization of the same weight, wherein, the first group does not add any restorative agent, as blank control group (CK); The second group adds 3% of compound heavy metal-contaminated soil weight Composite soil remediation agent (magnesium / iron-montmorillonite: biochar=0:10) (M0H10); in the third group, add the composite soil remediation agent (magnesium / iron-montmorillonite: Biological charcoal=1:9) (M1H9), uniformly mixed; In the fourth group, add composite soil remediation agent (magnesium / iron-montmorillonite: biochar=3:7) (M3H7) of compound heavy metal polluted soil weight 3% , uniformly mixed; in the fifth group, add composite soil remediation agent (magnesium / iron-montmorillonite: biochar=4:6) (M4H6) of composite heavy metal polluted soil weight 3% in the fifth group, uniform...
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