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A method for repairing heavy metal and (or) organic hydrocarbon contaminated soil

A technology of polluted soil and remediation method, applied in the field of remediation of heavy metal and/or organic hydrocarbon polluted soil, to achieve the effects of improving nutrient level, improving air permeability and light capture rate, and reducing diffusion resistance

Active Publication Date: 2019-03-22
蓝畅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is to provide a chemical remediation method for soil contaminated by heavy metals and (or) organic hydrocarbons. The adsorption matrix with a pore structure can be taken out after saturated adsorption of pollutants, and recycled after washing, drying, and roasting; the chemical repairing agent used in the washing process is biodegradable, avoiding the possible damage caused by conventional chemical repairing agents Soil secondary pollution problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Before contaminated soil remediation: The thickness of the contaminated soil is 0.75 m. The long-term use of chemical fertilizers has caused serious soil compaction and low nutrition. At the same time, the soil contains 543 ppm cadmium, 1082 ppm lead and 800 ppm chlorophenol, pH=5..1 , Can not 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 Weigh 0.5% of powder, 40% of high-viscosity clay, 0.5% of sesame powder, and 2% of kaolin by weight, mix thoroughly to obtain a mixture, add appropriate amount of water, fully stir and knead in a stirring tank, and roll into a certain amount The honeycomb sheet with a size of 2 m*1 m*0.15 m, cured for 1 day, dried in the shade, and fired in an air atmosphere at 300 ℃ for 10 hours to form a strength of 100 N / cm 2 Adsorption matrix ...

Embodiment 2

[0060] Before contaminated soil remediation: Originally abandoned land from chemical plants, the soil contained 12543 ppm cadmium, 3082 ppm lead, 20339 ppm chromium, 5049 ppm mercury and 3800 ppm anthracene.

[0061] Preparation of adsorption matrix with hierarchical pore structure: According to 13 X molecular sieve 15%, NaZSM-5 (molecular silicon-to-aluminum ratio 70) 10%, γ-cyclodextrin 30%, activated carbon 10%, diatomaceous earth 2%, ferrous sulfate 5%, nano-iron powder 5%, high-viscosity clay 20%, sesame powder 1%, kaolin 2% by weight, fully mixed to obtain a mixture, add appropriate amount of water, fully kneaded in a stirring tank, Rolled into a certain number of honeycomb flakes with a size of 5 m*2 m*0.25 m, cured for 1 day, dried in the shade, and fired in air at 650 ℃ for 4 hours to form a strength of 70 N / cm 2 Adsorption matrix with hierarchical pore structure.

[0062] Preparation of repair agent for leaching: Weigh each raw material group according to the weight perce...

Embodiment 3

[0065] Before remediation of contaminated soil: It was originally abandoned land by the lake. The soil contained 5206 ppm of cadmium, 1384 ppm of lead, and 2382 ppm of chromium, which did not meet the soil requirements for returning farmland to lakes.

[0066] Preparation of adsorption matrix with hierarchical pore structure: according to NaY molecular sieve (molecular silica-aluminum ratio 15) 20%, β-cyclodextrin 20%, coconut shell activated carbon 10%, diatomaceous earth 14%, ferrous sulfate 3%, nano-iron Weigh 1.5% of powder, 30% of high-viscosity clay, 0.5% of sesame powder, and 1% of kaolin by weight, mix well to obtain a mixture, add appropriate amount of water, fully kneaded in a stirring tank, and rolled into a certain amount The honeycomb sheet with a size of 3 m*2 m*0.35 m is cured for 1 day, dried in the shade, and fired in an air atmosphere at 550 ℃ for 4 hours to form a strength of 120 N / cm 2 Adsorption matrix with hierarchical pore structure.

[0067] Preparation of r...

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Abstract

The invention provides a restoration method for heavy metal and (or) organic hydrocarbon contaminated soil. The restoration method comprises the following steps of: (1) mixing a molecular sieve, cyclodextrin, activated carbon, diatomite, ferrous sulfate, enzyme slag, plant ash and active iron powder to obtain a mixture, adding clay to knead the mixture, and rolling the mixture into an adsorbing base body with a hierarchical pore structure, and embedding the adsorbing base body into contaminated soil; (2) preparing a restoration agent solution containing cyclodextrin, enzyme and potassium tripolyphosphate to leach the contaminated soil, and adsorbing and preserving; and (3) repeating the step (2) by many times. According to the restoration method provided by the invention, restoration agent solution leaching is combined with adsorbing of the base body with the hierarchical pore structure, so that heavy metal and (or) organic hydrocarbon substance pollutants in the soil are removed in a compounded mode, and therefore, the restoration method is suitable for municipal sludge treatment, and restoration for a contaminated building site, an industrial and mineral waste site, wetland soil obtained by returning farmland to lake (sea) and a wetland park, is simple and easy to operate, is free of secondary pollution, and can be used for industrial production.

Description

Technical field [0001] The invention belongs to the technical field of soil remediation, and specifically relates to a method for remediating soil contaminated by heavy metals and (or) organic hydrocarbons. It can be applied to urban sludge treatment, contaminated construction land, industrial and mining wasteland, and returning land to lakes (sea ) Treatment and restoration of wetland soil and wetland park. Background technique [0002] With the development of economy and the progress of urbanization, soil pollution has become a worldwide problem. Heavy metal pollution, pesticides and organic pollution coexist, resulting in a complex situation of inorganic-organic compound pollution, and this type of inorganic-organic compound pollution of soil The area is gradually expanding and getting worse year by year. [0003] According to the “National Survey Bulletin of Soil Pollution Status” published by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/08C09K17/40C09K109/00
CPCB09C1/00B09C1/08B09C2101/00C09K17/40C09K2109/00
Inventor 蓝畅
Owner 蓝畅
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