Remediation material and remediation method for heavy metal contaminated soil
A technology of contaminated soil and remediation materials, applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of insignificant remediation effect, poor implementation effect and secondary pollution of heavy metal Cd pollution in soil , to achieve the effects of reducing bioavailability and mobility, increasing specific surface area, and reducing the harm to the ecological environment
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[0042] Example one:
[0043] A heavy metal contaminated soil remediation material, comprising modified clay minerals, calcium-magnesium-based composite materials, and magnesium oxide, in parts by weight: 20 parts of modified clay minerals, 30 parts of calcium-magnesium-based composite materials, and 5 parts of magnesium oxide.
[0044] The modified clay mineral is a modified zeolite, and the natural zeolite is modified by a thermal modification method. The natural zeolite can be calcium zeolite. The preparation method of the modified zeolite includes:
[0045] a1. Pretreatment, natural zeolite is naturally dried, crushed, and sieved through a 200-mesh sieve to obtain zeolite pretreatment products;
[0046] a2. Heat treatment: heat the pretreated zeolite at a temperature of 300-500°C and a heat treatment time of 3-5 hours; firstly, heat it up to about 380°C at a rate of 15°C / min and keep it at this temperature Continue for 3 hours, then increase the temperature to about 480°C at a temp...
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[0066] Embodiment two:
[0067] A heavy metal contaminated soil remediation material, including modified clay minerals, calcium-magnesium-based composite materials, and magnesium oxide, in parts by weight: 20-60 parts of modified clay minerals, 30-60 parts of calcium-magnesium-based composite materials, and magnesium oxide 5-10 parts, the weight of the microbial strain is 1-5 parts; the microbial strain can be selected from mixed strains of Bacillus, Corynebacterium, and Enterobacter.
[0068] The modified clay mineral is a modified zeolite, and the natural zeolite is modified by a thermal modification method. The natural zeolite can be a mixture of analcime, heulandite, and calcium zeolite. The preparation method of the modified zeolite includes:
[0069] a1. Pretreatment, natural zeolite is naturally dried, crushed, and sieved through a 200-mesh sieve to obtain zeolite pretreatment products;
[0070] a2. Heat treatment: heat the pretreated zeolite at a temperature of 300-500°C and a...
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