Restoration method for heavy metal and (or) organic hydrocarbon contaminated soil
A technology of contaminated soil and remediation method, applied in the field of remediation of heavy metal and (or) organic hydrocarbon contaminated soil, to achieve good remediation effect, increase adsorption capacity, improve air permeability and light harvesting rate
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Embodiment 1
[0055] Before remediation of contaminated soil: the thickness of the contaminated soil is 0.75 m. Due to the long-term use of chemical fertilizers, the soil is severely compacted and the nutrition is low. At the same time, the soil contains 543ppm cadmium, 1082ppm lead and 800ppm chlorinated phenol, pH=5..1, Cannot grow vegetables.
[0056] Preparation of adsorption matrix with hierarchical pore structure: according to 5A molecular sieve 10%, β-cyclodextrin 25%, activated carbon 10%, diatomaceous earth 5%, ferrous sulfate 1%, enzyme residue 3%, plant ash 3%, nano-iron 0.5% powder, 40% high-viscosity clay, 0.5% safflower powder, and 2% kaolin were weighed and mixed thoroughly to obtain a homogeneous product. Add appropriate amount of water, fully stir and knead in a stirring tank, and roll into a certain amount. Honeycomb flakes with a size of 2 m*1 m*0.15 m were cured for 1 day, dried naturally in the shade, and then baked at 300 °C for 10 hours in an air atmosphere to form a ...
Embodiment 2
[0060] Contaminated soil before remediation: It was originally abandoned land from a chemical plant, and the soil contained 12543 ppm cadmium, 3082 ppm lead, 20339 ppm chromium, 5049 ppm mercury and 3800 ppm anthracene substances.
[0061] Prepare the adsorption matrix with hierarchical porous structure: according to 13 X molecular sieve 15%, NaZSM-5 (molecular silicon aluminum ratio 70) 10%, γ-cyclodextrin 30%, activated carbon 10%, diatomaceous earth 2%, ferrous sulfate 5%, nano-iron powder 5%, high-viscosity clay 20%, safflower powder 1%, kaolin 2% by weight and weighed, fully mixed to obtain a blend, add an appropriate amount of water, fully stir and knead in a stirring tank, Rolled into a certain number of honeycomb sheets with a size of 5 m*2 m*0.25 m, cured for 1 day, dried naturally in the shade, and baked at 650 °C for 4 hours in an air atmosphere to form a honeycomb sheet with a strength of 70 N / cm 2 Adsorption matrix with hierarchical porous structure.
[0062] Pre...
Embodiment 3
[0065] Contaminated soil before remediation: The formerly abandoned land by the lake, the soil contained 5206 ppm cadmium, 1384 ppm lead, and 2382 ppm chromium, which did not meet the soil requirements for returning farmland to the lake.
[0066] Preparation of adsorption matrix with hierarchical porous structure: NaY molecular sieve (molecular silicon-aluminum ratio 15) 20%, β-cyclodextrin 20%, coconut shell activated carbon 10%, diatomaceous earth 14%, ferrous sulfate 3%, nano iron 1.5% powder, 30% high-viscosity clay, 0.5% safflower powder, and 1% kaolin were weighed by weight, mixed thoroughly to obtain a homogeneous product, added appropriate amount of water, fully stirred and kneaded in a stirring tank, and rolled into a certain amount Honeycomb flakes with a size of 3 m*2 m*0.35 m were cured for 1 day, dried naturally in the shade, and then baked at 550 °C for 4 hours in an air atmosphere to form a honeycomb sheet with a strength of 120 N / cm 2 Adsorption matrix with hie...
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