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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

Active Publication Date: 2017-12-12
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 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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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, which can be applied to urban sludge treatment, polluted construction land, industrial and mining abandoned ) Restoration of wetland soil and wetland parks. Background technique [0002] With the development of the economy and the advancement 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 kind of inorganic-organic compound pollution of soil The area is gradually expanding and getting worse year by year. [0003] According to the "National Soil Pollution Survey Bulletin" published by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, the environmental quality of cultivated...

Claims

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Application Information

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Patent Type & Authority Applications(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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